US4666778A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Packaging film and sheet capable of forming peelable seals with good optics
Assignee: Shell USA Inc
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Filing: 1986-05-27
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Granted: 1987-05-19
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Expires: 2006-05-27
Abstract
Abstract Films or sheets are fabricated from blends of an ethylenic polymer or copolymer, a butene-1 polymer or copolymer, and a propylene polymer or copolymer which result in improved optical clarity, heat seal strength and peel seal characteristics.
Inventors
- 👤 Charles C. Hwo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:47
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/08; C08L23/0846; C08L23/0853; C08J2323/00; C08J2323/02; C08J2323/04; C08L2205/00; C08L2205/03; C08L23/10; C08L23/18; C08L23/20; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31507; Y10T428/31725; Y10T428/31739; Y10T428/31743; Y10T428/31746; Y10T428/31786; Y10T428/31797; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
120 words
A laminar structure comprising a substrate to which is bonded a film or sheet with improved clarity, which is capable of forming peel seals, having acceptable seal strengths, said film or sheet comprising a polymer mixture consisting of: from about 65 percent by weight to about 85 percent by weight of an ethylenic polymer or copolymer selected from the group consisting of linear low density polyethylene, low density polyethylene, medium density polyethylene, ethylene vinyl acetate copolymer, ethylene methyl acrylate copolymer and high density polyethylene; from about 5 percent by weight to about 30 percent by weight of the butene-1 polymer or copolymer; and from about 3 percent by weight to about 15 percent by weight of propylene polymer or copolymer.
Claim 2
Dependent Claim
120 words
A laminar structure comprising a substrate to which is bonded a film or sheet with improved clarity, which is capable of forming peel seals, having acceptable seal strengths, said film or sheet comprising a polymer mixture consisting of: from about 65 percent by weight to about 85 percent by weight of an ethylenic polymer or copolymer selected from the group consisting of linear low density polyethylene, low density polyethylene, medium density polyethylene, ethylene vinyl acetate copolymer, ethylene methyl acrylate copolymer and high density polyethylene; from about 5 percent by weight to about 30 percent by weight of the butene-1 polymer or copolymer; and from about 3 percent by weight to about 15 percent by weight of propylene polymer or copolymer.
Claim 3
Dependent Claim
63 words
The laminar structure of claim 1 which contains from about 70 percent by weight to about 80 percent by weight of said ethylenic polymer or copolymer; from about 10 percent by weight to about 25 percent by weight of said butene-1 polymer or copolymer; and from about 5 percent by weight to about 10 percent by weight of said propylene polymer or copolymer.
Claim 4
Dependent Claim
41 words
The laminar structure of claim 1 which contains: about 80 percent by weight of said ethylenic polymer or copolymer; about 15 percent by weight of said butene-1 polymer or copolymer; about 5 percent by weight of said propylene polymer or copolymer.
Claim 5
Dependent Claim
26 words
The laminar structure in claim 1, wherein said substrate is selected from the group consisting of nylon, polyester, polyvinylchloride, high density polyethylene, polypropylene, polycarbonate or polystyrene.
Claim 6
Dependent Claim
15 words
The laminar structure in claim 1, wherein said film or sheet is unoriented or oriented.
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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) | 1990-05-18 | 1990-11-17 | 1991-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-18 | 1994-11-17 | 1995-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-18 | 1998-11-17 | 1999-05-19 | $7700.00 | Window Closed / Lapsed |