US4672087A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plasticized polyvinyl alcohol compositions, forming process and formed articles
Assignee: Individual
•
Filing: 1985-03-25
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Granted: 1987-06-09
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Expires: 2005-03-25
Abstract
Abstract Formed articles made from polyvinyl alcohol having an oxygen permeability of no more than about 1 cc mil/100 in 2 24 hr atm. at 80% relative humidity, compositions suitable for use in manufacturing such articles and a process for manufacturing such articles by forming polyvinyl alcohol containing a non-hydroxyl plasticizer in a substantially water-free condition and cooling at a rate sufficiently slow to provide the enhanced impermeability, are disclosed.
Inventors
- 👤 Gerald W. Miller
- 👤 H. Harald Lutzmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:15
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/30; C; C08; C08K; C08K5/00; C08K5/0008; C08K5/0016
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
155 words
A formed polyvinyl alcohol article of manufacture consisting essentially of a mixture of (a) a polyvinyl alcohol homopolymer having a vinyl alcohol content in excess of 95%; or (b) a blend of (a) with a polyvinyl alcohol/olefin copolymer wherein the olefin has 2-4 carbon atoms and wherein (a) is at least 25% by weight of the mixture and the olefin moiety in the copolymer is not more than about 45% by weight of the copolymer; with (c) from about 4% to about 30% by weight a plasticizer selected from the group consisting of N-substituted fatty acid amides of fatty acids having from 10 to 22 carbon atoms; N-aryl, alkaryl, N-alkaryl aryl, N-aryl alkaryl, N-aryl aryl and N-alkyl alkaryl sulfonamides; aryl and alkaryl phosphates and phosphites; sulfonated alkylphenols; N-alkyl pyroolidones; alkylene carbonates and mixtures thereof, and having an oxygen permeability of less than about 1 cc/mil/100 square inches/day/atmosphere at 25 degrees C. and 80% relative humidity.
Claim 2
Dependent Claim
155 words
A formed polyvinyl alcohol article of manufacture consisting essentially of a mixture of (a) a polyvinyl alcohol homopolymer having a vinyl alcohol content in excess of 95%; or (b) a blend of (a) with a polyvinyl alcohol/olefin copolymer wherein the olefin has 2-4 carbon atoms and wherein (a) is at least 25% by weight of the mixture and the olefin moiety in the copolymer is not more than about 45% by weight of the copolymer; with (c) from about 4% to about 30% by weight a plasticizer selected from the group consisting of N-substituted fatty acid amides of fatty acids having from 10 to 22 carbon atoms; N-aryl, alkaryl, N-alkaryl aryl, N-aryl alkaryl, N-aryl aryl and N-alkyl alkaryl sulfonamides; aryl and alkaryl phosphates and phosphites; sulfonated alkylphenols; N-alkyl pyroolidones; alkylene carbonates and mixtures thereof, and having an oxygen permeability of less than about 1 cc/mil/100 square inches/day/atmosphere at 25 degrees C. and 80% relative humidity.
Claim 3
Dependent Claim
18 words
The polyvinyl alcohol article of claim 1 in which the polyvinyl alocohol/olefin copolymer is a polyvinyl alcohol/ethylene copolymer.
Claim 4
Dependent Claim
40 words
The formed polyvinyl alcohol article of claim 1 in which a plasticizer is selected from the group consisting of N-substituted fatty acid amides, alkaryl and N-alkyl alkaryl sulfonamides, sulfonated alkyl phenols, N-alkyl pyrrolidones, alkaryl phosphates, alkylene carbonates and mixtures thereof.
Claim 5
Dependent Claim
25 words
The formed polyvinyl alcohol article of claim 1 in which the plasticizer is a mixture of an N-alkyl alkaryl sulfonamide and a sulfonated alkyl phenol.
Claim 6
Dependent Claim
27 words
The formed polyvinyl alcohol article of claim 1 which has an oxygen permeability less than 0.5 cc/mil/100 square inches/day/atmosphere at 25 degrees C. and 80% relative humidity.
Claim 7
Dependent Claim
28 words
The formed polyvinyl alcohol article of claim 1 which has an oxygen permeability of less than 0.25 cc/mil/100 square inches/day/atmosphere at 25 degrees C. and 80% relative humidity.
Claim 8
Dependent Claim
28 words
The formed polyvinyl alcohol article of claim 1 which has an oxygen permeability of less than 0.1 cc/mill/100 square inches/day/atmosphere at 25 degrees C. and 80% relative humidity.
