EP1013823A1 - Tissue paper product and lotion for its manufacture - Google Patents

Abstract

Toilet tissues with improved softness are made by treating tissue paper based on cellulose fibre material with an aqueous or non-aqueous lotion containing a softener selected from mineral oils, alkyl ethoxylates and fatty acid esters, a quaternary ammonium compound of formula (I) and a polysiloxane. Tissue paper product based on cellulose fibre material is treated with an aqueous or water-free lotion comprising: (a) up to 20 wt. %, preferably 4-10 wt. % of a softener selected from mineral oils, alkyl ethoxylates, fatty acid esters or mixtures of these; (b) up to 5 wt. % of a quaternary ammonium compound of formula (I); and (c) up to 20 wt. % of a polysiloxane. Two or three substitutents R = 1-6 C alkyl or hydroxyalkyl and the remaining substituent(s) R = 14-22 C hydrocarbon group or a biologically decomposable ester group X = a physiologically acceptable anion.

Description

The invention relates to a very particularly soft Tissue paper product made by treating a Celullose fiber material with a special lotion.

It is known that sanitary paper as handkerchiefs, Facial tissues, paper towels and toilet paper find extensive application. Depending on the intended Different uses of Tissue papers are required. So are kitchen towels and still to an even greater extent with towels strength, in particular Strength when wet and high suction power required, to meet the needs of the consumer. At other products such as handkerchiefs or facial tissues Softness of the surface and very good conformability the most salient features, the utility value determine these products. With toilet paper one Combination of high wet and dry strength as well demands particular softness from the consumer.

1.

Auswahl geeigneter Rohstoffe, insbesondere der Zellstoffe;

2.

maschinentechnische Maßnahmen wie die Mahlung, Blattbildung, Trocknung, Kreppung und Glättung; und

3.

chemische Zusatz- und Hilfsstoffe.

The usual measures for producing the softness of a tissue paper can be divided into three main categories:

1.

Selection of suitable raw materials, especially pulp;

2nd

mechanical measures such as grinding, sheet formation, drying, creping and smoothing; and

3rd

chemical additives.

The manufacturing process of tissue products involves independent of its different variants the following procedural Steps:

Suspend the fibrous material in water, possibly adding chemical auxiliaries for the targeted influencing of Product properties and process flow, activation of Fiber surfaces for tapping the strength potential of the fiber raw materials by mechanical treatment such as grinding in a refiner, sheet formation by laying down the fibers, oriented or in a confused position on one or between two endless rotating sieves of the paper machine under simultaneous Removal of the bulk of the dilution water up to to dry contents between 12 and 35%, drying of the formed primary nonwoven fabric in one or more Mechanical or thermal steps up to one Final dry content of around 93 to 97%. Among those for tissue production The most relevant steps continue to be the Crepe process that dominates the conventional process Properties of the finished tissue product affected. At the Dry crepe process is the crepe on a drying cylinder carried out, of which the tissue paper product with a crepe scraper is replaced as soon as it reaches the intended Final dry matter content of 93 to 97%. For older people Processes with lower demands on tissue quality the wet crepe process is also used, which is similar to the Dry crepe process, but at lower dry contents below 80%, usually around 55 to 65% dryness expires, which is followed by drying on subsequent Drying cylinders of a dryer section up to the final dry content connects. The creped, end-dry raw tissue paper is then wound up on tubes to mother rolls and stands in this form for further processing into finished products to disposal.

For the production of multi-layer tissue papers such as handkerchiefs, Toilet paper, towels or kitchen towels are in an intermediate step is often the number of paper layers increased by adding multiple single ply parent rolls to one multilayer mother roll can be wound up.

Further processing processes, for example into folded products like handkerchiefs or facial tissues take place in downstream, separate operations, being special, for the task constructed processing machines used become. The tissue paper product is smoothed, Edge embossing, sometimes combined with a flat one and / or selective gluing to generate layer adhesion the individual layers to be brought together as well as Longitudinal section, folding, cross section, storage and merging several individual wipes and their packaging in so-called wipe bags or special boxes as well as their merging larger packaging or containers.

