US4532189A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Linear polyethylene shrink films
Assignee: Cryovac LLC
•
Filing: 1983-11-18
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Granted: 1985-07-30
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Expires: 2003-11-18
Abstract
Abstract A multi-layered thermoplastic film having improved physical characteristics is formulated through utilization of a linear low density polyethylene or linear medium density polyethylene resin as a core and/or an intermediate layer constituent.
Inventors
- 👤 Walter B. Mueller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:52
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/32; G; G02; G02B; G02B6/00; G02B6/44; G02B6/4439; G02B6/4471; G02B6/4476; B29; B29K; B29K2995/00; B29K2995/0018; B29K2995/0022; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10S428/913; Y10T; Y10T428/00; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/31504; Y10T428/31652; Y10T428/31667; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192; Y10T428/31928
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
80 words
A multi-layer film comprising: a core layer comprising linear low density polyethylene or linear medium density polyethylene; two skin layers comprising a blend of from 70% to 90%, by weight, of an ethylene propylene copolymer and from 10% to 30%, by weight, of a propylene homopolymer; and wherein said film has an average machine direction free shrink at 200° F. of at least about 12% and an average transverse direction free shrink at 200° F. of at least about 17%.
Claim 2
Dependent Claim
80 words
A multi-layer film comprising: a core layer comprising linear low density polyethylene or linear medium density polyethylene; two skin layers comprising a blend of from 70% to 90%, by weight, of an ethylene propylene copolymer and from 10% to 30%, by weight, of a propylene homopolymer; and wherein said film has an average machine direction free shrink at 200° F. of at least about 12% and an average transverse direction free shrink at 200° F. of at least about 17%.
Claim 3
Dependent Claim
33 words
The film of claim 1 further comprising two intermediate layers comprising a blend of about 90%, by weight, of an ethylene vinyl acetate copolymer and about 10%, by weight, of an ionomer resin.
Claim 4
Dependent Claim
38 words
The film of claim 1 further comprising two intermediate layers comprising a blend of from 20% to 90%, by weight, of an ethylene vinyl acetate copolymer and from 10% to 80%, by weight, of linear low density polyethylene.
Claim 5
Dependent Claim
12 words
The film of claim 1 wherein said film consists of three layers.
Claim 6
Dependent Claim
34 words
The film of claim 1 wherein said two skin layers consist essentially of a blend of about 80%, by weight, of an ethylene propylene copolymer with about 20%, by weight, of a propylene homopolymer.
Claim 7
Dependent Claim
59 words
A multi-layer film comprising: a core layer comprising linear low density polyethylene or linear medium density polyethylene; two skin layers comprising an ethylene propylene copolymer; and wherein said film has an average machine direction free shrink at 200° F. of at least about 12% and an average transverse direction free shrink at 200° F. of at least about 17%.
Claim 8
Dependent Claim
59 words
A multi-layer film comprising: a core layer comprising linear low density polyethylene or linear medium density polyethylene; two skin layers comprising an ethylene propylene copolymer; and wherein said film has an average machine direction free shrink at 200° F. of at least about 12% and an average transverse direction free shrink at 200° F. of at least about 17%.
Claim 9
Dependent Claim
31 words
The film of claim 6 further comprising two intermediate layers comprising a blend of about 90%, by weight, ethylene vinyl acetate copolymer and about 10%, by weight, of an ionomer resin.
Claim 10
Dependent Claim
37 words
The film of claim 6 further comprising two intermediate layers comprising a blend of from 20% to 90%, by weight, of an ethylene vinyl acetate copolymer and 10% to 80%, by weight, of linear low density polyethylene.
Claim 11
Dependent Claim
31 words
The film of claim 6 wherein said skin layers comprise a blend of about 80%, by weight, of an ethylene propylene copolymer with about 20%, by weight, of a propylene homopolymer.
Claim 12
Dependent Claim
203 words
The film of claims 1 or 6 wherein the core layer comprises a formulation selected from one of the following groups: a. 10-100%, by weight, of a linear low density polyethylene and from 0-90%, by weight, of an ethylene propylene copolymer; b. 10-100%, by weight, of a linear medium density polyethylene and from 0-90%, by weight, of an ethylene propylene copolymer; c. 10-80%, by weight, of a linear low density polyethylene and from 20-90%, by weight, of an ethylene vinyl acetate copolymer; d. 10-80%, by weight, of a linear medium density polyethylene and from 20-90%, by weight, of an ethylene vinyl acetate copolymer; e. 10-80%, by weight, of a linear low density polyethylene and from 10-80%, by weight, of an ethylene vinyl acetate copolymer and from 10-80%, by weight, of an ionomer resin; f. 10-80, by weight, of a linear medium density polyethylene and from 10-80%, by weight, of an ethylene vinyl acetate copolymer and from 10-80%, by weight, of an ionomer resin; g. 10-80%, by weight, of a linear low density polyethylene and from 20-90%, by weight, of a low density polyethylene; h. 10-80%, by weight, of a linear medium density polyethylene and from 20-90%, by weight, of a low density polyethylene.
Claim 13
Dependent Claim
244 words
The film of claims 1 or 6 further comprising an intermediate layer comprising a formulation selected from one of the following groups: a. 10-100%, by weight, of a linear low density polyethylene and from 0-90%, by weight, of an ethylene propylene copolymer; b. 10-100%, by weight, of a linear medium density polyethylene and from 0-90%, by weight, of an ethylene propylene copolymer; c. 10-80%, by weight, of a linear low density polyethylene and from 20-90%, by weight, of an ethylene vinyl acetate copolymer; d. 10-80%, by weight, of a linear medium density polyethylene and from 20-90%, by weight, of an ethylene vinyl acetate copolymer; e. 10-80%, by weight, of a linear low density polyethylene and from 10-80%, by weight, of an ethylene vinyl acetate copolymer and from 10-80%, by weight, of an ionomer resin; f. 10-80%, by weight of a linear medium density polyethylene and from 10-80%, by weight, of an ethylene vinyl acetate copolymer and from 10-80%, by weight, of an ionomer resin; g. 10-80%, by weight, of a linear low density polyethylene and from 20-90%, by weight, of a low density polyethylene; h. 10-80%, by weight, of a linear medium density polyethylene and from 20-90%, by weight, of a low density polyethylene; i. an ethylene vinyl acetate copolymer; j. 20-80%, by weight, linear low density polyethylene and from 20-80%, by weight, of an ionomer resin; k. 20-80%, by weight, linear medium density polyethylene and from 20-80%, by weight, of an ionomer resin.
Claim 14
Dependent Claim
12 words
The film of claim 6 wherein said film consists of three layers.
Claim 15
Dependent Claim
59 words
The film of claim 6 wherein the skin layers comprise a formulation selected from one of the following groups: a. 70-90%, by weight, of an ethylene propylene copolymer and from 10-30%, by weight, of a linear low density polyethylene; b. 70-90%, by weight, of an ethylene propylene copolymer and from 10-30%, by weight, of a linear medium density polyethylene.
Claim 16
Dependent Claim
13 words
The film of claims 1 or 6, wherein the film is heat shrinkable.
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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) | 1988-07-29 | 1989-01-28 | 1989-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-29 | 1993-01-28 | 1993-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-29 | 1997-01-28 | 1997-07-30 | $7700.00 | Window Closed / Lapsed |