US3900670A
Expired / Lapsed
US
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Laminated film structure
Assignee: EIDP Inc
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Filing: 1973-09-07
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Granted: 1975-08-19
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Expires: 1993-09-07
Abstract
Abstract A laminated film structure comprised of (a) a base layer of a biaxially oriented film having a cellular matrix, an inert filler dispersed therein and a surface that has a fibrous texture with surface ruptures, and laminated to at least one side of the base layer is (b) a grease-proof layer taken from the group of polymeric compositions consisting essentially of high-density polyethylene, polypropylene having a crystallinity of at least about 60%, and an ionomeric resin based on ethylene. The polymeric grease-proof layer can be stretched or unstretched. Alternatively, the film laminate can include a layer of a heatsealable composition which preferably is a polymer taken from the group consisting essentially of an ethylene-vinyl acetate resin, an ionomeric resin based on ethylene, an ethylene-vinyl acetateionomeric resin based on ethylene, and low-density polyethylene. In still another alternative embodiment, the laminated film structure can include an overcoat of a barrier coating of vinylidene chloride compolymer of a pigmented polypropylene layer to increase the opacity of the laminated film structure. These film laminates are grease-proof, making them particularly suited for packaging foodstuffs containing grease or oil such as potato chips and cookies.
Inventors
- 👤 Richard Masayoshi Ikeda
- 👤 Rudolph Henry Michel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:50
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/18; B32B27/20; B32B27/32; B32B2305/00; B32B2305/02; B32B2305/30; B32B2307/00; B32B2307/50; B32B2307/514; B32B2307/518; B32B2323/00; B32B2323/04; B32B2323/043; B32B2323/10; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249987; Y10T428/249991; Y10T428/249992; Y10T428/249993; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265
Claims Analysis
Total Claims: 44
Claim 1
Independent Claim
19 words
A FILM LAMINTE CONSISTING ESSENTIALLY OF: A. A BIAXIALLY STRETCHED THRMOPLASTIC FILM HAVING A CELLULAR POLYMER MATRIX PREPARED FROM:
Claim 2
Dependent Claim
19 words
A FILM LAMINTE CONSISTING ESSENTIALLY OF: A. A BIAXIALLY STRETCHED THRMOPLASTIC FILM HAVING A CELLULAR POLYMER MATRIX PREPARED FROM:
Claim 3
Dependent Claim
35 words
A POLYMER HAVING A CRYSTALLINITY OF AT LEAST ABOUT 60% AT ROOM TEMPERATURE TAKEN FROM THE GROUP CONSISTING OF HOMOPOLYMERS, COPOLYMERS, AND BLENDS THEREOF OF A-OLEFINS HAVING 2 TO 10 CARBON ATOMS, HAVING DISPERSED THEREIN
Claim 4
Dependent Claim
35 words
A POLYMER HAVING A CRYSTALLINITY OF AT LEAST ABOUT 60% AT ROOM TEMPERATURE TAKEN FROM THE GROUP CONSISTING OF HOMOPOLYMERS, COPOLYMERS, AND BLENDS THEREOF OF A-OLEFINS HAVING 2 TO 10 CARBON ATOMS, HAVING DISPERSED THEREIN