It is now also known that the usage properties of the tissue paper product through the use of Allow chemicals to influence its manufacture. The supply of the chemicals in Form a lotion on the raw tissue paper product during its creation, during the formation of the multilayer or during subsequent processing can be applied. Lotions are both understood water-containing as well as water-free preparations, the generally polyhydroxy compounds such as glycol or Contain polyethylene glycol or polysiloxanes. Despite numerous recipe suggestions for such lotions So far, however, it has not become known that a whole unexpected increase in softness in tissue paper products if a mineral oil or fatty acid ester together with a quaternary ammonium compound and a Polysiloxane for the treatment of a raw tissue paper product be used without the mechanical Properties are adversely affected.

a) bis zu 20 Gewichtsprozent, vorzugsweise 4 bis 10 Gewichtsprozent eines Weichmachers ausgewählt aus der Gruppe der Mineralöle, der Alkylethoxylate oder der Fettsäureester oder ihren Mischungen,

b) bis zu 5 Gewichtsprozent einer quaternären Ammoniumverbindung der Formel I

in der zwei oder drei der Substituenten R ein C₁ bis C₆-Alkyl- oder Hydroxyalkylrest und die übrigen Substituenten R einen C₁₄ bis C₂₂-Kohlenwasserstoff-rest oder eine biologisch abbaubare Estergruppierung sind und X ein physiologisch verträgliches Anion bedeutet, und

c) bis zu 20 Gewichtsprozent eines Polysiloxans.

The invention therefore relates to a tissue paper product which has been treated with a water-containing or water-free lotion

a) up to 20 percent by weight, preferably 4 to 10 percent by weight, of a plasticizer selected from the group of mineral oils, alkyl ethoxylates or fatty acid esters or their mixtures,

b) up to 5 percent by weight of a quaternary ammonium compound of the formula I.

in which two or three of the substituents R are a C ₁ to C ₆ alkyl or hydroxyalkyl radical and the other substituents R are a C ₁₄ to C ₂₂ hydrocarbon radical or a biodegradable ester group and X is a physiologically acceptable anion, and

c) up to 20 percent by weight of a polysiloxane.

This lotion can also contain a polyhydroxy compound contained in an amount of up to 20 percent by weight. The Polyhydroxy compound should have a molecular weight between 10 and 4,000, preferably between 100 and 1,000 and preferably from glycerin, a polyethylene glycol, a Polypropylene glycol or preferably from dipropylene glycol or their mixtures exist.

The lotion according to the invention is liquid at room temperature and can add other ingredients besides those mentioned known additives such as perfumes, disinfectants, Deodorants and stabilizers included.

An essential component of the lotion according to the invention is in the mineral oil, alkyl ethoxylate or fatty acid ester to see. These substances act as plasticizers. As mineral oil can be a liquid hydrocarbon with 16 to 32 carbon atoms be used. Conduct suitable fatty acid esters with a saturated or unsaturated fatty acid 12 to 28 carbon atoms, preferably 16 to 22 carbon atoms from. These fatty acids are with a 1 to 8 Aliphatic alcohol comprising carbon atoms esterified. Preferred examples of the fatty acid esters suitable for this are methyl palmitate, methyl stearate, isopropyl laurate, isopropyl myristate, Isopropyl palmitate and ethylhexyl palmitate.

Alkyl ethoxylates are also used as softening additives suitable the lotion of the invention. This includes Ethoxylates, which are derived from fatty alcohols with 12 to 18 carbon atoms and generally between 3 to 30 Wear oxyethylene units. Typical examples of such Alkyl ethoxylates include 3 to 10 lauryl ethoxylates Oxyethylene units, lauryl ethoxylates with 23 to 25 oxyethylene units, Cetyl ethoxylates with 10 oxyethylene units, Stearyl ethoxylates with 10 to 12 oxyethylene units. This Alkyl ethoxylates can be used alone in the lotion according to the invention or in combination with mineral oils and / or fatty acid esters be used. Is this fat-containing plasticizer? several different components, then these are in generally used in roughly equal parts. At least however, each of the components mentioned should be about 10 percent by weight make up the fat components of the plasticizer mixture, if any, a mixture of these compounds to Commitment comes.

