USRE37248E1 - Coextruded plastic film label for in-mold labeling - Google Patents
Coextruded plastic film label for in-mold labeling Download PDFInfo
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- USRE37248E1 USRE37248E1 US08/339,615 US33961594A USRE37248E US RE37248 E1 USRE37248 E1 US RE37248E1 US 33961594 A US33961594 A US 33961594A US RE37248 E USRE37248 E US RE37248E
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- ethylene
- labels
- label
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Classifications
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
- G09F3/02—Forms or constructions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/24—Lining or labelling
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
- G09F3/04—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps to be fastened or secured by the material of the label itself, e.g. by thermo-adhesion
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/24—Lining or labelling
- B29C2049/2412—Lining or labelling outside the article
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2009/00—Layered products
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/744—Labels, badges, e.g. marker sleeves
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
- G09F3/02—Forms or constructions
- G09F2003/0223—Forms or constructions recyclable
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
- G09F3/02—Forms or constructions
- G09F2003/023—Adhesive
- G09F2003/0233—Resistance to humidity
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
- Y10T156/10—Methods of surface bonding and/or assembly therefor
- Y10T156/1052—Methods of surface bonding and/or assembly therefor with cutting, punching, tearing or severing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
- Y10T428/2813—Heat or solvent activated or sealable
- Y10T428/2817—Heat sealable
- Y10T428/2826—Synthetic resin or polymer
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31855—Of addition polymer from unsaturated monomers
- Y10T428/31909—Next to second addition polymer from unsaturated monomers
- Y10T428/31913—Monoolefin polymer
Definitions
- the present invention relates to labels, especially to labels that are particularly adapted for use in in-mold labeling of blow-mold polyethylene containers. More particularly, the present invention relates to a coextruded plastic film label for use in such in-mold labeling applications.
- blow-mold labeling of blow-mold polyethylene containers allows the manufacturer to readily and inexpensively produce labeled containers directly from the molding operation without the need to apply adhesively backed labels in a subsequent step. By eliminating subsequent handling and adhesive applying operations capital investment and handling costs are substantially reduced.
- in-mold labeling equipment requires the cooperation of various mechanical devices which operate at relatively high speeds. Labels are supplied from a magazine and individually positioned by a mechanical or vacuum operated device inside of a mold which is thereafter closed and the molded thermoplastic object prepared.
- Blow molding is a suitable molding process wherein a parison of heat plastified thermoplastic resin, most generally high density polyethylene, is extruded and then expanded to conform to the inner surface of a mold.
- the label which also must conform to the inner surface of the mold, must be held in place until contacted with the heat plastified thermoplastic resin and thereafter must become attached to the resulting object by means of a heat activated adhesive contained on the surface of the label.
- labels for use in in-mold labeling processes are required to meet demanding performance requirements.
- the labels must be sufficiently stiff that wrinkling or folding does not occur during handling by the automated equipment.
- the labels are required to be sufficiently elastic or flexible that upon attachment to the desired blow molded object they will remain adhered thereto without splitting or separating despite bending, flexing, or squeezing of the finished container.
- the container especially shampoo containers, laundry detergent containers, etc. may be exposed to high humidity or water.
- the adhesive used to adhere the label to such a container should desirably resist the effects of moisture which may lead to delamination or wrinkling of the label.
- thermoplastic scrap generated in the manufacture of coextruded films is desirably reused by recycling, i.e., regrinding and remelting, and incorporating the same into a separate inner layer of the film, it is highly desirable in the preparation of such labels that such scrap containing layer within the label not affect surface qualities of the label itself.
- thermoplastic containers it would be desirable to provide a label for in-mold labeling operations which does not have to be removed from such containers in order to recycle or regrind defective thermoplastic containers for subsequent incorporation into the thermoplastic.
- an adhesive label particularly adapted for use in the in-mold labeling of blow molded polyethylene containers comprising: (1) a heat activatable adhesive substrate layer of a polymer selected from the group consisting of (a) homopolymers of ethylene (b) copolymers of ethylene with one or more ⁇ -olefins having from 4 to 8 carbons (c) mixtures of (a) and (b) and (d) mixtures of either (a), (b) or (c) with up to about 95, preferably up to about 50 percent by weight of a copolymer of ethylene and from about 1 percent to about 30 percent by weight of a copolymerizable ethylenically unsaturated carboxylic acid or ester containing comonomer; (2) when the heat activatable adhesive substrate layer comprises (a), (b) or (c) an interlayer of a copolymer of ethylene and from about 1 percent to about 30 percent by weight of a copolymerizable ethy
- the label desirably has a 1 percent secant modulus, measured according to Americal Society of Testing Methods (ASTM) test D-882, of from about 150,000 to about 600,000 lbs/in 2 (1.034 ⁇ 10 9 to 4.136 ⁇ 10 9 Pa) and a thickness of from about 0.001 to about 0.010 inch (0.025 to about 0.25 mm).
- ASTM Americal Society of Testing Methods
- the heat activatable adhesive substrate layer of the present invention desirably comprises a polyethylene polymer.
- Suitable polyethylene polymers include high density polyethylene, low density polyethylene, linear low density polyethylene and blends thereof.
