US4754009A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amorphous copolymers of perfluoro-2,2-dimethyl-1,3-dioxole
Assignee: EIDP Inc
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Filing: 1986-09-04
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Granted: 1988-06-28
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Expires: 2006-09-04
Abstract
Abstract Amorphous copolymer of perfluoro-2,2-dimethyl-1,3-dioxide with at least one fluoro comonomer selected from one or more of ten defined classes having a recited minimum mole proportion of perfluoro-2,2-dimethyl-1,3-dioxole, in no event less than 65%, have high glass transition temperatures of 140 DEG C. or higher, low indices of refraction, and good physical properties, and low dielectric constants, which make them suitable for cladding optical fibers as well as for many electronics applications, including the manufacture of subtrates for circuit boards. They all are soluble at room temperature in perfluoro (2-butyltetrahydrofuran), which makes it practical to apply them as coatings from solution.
Inventors
- 👤 Edward N. Squire
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:45
CPC Classifications
C; C08; C08F; C08F234/00; C08F234/02; H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/032; H05K1/034; H05K3/00; H05K3/22; H05K3/28; H05K3/285
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
27 words
An amorphous dipolymer of 65-99 mole % of perfluoro-2,2-dimethyl-1,3-dioxole with a complementary amount of tetrafluoroethylene, the glass transition temperature of the copolymer being at least 140° C.
Claim 2
Dependent Claim
27 words
An amorphous dipolymer of 65-99 mole % of perfluoro-2,2-dimethyl-1,3-dioxole with a complementary amount of tetrafluoroethylene, the glass transition temperature of the copolymer being at least 140° C.
Claim 3
Dependent Claim
16 words
A dipolymer of claim 1 which has a glass transition temperature of at least 180° C.
Claim 4
Dependent Claim
16 words
A dipolymer of claim 2 which has a glass transition temperature of at least 220° C.
Claim 5
Dependent Claim
25 words
A dipolymer of claim 3 wherein the mole proportion of perfluoro-2,2-dimethyl-1,3-dioxole is about 89%, which dipolymer has a glass transition temperature of about 250° C.
Claim 6
Dependent Claim
25 words
A dipolymer of claim 1 wherein the mole proportion of tetrafluoroethylene is about 30%, which dipolymer has a glass transition temperatures of about 153° C.
Claim 7
Dependent Claim
25 words
A dipolymer of claim 1, wherein the mole proportion of tetrafluoroethylene is about 23%, which dipolymer has a glass transition temperature of about 176° C.
Claim 8
Dependent Claim
14 words
A dipolymer of claim 1, wherein the mole proportion of perfluoro-2,2-dimethyl-1,3-dioxole is about 98%.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-06-28 | 1991-12-28 | 1992-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-28 | 1995-12-28 | 1996-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-28 | 1999-12-28 | 2000-06-28 | $7700.00 | Window Closed / Lapsed |