The softness-improving properties of the invention Lotion are now also based on the simultaneous presence of a polysiloxane. Prefers Polydimethylsiloxanes that are substituted or carry unsubstituted alkyl, aryl or alkenyl groups and generally have no more than 10 carbon atoms. The viscosity of the polydimethylsiloxanes can vary widely Vary the range as long as the polysiloxane remains liquid or can be dissolved or dispersed in the lotion. Highly viscous Polysiloxanes that can no longer flow themselves so as part of the lotion on the tissue paper product be applied by, for example, the polysiloxane for example in polyethylene glycol or glycerin or their Dissolves mixtures and, if necessary, also emulsifies with a surfactant. Also polyether siloxanes, which are sold under the trade name Tegopren® are sold as part of the invention Lotion for making a soft tissue paper product very suitable.

The desired softening properties of the lotion However, the mechanical strength of the tissue paper product reduce in a dry or moist state. The fatty plasticizer and the polysiloxane due to their liquid consistency tend to To completely penetrate tissue paper product while doing the Binding properties of the cellulose fibers to one another weaknesses. That can last until the complete loss of Binding properties of the fibers result in the mechanical Strength would be completely lost. This Migration tendency now has the addition of the cationic quaternary ammonium salt. Because of its bipolar Structure is deposited on the surface of the tissue paper product and goes with its long hydrophobic alkyl groups Addition compounds with the hydrophobic groups of mineral oils, alkyl ethoxylates and fatty acid esters as well with the polysiloxanes. These connections are therefore through the quaternary ammonium compounds on the surface of the tissue paper product fixed and do not penetrate into it Fiber fabric. So there is also a risk of loosening Binding points of the fibers to each other eliminated. At the same time This ensures that the softening Effect causing substances on the surface of the Tissue paper product are kept and thereby their full Effect to create a silky, velvety, soft Tissue paper surface can unfold.

und der Formel III

in denen R₁ eine C₁₄ bis C₂₂ Alkylgruppe, R₂ eine C₁ bis C₆ Alkyl- oder Hydroxyalkylgruppe und R₃ eine C₁ bis C₂₀ Alkylgruppe und X ein physiologisch verträgliches Anion ist.Examples of quaternary ammonium salts which are well suited in the context of the present invention are dialkyldimethylammonium salts such as the ditallow dimethylammonium chloride, the ditallow dimethylammonium methyl sulfate, which can be partially or completely hydrogenated. Biodegradable mono- and diester derivatives of the quaternary ammonium compounds of the formula II are also very suitable

and Formula III

in which R _{1 is} a C ₁₄ to C ₂₂ alkyl group, R _{2 is} a C ₁ to C ₆ alkyl or hydroxyalkyl group and R _{3 is} a C ₁ to C ₂₀ alkyl group and X is a physiologically acceptable anion.

wobei R₄ eine Alkylgruppe mit 1 bis 6 Kohlenstoffatomen und R₅ eine

oder eine

Gruppe ist, in der R₆ eine Alkylgruppe mit 10 bis 18 Kohlenstoffatomen bedeutet und X^- ein physiologisch verträgliches Anion ist.Another group of ammonium salts which are very suitable for the tissue paper products according to the invention are quaternary imidazolinium salts of the formula IV

where R _{4 is} an alkyl group having 1 to 6 carbon atoms and R _{5 is} a

or one

Is a group in which R _{6 is} an alkyl group having 10 to 18 carbon atoms and X ^{- is} a physiologically acceptable anion.

Although the tissue paper product of the invention is both by Treatment with an aqueous or an anhydrous one Lotion can be made using the Anhydrous lotions are preferred because these only cover the surface of the tissue paper and therefore its strength cannot interfere. The tactile and surface properties of tissue paper are replaced by an anhydrous one Lotion influenced particularly favorably.