- the interlayer comprises a copolymer of ethylene and from about 1 percent to about 30 percent by weight of a copolymerizable ethylenically unsaturated carboxylic acid or ester containing comonomer.
- Preferred copolymers contain from about 5 percent to about 25 percent of the copolymerizable ethylenically unsaturated carboxylic acid or ester containing comonomer.
- the heat activatable adhesive substrate may also comprise the aforementioned polyethylene polymer blended with up to about 95 preferably up to about 50 percent by weight of a copolymer of ethylene and from about 1 percent to about 30 percent by weight of a copolymerizable ethylenically unsaturated carboxylic acid or ester containing comonomer.
- the interlayer adhered between the adhesive substrate and the surface printable substrate may be eliminated.
- amounts of carboxylic acid or ester containing comonomer greater than about 95% are employed, difficulty in film preparation and handling may be encountered.
- Copolymerizable ethylenically unsaturated carboxylic acid or ester containing comonomers for use herein include ethylenically unsaturated carboxylic acids and esters thereof having up to about 12 carbons. Examples include acrylic acid, methacrylic acid, methylmethacrylate, butyl acrylate, vinyl acetate, etc. A preferred ethylenically unsaturated carboxylic acid or ester containing comonomer is vinyl acetate.
- a preferred heat activatable adhesive substrate comprises a blend of from about 50 percent to about 75 percent of low density polyethylene and from about 50 percent to about 25 percent of a copolymer of ethylene and vinyl acetate, said copolymer containing from about 5 percent to about 25 percent vinyl acetate.
- a most preferred heat activatable adhesive substrate comprises from about 60 percent to about 70 percent low density polyethylene and from about 40 percent to about 30 percent ethylene/vinyl acetate copolymer.
- the surface printable layer comprises polystyrene, and is adapted to receive printing ink, dyes, metal films, etc. and provide a smooth defect-free surface.
- pigment or fillers are provided in order to provide a suitable background for printing, and to hide refractive index changes in the other layers of the label or any blemishes or other defects appearing in the layer of reground and recycled polymer.
- a suitable surface printable layer comprises from about 75 percent to about 98 percent by weight of polystyrene and from about 25 percent to about 2 percent by weight of a suitable pigment, or filler.
- pigments include titanium dioxide, carbon black, etc.
- Suitable fillers include calcium carbonate, silica, talc, etc.
- a particularly preferred pigment is titanium dioxide.
- the labels of the present invention additionally include a layer interposed between the adhesive substrate and the surface printable layer that comprises reground and recycled thermoplastic material employed to prepare such labels.
- a layer interposed between the adhesive substrate and the surface printable layer that comprises reground and recycled thermoplastic material employed to prepare such labels.
- Significant waste occurs in the manufacturing of films used to prepare labels both in the generation of defective films, and in cuttings and trimmings left over from sizing and die-cutting of the desired shaped films and labels. Unless such waste is able to be reground, remelted and included in the film stock, a significant economic loss is incurred.
- a scrap and regrind layer is interposed between the heat activatable adhesive substrate layer and the surface printable layer. Where the resulting structure comprises four layers it is desirable that such regrind layer be placed adjacent to the surface printable layer.
- the regrind layer may comprise up to about 50 percent by weight of reground label material with the balance comprising pigments, fillers and polystyrene. Because the reground layer may contain color bodies and have a marbled or swirled appearance the surface printable layer desirably contains sufficient pigment so as to hide or cover over such defects appearing in additional layers of the label.
- the labels of the present invention are adhered to the polyethylene blow-molded container by melt adhesion of the heat activatable adhesive substrate an exceedingly strong adhesive bond is attained between the labels of the present invention and the blow-molded container.
- This bond is unaffected by the presence of water or high humidity which may cause delamination of adhesive applied in the form of dispersions, and is also unaffected by flexing or bending of the underlying blow-molded container.
- the label of the present invention preferably has a 1 percent secant modulus of from about 200,000 to about 400,000 pounds/in 2 (1.378 ⁇ 10 9 to 2.758 ⁇ 10 9 Pa) and a thickness of from about 0.002 to about 0.005 inches (0.05 to 0.127 mm).
- any of the various layers in the label of the present invention may comprise from about 10 percent to about 50 percent of the total label thickness.
- the label of the invention may be prepared by any suitable technique such as laminating of the various layers.
- a label stock is prepared by coextrusion of the various label layers utilizing coextrusion techniques previously known in the art.
- the resins to be used in the various layers are separately heat plastified and extruded through a multi-feedblock die in the form of a thin sheet or film.
- the extrusion is in the form of a tube which is later expanded by use of compressed air or an expansion mandrel to provide a thin film comprising the various layers according to the present invention.
- the labels After cooling and slitting into a suitable width film, the labels are printed and die cut according to known techniques.
- the labels may be conveniently and economically prepared.
Abstract
A label particularly adapted for use in in-mold labeling of blow-molded polyethylene containers comprising a heat activatable ethylene polymer adhesive layer and a surface printable layer with optional intermediate layers to provide interlayer adhesion and recycle of reground labels.
