WO2001030190A1

WO2001030190A1 - Inner shoe

Info

Publication number: WO2001030190A1
Application number: PCT/EP2000/010236
Authority: WO
Inventors: Stefan Yoon
Original assignee: W.L. Gore & Associates Gmbh
Priority date: 1999-10-26
Filing date: 2000-10-18
Publication date: 2001-05-03
Also published as: DE19951542C2; AU1273001A; DE19951542A1; PL354445A1; DE50007227D1; ES2225249T3; PL195281B1; ATE271793T1; EP1223823A1; EP1223823B1

Abstract

An inner shoe (10) for fixing in an outer shoe (20) comprises a watertight inner shoe material (15) and a sole region (12) with a sole outer surface (14) comprising a coating (30), which forms a combination with the inner shoe material (15). Said coating (30) is preferably in a vulcanised elastomer. The inventive inner shoe (10) is durably watertight.

Description

LINER

The invention relates to a waterproof inner shoe which can be removed from an outer shoe. The invention further relates to a shoe which contains a waterproof inner shoe according to the invention and a method for applying a coating to the sole region of an inner shoe.

Waterproof inner shoes are known in the shoe industry for the manufacture of waterproof shoes. Such inner shoes usually have the shape of a sock and are made of a waterproof material. They are firmly or releasably attached to a water-permeable outer shoe during the manufacture of waterproof shoes.

U.S. Patent No. RE 34,890 (Sacre) describes a sock-like liner, hereinafter referred to as an inner sock, for insertion into a shoe. This inner sock covers the inner surface of a shoe and consists of a textile laminate, with a waterproof and water vapor permeable functional layer being laminated between two textile outer layers. The functional layer makes the shoe watertight and at the same time allows water vapor to pass through. The inner sock is sewn to the upper edge of the shoe and additionally connected to the shoe via partial (local) adhesive points.

German patent DE 36 28 913 C2 discloses a shoe with a removable sock-like inner lining. The inner lining consists of an inner lining material and is laminated with a textile layer. The inner lining material is an air-permeable, vapor-permeable and waterproof functional layer. The heel and Achilles tendon area of the inner lining are provided with a stiffening outer mold support, which gives the inner lining a shape adapted to the shape of the shaft. This equipment requires simple and wrinkle-free insertion of the inner lining into the interior of the shoe. The lining material is washable.

A removable lining is known from the Italian utility model IT TO94 U 000135, which is fastened in a shoe with the aid of snap fasteners, a zipper or a Velcro fastener. The lining is made of a waterproof and water-vapor-permeable material for waterproofing the shoe. A disadvantage of the sock-like waterproof inner shoes described in the prior art is that they are exposed to strong mechanical stress during their intended use. After a short time, this leads to mechanical damage to the liner, especially the waterproof liner material. Damage to the liner material is the reason that the liner is no longer waterproof.

The well-known inner shoe material contains a waterproof functional layer such as a membrane or a film. This functional layer is usually very thin so as not to impair the mobility of the liner. Even the smallest damage to the functional layer is sufficient to find the liner to be water-permeable.

In the case of shoes with removable inner shoes, foreign matter such as stones, grains, dust particles and the like can get into the space between the outer and inner shoes via the fastening means for fastening the inner shoe in the outer shoe. These foreign bodies rub and rub between the outer and inner shoe material and thereby stress the inner shoe material which contains the thin, waterproof and water-vapor-permeable functional layer. This abrasion and friction stress causes holes and tears to form in the inner shoe material and thereby damages the functional layer in such a way that the waterproofness of the inner shoe is no longer guaranteed.

Furthermore, a removable inner shoe is connected to the outer shoe only at its upper inner shoe edge via various fastening means. As a result, the sole area of the inner shoe is loose and freely movable within the outer shoe. Since no inner fixation of the inner shoe is provided, abrasion and frictional movements of the inner shoe inside the outer shoe occur during the use of a shoe. In the sole and heel area in particular, the upward and downward movement of the sole of the foot results in excessive mechanical stress. The result is that watertight seams rub and holes and tears occur in the inner shoe material and the functional layer. If the foreign bodies listed above are also between the inner shoe and outer shoe material, the damage to the functional layer is accelerated. The entire shoe becomes water-tight and loses its functionality. The object of the present invention is a waterproof shoe with a waterproof inner shoe which can be removed from an outer shoe, the inner shoe being resistant to mechanical loads such as abrasion and friction and thus remaining permanently waterproof.

An additional object of the invention is a waterproof inner shoe which can be removed from an outer shoe and which can be washed several times separately from the outer shoe without losing its waterproofness.

Another additional task consists of a waterproof inner shoe that can anchor itself within an outer shoe in such a way that the inner shoe is strongly adhered to the outer shoe and friction movements between the inner shoe and outer shoe are largely avoided.

Furthermore, it is an object of the present invention to develop a method for producing a permanently waterproof inner liner.

The object is achieved by a shoe which has an outer shoe and an inner shoe. The outer shoe has a shoe bottom containing a shoe bottom material with an inside of the shoe bottom. The liner has a waterproof liner material and a sole area with an outer sole. The outside of the sole is coated with an elastomer. The coating forms a bond with the liner material. In one embodiment, the coating has a coefficient of friction of greater than 0.9 based on the shoe bottom material of the inside of the shoe bottom.

With an inner shoe designed in this way, it is possible to produce a permanently waterproof shoe. The coating provides the outer side of the inner shoe with a protective covering such that abrasive and frictional movements and foreign bodies in the sole area cannot damage the inner material of the inner shoe.

Furthermore, the coating enables the sole area of the inner shoe to adhere to the outer shoe. In connection with the shoe bottom material, the inner shoe shows one high slip resistance. This adhesion of the coating to the shoe bottom material is expressed by the coefficient of friction that the coating material has with respect to the shoe bottom material. Adhesion between the shoe bottom material and the elastomer is achieved with a coefficient of friction greater than 0.9. The coefficient of friction is preferably greater than 1.5.