The raw tissue paper product to which the lotion is to be applied can be single-layer or multi-layer, but preferably two to four layers and have an embossed or unembossed surface. The individual paper webs can be mechanically connected to one another by edge embossing or knurling, glued flat or at certain points, or else connected to one another in some other way. For the individual webs, a basis weight range of 10 to 40 g / m ² , preferably a basis weight range between 15 and 25 g / m ^{2, has also} proven to be particularly favorable.

The lotion, which is preferably in the form of an emulsion can be used with any roller and spray application process or in an impregnation process on the Raw tissue paper product can be applied. Here is on it to ensure that there is no segregation of the emulsion is coming. Therefore, it is recommended to use high Shear forces, for example due to high-speed stirrers, frequent pumping or by ultrasonic mixing for to ensure a thorough mixing of the lotion.

The lotion according to the invention is composed such that the tissue product soaked with it during the usual application period and the normally prevailing atmospheric humidity due to its hydroscopic properties not too dehydration. Also a water vapor proof, resealable packaging is not required.

The lotion can be used in the wet part of a tissue paper machine, at the end of the wire section, in front of or within the press section or also in the dryer section arranged after the press section be added to the raw tissue paper product. Prefers is the addition of the lotion in the tissue making machine by spray application, during the reeling process apply a thin film of the lotion to the tissue paper product becomes. The already creped tissue web as a result of the previous drying process still a residual temperature between 20 and about 70 ° C, what for the distribution of the lotion and their penetration into the tissue material is favorable. Next a spray application via a nozzle bar can also Use of centrifugal rotors or brushing plants as well as the indirect transfer of a lotion film via roller applicators come into question. The order can also be placed directly on the Tissue paper web done. However, the addition is preferred the lotion inside the processing machine on the The outer layer of the multi-layer web before or during smoothing.

The present invention therefore also relates to a method for the manufacture of a tissue paper product in which the Cellulose fiber material with 0.005 to 5 percent by weight, based on the dry fiber weight of the raw tissue paper product, of the lotion described above becomes. The term tissue paper product is used according to the invention understood regardless of the fiber raw material to be used. The method according to the invention can also be used for tissue paper products apply that only partially from native pulps exist and for example also reprocessed Fibers or suitable for paper production Contain plastic fibers. It is particularly preferred as Tissue web to use a multilayer web and at least one of the outer layers of the multi-layer lotion apply. The process variant is particularly preferred, in which a smoothing by at least one Passage of the tissue web through a nip of a pair of rollers takes place in which a roller with a steel surface Counter roll with a steel, plastic, paper or Rubber surface, but preferably a plastic surface, assigned. These rollers are hydraulic or pneumatic compressed or for calibration on gap hazards. That is, one of the two rollers is firmly positioned, while the second roller is pressed against a stop, so that the two rollers cannot touch, but rather at a certain, measurable and reproducible distance to stand by each other. The tissue webs passed through this gap are compressed to the gap width and smoothed in the process. The structure of the surface is standardized, i.e. a uniform thickness is brought about.

The tissue paper product so made is as toilet paper, as a facial tissue, as a tissue or as Excellent paper towel.

The present invention is illustrated by the following exemplary embodiments explained in more detail:

Example 1:

A Rohtissuepapierbahn having a basis weight of about 18 g / m ² and a fiber dry content of about 95%, an aqueous lotion consisting perliquidum from 10 percent by weight of paraffin, 4 weight percent of the ditallow-dimethylammonium chloride and 15 weight percent of the polysiloxane Tegopren® 3021, a polyether siloxane with the Cloud point of 38 ° C, with good swirling in an amount of 4%, based on the weight of the raw tissue paper product, sprayed and subjected to post-smoothing. The application was carried out symmetrically on the outer surfaces of the finished sheet.

Example 2:

The application procedure according to Example 1 was repeated, although the lotion also contains 7.5 percent by weight Glycerin were added. It became a smooth tissue paper product with a silky-feeling surface won that such a high mechanical dry and wet strength exhibited that it was used both as a tissue and as a also excellent as toilet paper could.

