US4140727A
Expired / Lapsed
US
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Fluoroalkyleneether silicate copolymers
Assignee: United States Department of the Air Force
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Filing: 1978-01-10
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Granted: 1979-02-20
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Expires: 1998-01-10
Abstract
Abstract Fluoroalkyleneether silicate copolymers are synthesized by the polycondensation of a bis-dimethylcarbinol containing a fluoroalkyleneether segment and bis-(dimethylamino) methylvinylsilane. The copolymers are useful in applications, e.g., as seals and sealants, involving use temperatures ranging from about -90 DEG C. to 600 DEG C. They are particularly useful when blended with a fluorocarbon elastomer, enhancing the strength and low temperature flexibility of the elastomer.
Inventors
- 👤 Robert E. Cochoy
- 👤 Alan A. Shaffer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:33
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/42; C08G77/46; C08G77/60
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
111 words
A fluoroalkyleneether silicate copolymer consisting essentially of recurring units having the following structural formula: ##STR11## wherein R f is (CF 2 OCF 2 ) x , in which x is an integer in the range of 4 to 8, inclusive, or CF 2 (OCF 2 CF 2 ) y O(CF 2 ) 5 O(CF 2 CF 2 O) z CF 2 , in which y and z are each an integer equal to at least 1 and the sum of y and z is in the range of 5 to 7, inclusive, m is equal to zero or 2, and n is an integer equal to the number of recurring units.
Claim 2
Dependent Claim
111 words
A fluoroalkyleneether silicate copolymer consisting essentially of recurring units having the following structural formula: ##STR11## wherein R f is (CF 2 OCF 2 ) x , in which x is an integer in the range of 4 to 8, inclusive, or CF 2 (OCF 2 CF 2 ) y O(CF 2 ) 5 O(CF 2 CF 2 O) z CF 2 , in which y and z are each an integer equal to at least 1 and the sum of y and z is in the range of 5 to 7, inclusive, m is equal to zero or 2, and n is an integer equal to the number of recurring units.
Claim 3
Dependent Claim
22 words
The copolymer of claim 1 in which R f is (CF 2 OCF 2 ) x and m is equal to zero.
Claim 4
Dependent Claim
22 words
The copolymer of claim 1 in which R f is (CF 2 OCF 2 ) x and m is equal to 2.
Claim 5
Dependent Claim
36 words
The copolymer of claim 1 in which R f is CF 2 (OCF 2 CF 2 ) y O(CF 2 ) 5 O(CF 2 CF 2 O) z CF 2 and m is equal to zero.
Claim 6
Dependent Claim
36 words
The copolymer of claim 1 in which R f is CF 2 (OCF 2 CF 2 ) y O(CF 2 ) 5 O(CF 2 CF 2 O) z CF 2 and m is equal to 2.
Claim 7
Dependent Claim
154 words
An elastomeric composition comprising a blend of a fluorocarbon elastomer and a fluoroalkyleneether silicate copolymer consisting essentially of recurring units having the following structural formula: ##STR12## wherein R f is (CF 2 OCF 2 ) x , in which x is an integer in the range of 4 to 8, inclusive, or CF 2 (OCF 2 CF 2 ) y O(CF 2 ) 5 O(CF 2 CF 2 O) z CF 2 , in which y and z are each an integer equal to at least 1, and the sum of y and z is in the range of 5 to 7, inclusive, m is equal to zero or 2, and n is an integer equal to the number of recurring units, said blend containing about 70 to 95 parts by weight of fluorocarbon elastomer and about 5 to 30 parts by weight of copolymer, based on a total of 100 parts by weight.
Claim 8
Dependent Claim
154 words
An elastomeric composition comprising a blend of a fluorocarbon elastomer and a fluoroalkyleneether silicate copolymer consisting essentially of recurring units having the following structural formula: ##STR12## wherein R f is (CF 2 OCF 2 ) x , in which x is an integer in the range of 4 to 8, inclusive, or CF 2 (OCF 2 CF 2 ) y O(CF 2 ) 5 O(CF 2 CF 2 O) z CF 2 , in which y and z are each an integer equal to at least 1, and the sum of y and z is in the range of 5 to 7, inclusive, m is equal to zero or 2, and n is an integer equal to the number of recurring units, said blend containing about 70 to 95 parts by weight of fluorocarbon elastomer and about 5 to 30 parts by weight of copolymer, based on a total of 100 parts by weight.