The coefficient of friction depends on the materials used for the shoe bottom and the coating. The shoe bottom preferably contains an insole which forms the inside of the shoe bottom. Due to the adhesion, the inner shoe shows a firm hold in the outer shoe and is no longer exposed to the earlier rubbing and rubbing movements of a loosely attached inner shoe.

With the waterproof inner shoe according to the invention, it is possible to produce a permanently waterproof shoe. The coating protects both the outside of the sole of the liner from abrasion and friction as well as foreign objects in the sole area.

Furthermore, the inner shoe with the coating is washable. The firm bond between the coating material and the inner shoe material enables the inner shoe to be removed from the outer shoe and washed without there being any signs of detachment between the inner shoe material and the coating material. Detachment phenomena are understood to mean when the coating material detaches from the inner shoe material, for example during a washing process, and there is no longer a protective covering of the outer sole of the inner shoe. The liner can go through more than ten industrial washing cycles without any signs of detachment. After this number of wash cycles, the liner is waterproof in the same way as before.

The elastomer from which the coating is formed is preferably selected from the group of synthetic polymers. These include, among others, silicones, thermoplastic elastomers, polyurethanes, thermoplastic polyurethanes. A mixture of at least two of the aforementioned polymers can also be selected. Natural rubber can also be selected. The polymers from which the coating is formed are preferably in the form of a polymer dispersion, a polymer solution or a polymer melt. In a preferred embodiment, the coating is formed from a polymer dispersion.

A polychloroprene dispersion is preferably used as a natural or synthetic rubber distributed in water. A latex mixture with a proportion of natural rubber is preferably used because such a coating is highly elastic and very stretchy. This offers the advantage that the hardened coating can withstand the buckling and bending stresses in a shoe without the coating breaking or tearing. It is also possible with the polymer dispersion to apply a thin layer of coating material to the sole area, so that the liner remains flexible and flexible.

The coating can be applied to the outside of the sole area of the liner by dipping, brushing, spraying, rolling or with a brush. The coating is preferably applied by soaking or immersing the inner shoe in a bath with the polymer dispersion. This makes it possible to apply the coating precisely within the specified contours of the sole area and to set a defined thickness of the coating by the number and duration of the dipping process.

The polymer dispersion has a viscosity between 40 - 600 mPas / s before it is applied to the sole area of the inner shoe. The viscosity is preferably 40-80 mPas / s. With this low viscosity, the polymer dispersion in a preferred first embodiment can easily flow into the pores and fill the pore spaces and thus produce a firm and non-detachable bond with the liner material.

The fixed bond can be achieved by two preferred embodiments, but the invention is not restricted to these embodiments. In a first embodiment, the inner shoe material preferably contains at least one porous material, so that the elastomer and preferably the polymer dispersion can at least partially penetrate into the pores of the inner shoe material. The Porous material can be a porous waterproof functional layer, a porous textile fabric or a textile laminate which has at least one porous functional layer and at least one porous textile fabric. The advantage of this configuration is that the coating material is anchored in the pores of the inner shoe material during the vulcanization process and becomes an integral part of the inner shoe material. The inner shoe can be easily removed and washed several times from the outer shoe without breaking the bond between the inner shoe material and the coating.

In another embodiment, the inner shoe material contains, in addition to a textile fabric, a non-porous, waterproof functional layer or a textile laminate with at least one non-porous functional layer. The elastomer, for example in the form of a polymer dispersion, penetrates as far as the non-porous functional layer and, due to the adhesive forces between the functional layer and the polymer dispersion, adheres to the functional layer. This accumulation results in firm adhesion between the coating and the functional layer. In this case, too, there is a firm bond between the inner shoe material and the coating. Furthermore, the inner shoe can be removed from the outer shoe and washed as often as desired without there being any signs of detachment between the inner shoe material and the coating.

In a preferred first embodiment, the inner shoe material is a textile laminate with a waterproof and water vapor-permeable functional layer, preferably a membrane made of expanded polytetrafluoroethylene (ePTFE). The functional layer is laminated to at least one textile fabric. This fabric is a woven fabric, a knitted fabric, a fleece or a knitted fabric.

The preferred use of a textile laminate with a waterproof and water vapor-permeable functional layer as the liner material means that the liner is also water vapor permeable in addition to being watertight. Thus, water vapor, such as sweat moisture, is released from the inner shoe via the functional layer and through the outer shoe material to the environment.

The method for producing an inner shoe according to the invention with a sole area and an outer side has the following steps: a) providing an inner shoe, b) inserting a filling material into the inner shoe, c) coating the outside of the sole area of the inner shoe with an elastomer

In addition to step c), the coating can be dried in a further step d). Drying is preferably carried out up to a temperature of 80 ° C in one

Time of maximum 30 min.

In a further step e), which is followed by step d), the is vulcanized

Coating. The vulcanization preferably takes place at a temperature of 120 ° C. in a maximum time of 20 min. The filling material fills the inside of the liner and brings the liner in

Form that the coating can be applied evenly in the sole area.

The filling material is preferably a shoe last.

The inner shoe according to the invention will now be explained in more detail with reference to the following drawings:

Fig.l shows a shoe which is constructed with an inner shoe according to the invention.

Fig.2. shows a section through an outer shoe with an insole and an inner shoe

3 shows the inner shoe according to the invention

Fig. 4 shows a cross section of a textile laminate which is part of an inner shoe.

