US4842930A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat-sealable multi-layer films of polyolefins
Assignee: Dow Produktions und Vertriebs GmbH and Co OHG
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Filing: 1987-07-13
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Granted: 1989-06-27
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Expires: 2007-07-13
Abstract
Abstract Heat-sealable, at least monoaxially orientated multi-layer film of a base layer of a polypropylene and at least one heat-sealable layer of 1. 35 to 70% by weight, preferably 38 to 60% by weight, of olefin polymers of (A) at least one terpolymer consisting of (a) 65 to 82% by weight of propylene, (b) 25 to 14% by weight of butene-1, (c) 10 to 4% by weight of ethylene, and (B) 0 to 7% by weight of a copolymer of ethylene and butene-1, wherein the sum of (A) and (B) or of (a) to (c) must always give 100% by weight and the monomer content of components (A) and (B) must always give 65 to 82% by weight of propylene, 25 to 14% by weight of butene-1 and 10 to 4% by weight of ethylene, 2. 65 to 30% by weight, preferably 62 to 40% by weight, of a propylene/ethylene copolymer with 2 to 6% by weight of ethylene, wherein the sum of 1. and 2. must always give 100% by weight, and 3. if appropriate customary auxiliaries and additives.
Inventors
- 👤 Ingo Schinkel
- 👤 Jurgen Bohner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:54
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/32; B32B27/06; B32B27/08; B32B27/18; B32B27/30; B32B27/306; C; C08; C08J; C08J3/00; C08J3/12; C08J3/14; C08L; C08L23/00; C08L23/02; C08L23/10; C08L23/14; C08L23/142; C09; C09J; C09J123/00; C09J123/02; C09J123/10; C09J123/14; C09J123/142; B29; B29K; B29K2995/00; B29K2995/0018; B29K2995/0022; B32B2250/00; B32B2250/24; B32B2250/246; B32B2307/00; B32B2307/30; B32B2307/31; B32B2307/40; B32B2307/41; B32B2307/70; B32B2307/724; B32B2307/7242; B32B2323/00; B32B2323/10; B32B2331/00; B32B2331/04; B32B2439/00; B32B2439/70; C08L2205/00; C08L2205/02; C08L2666/00; C08L2666/02; C08L2666/04; Y; Y10; Y10T; Y10T428/00; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
154 words
A heat-sealable, at least monoaxailly oriented multi-layer film of a base layer of a polypropylene and at least one heat-sealable layer of an olefin polymer, the heat-sealable layer consisting essentially of (I) 35 to 70% by weight of an olefin polymer of (A) at least one terpolymer consisting of (a) 65 to 82% by weight of propylene, (b) 25 to 14% by weight of but-1-ene, (c) 10 to 4% by weight of ethylene, and (B) 0 to 7% by weight of a copolymer of ethylene and butene-1, the sum of (A) and (B) or of (a), (b) and (c) equalling 100% by weight and the monomer content of components A) and B) comprising 65 to 82% by weight of propylene, 25 to 14% by weight of butene-1 and 10 to 4% by weight of ethylene, and (II) 65 to 30% by weight of a propylene/ethylene copolymer with 2 to 6% by weight of ethylene.
Claim 2
Dependent Claim
154 words
A heat-sealable, at least monoaxailly oriented multi-layer film of a base layer of a polypropylene and at least one heat-sealable layer of an olefin polymer, the heat-sealable layer consisting essentially of (I) 35 to 70% by weight of an olefin polymer of (A) at least one terpolymer consisting of (a) 65 to 82% by weight of propylene, (b) 25 to 14% by weight of but-1-ene, (c) 10 to 4% by weight of ethylene, and (B) 0 to 7% by weight of a copolymer of ethylene and butene-1, the sum of (A) and (B) or of (a), (b) and (c) equalling 100% by weight and the monomer content of components A) and B) comprising 65 to 82% by weight of propylene, 25 to 14% by weight of butene-1 and 10 to 4% by weight of ethylene, and (II) 65 to 30% by weight of a propylene/ethylene copolymer with 2 to 6% by weight of ethylene.
Claim 3
Dependent Claim
25 words
A film according to claim 1, wherein I comprises 38 to 60% by weight and II 62 to 40% by weight of I plus II.
Claim 4
Dependent Claim
32 words
A multi-layer film according to claim 1, which is opaque wherein the base layer contains 3 to 15% by weight of at least one incompatible inorganic or organic additive in particle form.
Claim 5
Dependent Claim
25 words
A multi-layer film according to claim 1, further including a gas barrier layer of a hydrolyzed ethylene/vinyl acetate copolymer and optionally an adhesion promoter layer.
Claim 6
Dependent Claim
10 words
A foodstuff wrapped in a film according to claim 1.
Claim 7
Dependent Claim
12 words
A package of cigarettes wrapped in a film according to claim 1.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-06-26 | 1992-12-26 | 1993-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-26 | 1996-12-26 | 1997-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-26 | 2000-12-26 | 2001-06-27 | $7700.00 | Window Closed / Lapsed |