Patent US5673187A successfully refreshed from Google Patents.
Patent US4842930A successfully refreshed from Google Patents.
US4842930A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat-sealable multi-layer films of polyolefins
Assignee: Dow Produktions und Vertriebs GmbH and Co OHG
•
Filing: 1987-07-13
•
Granted: 1989-06-27
•
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 15:59
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.
References Cited (Backward Citations)
GB118060A
Cited
US948006A
Cited
GB184094A
Cited
UST948006I4
Cited
US4303708A
Cited
GB2030927A
Cited
US4339495A
Cited
US4291092A
Cited
US4275120A
Cited
US4339496A
Cited
US4339494A
Cited
US4348457A
Cited
US4400428A
Cited
US4502263A
Cited
US4675247A
Cited
DE3444158A1
Cited
US4666772A
Cited
US4643945A
Cited
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 |