5 shows a cross section of the functional layer which is used in FIG

Fig. 6 shows a known liner

7 shows the method steps ac for applying the coating according to the invention. definitions:

Waterproof:

The term waterproof means that the material to be examined can withstand a water inlet pressure of more than 0.13 bar. The material can preferably withstand a water pressure of more than 1 bar. The measurement is carried out by exposing a sample of the material to be examined with an area of 100 cm ^{2 to} an increasing water pressure. For this purpose, distilled water with a temperature of 20 ± 2 ° C is used. The increase in water pressure is 60 ± 3 cmH ₂ O / min. The water inlet pressure of the sample corresponds to the pressure at which water breaks through on the opposite side of the sample. The exact method for performing this test is described in ISO Standard No. 811 from 1981.

Water vapor permeable:

The term permeable to water vapor is defined via the water vapor volume resistance Ret of the material so designated. The Ret value is specific

Material property of flat structures or material structures, which the "latent"

Evaporation heat flow through a given area determined by an existing stationary partial pressure gradient.

The water vapor resistance is determined using the Hohenstein skin model test, which is described in the standard test specification No. BPI 1.4 of September 1987 of the

Garment Physiological Institute e.V. Hohenstein.

A membrane / laminate that has a Ret of less than 150 (m ² Pa) / W is defined as permeable to water vapor. The functional layer preferably has a Ret of less than 20 (m ² Pa) / W.

functional layer

The term functional layer is used to describe a layer with waterproof and water vapor permeable properties. Coefficient of friction

The determination of the coefficient of friction μ is used to assess sole materials with regard to their sliding (sliding) behavior on defined floor coverings.

The coefficient of friction is a proportionality constant. It is made up of the frictional force FR and the normal force FN. The friction force FR is the force acting on the contact surface of two solid bodies due to their roughness, which inhibits the movement of the bodies against each other. It acts parallel to the contact surface and against movement. It is proportional to the contact force that presses one body against the other. FR = μ x FN applies

A distinction is made between static and sliding friction. The static friction is the friction that has to be overcome as a threshold value at the beginning of the equilibrium or is the friction between bodies resting relative to each other for which the attacking force is not sufficient to cause a relative movement. The static friction number is denoted by μs.

The sliding friction is the friction between bodies moving relative to each other, which remains effective immediately after overcoming the static friction at the specified sliding speed. The sliding friction number is denoted by μ _r . The coefficient of friction μ is determined by determining the static (μ) and sliding friction coefficients (μ _D ) in accordance with DIN 53375 “Determination of the Friction Ratio”.

The test device described in DIN 53375 consists of a drive mechanism for generating a uniform relative movement of the two friction partners against each other and a force measuring device for registering the friction forces. The relative movement can be achieved by a moving sample table or by moving the measuring device in the opposite direction. The normal force F _N is generated by a friction block with a felt covering and a mass of 200 g.

Two test specimens, each with an area of 80 mm x 200 mm, are required for each measurement. At least three such pairs must be checked. The surfaces of the test specimens must be kept free of contamination. The surfaces of the test specimens are preferably cleaned with alcohol.

The shoe 1 shown in FIG. 1 consists of an outer shoe 20 with an inner shoe 10 according to the invention. The inner shoe 10 has an upper inner shoe edge 16 which encloses an inner shoe opening 18 for receiving a foot. From the inner shoe 10, only the upper inner shoe edge 16 with a fastening device 40 is visible, since the remaining inner shoe 10 is located inside the outer shoe 20.

The outer shoe 20 consists of an outer shoe shaft 22 and a shoe bottom 52. The shoe bottom 52 is the lower region of a shoe 1 and contains an insole 27 (not shown in FIG. 1), an outsole 24 and an outsole 54. In one embodiment, the shoe bottom 52 only one outsole 24 and one outsole 54. The shoe bottom 52 has at least one shoe bottom material 53. The outsole 24 and the outsole 54 are made of waterproof material such as rubber or plastic such as polyurethane or of non-waterproof but breathable material such as in particular leather or leather provided with rubber or plastic inlays. A plastic sole made of polyurethane is preferably used. The outsole 24 is molded onto the outer shoe shaft 22, pinched, glued or sewn on. The outsole 54 is injection molded, tweaked, glued or sewn onto the outsole 24.

The outer shoe upper 22 is constructed with a water-permeable outer shoe material, such as leather or textile materials. The textile materials can be woven, knitted, crocheted, fleece or felt. These textile materials can be made from natural fibers or synthetic fibers. Synthetic fibers are made, for example, from polyesters, polyamides, polypropylenes or polyolefins or mixtures of at least two such materials. The outer shoe shaft 22 has a tongue area 23 with a tongue 25. The tongue 25 can be in the form of a tongue bag connected to the outer shoe shaft 22 or as a tongue 25 which can move freely from the outer shoe shaft 22. On the outside 26 of the outer shoe shaft 22 there are a plurality of closure elements such as eyelets 36 for receiving a lacing strap Attachment of the shoe 1 attached to a foot. Instead of the eyelets 36, hooks, loops or a Velcro fastener can also be provided.

The outer shoe shaft 22 has an upper outer shoe edge 29. The upper outer shoe edge 29 forms an outer shoe opening 38 for receiving the inner shoe 10.

An outer shoe fastening device 50 for fastening the inner shoe 10 is preferably located on the outer side 26 at the upper outer shoe edge 29.

As can be seen in FIG. 2, the outer shoe 20 contains a shoe bottom 52 which contains at least one shoe bottom material 53 and which contains an insole 27. The outer shoe 20 has an outer shoe shaft 22 with an outer side 26 and an inner side 28. Furthermore, the shoe bottom 52 has an outer sole 24 and an outsole 54. The insole 27 is glued to the outsole 24 and, with its insole surface 39 facing the outer shoe opening 38, forms the inside of the shoe bottom 56. The insole 27 has an insole material from the group consisting of leather, leather substitutes, plastics and textile fabrics. In one embodiment, the insole 27 is a combination of at least two insole materials from the group consisting of leather, leather substitutes, plastics, rubber and textile fabrics. The textile fabric can be a woven fabric, a knitted fabric, a non-woven fabric or a knitted fabric, needle fleece preferably being used. For example, nylon is used as the plastic.

