US4621014A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Biaxially oriented polyolefin films with ethylene-vinyl alcohol barrier layer
Assignee: Mobil Oil AS
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Filing: 1984-12-27
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Granted: 1986-11-04
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Expires: 2004-12-27
Abstract
Abstract Polypropylene films having a coextruded ethylene-vinyl alcohol (EVAL) layer cannot be readily oriented because the orientation temperature for the EVAL layer is somewhat higher. By adding an aryl sulfonamide, such as p-toluenesulfonamide to the EVAL layer its orientation temperature is reduced enabling orientation of the composite film.
Inventors
- 👤 Pang-Chia Lu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:34
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; B; B29; B29C; B29C55/00; B29C55/005; B29C55/02; B29C55/023; B29C55/026; C08K; C08K5/00; C08K5/36; C08K5/43; B29K; B29K2023/00; B29K2023/04; B29K2023/06; B29K2023/0608; B29K2023/0641; B29K2023/08; B29K2023/083; B29K2023/10; B29K2023/12; C08J2329/00; C08J2329/02; C08J2329/04; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/24975; Y10T428/31504; Y10T428/31725; Y10T428/3175; Y10T428/31757; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
58 words
A biaxially oriented, polyolefin containing film comprising: (A) two outer layers comprising polyolefin; and (B) a polyamide-free oxygen barrier layer sandwiched between said (A) layers comprising an ethylene vinyl alcohol polymer and an amount of aromatic sulfonamide effective to render the ethylene vinyl alcohol layer orientable at temperatures suitable for the biaxial orientation of the polyolefin layers (A).
Claim 2
Dependent Claim
58 words
A biaxially oriented, polyolefin containing film comprising: (A) two outer layers comprising polyolefin; and (B) a polyamide-free oxygen barrier layer sandwiched between said (A) layers comprising an ethylene vinyl alcohol polymer and an amount of aromatic sulfonamide effective to render the ethylene vinyl alcohol layer orientable at temperatures suitable for the biaxial orientation of the polyolefin layers (A).
Claim 3
Dependent Claim
11 words
The film of claim 1 in which said polyolefin is polypropylene.
Claim 4
Dependent Claim
12 words
The film of claim 1 in which said aromatic sulfonamide is p-toluenesulfonamide.
Claim 5
Dependent Claim
12 words
The film of claim 1 in which said aromatic sulfonamide is N-ethyl-o,p-toluenesulfonamide.
Claim 6
Dependent Claim
34 words
The films of claim 1 in which ethylene vinyl alcohol copolymer has no more than about 70 mole % of ethylene, and melting and softening temperatures higher than said polyolefin of said outer layers.
Claim 7
Dependent Claim
22 words
The film of claim 5 in said ethylene vinyl alcohol copolymer has from about 28 to about 36 mole % of ethylene.
Claim 8
Dependent Claim
25 words
The film of claim 1 which contains in addition two adhesion promoting layers interposed between said outer polyolefin layers and said inner oxygen barrier layer.
Claim 9
Dependent Claim
32 words
The film of claim 7 in which said adhesion promoting layer is a polyolefin polymer or copolymer blended with a graft copolymer of polyethylene and an unsaturated fused ring carboxylic acid anhydride.
Claim 10
Dependent Claim
44 words
The film of claim 1 in which said polyolefin of said outer layers (A) has a melting point of from about 150° to about 170° C. and said ethylene vinyl alcohol copolymer has a melting point of from about 170° to about 190° C.
Claim 11
Dependent Claim
157 words
A biaxially oriented, polypropylene containing film structure consisting essentially of: (A) two outer layers composed of polypropylene; (B) one inner polyamide-free oxygen barrier layer comprising a blend of: an ethylene vinyl alcohol copolymer which has from about 28 to about 36 mole % of ethylene, the remainder being essentially vinyl alcohol; and a toluenesulfonamide; and (C) two adhesion promoting layers interposed between said outer polypropylene layers and said inner oxygen barrier layer, said adhesion promoting layers being composed of a polyolefin polymer or copolymer, blended with a graft copolymer of polyethylene and an unsaturated fused ring carboxylic acid anhydride, said oxygen barrier layer comprising from about 5% to about 20% by weight of said film structure, said adhesion promoting layers each comprising from about 2% to about 10% by weight of said film structure, and said toluene sulfonamide comprising from about 5% to about 25% by weight of said blend of ethylene vinyl alcohol and toluene sulfonamide.
Claim 12
Dependent Claim
157 words
A biaxially oriented, polypropylene containing film structure consisting essentially of: (A) two outer layers composed of polypropylene; (B) one inner polyamide-free oxygen barrier layer comprising a blend of: an ethylene vinyl alcohol copolymer which has from about 28 to about 36 mole % of ethylene, the remainder being essentially vinyl alcohol; and a toluenesulfonamide; and (C) two adhesion promoting layers interposed between said outer polypropylene layers and said inner oxygen barrier layer, said adhesion promoting layers being composed of a polyolefin polymer or copolymer, blended with a graft copolymer of polyethylene and an unsaturated fused ring carboxylic acid anhydride, said oxygen barrier layer comprising from about 5% to about 20% by weight of said film structure, said adhesion promoting layers each comprising from about 2% to about 10% by weight of said film structure, and said toluene sulfonamide comprising from about 5% to about 25% by weight of said blend of ethylene vinyl alcohol and toluene sulfonamide.
Claim 13
Dependent Claim
47 words
The film of claim 10 in which said outer polypropylene layers each comprise about 40% by weight of said film said adhesion promoting layers each comprise about 5% by weight of said film structure and said oxygen barrier layer constitutes about 10% by weight of said film.
Claim 14
Dependent Claim
16 words
The film structure of claim 11 having a thickness from about 0.5 to about 5 mils.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1989-11-03 | 1990-05-05 | 1990-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-03 | 1994-05-05 | 1994-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-03 | 1998-05-05 | 1998-11-04 | $7700.00 | Window Closed / Lapsed |