Description
This application is a continuation of U.S. Ser. No. 08/049,612, filed Apr. 16, 1993, now abandoned, which is a Continuation of U.S. Ser. No. 07/706,909, filed May 20, 1991, now abandoned, and a Reissue of Ser. No. 07/049,035 filed May 11, 1987, which is a continuation-in-part of application Ser. No. 885,119 filed July 14, 1986 now abandoned.
The present invention relates to labels, especially to labels that are particularly adapted for use in in-mold labeling of blow-mold polyethylene containers. More particularly, the present invention relates to a coextruded plastic film label for use in such in-mold labeling applications.
The in-mold labeling of blow-mold polyethylene containers, particularly blow molded high density polyethylene containers allows the manufacturer to readily and inexpensively produce labeled containers directly from the molding operation without the need to apply adhesively backed labels in a subsequent step. By eliminating subsequent handling and adhesive applying operations capital investment and handling costs are substantially reduced. However, in-mold labeling equipment requires the cooperation of various mechanical devices which operate at relatively high speeds. Labels are supplied from a magazine and individually positioned by a mechanical or vacuum operated device inside of a mold which is thereafter closed and the molded thermoplastic object prepared. Blow molding is a suitable molding process wherein a parison of heat plastified thermoplastic resin, most generally high density polyethylene, is extruded and then expanded to conform to the inner surface of a mold. The label, which also must conform to the inner surface of the mold, must be held in place until contacted with the heat plastified thermoplastic resin and thereafter must become attached to the resulting object by means of a heat activated adhesive contained on the surface of the label.
The entire procedure must be carried out in a continuous and rapid manner. The supply of labels from a suitable magazine, the positioning of the label within the mold, and the blow molding procedure must proceed in an uninterrupted manner in order to attain desired economical level of operation. Accordingly, labels for use in in-mold labeling processes are required to meet demanding performance requirements. Suitably, the labels must be sufficiently stiff that wrinkling or folding does not occur during handling by the automated equipment. Contrarywise, the labels are required to be sufficiently elastic or flexible that upon attachment to the desired blow molded object they will remain adhered thereto without splitting or separating despite bending, flexing, or squeezing of the finished container.
For certain applications the container, especially shampoo containers, laundry detergent containers, etc. may be exposed to high humidity or water. The adhesive used to adhere the label to such a container should desirably resist the effects of moisture which may lead to delamination or wrinkling of the label.
A further requirement of in-mold labels is the presence of a suitable surface appearance. It is highly desirable from an esthetical and consumer acceptance point of view that the label not affect graphics or printing appearing on the surface thereof. Because thermoplastic scrap generated in the manufacture of coextruded films is desirably reused by recycling, i.e., regrinding and remelting, and incorporating the same into a separate inner layer of the film, it is highly desirable in the preparation of such labels that such scrap containing layer within the label not affect surface qualities of the label itself.
Finally, previously known in-mold labels prepared from cellulosic base stocks, such as paper, have proven undesirable in operation because the recycle of scrap blow-molded objects having such labels affixed thereto requires tedius mechanical means or solvents to first remove the labels. In order to reclaim or recycle such bottles, particularly defective bottles prepared during the blow-molding process, it is first necessary to remove the paper labels. Contamination by residual adhesive and small portions of unremoved paper may make it practically impossible to reclaim defective blow-molded containers bearing such labels. As an alternate means of disposal, defective containers must be burned or buried in landfills both of which practices are wasteful and undesirable.
It would be desirable to provide a polymeric label particularly adapted for use in in-mold labeling of blow-molded polyethylene containers.
In addition, it would be desirable to provide such a label for use in in-mold labeling which combines suitable properties of modulus of elasticity and flexibility, and at the same is adaptable to in-mold processing conditions and not degraded by flexing and handling of the subsequent container.
It would further be desirable to provide a label for use in in-mold labeling applications which is unaffected by moisture or high humidity environments.
Finally, it would be desirable to provide a label for in-mold labeling operations which does not have to be removed from such containers in order to recycle or regrind defective thermoplastic containers for subsequent incorporation into the thermoplastic.
According to the present invention there is now provided an adhesive label particularly adapted for use in the in-mold labeling of blow molded polyethylene containers comprising: (1) a heat activatable adhesive substrate layer of a polymer selected from the group consisting of (a) homopolymers of ethylene (b) copolymers of ethylene with one or more α-olefins having from 4 to 8 carbons (c) mixtures of (a) and (b) and (d) mixtures of either (a), (b) or (c) with up to about 95, preferably up to about 50 percent by weight of a copolymer of ethylene and from about 1 percent to about 30 percent by weight of a copolymerizable ethylenically unsaturated carboxylic acid or ester containing comonomer; (2) when the heat activatable adhesive substrate layer comprises (a), (b) or (c) an interlayer of a copolymer of ethylene and from about 1 percent to about 30 percent by weight of a copolymerizable ethylenically unsaturated carboxylic acid or ester containing comonomer; and (3) a surface printable layer comprising polystyrene.
