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US4690865A
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Heat-shrinkable polymeric barrier film
Assignee: Bemis Clysar Inc
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Filing: 1986-04-28
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Granted: 1987-09-01
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Expires: 2006-04-28
Abstract
Abstract A heat-shrinkable barrier film comprised of an oriented polyolefin film coated on one side with a vinylidene chloride copolymer are disclosed. The films have excellent gas and vapor barrier properties, can surprisingly be made using conventional dispersion coating techniques, and retain acceptable optical properties even on shrinking up to as high as 35% in either transverse or machine directions or both.
Inventors
- 👤 Dan S. C. Fong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:34
CPC Classifications
B; B29; B29C; B29C61/00; B29C61/06; B29C61/0608; B29C61/0616; C; C08; C08J; C08J7/00; C08J7/04; C08J7/0427; C08J7/043; C08J7/046; C08J7/048; B29K; B29K2023/00; B29K2027/00; C08J2323/00; C08J2323/02; C08J2427/00; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10S428/913; Y10T; Y10T428/00; Y10T428/27; Y10T428/273; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192; Y10T428/31928
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
41 words
A heat-shrinkable barrier film consisting essentially of an oriented, shrinkable polyolefin film coated on at least one side with a vinylidene chloride copolymer which film is capable of shrinking at least 10% in either the machine or transverse directions, or both.
Claim 2
Dependent Claim
41 words
A heat-shrinkable barrier film consisting essentially of an oriented, shrinkable polyolefin film coated on at least one side with a vinylidene chloride copolymer which film is capable of shrinking at least 10% in either the machine or transverse directions, or both.
Claim 3
Dependent Claim
19 words
A film of claim 1 wherein the vinylidene chloride copolymer contains about 85% to 96% by weight vinylidene chloride.
Claim 4
Dependent Claim
19 words
A film of claim 2 wherein the vinylidene chloride copolymer contains about 88 to 92% by weight vinylidene chloride.
Claim 5
Dependent Claim
21 words
A film of claim 1 in which the polyolefin film is a film of propylyene/ethylene copolymer containing 1 to 4% ethylene.
Claim 6
Dependent Claim
23 words
A film of claim 1 in which the surface energy of the polyolefin film prior to coating is about 40 to 55 dynes/cm.
Claim 7
Dependent Claim
23 words
A film of claim 1 in which the weight of the vinylidene chloride copolymer coating is about 1 to 10 g/m 2 .
Claim 8
Dependent Claim
23 words
A film of claim 6 in which the weight of the vinylidene chloride copolymer coating is about 2.5 to 5 g/m 2 .
Claim 9
Dependent Claim
50 words
A film of claim 1 in which the polyolefin film is a film of propylene/ethylene copolymer containing 1 to 4% ethylene, the vinylidene chloride copolymer contains about 88 to 92% by weight vinylidene chloride, and the weight of vinylidene chloride copolymer coating is about 2.5 to 5 g/m 2 .
References Cited (Backward Citations)
GB1591424A
Cited
GB1591423A
Cited
FR2450205A1
Cited
US4424243A
Cited
US4565743A
Cited
US4605460A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-08-31 | 1991-03-02 | 1991-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-31 | 1995-03-02 | 1995-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-31 | 1999-03-02 | 1999-09-01 | $7700.00 | Window Closed / Lapsed |