An insole 27 made of leather or leather substitutes is preferably selected. Customary insoles 27 are made of viscose, for example a viscose insole available under the trade name TEXON® from Texon Mockmuhl GmbH in Mockmuhl, Germany, or a fleece insole such as polyester fleece, to which melt fibers can be added. An insole 27 made of leather or glued leather fibers is also common.

In the outer shoe 20 there is an inner shoe 10 according to the invention with a coating 30 in its sole area 12. The sole area 12 of the inner shoe 10 lies on the surface 39 of the insole 27, which forms the inside of the bottom 56. An inner shoe 10 according to the invention is shown schematically in FIG. 3. The inner shoe 10 contains an inner shoe material 15 and has a sole area 12 and an outer side 14. The inner shoe 10 has an upper inner shoe edge 16 which encloses an inner shoe opening 18 for receiving a foot. At the upper inner shoe edge 16 there is an inner shoe fastening device 40 for attaching the inner shoe 10 to the outer shoe fastening device 50 of the outer shoe 20.

Reinforcing materials or padding 19 can be attached to the outer side 14 of the inner shoe 10. The inner shoe 10 has a tongue bag 17 connected to the inner shoe material 15. The inner shoe 10 is assembled from individual parts consisting of inner shoe material 15.

The sole area 12 of the inner shoe 10 includes the tip 32 and heel 34 and a sole edge area 21. The outside 14 of the inner shoe 10 is provided with a coating 30 in the sole area 12. As shown in FIG. 3, the coating 30 completely covers the sole region 12 in one embodiment.

The inner shoe 10 and the outer shoe 20 are connected to one another via a first fastening device 40 and a second fastening device 50. The first fastening device 40 and the second fastening device 50 can be formed from a Velcro fastener, a zipper, from hooks and eyes, from cords or from push buttons. In FIG. 3, the first fastening device 40 is designed, for example, as a Velcro fastener. In a preferred embodiment, as shown in Figure 1, mainly waterproof push buttons 62 are used. These are attached to the upper edge area of the inner shoe 10 and outer shoe 20. In addition, the tongue 25 of the outer shoe 20 and the tongue bag 17 of the inner shoe 10 can be fastened to one another via a further Velcro fastener.

The inner shoe material 15 can be made of synthetic or natural material and is waterproof.

The inner shoe material 15 preferably has a waterproof and water vapor-permeable functional layer 45, which is connected to at least one textile fabric 82 to form a textile laminate 80. FIG. 4 shows the cross section of the textile laminate 80 made of an inner shoe material 15. The textile laminate 80 consists of three layers, a first textile fabric 82, the waterproof and water vapor-permeable functional layer 45 and a second textile fabric 84. The functional layer 45 has a first side 47 and a second side 49. The first textile fabric 82 and the second Textile fabrics 84 are each laminated on the first side 47 or on the second side 49 of the functional layer 45. In one embodiment, the functional layer 45 can also be connected only to a textile fabric 82.

A textile fabric 82 can be a woven fabric, a knitted fabric, a nonwoven or a knitted fabric. A variety of materials such as polyesters, polyamides (nylon), polyolefins and others can be considered as materials. The first textile fabric 82 and the second textile fabric 84 are preferably a smooth or roughened knitted fabric made of polyester.

The functional layer 45 is preferably a membrane or a film. Suitable materials for a waterproof functional layer 45 are polytetrafluoroethylene, polyurethane, polyurethane polyester, polyethylene, silicone, polyolefin, polyacrylate, polyamide, polypropylene including polyetherester. The functional layer 45 can be porous or non-porous.

In one embodiment of this invention, the functional layer 45 is a porous polymeric layer 60 with a continuous, non-porous, hydrophilic, water vapor-permeable layer 70. Such a layer structure can be seen in FIG. 5. The functional layer 45 is watertight and has a water vapor volume resistance of less than 150 × 10 ^-3 (m ² mbar) / W.

Preferably, the porous polymeric layer 60 is a microporous polymeric membrane with a microscopic structure of open interconnected microvoids. This layer is air permeable and water vapor permeable.

Plastic polymers as well as elastic polymers can be used as polymers for the microporous membrane. Suitable polymers can be, for example, polyesters, polyamides, polyolefins, polyketones, polysulfones, polycarbonates, Fluoropolymers, polyacrylates, polyurethanes, copolyether esters, copolyether amides and others. The polymers are preferably plastic polymers.

The most preferred microporous polymeric material is expanded polytetrafluoroethylene (ePTFE). This material is characterized by a large number of open, interconnected cavities, a large cavity volume and a large thickness. Expanded polytetrafluoroethylene is soft, flexible, has stable chemical properties, a high water vapor transfer and a surface with good repellency against impurities. The patents US-A-3 953 566 and US-A-4 187 390 describe the production of such membranes from microporous expanded polytetrafluoroethylene and reference is expressly made to these patents.

The continuous water vapor permeable layer 70 is a hydrophilic polymer. Without limitation, suitable continuous water vapor permeable polymers are those from the polyurethane family, the silicone family, the copolyetherester family or the copolyetherester family of amides. Suitable copolyether esters of hydrophilic compositions are taught in US-A-4,493,870 (Vrouenraets) and US-A-4,725,481 (Ostapachenko). Suitable polyurethanes are described in US-A-4 194 041 (Gore). Suitable hydrophilic compositions can be found in US-A-4,234,838 (Foy et al.). A preferred class of continuous water vapor permeable polymers are polyurethanes, especially those containing oxyethylene units as described in US-A-4,532,316 (Henn).