The label desirably has a 1 percent secant modulus, measured according to Americal Society of Testing Methods (ASTM) test D-882, of from about 150,000 to about 600,000 lbs/in2 (1.034×109 to 4.136×109 Pa) and a thickness of from about 0.001 to about 0.010 inch (0.025 to about 0.25 mm).
In one embodiment of the invention, the heat activatable adhesive substrate layer of the present invention desirably comprises a polyethylene polymer. Suitable polyethylene polymers include high density polyethylene, low density polyethylene, linear low density polyethylene and blends thereof. In this embodiment, it is desirable to insert an interlayer between the adhesive substrate layer and the surface printable layer in order to obtain suitable adhesion therebetween. In this case, the interlayer comprises a copolymer of ethylene and from about 1 percent to about 30 percent by weight of a copolymerizable ethylenically unsaturated carboxylic acid or ester containing comonomer. Preferred copolymers contain from about 5 percent to about 25 percent of the copolymerizable ethylenically unsaturated carboxylic acid or ester containing comonomer.
As previously mentioned, the heat activatable adhesive substrate may also comprise the aforementioned polyethylene polymer blended with up to about 95 preferably up to about 50 percent by weight of a copolymer of ethylene and from about 1 percent to about 30 percent by weight of a copolymerizable ethylenically unsaturated carboxylic acid or ester containing comonomer. In such an embodiment, the interlayer adhered between the adhesive substrate and the surface printable substrate may be eliminated. When amounts of carboxylic acid or ester containing comonomer greater than about 95% are employed, difficulty in film preparation and handling may be encountered.
Copolymerizable ethylenically unsaturated carboxylic acid or ester containing comonomers for use herein include ethylenically unsaturated carboxylic acids and esters thereof having up to about 12 carbons. Examples include acrylic acid, methacrylic acid, methylmethacrylate, butyl acrylate, vinyl acetate, etc. A preferred ethylenically unsaturated carboxylic acid or ester containing comonomer is vinyl acetate.
A preferred heat activatable adhesive substrate comprises a blend of from about 50 percent to about 75 percent of low density polyethylene and from about 50 percent to about 25 percent of a copolymer of ethylene and vinyl acetate, said copolymer containing from about 5 percent to about 25 percent vinyl acetate. A most preferred heat activatable adhesive substrate comprises from about 60 percent to about 70 percent low density polyethylene and from about 40 percent to about 30 percent ethylene/vinyl acetate copolymer.
The surface printable layer comprises polystyrene, and is adapted to receive printing ink, dyes, metal films, etc. and provide a smooth defect-free surface. Generally, pigment or fillers are provided in order to provide a suitable background for printing, and to hide refractive index changes in the other layers of the label or any blemishes or other defects appearing in the layer of reground and recycled polymer. A suitable surface printable layer comprises from about 75 percent to about 98 percent by weight of polystyrene and from about 25 percent to about 2 percent by weight of a suitable pigment, or filler. Examples of pigments include titanium dioxide, carbon black, etc. Suitable fillers include calcium carbonate, silica, talc, etc. A particularly preferred pigment is titanium dioxide.
It is furthermore desirable in operation, that the labels of the present invention additionally include a layer interposed between the adhesive substrate and the surface printable layer that comprises reground and recycled thermoplastic material employed to prepare such labels. Significant waste occurs in the manufacturing of films used to prepare labels both in the generation of defective films, and in cuttings and trimmings left over from sizing and die-cutting of the desired shaped films and labels. Unless such waste is able to be reground, remelted and included in the film stock, a significant economic loss is incurred. Accordingly, in a preferred embodiment of the present invention, a scrap and regrind layer is interposed between the heat activatable adhesive substrate layer and the surface printable layer. Where the resulting structure comprises four layers it is desirable that such regrind layer be placed adjacent to the surface printable layer. The regrind layer may comprise up to about 50 percent by weight of reground label material with the balance comprising pigments, fillers and polystyrene. Because the reground layer may contain color bodies and have a marbled or swirled appearance the surface printable layer desirably contains sufficient pigment so as to hide or cover over such defects appearing in additional layers of the label.
Because the labels of the present invention are adhered to the polyethylene blow-molded container by melt adhesion of the heat activatable adhesive substrate an exceedingly strong adhesive bond is attained between the labels of the present invention and the blow-molded container. This bond is unaffected by the presence of water or high humidity which may cause delamination of adhesive applied in the form of dispersions, and is also unaffected by flexing or bending of the underlying blow-molded container.
In addition, the absence of a noncompatible adhesive costing is believed to aid in producing a compatible blend upon regrinding and remelting of scrap containers. More particularly defects such as swirls appearing in the regrind layer are reduced by eliminating such an adhesive coating.
In order to operate most smoothly in the in-mold labeling process, the label of the present invention preferably has a 1 percent secant modulus of from about 200,000 to about 400,000 pounds/in2 (1.378×109 to 2.758×109 Pa) and a thickness of from about 0.002 to about 0.005 inches (0.05 to 0.127 mm).
Generally, any of the various layers in the label of the present invention may comprise from about 10 percent to about 50 percent of the total label thickness.
