US5276121A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amorphous copolymers of two fluorinated ring monomers
Assignee: EIDP Inc
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Filing: 1992-05-05
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Granted: 1994-01-04
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Expires: 2012-05-05
Abstract
Abstract Copolymers of perfluoro(1,3-dimethyl-2,2-dioxole) with perfluoro(butenyl vinyl ether) and, optionally, with a third comonmer are amorphous in all monomer proportions, and soluble in perfluoro(2-butyl tetrahydrofuran). These copolymers are suitable in many high technology applications, especially where solubility is important, e.g., in applying coatings to substrates or articles for protection against mechanical, chemical, or environmental hazards. Dipolymers of the present invention have lower glass transition temperatures than dipolymers of perfluoro(1,3-dimethyl-2,2-dioxole) with tetrafluoroethylene having the same monomer proportions.
Inventors
- 👤 Paul R. Resnick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:36
CPC Classifications
C; C08; C08F; C08F220/00; C08F220/02; C08F220/10; C08F220/22; C08F234/00; C08F234/02; G; G02; G02B; G02B1/00; G02B1/04; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24851; Y10T428/24868; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2964; Y10T428/31504; Y10T428/3154; Y10T428/31544; Y10T428/31678
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
99 words
Amorphous copolymer of 1-99.5 mol % of perfluoro(2,2-dimethyl-1,3-dioxole) with a complementary amount of 99-0.5 mol % of at least one other comonomer, said copolymer being selected from the group consisting of dipolymers with perfluoro(butenyl vinyl ether) and terpolymers with perfluoro(butenyl vinyl ether) and with a third comonomer, wherein the third comonomer can be (a) a perhaloolefin in which halogen is fluorine or chlorine, but at least one half of the halogen atoms must be fluorine, or (b) a perfluoro(alkyl vinyl ether); the amount of the third comonomer, when present, being at most 40 mole % of the total composition.
Claim 2
Dependent Claim
99 words
Amorphous copolymer of 1-99.5 mol % of perfluoro(2,2-dimethyl-1,3-dioxole) with a complementary amount of 99-0.5 mol % of at least one other comonomer, said copolymer being selected from the group consisting of dipolymers with perfluoro(butenyl vinyl ether) and terpolymers with perfluoro(butenyl vinyl ether) and with a third comonomer, wherein the third comonomer can be (a) a perhaloolefin in which halogen is fluorine or chlorine, but at least one half of the halogen atoms must be fluorine, or (b) a perfluoro(alkyl vinyl ether); the amount of the third comonomer, when present, being at most 40 mole % of the total composition.
Claim 3
Dependent Claim
21 words
A copolymer of claim 1 wherein the copolymer is a dipolymer of perfluoro(2,2-dimethyl-1,3-dioxole) with a complementary amount of perfluoro(butenyl vinyl ether).
Claim 4
Dependent Claim
15 words
A dipolymer of claim 2 wherein the perfluoro(2,2-dimethyl-1,3-dioxole) content is at least 80 mol %.
Claim 5
Dependent Claim
16 words
A copolymer of claim 1 which is a terpolymer, the third comonomer being tetrafluoroethylene or chlorotrifluoroethylene.
Claim 6
Dependent Claim
9 words
A free-standing film of a copolymer of claim 1.
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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) | 1997-01-03 | 1997-07-05 | 1998-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-01-03 | 2001-07-05 | 2002-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-01-03 | 2005-07-05 | 2006-01-04 | $7700.00 | Window Closed / Lapsed |