US4544721A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chlorotriflouroethylene polymer oriented films
Assignee: EIDP Inc
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Filing: 1983-10-06
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Granted: 1985-10-01
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Expires: 2003-10-06
Abstract
Abstract A film of semi-crystalline poly(chlorotrifluoroethylene) or a semi-crystalline copolymer of chlorotrifluoroethylene which contain up to 5% comonomer units which film exhibits upon heat shrinking, no expansion in the direction perpendicular to stretching.
Inventors
- 👤 Stanley B. Levy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:16
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; B; B29; B29C; B29C55/00; B29C55/005; B29C55/02; B29C55/04; B29C55/06; B29K; B29K2027/00; B29K2027/12; C08J2327/00; C08J2327/02; C08J2327/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
145 words
A film of semi-crystalline poly(chlorotrifluoroethylene) or a semi-crystalline copolymer of chlorotrifluoroethylene which contains up to 5% by weight of units of an ethylenically unsaturated copolymerizable organic monomer selected from the class consisting of alpha-olefins, fluorinated alpha-olefins and fluorinated ethers, which film has been oriented by stretching a substantially amorphous form of the film at least 2.5 times, at a temperature at least 40° C. above the second order transition temperature at a ratio of film width to length of stretch zone of greater than 3, so that the film, after cooling under tension for two minutes at about 150° C. exhibits a shrinkage of 0 to 2 percent in a first direction in the plane of the film, and a shrinkage of at least 12 percent in a second direction in the same plane as the first and which is perpendicular to the first direction.
Claim 2
Dependent Claim
145 words
A film of semi-crystalline poly(chlorotrifluoroethylene) or a semi-crystalline copolymer of chlorotrifluoroethylene which contains up to 5% by weight of units of an ethylenically unsaturated copolymerizable organic monomer selected from the class consisting of alpha-olefins, fluorinated alpha-olefins and fluorinated ethers, which film has been oriented by stretching a substantially amorphous form of the film at least 2.5 times, at a temperature at least 40° C. above the second order transition temperature at a ratio of film width to length of stretch zone of greater than 3, so that the film, after cooling under tension for two minutes at about 150° C. exhibits a shrinkage of 0 to 2 percent in a first direction in the plane of the film, and a shrinkage of at least 12 percent in a second direction in the same plane as the first and which is perpendicular to the first direction.
Claim 3
Dependent Claim
69 words
The film of claim 1 wherein said first direction is the direction perpendicular to the direction of stretching and said second direction is the direction of stretching semi-crystalline poly(chlorotrifluoroethylene) or a semi-crystalline copolymer of chlorotrifluoroethylene which contains up to 5% by weight of units of an ethylenically unsaturated copolymerizable organic monomer, which film exhibits transverse shrinkage of 0 to 2 percent, and longitudinal shrinkage of at least 12 percent.
Claim 4
Dependent Claim
17 words
The film of claim 1 or 2 wherein the ethylenically unsaturated copolymerizable organic monomer is vinylidene fluoride.
Claim 5
Dependent Claim
108 words
A dimensionally stable film comprising a film obtained by heating a film of claim 1 while under tension; said dimensionally stable film exhibiting a dimensional change in a first direction in the plane of the film of between 0 and 4%, and a dimensional change of between 0 2% in a second direction in the same plane and which is perpendicular to the first direction, when heated at 150° C. for 30 minutes and the tensile modulus in said first direction is at least 1.5 times that of an as-cast film and the modulus in the second direction is at least 75% of that of the first direction.
Claim 6
Dependent Claim
29 words
A dimensionally stable film of claim 4 wherein the first direction is the direction of stretching and the second direction is a direction perpendicular to the direction of stretching.
References Cited (Backward Citations)
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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) | 1988-09-30 | 1989-04-01 | 1989-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-30 | 1993-04-01 | 1993-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-30 | 1997-04-01 | 1997-10-01 | $7700.00 | Window Closed / Lapsed |