The label of the invention may be prepared by any suitable technique such as laminating of the various layers. Preferably a label stock is prepared by coextrusion of the various label layers utilizing coextrusion techniques previously known in the art. Suitably, the resins to be used in the various layers are separately heat plastified and extruded through a multi-feedblock die in the form of a thin sheet or film. Alternatively, the extrusion is in the form of a tube which is later expanded by use of compressed air or an expansion mandrel to provide a thin film comprising the various layers according to the present invention. After cooling and slitting into a suitable width film, the labels are printed and die cut according to known techniques. Advantageously, because separately applied adhesive is not employed, the labels may be conveniently and economically prepared.
Claims (15)
1. A polymeric adhesive label particularly adapted for use in the in-mold labeling of blow-molded polyethylene containers comprising: (1) a heat activatable adhesive substrate layer of a polymer selected from the group consisting of (a) homopolymers of ethylene (b) copolymers of ethylene with one or more α-olefins having from 4 to 8 carbons (c) mixtures of (a) and (b) and (d) mixtures of either (a), (b) or (c) with up to 50 percent by weight of a copolymer comprising ethylene and from about 1 percent to about 30 percent by weight of a copolymerizable ethylenically unsaturated carboxylic acid or ester containing comonomer; (2) when the heat activatable adhesive substrate layer comprises (a), (b) or (c) an interlayer of a copolymer of ethylene and from about 1 percent to about 30 percent by weight of a copolymerizable ethylenically unsaturated carboxylic acid or ester containing comonomer; and (3) a surface printable layer comprising polystyrene.
2. A label according to claim 1 having a 1 percent secant modulus of from about 150,000 to about 600,000 lbs/in2 (1.034×109 to 4.136×109 Pa) and a thickness of from about 0.001 to about 0.010 inch (0.025 to about 0.25 mm).
3. A label according to claim 1 having a 1 percent secant modulus from about 200,000 to about 400,000 lb/in2 (1.378×109 to 2.758×109 Pa).
4. A label according to claim 1 having a thickness from about 0.002 to about 0.005 inches (0.05 to about 0.127 mm).
5. A label according to claim 1, wherein the heat activatable adhesive substrate comprises low density polyethylene.
6. A label according to claim 1, wherein the carboxylic acid or ester containing comonomer is vinyl acetate.
7. A label according to claim 1 additionally containing a recycle layer of ground remelted label interposed between the heat activatable adhesive substrate and the surface printable layer.
8. A label according to claim 1, wherein the surface printable layer additionally comprises from about 30 percent to about 2 percent by weight of a pigment or filler.
9. A polymeric adhesive label particularly adapted for use in the in-mold labeling of blow-molded polyethylene containers comprising: (1) a heat activatable adhesive substrate layer of a polymer selected from the group consisting of (a) homopolymers of ethylene (b) copolymers of ethylene with one or more α-olefins having from 4 to 8 carbons (c) mixtures of (a) and (b) and (d) mixtures of either (a), (b) or (c) with up to 95 percent by weight of a copolymer comprising ethylene and from about 1 percent to about 30 percent by weight of a copolymerizable ethylenically unsaturated carboxylic acid or ester containing comonomer; (2) when the heat activatable adhesive substrate layer comprises (a), (b), or (c) and interlayer of a copolymer of ethylene and from about 1 percent to about 30 percent by weight of a copolymerizable ethylenically unsaturated carboxylic acid or ester containing comonomer, and (3) a surface printable layer comprising polystyrene.
10. A method of making polymeric labels adapted for use in the in-mold labeling of blow-molded polyethylene containers, comprising the steps of:
a) coextruding a film comprised of a heat activatable adhesive substrate layer and a surface printable layer, by either (i) extruding resins to be used in the layers through a multi-feedblock die in the form of a film; or (ii) extruding a tube which is later expanded by use of compressed air or an expansion mandrel to provide a film comprising the layers;
b) slitting the film to a suitable width;
c) printing on the surface printable layer; and
d) die cutting labels from the printed film,
wherein materials for the coextruded film are selected so that the labels therefrom are unaffected by water or high humidity; are sufficiently stiff that wrinkling or folding does not occur during handling of the labels by in-mold labeling equipment; and are sufficiently elastic or flexible that upon attachment to the container the labels remain adhered thereto without splitting or separating despite bending, flexing, or squeezing of the container.
11. A method according to claim 10, wherein the heat activatable adhesive substrate layer comprises a polymer selected from the group consisting of (a) homopolymers of ethylene; (b) copolymers of ethylene with one or more α-olefins having from 4 to 8 carbons; (c) mixtures of (a) and (b); and (d) mixtures of either (a), (b), or (c) with up to 50 percent by weight of a copolymer comprising ethylene and from about 1 percent to about 30 percent by weight of a copolymerizable ethylenically unsaturated carboxylic acid or ester containing comonomer.
12. A method according to claim 10, further comprising collecting scrap label stock, regrinding the scrap, and coextruding the reground scrap as a recycle layer between the heat activatable adhesive substrate layer and surface printable layer.
13. A method according to claim 10, wherein materials for the coextruded film are selected so that the labels therefrom have a 1 percent secant modulus of from about 150,000 to about 600,000 lbs/in2.
