US4464438A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blends of polyvinyl alcohol and ethylene-vinyl alcohol copolymer as grease resistant melt extrudable films
Assignee: Mobil Oil AS
•
Filing: 1983-05-02
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Granted: 1984-08-07
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Expires: 2003-05-02
Abstract
Abstract Blends of polyvinyl alcohol, and ethylene-vinyl alcohol copolymer containing a processing aid such as polyamide, polyurethane or polyoxazoline are melt extrudable into paper-like films having excellent oxygen barrier and grease resistance properties.
Inventors
- 👤 Pang-Chia Lu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:08
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/30; B32B27/06; B32B27/08; B32B27/18; B32B27/20; B32B27/306; B32B27/32; C; C08; C08J; C08J5/00; C08J5/18; C08L; C08L29/00; C08L29/02; C08L29/04; B32B2270/00; B32B2307/00; B32B2307/40; B32B2307/41; B32B2307/50; B32B2307/514; B32B2307/518; B32B2307/70; B32B2307/724; B32B2307/7242; B32B2307/7244; C08J2329/00; C08J2329/02; C08J2329/04; C08L2205/00; C08L2205/02; C08L2205/03; C08L75/00; C08L75/04; C08L77/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
64 words
A composition suitable for melt extrusion into opaque films comprising an intimate blend of: (A) 20-60 weight percent of polyvinyl alcohol; (B) 30-70 weight percent of an ethylene-vinyl alcohol copolymer containing 28 to 70 mole percent of ethylene; and (C) 5-20 weight percent of an agent to aid melt processing of the mixture selected from the group consisting of polyamides, polyurethanes and polyoxazoline polymers.
Claim 2
Dependent Claim
64 words
A composition suitable for melt extrusion into opaque films comprising an intimate blend of: (A) 20-60 weight percent of polyvinyl alcohol; (B) 30-70 weight percent of an ethylene-vinyl alcohol copolymer containing 28 to 70 mole percent of ethylene; and (C) 5-20 weight percent of an agent to aid melt processing of the mixture selected from the group consisting of polyamides, polyurethanes and polyoxazoline polymers.
Claim 3
Dependent Claim
16 words
The composition of claim 1 in which said agent to aid melt processing is a polyamide.
Claim 4
Dependent Claim
16 words
The composition of claim 1 in which said agent to aid melt processing is a polyurethane.
Claim 5
Dependent Claim
17 words
The composition of claim 1 in which said agent to aid melt processing is a polyoxazoline polymer.
Claim 6
Dependent Claim
56 words
An opaque, melt extruded film comprising: (A) 20-60 weight percent of polyvinyl alcohol; (B) 30-70 weight percent of an ethylene-vinyl alcohol copolymer containing 28 to 70 mole percent of ethylene; and (C) 5-20 weight percent of an agent to aid melt processing of the mixture, selected from the group consisting of polyamides, polyurethanes, and polyoxazoline polymers.
Claim 7
Dependent Claim
56 words
An opaque, melt extruded film comprising: (A) 20-60 weight percent of polyvinyl alcohol; (B) 30-70 weight percent of an ethylene-vinyl alcohol copolymer containing 28 to 70 mole percent of ethylene; and (C) 5-20 weight percent of an agent to aid melt processing of the mixture, selected from the group consisting of polyamides, polyurethanes, and polyoxazoline polymers.
Claim 8
Dependent Claim
16 words
The film of claim 5 in which said agent to aid melt processing is a polyamide.
Claim 9
Dependent Claim
16 words
The film of claim 5 in which said agent to aid melt processing is a polyurethane.
Claim 10
Dependent Claim
17 words
The film of claim 5 in which said agent to aid melt processing is a polyoxazoline polymer.
Claim 11
Dependent Claim
9 words
The film of claim 5 which is biaxially oriented.
Claim 12
Dependent Claim
21 words
A multi-layer composite film comprising a film layer in accordance with claim 5 and at least one other polymeric film layer.
Claim 13
Dependent Claim
15 words
The composite film of claim 10 in which said other polymeric film layer is polyolefin.
Claim 14
Dependent Claim
15 words
The composite film of claim 11 in which said other polymeric film layer is polypropylene.
References Cited (Backward Citations)
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Cited
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Cited
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Cited
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Cited
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-08-07 | 1988-02-06 | 1988-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-07 | 1992-02-06 | 1992-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-07 | 1996-02-06 | 1996-08-07 | $7700.00 | Window Closed / Lapsed |