Textile laminates 80 with the waterproof and water vapor-permeable functional layer 45 described above are available from W.L. Gore & Associates under the name GORE-TEX® laminate.

To produce an inner shoe 10, individual parts are cut from an inner shoe material 15, such as, for example, from the textile laminate described above, and joined to form an inner shoe 10 with at least one seam 13. Such a manufactured inner shoe 10 is shown in FIG. 6. The resulting seams 13 can, for example, run in the Achilles heel area 4 and in the forefoot area 6. The area where the Achilles heel of a foot is located is referred to as the Achilles heel area 4 of an inner shoe 10. The forefoot portion 6 of the liner 10 includes the toes and the back of a foot. The seams 13 can be sewn, welded or glued and are watertight. For this purpose, the seams 13 are preferably sealed with a waterproof seam sealing tape 86. Such a seam sealing tape 86 is sold under the brand name GORE-SEAM® seam sealing tape by the company WLGore & Associates. The production of a waterproof and water vapor permeable inner shoe 10 is described in US Pat. No. RE 34,890 and express reference is made to this patent.

3, the outer side 14 of the inner shoe 10 in the sole area 12 is provided with a coating 30.

The coating 30 is made of an elastomer. A vulcanized elastomer is preferably present. The elastomer is a natural or a synthetic polymer. In one embodiment, a mixture consisting of a natural and a synthetic polymer is applied to the inner shoe 10. Natural rubber is preferably chosen as the natural polymer. The synthetic polymers come from the group of silicones, thermoplastic elastomers such as styrene-butadiene (SBS) or styrene-isophorone (SJS), polyurethanes, thermoplastic polyurethanes. The synthetic polymers are preferably selected from the group of the polychloroprene homopolymers (CR), the acrylonitrile-butadiene copolymers (NBR) and the carboxylated acrylonitrile-butadiene copolymers (XNBR), polyurethanes.

The elastomer can be formed from a polymer dispersion, a polymer solution or a polymer melt. A polymer dispersion 95 is preferably used. A polychloroprene dispersion is preferably selected from the group of synthetic polymers. A corresponding polymer dispersion 95 is available, for example, from Polymer Latex GmbH, based in Mari, Germany, under the brand names BAYPREN®Latex and PERBUNAN®N Latex. A polymer dispersion 95 which consists of a BAYPREN® latex with a proportion of natural rubber is particularly preferred. This polymer blend is highly elastic and very stretchy. It is available, for example, from WOLFF Gummi + Kunststoffe, based in Mörlenbach, Germany.

The coating 30 is applied by dipping, spraying or brushing an elastomer onto the outside 14 of the inner shoe 10 in the sole area 12. The inner shoe 10 is preferably immersed in a polymer dispersion 95. When the polymer dispersion 95 is applied, it forms a bond with the inner shoe material 15.

If there is a textile laminate 80 as the inner shoe material 15, the polymer dispersion 95 penetrates through the first textile fabric 82 to the functional layer 45. The first textile fabric 82 is completely impregnated with the polymer dispersion 95. In the case of a porous functional layer 45, the polymer dispersion 45 additionally penetrates at least partially into the pores of the functional layer 45 and thus forms a firm bond between the textile laminate 80 and the polymer dispersion 95.

In the case of a non-porous functional layer 45, the polymer dispersion 95 is preferably attached to the functional layer 45 without bubbles. In this process, the bond comes about through the adhesion of the polymer dispersion 95 on the non-porous functional layer 45 due to adhesive forces.

Polymer dispersions 95 with a low viscosity are required for these processes. The viscosity of a polymer dispersion is between 40-600 mPas / sec, preferably between 40-80 mPas / sec.

In a preferred embodiment, the inner shoe material 15 contains a textile laminate 80 with a microporous functional layer 45. The functional layer 45 is a microporous ePTFE membrane, which is laminated together with a first sheet 82 made of a polyester knit and a second sheet 84 also made of a polyester knit.

The polymer dispersion 95 penetrates the first textile fabric 82 of the textile laminate 80 during the dipping process and completely soaks and encases the polyester fibers. Due to the low viscosity of the polymer dispersion 95, this can at least partially reach the pores of the microporous functional layer 45. The polymer dispersion 95 penetrated in this way hardens within the pores of the functional layer 45 and the pores of the first textile fabric 82 and form a solid and non-detachable bond in itself and simultaneously with the textile laminate 80.

This process of coating the outside 14 of the inner shoe 10 in the sole region 12 is not restricted to the use of a polymer dispersion 95. In addition to one Polymer dispersion 95 can also be used as polymer solutions or polymer melts for coating the outer side 14.

The coating 30 is preferably applied by dipping the sole region 12 of the inner shoe 10 into a polymer dispersion 95. A schematic representation of the dipping process is shown in Figure 7 a-c and is explained below.

FIGS. 7a-c show an immersion container 90 in which there is sufficient polymer dispersion 95 at room temperature between 10-35 ° C., advantageously around 20 ° C.

The prefabricated inner shoe 10 made of the textile laminate 80 is provided. A shoe last 98 is inserted into the inner shoe 10. The shoe last 98 has the function of filling the inner shoe 10 and thus giving it a three-dimensional foot-like shape. Furthermore, the surface of the inner shoe 10 is thereby tightened and the coating 30 can be applied evenly and smoothly. The shoe last 98 is designed to be pivotable on a rod 92.

The first step of a diving process is shown in FIG. 7a. The inner shoe 10 is pivoted so that the heel area 34 is immersed in the polymer dispersion 95. In a second step, as can be seen in FIG. 7b, the inner shoe 10 swivels in the immersion container 90 in such a way that the outside 14 of the sole area 12 dips into the polymer dispersion 95 toward the heel area 34. A sole edge region 21 is also covered with polymer dispersion 95. The height of the sole edge region 21 can be adjusted as required by dipping the inner shoe 10 higher or lower into the polymer dispersion 95. The height of the sole edge region 21 is preferably not more than 5 cm.