Claim 9
Dependent Claim
176 words
A melt extruded polyvinyl alcohol article of manufacture comprising a plurality of layers wherein at least one layer is composed of polyvinyl alcohol composition consisting essentially of a mixture of (a) a polyvinyl alcohol homopolymer having a vinyl alcohol content in excess of 95%; or (b) a blend of (a) with a polyvinyl alcohol/olefin copolymer wherein the olefin contains from 2 to 4 carbon atoms and wherein (a) is at least 25% by weight of the mixture and the olefin moiety in the copolymer is not more than about 45% by weight of the copolymer; with (c) from about 4% to about 30% by weight a plasticizer selected from the group consisting of N-substituted fatty acid amides in which the fatty acid contains from 10 to 22 carbon atoms; aryl, alkaryl, N-alkaryl aryl, N-aryl alkaryl, N-aryl aryl and N-alkyl alkaryl sulfonamides; aryl and alkaryl phosphates and phosphites; sulfonated alkylphenols; N-alkyl pyrrolidones; alkylene carbonates and mixtures thereof, and having an oxygen permeability of less than about 1 cc/mil/100 square inches/day/atmosphere at 25 degrees and 80% relative humidity.
Claim 10
Dependent Claim
176 words
A melt extruded polyvinyl alcohol article of manufacture comprising a plurality of layers wherein at least one layer is composed of polyvinyl alcohol composition consisting essentially of a mixture of (a) a polyvinyl alcohol homopolymer having a vinyl alcohol content in excess of 95%; or (b) a blend of (a) with a polyvinyl alcohol/olefin copolymer wherein the olefin contains from 2 to 4 carbon atoms and wherein (a) is at least 25% by weight of the mixture and the olefin moiety in the copolymer is not more than about 45% by weight of the copolymer; with (c) from about 4% to about 30% by weight a plasticizer selected from the group consisting of N-substituted fatty acid amides in which the fatty acid contains from 10 to 22 carbon atoms; aryl, alkaryl, N-alkaryl aryl, N-aryl alkaryl, N-aryl aryl and N-alkyl alkaryl sulfonamides; aryl and alkaryl phosphates and phosphites; sulfonated alkylphenols; N-alkyl pyrrolidones; alkylene carbonates and mixtures thereof, and having an oxygen permeability of less than about 1 cc/mil/100 square inches/day/atmosphere at 25 degrees and 80% relative humidity.
Claim 11
Dependent Claim
25 words
The melt extruded polyvinyl alcohol of claim 8 in which the plasticizer is a mixture of an N-alkyl alkaryl sulfonamide and a sulfonated alkyl phenol.
Claim 12
Dependent Claim
176 words
A melt extruded polyvinyl alcohol article of manufacture comprising a plurality of layers wherein at least one layer is composed of a polyvinyl alcohol composition consisting essentially of a mixture of (a) a blend of a polyvinyl alochol homopolymer having a vinyl alcohol content in excess of 95% with a polyvinyl alcohol/olefin copolymer wherein the olefin contains from 2 to 4 carbon atoms and wherein the homopolymer is at least 25% by weight of the blend and the olefin moiety in the copolymer is not more than about 45% by weight of the copolymer; with (b) from about 4% to about 30% by weight a plasticizer selected from the group consisting of N-substituted fatty acid amides in which the fatty acid contains from 10 to 22 carbon atoms; aryl, alkaryl, N-alkaryl aryl, N-aryl alkarkyl, N-aryl aryl and N-alkyl alkaryl sulfonamides; aryl and alkaryl phosphates and phosphites; sulfonated alkylphenols; N-alkyl pyrrolidones; alkylene carbonates and mixtures thereof and having an oxygen permeability of less than about 12 cc/mil/100 square inches/day/atmosphere at 25 degrees C. and 80% relative humidity.
Claim 13
Dependent Claim
176 words
A melt extruded polyvinyl alcohol article of manufacture comprising a plurality of layers wherein at least one layer is composed of a polyvinyl alcohol composition consisting essentially of a mixture of (a) a blend of a polyvinyl alochol homopolymer having a vinyl alcohol content in excess of 95% with a polyvinyl alcohol/olefin copolymer wherein the olefin contains from 2 to 4 carbon atoms and wherein the homopolymer is at least 25% by weight of the blend and the olefin moiety in the copolymer is not more than about 45% by weight of the copolymer; with (b) from about 4% to about 30% by weight a plasticizer selected from the group consisting of N-substituted fatty acid amides in which the fatty acid contains from 10 to 22 carbon atoms; aryl, alkaryl, N-alkaryl aryl, N-aryl alkarkyl, N-aryl aryl and N-alkyl alkaryl sulfonamides; aryl and alkaryl phosphates and phosphites; sulfonated alkylphenols; N-alkyl pyrrolidones; alkylene carbonates and mixtures thereof and having an oxygen permeability of less than about 12 cc/mil/100 square inches/day/atmosphere at 25 degrees C. and 80% relative humidity.
Claim 14
Dependent Claim
26 words
The melt extruded polyvinyl alcohol article of claim 10 in which the plasticizer is a mixture of an N-alkyl alkaryl sulfonamide and a sulfonated alkyl phenol.
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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) | 1990-06-08 | 1990-12-08 | 1991-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-08 | 1994-12-08 | 1995-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-08 | 1998-12-08 | 1999-06-09 | $7700.00 | Window Closed / Lapsed |