14. A method according to claim 10, wherein materials for the coextruded film are selected so that the labels therefrom have a 1 percent secant modulus of from about 200,000 to about 400,000 lbs/in2.
15. A method according to claim 10, wherein the labels have an overall thickness of from about 0.001 to about 0.010 inches.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/339,615 USRE37248E1 (en) | 1986-07-14 | 1994-11-15 | Coextruded plastic film label for in-mold labeling |
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US88511986A | 1986-07-14 | 1986-07-14 | |
US07/049,035 US4837075A (en) | 1986-07-14 | 1987-05-11 | Coextruded plastic film label for in-mold labeling |
US70690991A | 1991-05-20 | 1991-05-20 | |
US4961293A | 1993-04-16 | 1993-04-16 | |
US08/339,615 USRE37248E1 (en) | 1986-07-14 | 1994-11-15 | Coextruded plastic film label for in-mold labeling |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US07/049,035 Reissue US4837075A (en) | 1986-07-14 | 1987-05-11 | Coextruded plastic film label for in-mold labeling |
Publications (1)
Publication Number | Publication Date |
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USRE37248E1 true USRE37248E1 (en) | 2001-06-26 |
Family
ID=27489249
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US08/339,615 Expired - Lifetime USRE37248E1 (en) | 1986-07-14 | 1994-11-15 | Coextruded plastic film label for in-mold labeling |
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Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6644613B2 (en) * | 1999-06-08 | 2003-11-11 | Pharmagraphics (Southeast), L.L.C. | Hanger label |
US20040083918A1 (en) * | 2002-11-04 | 2004-05-06 | Jack Neil C. | Method and systems for in-mold labeling of irregularly shaped products |
US20050115422A1 (en) * | 1998-04-03 | 2005-06-02 | Louviere Kent A. | Apparatus and method for imprinting a vial |
US20050214306A1 (en) * | 2002-02-28 | 2005-09-29 | Nascimento Ana L | Surface proteins of leptospira |
US7168366B2 (en) | 1998-04-03 | 2007-01-30 | Louviere Kent A | Apparatus and method for imprinting a vial |
US20070244709A1 (en) * | 2006-04-17 | 2007-10-18 | Earthworks Systems, Llc | Methods of producing and recycling plastic cards |
US20070243362A1 (en) * | 2006-04-17 | 2007-10-18 | Earthworks Systems, Llc | Sheet stock and cards made from recycled plastic scrap material and methods |
US20080264563A1 (en) * | 2007-04-26 | 2008-10-30 | Joseph Kuczynski | Apparatus and Method to Enable Easy Removal of One Substrate from Another for Enhanced Reworkability and Recyclability |
US20090162620A1 (en) * | 2007-12-20 | 2009-06-25 | Nova Chemicals (International) S.A. | Rotomolding labels |
US20100323172A1 (en) * | 2009-06-18 | 2010-12-23 | Nova Chemicals (International) S.A. | In-mold labels |
US20110111189A1 (en) * | 2008-06-27 | 2011-05-12 | Gilbert Rodd S | Polymeric sheet material and method of manufacturing same |
Citations (32)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3232789A (en) | 1960-12-22 | 1966-02-01 | Milprint Inc | Packaging materials comprising coated linear polyolefin films of improved heat-seal characteristics |
US3271255A (en) | 1962-11-30 | 1966-09-06 | Shimada Shigetoshi | Extraction process and product of holothurioidea |
US3271225A (en) * | 1963-06-26 | 1966-09-06 | Du Pont | Labeling process |
US3343663A (en) | 1965-10-24 | 1967-09-26 | Dow Chemical Co | Package and laminate thereof |
US4020228A (en) | 1974-11-11 | 1977-04-26 | W. R. Grace & Co. | Gel composition, heat sealable substrates, and process for heat sealing |
US4062712A (en) | 1975-10-24 | 1977-12-13 | Ab Ziristor | Method for making a packing laminate |
US4101047A (en) | 1975-08-22 | 1978-07-18 | Bellaplast Gmbh | Laminated material of thermoplastic synthetic material, process of making and container closed therewith |
US4101701A (en) | 1973-05-17 | 1978-07-18 | Polaroid Corporation | I.D. cards |
US4293608A (en) | 1978-10-11 | 1981-10-06 | Toyo Baseki Kabushiki Kaisha | Olefin packaging laminate |
US4337284A (en) | 1979-02-14 | 1982-06-29 | Imperial Chemical Industries Limited | Film tear-tape and packaging film having tear-tape adherent thereto |
US4359494A (en) | 1980-07-07 | 1982-11-16 | Kabushiki Kaisha Marubishi Sogyo | Flexible sheet material with raised decorative pattern |
US4380567A (en) | 1980-10-09 | 1983-04-19 | Mitsui Petrochemical Industries, Ltd. | Ethylenic composite film structure |