A third step of the dipping process is shown in FIG. 7c. The inner shoe 10 swings out of the immersion container 90. The tip 32 of the inner shoe 10 is immersed deeply in the polymer dispersion 95.

With these three steps 7a-7c, the entire sole region 12 has received a coating 30 made of the polymer dispersion 95. The layer thickness d of the coating 30 should be more than 0.2 mm. The layer thickness should preferably be between 0.4 mm and 4 mm. A layer thickness d of 1 mm is particularly preferred so that the inner shoe 10 remains movable and flexible.

After the dipping process, the coating 30 is dried and vulcanized to harden the polymer dispersion 95. The drying immediately follows the dipping process. This process step serves to remove moisture from the polymer dispersion 95 in order to prevent the formation of bubbles in the coating 30 by evaporating moisture during the later vulcanization process. Drying takes place in an oven at a temperature around 70 ° C for a maximum of 30 minutes. A flow dryer from Heraeus can be used as the drying oven.

The vulcanization takes place after drying and serves to harden the polymer dispersion 95 on and in the inner shoe material 15. This step is carried out in an oven at a temperature of around 120 ° C. for a maximum of 20 minutes. A known UVSM drying tunnel can be used as the furnace.

In a further exemplary embodiment, the coating 30 is applied to the sole region 12 by spraying. For this purpose, a prefabricated inner shoe 10 made of the textile laminate 80 is provided. A shoe last 98 is inserted into the inner shoe 10. The outside 14 of the inner shoe 10, with the exception of the sole area

12 covered, so that the sole area 12 with tip 32, heel 34 and sole edge area

21 remains free. A commercially available spray gun, for example a GR 92 spray gun from Sata from Korn-Westheim, Germany, is filled with a polymer dispersion 95. The free sole area 12 of the inner shoe 10 is sprayed with the polymer dispersion 95 from the spray gun until the entire sole area 12 is visually homogeneous with the

Polymer dispersion 95 is covered. The thickness of the coating 30 can be adjusted over the duration of the spraying process. The coating 30 is then dried and vulcanized in order to harden the polymer dispersion 95.

The coefficient of friction μ of the inner shoe 10 according to the invention with a coating 30 in the sole area 12 was determined in relation to the commonly used shoe bottom materials and the coated inner shoe material 15. The test is carried out and evaluated in accordance with DIN 53375. For this purpose, the friction behavior of an inner shoe material 15 with a coating 30 according to the invention against two insole materials is examined. The first test specimen is the inner shoe material 15 with coating 30 according to the invention. The second test specimen is two insole materials as a friction surface. The first insole material is the TEXON® described above and the second insole material is an insole leather. The results are shown in Table 1:

Table 1 Adhesion and friction coefficients

The inner shoe material has been tested in two versions. Article 1 (cover) is a surface product in the form of a textile laminate 80 with the inventive

Cover 30. Article 2 (inner shoe) provides the inner shoe 10 according to the invention

Cover 30 in the sole area 12.

The test results show very high values for both the adhesive and the

Coefficient of sliding friction. The values for the pair of cover 30 / insole leather go above 3 on average. These high values are due to a particularly good adhesion between the test specimens. With a constant normal force F _N , very large friction forces are necessary to move the test specimens against each other. This results in the high coefficients of friction.

Furthermore, the number of industrial washing cycles was determined without there being any signs of detachment between the inner shoe material 15 and the cover 30. The inner shoe 10 can be removed from the outer shoe 20 and washed. The washing process corresponds to an industrial washing cycle and can be carried out, for example, with an washing machine from the Electrolux Wascator TT 600 brand.

The industrial washing cycle for the inner shoe 10 has the following procedure in this type of washing machine, the desired temperature for the washing being greater than 40 ° C. and preferably being 60 ° C.

Main wash 1

Water up to a level of 170 units is admitted and to the desired one

Temperature heated. 170 units corresponds to a water volume of 751 in the above

Washing machine. This represents a liquor ratio of about 1 kg of laundry to 51 water.

A normal wash cycle program is then carried out for 20 minutes with detergent. The water is then drained, which takes about a minute, and then cold tap water is let in, for example at 15 ± 5 ° C.

Main wash 2

Water up to a level of 170 units is admitted and heated to the desired temperature. A normal wash cycle program is then carried out for 10 minutes with detergent. The warm water is then drained, which takes about a minute, and then cold tap water is let in, for example at 15 ± 5 ° C.

Rinse 1

Water up to a level of 190 units is run in and heated to the desired temperature. 190 units corresponds to a water quantity of 831 in the washing machine mentioned above. Then a normal wash cycle program is carried out for 2 minutes without detergent. The water is then drained out, which takes about a minute, and then cold tap water is run in, for example at 15 ± 5 ° C. This rinsing process is carried out twice in total (rinsing 2).

Spin 1

After the third rinse cycle, the laundry is spun for 2 minutes at low speed, which corresponds to gravity of 60 G, and then for 3 minutes at high speed, which corresponds to gravity of 160 G.

Rinse 2

This rinse cycle is identical to the first rinse cycle.

Spin 2

This spin cycle is identical to the first spin cycle.

Then the washing cycle is over and the laundry can be removed from the washing machine.

Leggil Super from Henkel KGaA with 15 g / kg laundry in the first washing process and 10 g / kg laundry in the second washing process is preferably used as the detergent for the inner shoe.

The inner shoe 10 according to the invention can undergo the above washing cycle ten times without there being any signs of detachment between the coating 30 and the inner shoe material 15 and without the inner shoe material 15 losing its waterproof and water vapor permeable values. Detachment phenomena occur when the covering 30 can separate from the inner shoe material and there is no longer a protective covering of the outer side 14 of the inner shoe 10.