Claim 5
Dependent Claim
17 words
HIGH-DENSITY POLYETHYLENE WHEREIN THE DENSITY OF THE POLYMER IS FROM ABOUT 0.94 TO 0.98 G./CC. AT 25*C.,
Claim 6
Dependent Claim
17 words
HIGH-DENSITY POLYETHYLENE WHEREIN THE DENSITY OF THE POLYMER IS FROM ABOUT 0.94 TO 0.98 G./CC. AT 25*C.,
Claim 7
Dependent Claim
122 words
ABOUT 26 TO 50 WEIGHT PRECENT OF AN INERT FILLER, BASED ON THE WEIGHT OF THE POLYMER AND INERT FILLER, HAVING AN AVERAGE PARTICLE SIZE OF ABOUT 0.3 TO 8 MICRONS, WHEREIN THE FILLED POLYMER HAS AN ELONGATION OF AT LEAST ABOUT 1,000% AT A TEMPERATURE WITHIN THE RANGE WHICH IS ABOVE THE LINE DRAWING TEMPERATURE AND BELOW THE MELTING TEMPERATURE OF THE POLYMER, SAID FILM HAVING AT LEAST ABOUT 30% VOIDS, AN ELONGATION AT BREAK AT 22*C. OF AT LEAST ABOUT 8% IN EACH DIRECTION OF STRETCH AND ABOUT 2 TO 40 SURFACE RUPTURES PER SQUARE MILLIMETER, LAMINATED TO AT LEAST ONE SIDE THEREOF B. A POLYMERIC GREASE-PROOF LAYER OF ABOUT 0.5 TO 1 MIL TAKEN FROM THE GROUP CONSISTING OF:
Claim 8
Dependent Claim
122 words
ABOUT 26 TO 50 WEIGHT PRECENT OF AN INERT FILLER, BASED ON THE WEIGHT OF THE POLYMER AND INERT FILLER, HAVING AN AVERAGE PARTICLE SIZE OF ABOUT 0.3 TO 8 MICRONS, WHEREIN THE FILLED POLYMER HAS AN ELONGATION OF AT LEAST ABOUT 1,000% AT A TEMPERATURE WITHIN THE RANGE WHICH IS ABOVE THE LINE DRAWING TEMPERATURE AND BELOW THE MELTING TEMPERATURE OF THE POLYMER, SAID FILM HAVING AT LEAST ABOUT 30% VOIDS, AN ELONGATION AT BREAK AT 22*C. OF AT LEAST ABOUT 8% IN EACH DIRECTION OF STRETCH AND ABOUT 2 TO 40 SURFACE RUPTURES PER SQUARE MILLIMETER, LAMINATED TO AT LEAST ONE SIDE THEREOF B. A POLYMERIC GREASE-PROOF LAYER OF ABOUT 0.5 TO 1 MIL TAKEN FROM THE GROUP CONSISTING OF:
Claim 9
Dependent Claim
67 words
AN ETHYLENE-WAX TERPOLYMER COMPOSITION COMPRISED OF 25 T 99 WEIGHT PERCENT OF A PETROLEUM WAX AND 75 TO 1 WEIGHT PERCENT OF ATERPOLYMER OF AT LEAST 65 WEIGHT PERCENT ETHYLENE, AT LEAST 5 WEIGHT PERCENT OF AN ESTER, AN ALKYL ACRYLATE OR AN ALKYL METHACRYLATE AND ABOUT 0.1 TO 3.0 WEIGHT PERCENT OF A MONOMERICD SELECTED FROM THE GROUP OF METHACRYLIC, ACRYLIC, ITACONIC, MALEIC AND FUMARIC ACID,
Claim 10
Dependent Claim
67 words
AN ETHYLENE-WAX TERPOLYMER COMPOSITION COMPRISED OF 25 T 99 WEIGHT PERCENT OF A PETROLEUM WAX AND 75 TO 1 WEIGHT PERCENT OF ATERPOLYMER OF AT LEAST 65 WEIGHT PERCENT ETHYLENE, AT LEAST 5 WEIGHT PERCENT OF AN ESTER, AN ALKYL ACRYLATE OR AN ALKYL METHACRYLATE AND ABOUT 0.1 TO 3.0 WEIGHT PERCENT OF A MONOMERICD SELECTED FROM THE GROUP OF METHACRYLIC, ACRYLIC, ITACONIC, MALEIC AND FUMARIC ACID,
Claim 11
Dependent Claim
10 words
POLYPROPYLENE HAVING A CRYSTALLINITY OF AT LEAST ABOUT 60%, AND
Claim 12
Dependent Claim
10 words
POLYPROPYLENE HAVING A CRYSTALLINITY OF AT LEAST ABOUT 60%, AND
Claim 13
Dependent Claim
14 words
The film laminate of claim 1 wherein the polymeric, grease-proof layer is uniaxially oriented.
Claim 14
Dependent Claim
69 words
an ethylene-wax terpolymer composition comprised of 25 to 99 weight percent of a petroleum wax and 75 to 1 weight percent of a terpolymer of at least 65 weight percent ethylene, at least 5 weight percent of an ester, an alkyl acrylate or an alkyl methacrylate and about 0.1 to 3.0 weight percent of a monomeric acid selected from the group of methacrylic, acrylic, itaconic, maleic and fumaric acid,
Claim 15
Dependent Claim
69 words
an ethylene-wax terpolymer composition comprised of 25 to 99 weight percent of a petroleum wax and 75 to 1 weight percent of a terpolymer of at least 65 weight percent ethylene, at least 5 weight percent of an ester, an alkyl acrylate or an alkyl methacrylate and about 0.1 to 3.0 weight percent of a monomeric acid selected from the group of methacrylic, acrylic, itaconic, maleic and fumaric acid,
Claim 16
Dependent Claim
10 words
polypropylene having a crystallinity of at least about 60%, and
Claim 17
Dependent Claim
10 words
polypropylene having a crystallinity of at least about 60%, and
Claim 18
Dependent Claim
122 words
about 26 to 50 weight percent of an inert filler, based on the weight of the polymer and inert filler, having an average particle size of about 0.3 to 8 microns, wherein the filled polymer has an elongation of at least about 1,000% at a temperature within the range which is above the line drawing temperature and below the melting temperature of the polymer, said film having at least about 30% voids, an elongation at break at 22*C. of at least about 8% in each direction of stretch and about 2 to 40 surface ruptures per square millimeter; laminated to at least one side thereof b. a polymeric grease-proof layer of about 0.5 to 1 mil taken from the group consisting of:
Claim 19
Dependent Claim
122 words
about 26 to 50 weight percent of an inert filler, based on the weight of the polymer and inert filler, having an average particle size of about 0.3 to 8 microns, wherein the filled polymer has an elongation of at least about 1,000% at a temperature within the range which is above the line drawing temperature and below the melting temperature of the polymer, said film having at least about 30% voids, an elongation at break at 22*C. of at least about 8% in each direction of stretch and about 2 to 40 surface ruptures per square millimeter; laminated to at least one side thereof b. a polymeric grease-proof layer of about 0.5 to 1 mil taken from the group consisting of:
Claim 20
Dependent Claim
55 words
an ethylene-based ionomeric resin prepared by copolymerizing a mixture of ethylene and unsaturated monocarboxylic acid in the presence of a free radical polymerization initiator, followed by bringing the copolymer into contact with an ionizable compound to effect cross-linking forming an ionized copolymer, and c. at least one polymeric layer taken from the group consisting of:
Claim 21
Dependent Claim
55 words
an ethylene-based ionomeric resin prepared by copolymerizing a mixture of ethylene and unsaturated monocarboxylic acid in the presence of a free radical polymerization initiator, followed by bringing the copolymer into contact with an ionizable compound to effect cross-linking forming an ionized copolymer, and c. at least one polymeric layer taken from the group consisting of:
Claim 22
Dependent Claim
14 words
The film laminate of claim 1 wherein the polymeric, grease-proof layer is biaxially oriented.