US4390385A (en) | 1980-05-23 | 1983-06-28 | W. R. Grace & Co., Cryovac Div. | Heat sealable, multi-ply polypropylene film |
US4393115A (en) | 1980-07-22 | 1983-07-12 | Toray Industries | Multilayered polypropylene film |
US4426422A (en) | 1977-04-13 | 1984-01-17 | Dennison Manufacturing Company | Distortion and chemically resistant heat transfer materials |
US4430135A (en) | 1981-12-04 | 1984-02-07 | Chemplex Company | Adhesive blends and methods of making composite structures |
US4444839A (en) | 1980-10-04 | 1984-04-24 | Hoechst Aktiengesellschaft | Water-soluble label, a process for its preparation and its use |
US4460632A (en) | 1982-04-26 | 1984-07-17 | Chemplex Company | Adhesive blends and composite structures |
US4497857A (en) | 1983-10-31 | 1985-02-05 | Composite Container Corporation | Flexible heat-sealable sheet and bag made therefrom |
US4501797A (en) | 1982-12-01 | 1985-02-26 | American Can Company | Unbalanced oriented multiple layer film |
US4548857A (en) | 1983-09-26 | 1985-10-22 | Dennison Manufacturing Co. | Heat transferable laminate |
US4551380A (en) | 1984-05-10 | 1985-11-05 | W. R. Grace & Co., Cryovac Div. | Oriented heat-sealable multilayer packaging film |
US4565720A (en) | 1983-07-27 | 1986-01-21 | Idemitsu Petrochemical Co., Ltd. | Packaging bag |
US4572854A (en) | 1983-02-23 | 1986-02-25 | Hoechst Aktiengesellschaft | Multilayer film with a gas and aroma barrier layer and a process for the preparation and application thereof |
US4587158A (en) | 1984-09-04 | 1986-05-06 | Ewing William D | Deformable label |
US4601926A (en) | 1985-01-24 | 1986-07-22 | Owens-Illinois, Inc. | Process for applying copolyester barrier layer on polyester container |
US4617241A (en) | 1984-01-23 | 1986-10-14 | W. R. Grace & Co., Cryovac Div. | Linear polyethylene stretch/shrink films |
US4623587A (en) | 1983-10-18 | 1986-11-18 | Idemitsu Petrochemical Co., Ltd. | Multi-layer film or sheet material |
US4650533A (en) | 1982-07-23 | 1987-03-17 | Transfer Print Foils, Inc. | Preparation of hot transfer product for continuous in-mold decoration |
US4684554A (en) | 1985-04-12 | 1987-08-04 | Minnesota Mining And Manufacturing Company | Polymeric coating for container induction innerseal |
US4704310A (en) | 1986-08-25 | 1987-11-03 | Dennison Manufacturing Company | Heat transferable laminate |
US5242650A (en) | 1991-09-09 | 1993-09-07 | Avery Dennison Corporation | In-mold labelling a coextruded, stretched and annealed label |
-
1994
- 1994-11-15 US US08/339,615 patent/USRE37248E1/en not_active Expired - Lifetime
Patent Citations (32)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3232789A (en) | 1960-12-22 | 1966-02-01 | Milprint Inc | Packaging materials comprising coated linear polyolefin films of improved heat-seal characteristics |
US3271255A (en) | 1962-11-30 | 1966-09-06 | Shimada Shigetoshi | Extraction process and product of holothurioidea |
US3271225A (en) * | 1963-06-26 | 1966-09-06 | Du Pont | Labeling process |
US3343663A (en) | 1965-10-24 | 1967-09-26 | Dow Chemical Co | Package and laminate thereof |
US4101701A (en) | 1973-05-17 | 1978-07-18 | Polaroid Corporation | I.D. cards |
US4020228A (en) | 1974-11-11 | 1977-04-26 | W. R. Grace & Co. | Gel composition, heat sealable substrates, and process for heat sealing |
US4101047A (en) | 1975-08-22 | 1978-07-18 | Bellaplast Gmbh | Laminated material of thermoplastic synthetic material, process of making and container closed therewith |
US4062712A (en) | 1975-10-24 | 1977-12-13 | Ab Ziristor | Method for making a packing laminate |
US4426422A (en) | 1977-04-13 | 1984-01-17 | Dennison Manufacturing Company | Distortion and chemically resistant heat transfer materials |
US4293608A (en) | 1978-10-11 | 1981-10-06 | Toyo Baseki Kabushiki Kaisha | Olefin packaging laminate |
US4337284A (en) | 1979-02-14 | 1982-06-29 | Imperial Chemical Industries Limited | Film tear-tape and packaging film having tear-tape adherent thereto |
US4390385A (en) | 1980-05-23 | 1983-06-28 | W. R. Grace & Co., Cryovac Div. | Heat sealable, multi-ply polypropylene film |
US4359494A (en) | 1980-07-07 | 1982-11-16 | Kabushiki Kaisha Marubishi Sogyo | Flexible sheet material with raised decorative pattern |
US4393115A (en) | 1980-07-22 | 1983-07-12 | Toray Industries | Multilayered polypropylene film |
US4444839A (en) | 1980-10-04 | 1984-04-24 | Hoechst Aktiengesellschaft | Water-soluble label, a process for its preparation and its use |