Furthermore, the inner shoe 10 is waterproof after ten washing cycles. For this purpose, the inner shoe 10 was tested for water resistance after 10 washing cycles in a test device and according to a method in accordance with US Pat. No. 4,799,384. For this test, the inner shoe 10 is loaded with compressed air and lowered into a container with water. If air bubbles emerge from the inner shoe 10 into the water within the test time, there is no watertightness.

In the inner shoe 10 according to the invention, no air bubbles emerged even after 10 washing cycles, so that the inner shoe 10 is watertight.

LIST OF REFERENCE NUMBERS

1 shoe

4 Achilles heel area 6 Forefoot area

10 inner shoe

12 sole area liner

13 seams

14 outer liner 15 inner liner material

16 upper inner shoe edge

17 tongue pouches

18 liner opening

19 reinforcement materials / padding 20 outer shoe

21 Sole area of the inner liner

22 outer shoe shaft

23 tongue area

24 outsole 25 tongue

26 Outside outer shoe shaft

27 insole

28 inside outer shoe shaft

29 upper edge of the outer shoe upper 30 coating

32 pointed liner

34 heel liner

36 eyelets

38 Outer shoe opening 39 Insole surface

40 Liner fastening device

45 functional layer

47 first page functional layer

49 second side functional layer 50 fastening device outer shoe

52 shoe bottom

53 shoe bottom material

54 outsole

56 inside of the shoe bottom 60 porous polymer layer

62 snaps

70 hydrophilic water vapor permeable layer

80 textile laminate

82 first textile fabric 84 second textile fabric

86 seam sealing tape

90 immersion tanks

92 rod

95 polymer dispersion 98 filling material

Claims

1. Shoe (1) with an outer shoe (20) with an outer shoe opening (38) and an inner shoe (10) located in the outer shoe (20), wherein

the outer shoe (20) has a shoe bottom (52) containing at least one shoe bottom material (53) with an inside of the shoe bottom (56) facing the outer shoe opening (38),

and the liner (10) comprises a waterproof liner material (15), wherein

the inner shoe (10) has a sole area (12) with an outer sole (14) and the outer sole (14) is provided with a coating (30) made of an elastomer.

2. Shoe (1) according to claim 1, wherein the coating (30) has a coefficient of friction greater than 0.9 based on the shoe bottom material (53) of the inside of the shoe bottom (56).

3. Shoe (1) according to claim 1, wherein the shoe bottom (52) has an insole (27) forming the inside of the shoe bottom (56).

4. Shoe (1) according to claim 1, wherein the shoe bottom (52) is an outer sole forming the inside of the shoe bottom (56)

(24).

5. Shoe (1) according to claim 3, wherein the insole (27) is selected from the group of materials such as leather, leather substitutes, plastics, textiles.

6. Shoe (1) according to claim 3, wherein the insole (27) is a combination of at least two insole materials from the group of leather, leather substitutes, plastics, textiles.

7. Shoe (1) according to claim 4, wherein the outsole (24) is selected from the group of materials such as leather, rubber, plastics.

8. Shoe (1) according to claim 1, wherein the inner shoe material (15) is a textile laminate (80) with at least one waterproof and water vapor-permeable functional layer (45).

9. Shoe (1) according to claim 8, wherein the functional layer (45) is a membrane or a film.

10. Shoe (1) according to claim 8, wherein the functional layer (45) from the group of substances consisting of polyester, polyamides, polyolefins containing polyethylene and polypropylene, polyvinyl chloride, polyketones, polysulfones, polycarbonates, fluoropolymers, polyacrylates, polyurethanes, copolyether esters, copolyether amides is selected.

11. Shoe (1) according to claim 10, wherein the functional layer (45) is expanded PTFE.

12. Shoe (1) according to claim 1, wherein the coating (30) is made of a vulcanized elastomer.

13. Shoe (1) according to claim 1, wherein the elastomer comprises synthetic polymers.

14. Shoe (1) according to claim 13, wherein the elastomer is selected from the group of silicones, thermoplastic elastomers, polyurethanes, thermoplastic polyurethanes.

15. Shoe (1) according to claim 1, wherein the elastomer is formed from a polymer dispersion, a polymer solution, a polymer melt.

16. Shoe (1) according to claim 15, wherein the polymer dispersion (95) from the group of polychloroprene homopolymers (CR), acrylonitrile-butadiene copolymers (NBR) and carboxylated acrylonitrile

Butadiene copolymer (XNBR), polyurethane is selected.

17. Shoe (1) according to claim 15, wherein the polymer dispersion (95) comprises natural rubber.

18. Shoe (1) according to claim 15, wherein the polymer dispersion (95) is a polychloroprene dispersion.

19. Shoe (1) according to claim 1, wherein the inner shoe (10) endures at least 10 industrial washing cycles.

20. Shoe (1) according to claim 19, wherein the inner shoe (10) is waterproof after at least 10 industrial washing cycles.

21. Shoe (1) according to claim 1, wherein the inner shoe material (15) withstands a water inlet pressure of greater than 0.13 bar.

22. Shoe (1) according to claim 8, wherein the textile laminate (80) contains a first textile fabric (82) which is laminated to a first side (47) of the functional layer (45).

23. Shoe (1) according to claim 22, wherein a second textile fabric (84) is laminated on a second side (49) of the functional layer (45).

24. Shoe (1) according to claim 22, wherein the first textile fabric (82) is a woven fabric, a knitted fabric, a non-woven fabric or a knitted fabric.

25. Shoe (1) according to claim 23, wherein the second textile fabric (84) is a woven fabric, a knitted fabric, a fleece or a knitted fabric.

26. Shoe (1) according to claim 1, wherein the inner shoe (10) has at least two inner shoe material pieces (15) which are connected to one another by at least one seam (13).

