US4269757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Siloxane compositions which form ceramics at high temperatures
Assignee: DuPont Toray Specialty Materials KK
•
Filing: 1980-01-18
•
Granted: 1981-05-26
•
Expires: 2000-01-18
Abstract
Abstract What is disclosed is a composition of matter which is a siloxane copolymer, a siloxane polymer, a ceramic forming filler and a peroxide which upon heating to 500 DEG C. or greater forms a pliable, flexible ceramic material which is useful as insulative coatings on various electrical conductive substances such as electric wires and cables.
Inventors
- 👤 Katsutoshi Mine
- 👤 Tsuneo Maruyama
- 👤 Kazuhide Takeshita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:28
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/46; C; C08; C08K; C08K3/00; C08K3/01; C08K3/013; C08K5/00; C08K5/04; C08K5/14; C08L; C08L83/00; C08L83/04; C08G; C08G77/00; C08G77/04; C08G77/20; C08G77/42; C08G77/44; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
102 words
A composition of matter consisting essentially of (A) 100 parts by weight of a siloxane copolymer consisting essentially of R 3 SiO 1/2 units and SiO 4/2 units wherein R is a substituted or unsubstituted monovalent hydrocarbon radical containing 1-10 carbon atoms; (B) 0-600 parts by weight of an organopolysiloxane polymer having the average unit formula R.sub.a SiO.sub.(4-a) /2 and containing no SiO 4/2 units wherein R has the same meaning as in (A) above and a has an average value of 1-3; (C) 3-500 parts by weight of a ceramic-forming filler and, (D) 0.1-10 parts by weight of an organic peroxide.
Claim 2
Dependent Claim
102 words
A composition of matter consisting essentially of (A) 100 parts by weight of a siloxane copolymer consisting essentially of R 3 SiO 1/2 units and SiO 4/2 units wherein R is a substituted or unsubstituted monovalent hydrocarbon radical containing 1-10 carbon atoms; (B) 0-600 parts by weight of an organopolysiloxane polymer having the average unit formula R.sub.a SiO.sub.(4-a) /2 and containing no SiO 4/2 units wherein R has the same meaning as in (A) above and a has an average value of 1-3; (C) 3-500 parts by weight of a ceramic-forming filler and, (D) 0.1-10 parts by weight of an organic peroxide.
Claim 3
Dependent Claim
40 words
The composition of claim 1 wherein for every 100 parts by weight of component (A) there is present 0-30 parts by weight of component (B), 20-50 parts by weight of component (C) and 2-10 parts by weight of component (D).
Claim 4
Dependent Claim
91 words
The composition as claimed in claim 1 wherein component (A) is a copolymer consisting essentially of 43 mol % of SiO 4/2 units, 30 mol % (CH 3 ) 3 SiO 1/2 units, 15 mol % of (CH 3 ) 2 (CH 2 ═CH)SiO 1/2 units and 12 mol % of CH 2 ═CH(CH 3 O) 2 SiO 1/2 units; component (B) is a vinyldimethyl endblocked polydimethylsiloxane; component (C) is selected from a group consisting essentially of zinc oxide powder, alumina powder and mica powder and component (D) is 2,4-dichlorobenzoyl peroxide.
Claim 5
Dependent Claim
16 words
The composition as claimed in claim 3 wherein component (B), the vinyldimethyl endblocked polydimethylsiloxane is ##STR2##
Claim 6
Dependent Claim
10 words
A solid substrate coated with the composition of claim 1.
Claim 7
Dependent Claim
19 words
A solid substrate coated with the composition as claimed in claim 1 and heated in excess of 500° C.
Claim 8
Dependent Claim
17 words
A solid substrate as claimed in claim 5 which is in the form of wire or cable.
Claim 9
Dependent Claim
17 words
A solid substrate as claimed in claim 6 which is in the form of wire or cable.
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) | 1984-05-25 | 1984-11-24 | 1985-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-25 | 1988-11-24 | 1989-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-25 | 1992-11-24 | 1993-05-26 | $7700.00 | Window Closed / Lapsed |