Example 3

It became an anhydrous lotion by mixing 85% Paratfinum perliquidum, 10.8% Plurafac® A (a linear, 18th Alcohol containing carbon atoms, containing 27 moles of ethylene oxide was implemented), 3% of a polydimethylpolysiloxane (Dow Q2-7224) and 1.2% of a dihydrogenated Tallow dimethylammonium chloride (DTDMAC). This lotion was made in one Quantity of 2%, based on the weight of the raw tissue paper product, sprayed onto the outside of the tissue paper web. The result was a tissue paper product, which itself felt velvety soft, and high mechanical strength exhibited.

Claims (11)

Tissue paper product based on a cellulose fiber material, characterized in that it has been treated with a water-containing or water-free lotion a) up to 20 percent by weight, preferably 4 to 10 percent by weight, of a plasticizer selected from the group of mineral oils, alkyl ethoxylates or fatty acid esters or their mixtures; b) up to 5 percent by weight of a quaternary ammonium compound of the formula I.

in which two or three of the substituents R are a C ₁ to C ₆ alkyl or hydroxyalkyl radical and the other substituents R are a C ₁₄ to C ₂₂ hydrocarbon radical or a biodegradable ester group and X is a physiologically acceptable anion and c) up to 20 percent by weight of a polysiloxane. Tissue paper product according to claim 1, characterized in that the lotion additionally contains a polyhydroxy compound in an amount of up to 20 percent by weight. Tissue paper product according to claim 2, characterized in that the polyhydroxy compound has a molecular weight between 100 and 4,000, preferably between 100 and 1,000. Tissue paper product according to claims 2 and 3, characterized in that it contains glycerin, a polyethylene glycol or a polypropylene glycol, preferably dipropylene glycol, as the polyhydroxy compound. Tissue paper product according to claim 1, characterized in that it contains a hydrocarbon with 16 to 32 carbon atoms as mineral oil. Tissue paper product according to claim 1, characterized in that it contains an ester of a fatty acid having 12 to 28 carbon atoms as the fatty acid ester. Tissue paper product according to claim 1, characterized in that it is a quaternary ammonium compound as a quaternary ester-anin compound of formula II

or of formula III

wherein in the above structural formulas II and III R _{1 is} a C ₁₄ to C ₂₂ alkyl group, R _{2 is} a C ₁ to C ₆ alkyl or hydroxyalkyl group and R _{3 is} a C ₁₂ to C ₂₀ alkyl group and X ^{- is} a physiologically acceptable anion or a quaternary imidazolinium salt of the formula IV

where R _{4 is} an alkyl group having 1 to 6 carbon atoms and R _{5 is} a

or one

Is a group in which R _{6 is} an alkyl group having 10 to 18 carbon atoms and X ^{- is} a physiologically acceptable anion. Tissue paper product, characterized in that it contains as the polysiloxane a polyether siloxane or a polydimethylsiloxane, which may have a betaine group, in particular a tetraalkylammonium group, in a side chain. Lotion for the treatment of a cellulose fiber material, characterized in that it contains a) up to 20 percent by weight, preferably 4 to 10 percent by weight, of a plasticizer selected from the group of mineral oils, alkyl ethoxylates or fatty acid esters or their mixtures; b) up to 5 percent by weight of a quaternary ammonium compound of the formula I.

in which two or three of the substituents R are a C ₁ to C ₆ alkyl or hydroxyalkyl radical and the other substituents R are a C ₁₄ to C ₂₂ hydrocarbon radical or a biodegradable ester group and X is a physiologically acceptable anion and c) up to 20 percent by weight of a polysiloxane. A process for producing a tissue paper product as claimed in claims 1 to 8, characterized in that the cellulose fiber material is impregnated with 0.005 to 5% by weight, based on the dry fiber weight, of a lotion according to claim 9. Tissue paper product of claims 1 to 8, characterized in that it is used as toilet paper, facial tissue, paper towel or as a tissue.