US3637418A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyolefin articles having effective oxygen barriers
Assignee: Eastman Kodak Co
•
Filing: 1969-10-13
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Granted: 1972-01-25
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Expires: 1989-10-13
Abstract
Abstract Laminated polyolefin articles can be manufactured by applying two overcoat layers. 1. The first overcoat layer, in contact with the polyolefin, is of a film-forming materials selected from the group consisting of maleated polyethylene and vinyl ether/maleic anhydride copolymers. 2. The second layer, applied over the first overcoat layer is of a material selected from the group consisting of poly(vinyl alcohols), poly(vinylidene chlorides) and chemically hardened gelatin. The resulting articles have very low permeability to gases such as oxygen.
Inventors
- 👤 Billy R Dotson
- 👤 Robert F Williams Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:41
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/04; C08J7/042; C08J7/048; C08J2323/00; C08J2323/02; C08J2323/10; C08J2323/12; C08J2423/00; C08J2423/02; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/269
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
27 words
THE FIRST OVERCOAT LAYER, IN CONTACT WITH THE POLYOLEFIN, IS OF A FILM-FORMING MATERIALS SELECTED FROM THE GROUP CONSISTING OF MALEATED POLYETHYLENE AND VINYL ETHER/MALEIC ANLYDRIDE COPOLYMERS.
Claim 2
Dependent Claim
27 words
THE FIRST OVERCOAT LAYER, IN CONTACT WITH THE POLYOLEFIN, IS OF A FILM-FORMING MATERIALS SELECTED FROM THE GROUP CONSISTING OF MALEATED POLYETHYLENE AND VINYL ETHER/MALEIC ANLYDRIDE COPOLYMERS.
Claim 3
Dependent Claim
39 words
THE SECOND LAYER, APPLIED OVER THE FIRST OVERCOAT LAYER IS OF A MATERIAL SELECTED FROM THE GROUP OCNSISTING OF POLY(VINYL ALCOHOLS), POLY(VINYLIDENCE CHLORIDES) AND CHEMICALLY HARDENED GELATIN. THE RESULTING ARTICLES HAVE VERY LOW PERMEABLITY TO GASES SUCH AS OXYGEN.
Claim 4
Dependent Claim
39 words
THE SECOND LAYER, APPLIED OVER THE FIRST OVERCOAT LAYER IS OF A MATERIAL SELECTED FROM THE GROUP OCNSISTING OF POLY(VINYL ALCOHOLS), POLY(VINYLIDENCE CHLORIDES) AND CHEMICALLY HARDENED GELATIN. THE RESULTING ARTICLES HAVE VERY LOW PERMEABLITY TO GASES SUCH AS OXYGEN.
Claim 5
Dependent Claim
29 words
A polyolefin article as in claim 1, wherein said polyolefin is polyethylene and said article has at least one thin wall that is at most about 50 mils thick.
Claim 6
Dependent Claim
28 words
A polyethylene article as in claim 2, wherein said first layer consists essentially of said maleated polyethylene and said second layer consists essentially of said chemically hardened gelatin.
Claim 7
Dependent Claim
20 words
A polyethylene article as in claim 3, wherein said chemically hardened gelatin is the reaction product of gelatin and formaldehyde.
Claim 8
Dependent Claim
28 words
A polyethylene article as in claim 2, wherein said first layer consists essentially of said maleated polyethylene and said second layer consists essentially of a film-forming polyvinyl alcohol.
Claim 9
Dependent Claim
31 words
A polyethylene article as in claim 2, wherein said first layer consists essentially of said vinyl methyl ether/maleic anhydride copolymer and said second layer consists essentially of a film-forming polyvinyl alcohol.
Claim 10
Dependent Claim
28 words
A polyethylene article as in claim 2, wherein said first layer consists essentially of said maleated polyethylene and said second layer consists essentially of a film-forming poly(vinylidene chloride).
Claim 11
Dependent Claim
30 words
A polyethylene article as in claim 2, wherein said first layer consists essentially of said vinyl methyl ether/maleic anhydride copolymer, and said second layer consists essentially of chemically hardened gelatin.
Claim 12
Dependent Claim
19 words
A polyethylene article as in claim 8, wherein said hardened gelatin is the reaction product of gelatin and formaldehyde.
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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) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |