Patent US4142021A successfully refreshed from Google Patents.
US4142021A
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Oxygen barrier laminate films including a polyalkylene carbonate adhesive
Assignee: PAC POLYMER Inc A CORP OF
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Filing: 1977-06-01
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Granted: 1979-02-27
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Expires: 1997-06-01
Abstract
Abstract Laminate structures having excellent barrier properties to moisture and oxygen vapor transmission comprising a base layer and an adhesive barrier layer of a polyalkylene carbonate, typically of the type formed by reacting an epoxide with carbon dioxide, are shown.
Inventors
- 👤 Dale D. Dixon
- 👤 Michael E. Ford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:44
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/36; B32B27/32; B32B7/00; B32B7/04; B32B7/12; C; C09; C09J; C09J7/00; C09J7/30; C09J7/35; B32B2307/00; B32B2307/70; B32B2307/724; B32B2307/7242; B32B2307/7244; B32B2307/7246; B32B2307/732; B32B2307/734; B32B2553/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31507; Y10T428/31678; Y10T428/31692; Y10T428/31786; Y10T428/31797; Y10T428/31855; Y10T428/3188; Y10T428/31884; Y10T428/31895
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
127 words
In a laminate structure comprising a base layer and a polycarbonate layer bonded to the base layer, the improvement wherein the polycarbonate layer is an adhesive barrier layer and the polyalkylene carbonate is represented by the formula: ##STR3## R 1 is hydrogen, a halomethyl group or hydrocarbyl group having from 1 to 6 carbon atoms; R 3 is hydrogen, a halomethyl group, or a hydrocarbyl group having from 1 to 6 carbon atoms; R 2 and R 4 are hydrogen, or hydrocarbyl groups having from 1 to 6 carbon atoms; or R 1 , r 2 , r 3 and R 4 are combined together constituting a carbocyclic ring having from 4 to 7 carbon atoms; and n is a number from about 250 to about 6,500.
Claim 2
Dependent Claim
127 words
In a laminate structure comprising a base layer and a polycarbonate layer bonded to the base layer, the improvement wherein the polycarbonate layer is an adhesive barrier layer and the polyalkylene carbonate is represented by the formula: ##STR3## R 1 is hydrogen, a halomethyl group or hydrocarbyl group having from 1 to 6 carbon atoms; R 3 is hydrogen, a halomethyl group, or a hydrocarbyl group having from 1 to 6 carbon atoms; R 2 and R 4 are hydrogen, or hydrocarbyl groups having from 1 to 6 carbon atoms; or R 1 , r 2 , r 3 and R 4 are combined together constituting a carbocyclic ring having from 4 to 7 carbon atoms; and n is a number from about 250 to about 6,500.
Claim 3
Dependent Claim
16 words
The laminate structure of claim 1 wherein the base layer is thermally formable and heat sealable.
Claim 4
Dependent Claim
13 words
The laminate structure of claim 2 wherein the base layer is a polyolefin.
Claim 5
Dependent Claim
24 words
The laminate structure of claim 3 wherein the polyolefin base layer is selected from the group consisting of polyethylene and polypropylene or copolymers thereof.
Claim 6
Dependent Claim
13 words
The laminate structure of claim 1 wherein said base layer is dimensionally stable.
Claim 7
Dependent Claim
25 words
The laminate structure of claim 5 wherein said base layer is selected from the group consisting of regenerated cellulose, polyamide, aluminum foil, paper, and polyester.
Claim 8
Dependent Claim
17 words
The laminate structure of claim 4 wherein R 2 and R 4 of said polycarbonate are hydrogen.
Claim 9
Dependent Claim
20 words
The laminate structure of claim 7 wherein R 1 is selected from hydrogen and methyl, and R 3 is hydrogen.
Claim 10
Dependent Claim
20 words
The laminate structure of claim 8 wherein the molecular weight of the barrier layer is from about 50,000 to 150,000.
Claim 11
Dependent Claim
82 words
A laminate structure having excellent oxygen and moisture vapor barrier properties comprising: a base layer selected from the group consisting of polyvinyl chloride, polyethylene, polypropylene, regenerated cellulose, paper, polyamide, polyester, aluminum foil, polystyrene and ionomer; and an adhesive barrier layer of a polyalkylene carbonate bonded to said base layer, said polycarbonate formed by reacting carbon dioxide and an epoxide selected from the group consisting of ethylene oxide and propylene oxide, said polycarbonate having a molecular weight of from 50,000 to about 150,000.
Claim 12
Dependent Claim
82 words
A laminate structure having excellent oxygen and moisture vapor barrier properties comprising: a base layer selected from the group consisting of polyvinyl chloride, polyethylene, polypropylene, regenerated cellulose, paper, polyamide, polyester, aluminum foil, polystyrene and ionomer; and an adhesive barrier layer of a polyalkylene carbonate bonded to said base layer, said polycarbonate formed by reacting carbon dioxide and an epoxide selected from the group consisting of ethylene oxide and propylene oxide, said polycarbonate having a molecular weight of from 50,000 to about 150,000.
Claim 13
Dependent Claim
21 words
The laminate structure of claim 10 which includes a dimensionally stable top layer applied to the surface of said polyalkylene carbonate.
Claim 14
Dependent Claim
37 words
The laminate structure of claim 11 wherein said base layer is selected from the group consisting of polyethylene and polypropylene, and said top coat is selected from the group consisting of regenerated cellulose, polyamide, polyester, and paper.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-02-26 | 1982-08-28 | 1983-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-26 | 1986-08-28 | 1987-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-26 | 1990-08-28 | 1991-02-27 | $7700.00 | Window Closed / Lapsed |