Claim 23
Dependent Claim
176 words
AN ETHYLENE-BASED IONOMERIC RESIN PREPARED BY COPOLYMERIZING A MIXTURE OF ETHYLENE AND UNSATURATED MONOCARBOXYLIC ACID IN THE PRESENCE OF A FREE RADICAL POLYMERIZATION INITIATOR, FOLLOWED BY BRINGING THE COPOLYMER INTO CONTACT WITH AN IONIZABLE COMPOUND TO EFFECT CROSS-LINKING FORMING AN IONIZED COPOLYMER, AND C. AT LEAST ONE POLYMERIC LAYER TAKEN FROM THE GROUP CONSISTING OF: 1. 60 TO 70 PARTS BY WEIGHT OF ETHYLENE-VINYL ACETATE COPOLYMER HAVING AN ETHYLENE CONTENT OF 70 TO 85 WEIGHT PERCENT BASED ON THE WEIGHT OF THE COPOLYMER PRESENT, ABOUT 20 TO 25 WEIGHT PERCENT OF A WAX HAVING A MELTING POINT OF AT LEAST 60*C., ABOUT 5 TO 15 PARTS BY WEIGHT OF A DISPERSING AGENT OF SODIUM-AMMONIUM ROSINATES HAVING AT LEAST 75% AMMONIUM ROSINATE CONTENT, ABOUT 0.5 TO 5 PARTS BY WEIGHT OF AMMONIUM PROTEINATE, ABOUT 1 TO 10 PARTS BY WEIGHT OF A POLYMERIZED ROSIN ESTER AND ABOUT 0.5 TO 5 PARTS BY WEIGHT OF A STEARATE SALT OF A METAL SELECTED FROM GROUP II OF THE PERIODIC TABLE AND HAVING AN ATOMIC NUMBER BETWEEN 12 AND 30.
Claim 24
Dependent Claim
176 words
AN ETHYLENE-BASED IONOMERIC RESIN PREPARED BY COPOLYMERIZING A MIXTURE OF ETHYLENE AND UNSATURATED MONOCARBOXYLIC ACID IN THE PRESENCE OF A FREE RADICAL POLYMERIZATION INITIATOR, FOLLOWED BY BRINGING THE COPOLYMER INTO CONTACT WITH AN IONIZABLE COMPOUND TO EFFECT CROSS-LINKING FORMING AN IONIZED COPOLYMER, AND C. AT LEAST ONE POLYMERIC LAYER TAKEN FROM THE GROUP CONSISTING OF: 1. 60 TO 70 PARTS BY WEIGHT OF ETHYLENE-VINYL ACETATE COPOLYMER HAVING AN ETHYLENE CONTENT OF 70 TO 85 WEIGHT PERCENT BASED ON THE WEIGHT OF THE COPOLYMER PRESENT, ABOUT 20 TO 25 WEIGHT PERCENT OF A WAX HAVING A MELTING POINT OF AT LEAST 60*C., ABOUT 5 TO 15 PARTS BY WEIGHT OF A DISPERSING AGENT OF SODIUM-AMMONIUM ROSINATES HAVING AT LEAST 75% AMMONIUM ROSINATE CONTENT, ABOUT 0.5 TO 5 PARTS BY WEIGHT OF AMMONIUM PROTEINATE, ABOUT 1 TO 10 PARTS BY WEIGHT OF A POLYMERIZED ROSIN ESTER AND ABOUT 0.5 TO 5 PARTS BY WEIGHT OF A STEARATE SALT OF A METAL SELECTED FROM GROUP II OF THE PERIODIC TABLE AND HAVING AN ATOMIC NUMBER BETWEEN 12 AND 30.