Claim 9
Dependent Claim
160 words
An elastomeric composition comprising a blend of a fluorocarbon elastomer derived from vinylidene fluoride and hexafluoropropylene and a fluoroalkyleneether silicate copolymer consisting essentially of recurring units having the following structural formula: ##STR13## wherein R f is (CF 2 OCF 2 ) x , in which x is an integer in the range of 4 to 8, inclusive, or CF 2 (OCF 2 CF 2 ) y O(CF 2 ) 5 O(CF 2 CF 2 O) z CF 2 , in which y and z are each an integer equal to at least 1, and the sum of y and z is in the range of 5 to 7, inclusive, m is equal to zero or 2, and n is an integer equal to the number of recurring units, said blend containing about 70 to 95 parts by weight of fluorocarbon elastomer and about 5 to 30 parts by weight of copolymer, based on a total of 100 parts by weight.
Claim 10
Dependent Claim
160 words
An elastomeric composition comprising a blend of a fluorocarbon elastomer derived from vinylidene fluoride and hexafluoropropylene and a fluoroalkyleneether silicate copolymer consisting essentially of recurring units having the following structural formula: ##STR13## wherein R f is (CF 2 OCF 2 ) x , in which x is an integer in the range of 4 to 8, inclusive, or CF 2 (OCF 2 CF 2 ) y O(CF 2 ) 5 O(CF 2 CF 2 O) z CF 2 , in which y and z are each an integer equal to at least 1, and the sum of y and z is in the range of 5 to 7, inclusive, m is equal to zero or 2, and n is an integer equal to the number of recurring units, said blend containing about 70 to 95 parts by weight of fluorocarbon elastomer and about 5 to 30 parts by weight of copolymer, based on a total of 100 parts by weight.
Claim 11
Dependent Claim
22 words
The composition of claim 6 in which R f is (CF 2 OCF 2 ) x and m is equal to zero.
Claim 12
Dependent Claim
22 words
The composition of claim 6 in which R f is (CF 2 OCF 2 ) x and m is equal to 2.
Claim 13
Dependent Claim
36 words
The composition of claim 6 in which R f is CF 2 (OCF 2 CF 2 ) y O(CF 2 ) 5 O(CF 2 CF 2 O) z CF 2 and m is equal to zero.
Claim 14
Dependent Claim
36 words
The composition of claim 6 in which R f is CF 2 (OCF 2 CF 2 ) y O(CF 2 ) 5 O(CF 2 CF 2 O) z CF 2 and m is equal to 2.
Claim 15
Dependent Claim
123 words
A process for preparing a fluoroalkyleneether silicate copolymer which comprises the step of reacting in an inert atmosphere a bis-dimethyl carbinol having the following formula: ##STR14## wherein R f is (CF 2 OCF 2 ) x , in which x is an integer in the range of 4 to 8, inclusive, or CF 2 (OCF 2 CF) y O(CF 2 ) 5 O(CF 2 CF 2 O) z CF 2 , in which y and z are each an integer equal to at least 1 and the sum of y and z is in the range of 5 to 7, inclusive, with a methyl vinyl silane having the following formula: ##STR15## alone or in admixture with a dimethylsilane having the following formula: ##STR16##
Claim 16
Dependent Claim
123 words
A process for preparing a fluoroalkyleneether silicate copolymer which comprises the step of reacting in an inert atmosphere a bis-dimethyl carbinol having the following formula: ##STR14## wherein R f is (CF 2 OCF 2 ) x , in which x is an integer in the range of 4 to 8, inclusive, or CF 2 (OCF 2 CF) y O(CF 2 ) 5 O(CF 2 CF 2 O) z CF 2 , in which y and z are each an integer equal to at least 1 and the sum of y and z is in the range of 5 to 7, inclusive, with a methyl vinyl silane having the following formula: ##STR15## alone or in admixture with a dimethylsilane having the following formula: ##STR16##
Claim 17
Dependent Claim
31 words
The process of claim 12 in which the bis-dimethyl carbinol is reacted with the methyl vinyl silane alone and the mole ratio of silane to carbinol is about 4 to 1.
Claim 18
Dependent Claim
49 words
The process of claim 12 in which the bis-dimethyl carbinol is reacted with the methyl vinyl silane in admixture with the dimethylsilane, the mole ratio of silanes to carbinol is about 4 to 1, and the mole ratio of dimethylsilane to methyl vinyl silane is about 2 to 1.
References Cited (Backward Citations)
US3346515A
Cited
US3997501A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-02-19 | 1982-08-21 | 1983-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-19 | 1986-08-21 | 1987-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-19 | 1990-08-21 | 1991-02-20 | $7700.00 | Window Closed / Lapsed |