US4380567A (en) | 1980-10-09 | 1983-04-19 | Mitsui Petrochemical Industries, Ltd. | Ethylenic composite film structure |
US4430135A (en) | 1981-12-04 | 1984-02-07 | Chemplex Company | Adhesive blends and methods of making composite structures |
US4460632A (en) | 1982-04-26 | 1984-07-17 | Chemplex Company | Adhesive blends and composite structures |
US4650533A (en) | 1982-07-23 | 1987-03-17 | Transfer Print Foils, Inc. | Preparation of hot transfer product for continuous in-mold decoration |
US4501797A (en) | 1982-12-01 | 1985-02-26 | American Can Company | Unbalanced oriented multiple layer film |
US4572854A (en) | 1983-02-23 | 1986-02-25 | Hoechst Aktiengesellschaft | Multilayer film with a gas and aroma barrier layer and a process for the preparation and application thereof |
US4565720A (en) | 1983-07-27 | 1986-01-21 | Idemitsu Petrochemical Co., Ltd. | Packaging bag |
US4548857A (en) | 1983-09-26 | 1985-10-22 | Dennison Manufacturing Co. | Heat transferable laminate |
US4623587A (en) | 1983-10-18 | 1986-11-18 | Idemitsu Petrochemical Co., Ltd. | Multi-layer film or sheet material |
US4497857A (en) | 1983-10-31 | 1985-02-05 | Composite Container Corporation | Flexible heat-sealable sheet and bag made therefrom |
US4617241A (en) | 1984-01-23 | 1986-10-14 | W. R. Grace & Co., Cryovac Div. | Linear polyethylene stretch/shrink films |
US4551380A (en) | 1984-05-10 | 1985-11-05 | W. R. Grace & Co., Cryovac Div. | Oriented heat-sealable multilayer packaging film |
US4587158A (en) | 1984-09-04 | 1986-05-06 | Ewing William D | Deformable label |
US4601926A (en) | 1985-01-24 | 1986-07-22 | Owens-Illinois, Inc. | Process for applying copolyester barrier layer on polyester container |
US4684554A (en) | 1985-04-12 | 1987-08-04 | Minnesota Mining And Manufacturing Company | Polymeric coating for container induction innerseal |
US4704310A (en) | 1986-08-25 | 1987-11-03 | Dennison Manufacturing Company | Heat transferable laminate |
US5242650A (en) | 1991-09-09 | 1993-09-07 | Avery Dennison Corporation | In-mold labelling a coextruded, stretched and annealed label |
Non-Patent Citations (1)
Title |
---|
Plastics World; Author: Charles Lodge; Title: In-mold labeling: next value-added for blow molders; Aug. 1984; pp. 45-47. |
Cited By (17)
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US7389725B2 (en) | 1998-04-03 | 2008-06-24 | Louviere Kent A | Apparatus and method for imprinting a vial |
US20050115422A1 (en) * | 1998-04-03 | 2005-06-02 | Louviere Kent A. | Apparatus and method for imprinting a vial |
US7124681B2 (en) | 1998-04-03 | 2006-10-24 | Louviere Kent A | Apparatus and method for imprinting a vial |
US7168366B2 (en) | 1998-04-03 | 2007-01-30 | Louviere Kent A | Apparatus and method for imprinting a vial |
US20070095219A1 (en) * | 1998-04-03 | 2007-05-03 | Louviere Kent A | Apparatus and method for imprinting a vial |
US6644613B2 (en) * | 1999-06-08 | 2003-11-11 | Pharmagraphics (Southeast), L.L.C. | Hanger label |
US20050214306A1 (en) * | 2002-02-28 | 2005-09-29 | Nascimento Ana L | Surface proteins of leptospira |
US20040083918A1 (en) * | 2002-11-04 | 2004-05-06 | Jack Neil C. | Method and systems for in-mold labeling of irregularly shaped products |
US7005094B2 (en) * | 2002-11-04 | 2006-02-28 | Jack Neil C | Method and systems for in-mold labeling of irregularly shaped products |
US20070244709A1 (en) * | 2006-04-17 | 2007-10-18 | Earthworks Systems, Llc | Methods of producing and recycling plastic cards |
US20070243362A1 (en) * | 2006-04-17 | 2007-10-18 | Earthworks Systems, Llc | Sheet stock and cards made from recycled plastic scrap material and methods |
US20110139332A1 (en) * | 2006-04-17 | 2011-06-16 | Earthworks System, Llc | Sheet stock and cards made from recycled plastic scrap material and methods |
US20080264563A1 (en) * | 2007-04-26 | 2008-10-30 | Joseph Kuczynski | Apparatus and Method to Enable Easy Removal of One Substrate from Another for Enhanced Reworkability and Recyclability |
US20090162620A1 (en) * | 2007-12-20 | 2009-06-25 | Nova Chemicals (International) S.A. | Rotomolding labels |
US20110111189A1 (en) * | 2008-06-27 | 2011-05-12 | Gilbert Rodd S | Polymeric sheet material and method of manufacturing same |
US20100323172A1 (en) * | 2009-06-18 | 2010-12-23 | Nova Chemicals (International) S.A. | In-mold labels |
US8334020B2 (en) | 2009-06-18 | 2012-12-18 | Nova Chemicals (International) | In-mold labels |
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