Claim 25
Dependent Claim
42 words
an ethylene-based ionomeric resin prepared by copolymerizing a mixture of ethylene and unsaturated monocarboxylic acid in the presence of a free radical polymerization initiator followed by bringing the copolymer into contact with an ionizable compound to effect crosslinking forming an ionized copolymer,
Claim 26
Dependent Claim
42 words
an ethylene-based ionomeric resin prepared by copolymerizing a mixture of ethylene and unsaturated monocarboxylic acid in the presence of a free radical polymerization initiator followed by bringing the copolymer into contact with an ionizable compound to effect crosslinking forming an ionized copolymer,
Claim 27
Dependent Claim
42 words
AN ETHYLENE-BASED IONOMERIC RESIN PREPARED BY COPOLYMERIZING A MIXTURE OF ETHYLENE AND UNSATURATED MONOCARBOXYLIC ACID IN THE PRESENCE OF A FREE RADICAL POLYMERIZATION INITIATOR FOLLOWED BY BRINGING THE COPOLYMER INTO CONTACT WITH AN IONIZABLE COMPOUND TO EFFECT CROSSLINKING FORMING AN IONIZED COPOLYMER,
Claim 28
Dependent Claim
42 words
AN ETHYLENE-BASED IONOMERIC RESIN PREPARED BY COPOLYMERIZING A MIXTURE OF ETHYLENE AND UNSATURATED MONOCARBOXYLIC ACID IN THE PRESENCE OF A FREE RADICAL POLYMERIZATION INITIATOR FOLLOWED BY BRINGING THE COPOLYMER INTO CONTACT WITH AN IONIZABLE COMPOUND TO EFFECT CROSSLINKING FORMING AN IONIZED COPOLYMER,
Claim 29
Dependent Claim
14 words
LOW-DENSITY POLYETHYLENE WHEREIN THE DENSITY IS ABOUT 0.91 TO 0.93 G./CC. AT 25*C., AND
Claim 30
Dependent Claim
14 words
LOW-DENSITY POLYETHYLENE WHEREIN THE DENSITY IS ABOUT 0.91 TO 0.93 G./CC. AT 25*C., AND
Claim 31
Dependent Claim
14 words
low-density polyethylene wherein the density is about 0.91 to 0.93 g./cc. at 25*C., and
Claim 32
Dependent Claim
14 words
low-density polyethylene wherein the density is about 0.91 to 0.93 g./cc. at 25*C., and
Claim 33
Dependent Claim
13 words
The film laminate of claim 1 wherein the cellular polymer matrix is polyethylene.
Claim 34
Dependent Claim
13 words
The film laminate of claim 1 wherein the cellular polymer matrix is polypopylene.
Claim 35
Dependent Claim
5 words
a vinylidene chloride copolymer composition.
Claim 36
Dependent Claim
5 words
a vinylidene chloride copolymer composition.
Claim 37
Dependent Claim
5 words
A VINYLIDENE CHLORIDE COPOLYMER COMPOSITION.
Claim 38
Dependent Claim
5 words
A VINYLIDENE CHLORIDE COPOLYMER COMPOSITION.
Claim 39
Dependent Claim
29 words
The film laminate of claim 1 wherein the ethylene-based ionomeric resin is a copolymer of ethylene/10% methacrylic acid having a melt index of 1.2 and 50% neutralized with sodium.
Claim 40
Dependent Claim
43 words
The film laminate of claim 1 wherein the ethylene-wax terpolymer is comprised of 70 weight percent of a petroleum wax and 30 weight percent of a terpolymer of ethylene-vinyl acetate-methacrylic acid containing 30 weight percent vinyl acetate and 0.6 weight percent methacrylic acid.
Claim 41
Dependent Claim
24 words
THE FILM LAMINATE OF CLAIM 1 ADDITIONALLY INCLUDING AT LEAST ONE LAYER OF POLYPROPYLENE HAVING A CRYSTALLINITY GREATER THAN 60% AND CONTAINING A PIGMENT.
Claim 42
Dependent Claim
21 words
The film laminate of claim 1 wherein a grease proof layer is laminated to both sides of the cellular polymer layer.
Claim 43
Dependent Claim
15 words
The film laminate of claim 9 wherein the grease proof layers are high density polyethylene.
Claim 44
Dependent Claim
25 words
The film laminate of claim 9 wherein one grease proof layer is high density polyethylene and the second grease proof layer is ethylene-based ionomeric resin.
References Cited (Backward Citations)
US3215657A
Cited
US3264272A
Cited
US3370972A
Cited
US3539439A
Cited
US3579416A
Cited
US3799828A
Cited
US3790435A
Cited
US3765999A
Cited
US3783088A
Cited
US3741841A
Cited
US3773608A
Cited
US3758661A
Cited
US3738904A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-18 | 1979-02-17 | 1979-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-18 | 1983-02-17 | 1983-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-18 | 1987-02-17 | 1987-08-19 | $7700.00 | Window Closed / Lapsed |