27. Shoe (1) according to claim 26, wherein the at least one seam (13) of the inner shoe (10) is welded to a waterproof seam sealing tape (86).

28. Shoe (1) according to claim 1, wherein the inner shoe (10) with the outer shoe (20) is detachably connected.

29. Shoe (1) according to claim 28, wherein the inner shoe (10) has an upper inner shoe edge 16) with a first

Fastening device (40) and the outer shoe (20) has an upper outer shoe edge (29) with a second fastening device (50) and the inner shoe (10) in the outer shoe (20) by closing the first fastening device (40) with the second fastening device ( 50) is detachably connected.

30. A method for producing an inner shoe (10) with a sole area (12) with the following steps: a) providing an inner shoe (10) b) introducing a filling material (98) into the inside of an inner shoe (10) c) coating the sole area (12) of the inner shoe (10) with an elastomer

31. The method of claim 30, wherein after step c) in step d) drying the

Coating (30) takes place.

32. The method according to claim 31, wherein in step d) the drying is carried out at a temperature of 70 ° C in a time of at most 30 min.

33. The method of claim 30, wherein after step d) in step e) the coating (30) is vulcanized.

34. The method according to claim 33, wherein in step e) the vulcanization is carried out at a temperature of 120 ° C in a time of at most 20 min.

35. The method of claim 30, wherein a shoe last is used as filling material (98).

36. The method of claim 30, wherein the coating is dipping, brushing, spraying.

37. The method of claim 30, wherein the elastomer comprises synthetic polymers.

38. The method according to claim 37, wherein the elastomer is selected from the group of silicones, thermoplastic elastomers, polyurethanes, thermoplastic polyurethanes.

39. The method of claim 30, wherein the elastomer is formed from a polymer dispersion, a polymer solution, a polymer melt.

40. The method of claim 39, wherein the polymer dispersion (95) is selected from the group of polychloroprene homopolymers (CR), acrylonitrile-butadiene copolymers (NBR) and carboxylated acrylonitrile-butadiene copolymers (XNBR), polyurethanes.

41. The method of claim 39, wherein the polymer dispersion (95) contains natural rubber.

42. The method of claim 39, wherein the polymer dispersion (95) is a polychloroprene dispersion.

43. The method of claim 39, wherein the polymer dispersion (95) has a viscosity of 40-600 mPas / s.

44. The method of claim 43, wherein the polymer dispersion (95) has a viscosity of 40-80 mPas / s.

45. inner shoe (10) for fastening in an outer shoe (20),

wherein the inner shoe (10), which has a waterproof inner shoe material (15), has a sole region (12) with a sole outer side (14) and

the sole outer side (14) is provided with a coating (30) which forms a composite with the inner shoe material (15).

46. Inner shoe (10) according to claim 45, wherein the coating (30) is made of an elastomer.

47. liner (10) according to claim 46, wherein the coating (30) is made of a vulcanized elastomer.

48. liner (10) according to claim 45, wherein the liner material (15) comprises a material with pores and the coating (30) at least partially penetrates into the pores.

49. liner (10) according to claim 45, wherein the liner material (15) comprises a material without pores and the coating (30) adheres to at least the sole outer side (14).

50. liner (10) according to claim 45, wherein the liner material (15) is a textile laminate (80) with at least one waterproof and water vapor permeable functional layer (45).

51. liner (10) according to claim 50, wherein the functional layer (45) is a membrane or a film.

52. liner (10) according to claim 45, wherein the functional layer (45) from the group of substances consisting of polyester, polyamides, polyolefins containing polyethylene and polypropylene, polyvinyl chloride, polyketones, polysulfones, polycarbonates, fluoropolymers, polyacrylates, polyurethanes, copolyether esters, copolyether amides is selected.

53. Inner shoe (10) according to claim 52, wherein the functional layer (45) is expanded PTFE.

54. liner (10) according to claim 46, wherein the elastomer comprises synthetic polymers.

55. liner (10) according to claim 52, wherein the elastomer is selected from the group of silicones, thermoplastic elastomers, polyurethanes, thermoplastic polyurethanes.

56. liner (10) according to claim 46, wherein the elastomer of a polymer

Dispersion, a polymer solution, a polymer melt is formed.

57. Liner (10) according to claim 56, wherein the polymer dispersion (95) from the group of polychloroprene homopolymers (CR), acrylonitrile-butadiene copolymers (NBR) and carboxylated acrylonitrile-butadiene copolymers (XNBR), polyurethanes is selected.

58. Liner (10) according to claim 56, wherein the polymer dispersion (95) comprises natural rubber.

59. Liner (10) according to claim 56, wherein the polymer dispersion (95) is a polychloroprene dispersion.

60. liner (10) according to claim 45, wherein the liner (10) endures at least 10 industrial washing cycles.

61. Liner (10) according to claim 60, wherein the liner (10) is waterproof after at least 10 industrial washing cycles.

62. liner (10) according to claim 45, wherein the liner material (15) withstands a water inlet pressure of greater than 0.13 bar.

63. Liner (10) according to claim 48, wherein the textile laminate (80) contains a first textile fabric (82) which is laminated to a first side (47) of the functional layer (45).

64. Inner shoe (10) according to claim 63, wherein a second textile fabric (84) is laminated to a second side (49) of the functional layer (45).

65. Inner shoe (10) according to claim 63, wherein the first textile fabric (82) is a woven fabric, a knitted fabric, a fleece or a knitted fabric.

66. Inner shoe (10) according to claim 64, wherein the second textile fabric (84) is a woven fabric, a knitted fabric, a non-woven fabric or a knitted fabric.

67. inner shoe (10) according to claim 45, wherein the inner shoe (10) has an upper inner shoe edge (16) with a first fastening device (40) for fastening the inner shoe (10) to the outer shoe (20).