US4284671A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyester compositions for gas and moisture barrier materials
Assignee: Clopay Plastic Products Co Inc
•
Filing: 1979-05-11
•
Granted: 1981-08-18
•
Expires: 1999-05-11
Abstract
Abstract Polymer blends of a polyester and polyvinyl alcohol, or their copolymers, may be fabricated into barrier packaging materials having very low permeabilities to oxygen, other fixed gases and moisture.
Inventors
- 👤 Leopoldo V. Cancio
- 👤 Gerald W. Miller
- 👤 Pai-Chuan Wu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:09
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/18; B32B27/22; B32B27/30; B32B27/306; B32B27/36; B32B3/00; B32B3/26; C; C08; C08L; C08L67/00; C08L67/02; B32B2270/00; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1379; Y10T428/31504; Y10T428/31786; Y10T428/3179; Y10T442/00; Y10T442/20; Y10T442/2213
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
36 words
A gas and moisture barrier material fabricated into a structural layer comprising a polymer blend which consists essentially of (a) a polymer selected from the group of a polyester and copolymers thereof, and (b) poly(ethylene/vinyl alcohol).
Claim 2
Dependent Claim
36 words
A gas and moisture barrier material fabricated into a structural layer comprising a polymer blend which consists essentially of (a) a polymer selected from the group of a polyester and copolymers thereof, and (b) poly(ethylene/vinyl alcohol).
Claim 3
Dependent Claim
21 words
The barrier material of claim 1 wherein the poly(ester) is selected from the group consisting of poly(ethylene terephthalate) and poly(butylene terephthalate).
Claim 4
Dependent Claim
19 words
The barrier material of claim 1 wherein said copolymer is made from terephthalic acid, ethylene glycol and cyclohexane dimethanol.
Claim 5
Dependent Claim
22 words
The barrier material of claim 3 wherein said poly(ethylene/vinyl alcohol) is in an amount from at least about 40 percent by weight.
Claim 6
Dependent Claim
41 words
The barrier material of claim 1 wherein said polyvinyl alcohol copolymer is present in an amount of at least about 10 percent by weight of said polyester and the polyester is less than about 90 percent by weight of the blend.
Claim 7
Dependent Claim
23 words
The barrier material of claim 5 wherein said polyvinyl alcohol copolymer has a weight percent of vinyl alcohol greater than about 60 percent.
Claim 8
Dependent Claim
18 words
The composition of claim 1 further comprising a plasticizer for the polymer blend in an effective plasticizing amount.
Claim 9
Dependent Claim
14 words
The composition of claim 7 wherein said plasticizer is an ester of phthalic acid.
Claim 10
Dependent Claim
28 words
A barrier material comprising a polymer blend of claim 1 fabricated into a structural layer and further comprising an additional structural layer consisting essentially of another thermoplastic polymer.
Claim 11
Dependent Claim
26 words
The barrier material of claim 9 wherein said thermoplastic polymer is selected from the group consisting of a polyolefin, a polyvinyl chloride polymer and copolymers thereof.
Claim 12
Dependent Claim
24 words
The barrier material of claim 1 which is extrusion coated onto a porous substrate for decreasing the moisture and gas permeability of the substrate.
Claim 13
Dependent Claim
23 words
The barrier material of claim 11 wherein said substrate is selected from the group consisting of a paper and a nonwoven fabric material.
Claim 14
Dependent Claim
19 words
A container formed from a layer of barrier material defined in claims 1, 2, 3, 4, 6 or 7.
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) | 1984-08-17 | 1985-02-16 | 1985-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-17 | 1989-02-16 | 1989-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-17 | 1993-02-16 | 1993-08-18 | $7700.00 | Window Closed / Lapsed |