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US4668575A
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Heat sealable multilayer films with low permeability to gas and their use as packaging material
Assignee: Dow Produktions und Vertriebs GmbH and Co OHG
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Filing: 1986-05-09
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Granted: 1987-05-26
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Expires: 2006-05-09
Abstract
Abstract Heat sealable, composite film comprising a polypropylene film, at least one adhesion layer, at least one gas-barrier layer and at least one heat-sealing layer of a linear statistical ethylene copolymer of low density.
Inventors
- 👤 Ingo Schinkel
- 👤 J/u/ rgen B/o/ hner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:46
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/32; B32B27/06; B32B27/08; B32B7/00; B32B7/04; B32B7/12; C; C09; C09J; C09J123/00; C09J123/02; C09J123/04; C09J123/08; C09J123/0807; C09J123/0815; B32B2307/00; B32B2307/30; B32B2307/31; B32B2307/50; B32B2307/514; B32B2307/516; B32B2307/70; B32B2307/724; B32B2307/7242; B32B2323/00; B32B2323/10; B32B2553/00; C08; C08L; C08L2666/00; C08L2666/02; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192; Y10T428/31928
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
265 words
Heat sealable at least monoaxially orientated multilayer film consisting of propylene polymers as the base layer, on at least one surface of which a layer combination is arranged which from the outside towards the base layer, is composed of (A) a heat sealable outer layer of (a) 66.5 to 94.5% by weight of a linear statistical ethylene copolymer with a low density (LLDPE), (b) 5 to 30% by weight of a low molecular weight resin which is compatible with the LLDPE, with the exception of a low molecular weight resin of α-olefins having at most 3 C-atoms, (c) 0.3 to 2% by weight of a mixture of a polyethylene wax and an oxazoline wax, (d) 0.2 to 1.5% by weight of a polydiorgano-siloxane and (e) optionally customary additives and auxiliaries, the sum of components (a) to (d) always amounting to 100% weight, (B) optionally a layer of a propylene polymer, (C) an adhesion layer containing modified polyolefin, (D) a gas-barrier layer based on a saponified ethylene vinyl acetate copolymer containing 40 to 85 mol% of vinyl acetate units which are saponified to an extent of at least 90%, (E) an adhesion layer containing a modified polyolefin, and optionally (F) a layer of LLDPE and optionally components (b)-(e) in the above mentioned amount, the base layer optionally carrying on its other surface a sealable layer A, a layer combination A to E, a layer combination A to F or a layer combination B to D or a layer combination E and D or a layer of a mixture of the polymers of layers C and D.
Claim 2
Dependent Claim
265 words
Heat sealable at least monoaxially orientated multilayer film consisting of propylene polymers as the base layer, on at least one surface of which a layer combination is arranged which from the outside towards the base layer, is composed of (A) a heat sealable outer layer of (a) 66.5 to 94.5% by weight of a linear statistical ethylene copolymer with a low density (LLDPE), (b) 5 to 30% by weight of a low molecular weight resin which is compatible with the LLDPE, with the exception of a low molecular weight resin of α-olefins having at most 3 C-atoms, (c) 0.3 to 2% by weight of a mixture of a polyethylene wax and an oxazoline wax, (d) 0.2 to 1.5% by weight of a polydiorgano-siloxane and (e) optionally customary additives and auxiliaries, the sum of components (a) to (d) always amounting to 100% weight, (B) optionally a layer of a propylene polymer, (C) an adhesion layer containing modified polyolefin, (D) a gas-barrier layer based on a saponified ethylene vinyl acetate copolymer containing 40 to 85 mol% of vinyl acetate units which are saponified to an extent of at least 90%, (E) an adhesion layer containing a modified polyolefin, and optionally (F) a layer of LLDPE and optionally components (b)-(e) in the above mentioned amount, the base layer optionally carrying on its other surface a sealable layer A, a layer combination A to E, a layer combination A to F or a layer combination B to D or a layer combination E and D or a layer of a mixture of the polymers of layers C and D.
Claim 3
Dependent Claim
32 words
Multilayer film as claimed in claim 1, wherein layer A contains 78-89.1% by weight of component (a), 10-20% by weight of component (b), 0.5-1% of component (c), and 0.4-1% of component (d).
Claim 4
Dependent Claim
50 words
Multilayer film as claimed in claim 1, wherein the LLDPE of layer(s) A and F is a linear statistical ethylene copolymer with up to 12 mol%, preferably 2-8 mol%, of further α-olefins with C 3 to C 10 , preferably with propylene, 1-butene, pentene, hexene, octene, nonene, decene or 4-methyl-1-pentene.
Claim 5
Dependent Claim
31 words
Multilayer film as claimed in claim 3, wherein component (a) has a density lower than 0.94, preferably a density of 0.900 to 0.925, particularly preferably 0.903 to 0.92 g/cm 3 .
Claim 6
Dependent Claim
57 words
Multilayer film as claimed in claim 1, wherein as component (b) natural or synthetic resins with a softening point of 60° to 180° C. and selected from the group resin, dammar resins, turpentine resins, hydrocarbon resins, ketone resins, phenolic resins, chlorinated aliphatic or aromatic hydrocarbon resin, preferably a polycyclic hydrogenated hydrocarbon resin based on cyclopentadiene is used.
Claim 7
Dependent Claim
33 words
Multilayer film as claimed in claim 1, wherein as component (c) a mixture of a polyethylene wax and an oxazoline wax prepared from stearic acid and an amino alcohol, preferably tris-hydroxymethylaminomethane is used.
Claim 8
Dependent Claim
47 words
Multilayer film as claimed in claim 1, wherein the gas barrier layer D is based on an ethylene/vinyl acetate copolymer which consists of 60-75 mol% of vinyl acetate units which are saponified to an extent of more than 95 mol%, and optionally contain polyvinyl alcohol or polyamides.
Claim 9
Dependent Claim
132 words
Multilayer film as claimed in claim 1, wherein the layer C and E consist of homo- or copolyolefins containing carboxyl groups, preferably polypropylene or polyethylene which contain, in a grafted form, at least one monomer from the group comprising the α,β-monounsaturated dicarboxylic acids, preferably maleic acid, fumaric acid, itaconic acid or their acid anhydrides, acid esters, acid amides and acid imides; copolymers of ethylene and α,β-monounsaturated carboxylic acids, preferably acrylic acid, methacrylic acid and/or their metal salts (Zn, Na) and/or their alkyl (C 1 -C 4 ) esters; corresponding graft polymers of said monomers on polyolefins, preferably polyethylene or polypropylene; or partially saponified ethylene/vinyl acetate copolymers, which are optionally graft-polymerised with a monomer of the above mentioned unsaturated acids and have a low degree of saponification; or mixtures of the mentioned polymers.
Claim 10
Dependent Claim
43 words
Multilayer film as claimed in claim 1, wherein layers A and C and/or layers B and C and/or layers E and F or layers C and D and/or layers D and E are combined to form one layer by mixing the corresponding polymers.
Claim 11
Dependent Claim
10 words
Packaging material of multilayer films as claimed in claim 1.
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) | 1990-05-25 | 1990-11-24 | 1991-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-25 | 1994-11-24 | 1995-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-25 | 1998-11-24 | 1999-05-26 | $7700.00 | Window Closed / Lapsed |