Patent US3460665A successfully refreshed from Google Patents.
Patent US4611019A successfully refreshed from Google Patents.
US4611019A
Expired / Lapsed
US
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Enhanced barrier compositions from polyvinyl alcohol
Assignee: Individual
•
Filing: 1985-06-17
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Granted: 1986-09-09
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Expires: 2005-06-17
Abstract
Abstract The addition of small amounts of selected polyamides or polyesters to plasticized, melt extrudable polyvinyl alcohol homopolymer provides a composition with lower permeability to oxygen and other fixed gases.
Inventors
- 👤 H. Harald Lutzmann
- 👤 Gerald W. Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:02
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/0008; C08K5/0016; C08L; C08L29/00; C08L29/02; C08L29/04
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
141 words
A melt extrudable composition consisting essentially of a mixture of a polyvinyl alcohol homopolymer whose degree of hydrolysis is greater than 95% and having a molecular weight range which spans the solution viscosity range of 2 to 30 centipoises at 4% concentration in water at 20 degrees C., from 7 to 15% by weight based on the polyvinyl alcohol homopolymer of a plasticizer selected from the group consisting of aromatic sulfonamides, polyols, aromatic sulfonates, aromatic phosphates and phosphites, N,N-dimethyl amides of fatty acids, alkylene carbonates, alkyl pyrrolidones, and admixtures thereof, and from 0.5 to 4.5% by weight based on the weight of the polyvinyl alcohol homopolymer of a polyamide having a molecular weight of from 15,000 to 30,000 selected from the group consisting of nylon 66, nylon 6, nylon 11, nylon 12, nylon 6,10 copolymer, nylon 6,12 copolymer and grafted nylon.
Claim 2
Dependent Claim
141 words
A melt extrudable composition consisting essentially of a mixture of a polyvinyl alcohol homopolymer whose degree of hydrolysis is greater than 95% and having a molecular weight range which spans the solution viscosity range of 2 to 30 centipoises at 4% concentration in water at 20 degrees C., from 7 to 15% by weight based on the polyvinyl alcohol homopolymer of a plasticizer selected from the group consisting of aromatic sulfonamides, polyols, aromatic sulfonates, aromatic phosphates and phosphites, N,N-dimethyl amides of fatty acids, alkylene carbonates, alkyl pyrrolidones, and admixtures thereof, and from 0.5 to 4.5% by weight based on the weight of the polyvinyl alcohol homopolymer of a polyamide having a molecular weight of from 15,000 to 30,000 selected from the group consisting of nylon 66, nylon 6, nylon 11, nylon 12, nylon 6,10 copolymer, nylon 6,12 copolymer and grafted nylon.
Claim 3
Dependent Claim
26 words
The composition of claim 1 wherein the plasticizer is a mixture of ortho and para isomers of N-ethyl toluene sulfonamide and the polyamide is nylon 66.
References Cited (Backward Citations)
GB1077351A
Cited
US3560464A
Cited
DE1903280A1
Cited
US3516960A
Cited
US3632786A
Cited
US3607812A
Cited
US3980605A
Cited
JPS5128138A
Cited
US3997489A
Cited
US4261473A
Cited
US4243074A
Cited
US4284671A
Cited
US4289830A
Cited
EP0039226A2
Cited
US4347332A
Cited
JPS57131246A
Cited
US4451599A
Cited
US4427825A
Cited
US4536532A
Cited
US4464438A
Cited
US4529666A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-09-08 | 1990-03-10 | 1990-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-08 | 1994-03-10 | 1994-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-08 | 1998-03-10 | 1998-09-09 | $7700.00 | Window Closed / Lapsed |