Patent US4400428A successfully refreshed from Google Patents.
US4400428A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sealable multilayer films
Assignee: Dow Produktions und Vertriebs GmbH and Co OHG
•
Filing: 1982-04-05
•
Granted: 1983-08-23
•
Expires: 2002-04-05
Abstract
Abstract A composite film comprising a polypropylene basis film being laminated at least on one surface with a layer combination of a heat sealable layer with an additive combination, an adhesion promotion layer, a gas-barrier layer, and an adhesion promotion layer and optionally a further heat sealable layer.
Inventors
- 👤 Heinrich Rosenthal
- 👤 Ingo Schinkel
- 👤 Gunter Eger
- 👤 Wolfgang Bair
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:42
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/32; B29; B29D; B29D7/00; B32B27/06; B32B27/08; B32B27/30; B32B27/306; B32B7/00; B32B7/04; B32B7/12; B32B2307/00; B32B2307/30; B32B2307/31; B32B2307/50; B32B2307/514; B32B2307/518; B32B2553/00; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/31504; Y10T428/31652; Y10T428/31667; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
249 words
A heat-sealable composite film comprising a biaxially oriented polypropylene film as a base film, said base film having two surfaces and, on at least one surface thereof is disposed, a layer combination which comprises (A) a heat-sealable outer layer of polyethylene or of an ethylene copolymer containing at least 3% by weight of ethylene; (B) an adhesion-promoting layer of modified polyolefin; (C) gas-barrier layer of hydrolyzed ethylene/vinyl acetate copolymer containing from 50 to 80 mole percent of vinyl acetate units of which at least 90% are hydrolyzed; (D) an adhesion-promoting layer of modified polyolefin; and (E) a layer of polyethylene or of an ethylene copolymer containing at least 3% by weight of ethylene; each of the two layers A and B or D and E or layers B and C or C and D are combinable into one single layer by mixing the corresponding polymers; layer A containing an additive combination comprising (a) from 0.3 to 1% by weight, based on the sealable layer, of a long-chain aliphatic amine, (b) from 0.1 to 0.7% by weight, based on the sealable layer, of a dispersed thermoplastic polymer which is incompatible with the polyethylene or ethylene copolymer and which has a softening point at most 50° C. below or above the softening point of the polyethylene or ethylene copolymer, and (c) from 0.1 to 1.2% by weight, based on the sealable layer, of a polydialkyl siloxane having a viscosity of between about 10 5 and 10 6 m.Pa.s at 20° C.
Claim 2
Dependent Claim
249 words
A heat-sealable composite film comprising a biaxially oriented polypropylene film as a base film, said base film having two surfaces and, on at least one surface thereof is disposed, a layer combination which comprises (A) a heat-sealable outer layer of polyethylene or of an ethylene copolymer containing at least 3% by weight of ethylene; (B) an adhesion-promoting layer of modified polyolefin; (C) gas-barrier layer of hydrolyzed ethylene/vinyl acetate copolymer containing from 50 to 80 mole percent of vinyl acetate units of which at least 90% are hydrolyzed; (D) an adhesion-promoting layer of modified polyolefin; and (E) a layer of polyethylene or of an ethylene copolymer containing at least 3% by weight of ethylene; each of the two layers A and B or D and E or layers B and C or C and D are combinable into one single layer by mixing the corresponding polymers; layer A containing an additive combination comprising (a) from 0.3 to 1% by weight, based on the sealable layer, of a long-chain aliphatic amine, (b) from 0.1 to 0.7% by weight, based on the sealable layer, of a dispersed thermoplastic polymer which is incompatible with the polyethylene or ethylene copolymer and which has a softening point at most 50° C. below or above the softening point of the polyethylene or ethylene copolymer, and (c) from 0.1 to 1.2% by weight, based on the sealable layer, of a polydialkyl siloxane having a viscosity of between about 10 5 and 10 6 m.Pa.s at 20° C.
Claim 3
Dependent Claim
30 words
A composite film as claimed in claim 1, wherein component (a) is a tertiary amine having a C 12 -C 18 aliphatic radical and two hydroxyalkyl-(C 1 -C 4 )-groups.
Claim 4
Dependent Claim
17 words
A composite film as claimed in claim 2, wherein component (a) is N,N-bis-(2-hydroxyethyl)-C 12 -C 16 -alkylamines.
Claim 5
Dependent Claim
16 words
A composite film as claimed in claim 1, wherein component (b) is an ethylene/methacrylic acid copolymer.
Claim 6
Dependent Claim
33 words
A composite film as claimed in claim 4, wherein component (b) is at least partly in the form of a moiety selected from the group consisting of a metal salt and polylauric lactamide.
Claim 7
Dependent Claim
27 words
A composite film as claimed in claim 1, wherein the modified polyolefin of layer B is a polypropylene or polyethylene containing grafted unit of α,β-mono-unsaturated dicarboxylic acids.
Claim 8
Dependent Claim
27 words
A composite film as claimed in claim 6, wherein the modified polyolefin is a polypropylene or polyethylene containing grafted unit of maleic acid or maleic acid anhydride.
Claim 9
Dependent Claim
37 words
A composite film as claimed in claim 1, wherein the polymer of layer C is a hydrolyzed ethylene/vinyl acetate copolymer containing from 60 to 75 mole percent vinyl acetate units of which more than 95% are hydrolyzed.
Claim 10
Dependent Claim
16 words
A composite film as claimed in claim 1, wherein layer B and layer D are identical.
Claim 11
Dependent Claim
15 words
A composite film as claimed in claim 1, wherein layer A and E are identical.
Claim 12
Dependent Claim
14 words
A package comprising material wrapped in a composite film as claimed in claim 1.
Claim 13
Dependent Claim
14 words
A package as claimed in claim 11, wherein the wrapped material is a foodstuff.
Claim 14
Dependent Claim
17 words
A composite film as claimed in claim 1, wherein said layer combination is at least monoaxially oriented.
Claim 15
Dependent Claim
58 words
A composite film as claimed in claim 1, wherein on the other surface of the base film not containing the layer combination is disposed a layer A, a layer combination of layer A to layer E or layer B and layer C or one layer of a polymer mixture of the polymers of the layers B and C.
Claim 16
Dependent Claim
14 words
A composite film as claimed in claim 1, wherein component (c) is polydimethyl siloxane.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-08-22 | 1987-02-21 | 1987-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-22 | 1991-02-21 | 1991-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-22 | 1995-02-21 | 1995-08-23 | $7700.00 | Window Closed / Lapsed |