US4595472A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silicon carbide preceramic vinyl-containing polymers
Assignee: Dow Silicones Corp
•
Filing: 1985-07-08
•
Granted: 1986-06-17
•
Expires: 2005-07-08
Abstract
Abstract Vinyl-containing polysilanes of the average formula [R.sub.2 Si][RSi][R.sub.d '(CH.sub.2 ═CH)Si] where R is an alkyl radical containing 1 to 4 carbon atoms, R' is an alkyl radical containing 1 to 4 carbon atoms, a vinyl radical, or a phenyl radical, d is 1 or 2 and where the polysilane contains 0 to 60 mole percent [R 2 Si] units, 30 to 99.5 mole percent [RSi] units, and 0.5 to 15 mole percent [R d '(CH 2 ═CH)Si] units are disclosed. The vinyl-containing polysilanes may be converted to silicon carbide-containing ceramics by pyrolysis in an inert atmosphere or in a vacuum at temperatures greater than 800° C. Shaped articles prepared from the vinyl-containing polysilanes may be rendered infusible prior to pyrolysis by exposure to air or ultraviolet light.
Inventors
- 👤 Loren A. Haluska
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:46
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/56; C04B35/565; C04B35/571; C01; C01B; C01B32/00; C01B32/90; C01B32/914; C01B32/956; C01B32/963; C01B32/977; C04B35/622; C04B35/62227; C04B35/626; C04B35/63; C04B35/632; C04B35/634; C08; C08G; C08G77/00; C08G77/60; C01P; C01P2002/00; C01P2002/80; C01P2002/88; C01P2006/00; C01P2006/80
Claims Analysis
Total Claims: 41
Claim 1
Independent Claim
161 words
A method of preparing a silicon carbide-containing ceramic article, said method comprising (A) forming an article of the desired shape from a polysilane of the average formula [R.sub.2 Si][RSi][R.sub.d '(CH.sub.2 ═CH)Si] in which polysilane there is from 0 to 60 mole percent [R 2 Si] units, 30 to 99.5 mole percent [RSi] units and 0.5 to 15 mole percent [R d '(CH 2 ═CH)Si] units, where the remaining bonds on silicon are attached to other silicon atoms and alkyl radicals of 1 to 4 carbon atoms, vinyl radicals or phenyl radicals wherein R is an alkyl radical containing 1 to 4 carbon atoms, R' is an alkyl radical containing 1 to 4 carbon atoms, a vinyl radical, or a phenyl radical, and d is 1 or 2; and (B) heating the article formed in (A) in an inert atmosphere or in a vacuum to an elevated temperature greater than 800° C. until the polysilane is converted to silicon carbide-containing ceramic articles.
Claim 2
Independent Claim
161 words
A method of preparing a silicon carbide-containing ceramic article, said method comprising (A) forming an article of the desired shape from a polysilane of the average formula [R.sub.2 Si][RSi][R.sub.d '(CH.sub.2 ═CH)Si] in which polysilane there is from 0 to 60 mole percent [R 2 Si] units, 30 to 99.5 mole percent [RSi] units and 0.5 to 15 mole percent [R d '(CH 2 ═CH)Si] units, where the remaining bonds on silicon are attached to other silicon atoms and alkyl radicals of 1 to 4 carbon atoms, vinyl radicals or phenyl radicals wherein R is an alkyl radical containing 1 to 4 carbon atoms, R' is an alkyl radical containing 1 to 4 carbon atoms, a vinyl radical, or a phenyl radical, and d is 1 or 2; and (B) heating the article formed in (A) in an inert atmosphere or in a vacuum to an elevated temperature greater than 800° C. until the polysilane is converted to silicon carbide-containing ceramic articles.
Claim 3
Dependent Claim
24 words
A method as defined in claim 1 wherein in step (B) the article is heated to an elevated temperature of at least 1000° C.
Claim 4
Dependent Claim
39 words
A method as defined in claim 1 wherein said polysilane contains 3 to 20 mole percent [R 2 Si] units, 70 to 95 mole percent [RSi] units, and 2 to 10 mole percent [R d '(CH 2 ═CH)Si] units.
Claim 5
Dependent Claim
39 words
A method as defined in claim 2 wherein said polysilane contains 3 to 20 mole percent [R 2 Si] units, 70 to 95 mole percent [RSi] units, and 2 to 10 mole percent [R d '(CH 2 ═CH)Si] units.
Claim 6
Dependent Claim
39 words
A method as defined in claim 3 wherein R and R' are methyl radicals, d is equal to 1, and the remaining bonds on silicon in said polysilane are attached to other silicon atoms and methyl or vinyl radicals.
Claim 7
Dependent Claim
39 words
A method as defined in claim 4 wherein R and R' are methyl radicals, d is equal to 1, and the remaining bonds on silicon on said polysilane are attached to other silicon atoms and methyl or vinyl radicals.
Claim 8
Dependent Claim
21 words
A method as defined in claim 1 wherein said article formed in step (A) is rendered infusible prior to step (B).
Claim 9
Dependent Claim
21 words
A method as defined in claim 2 wherein said article formed in step (A) is rendered infusible prior to step (B).
Claim 10
Dependent Claim
21 words
A method as defined in claim 3 wherein said article formed in step (A) is rendered infusible prior to step (B).
Claim 11
Dependent Claim
21 words
A method as defined in claim 4 wherein said article formed in step (A) is rendered infusible prior to step (B).
Claim 12
Dependent Claim
21 words
A method as defined in claim 5 wherein said article formed in step (A) is rendered infusible prior to step (B).
Claim 13
Dependent Claim
21 words
A method as defined in claim 6 wherein said article formed in step (A) is rendered infusible prior to step (B).
Claim 14
Dependent Claim
22 words
A method as defined in claim 7 wherein said article formed in step (A) is rendered infusible by exposure to ultraviolet light.
Claim 15
Dependent Claim
22 words
A method as defined in claim 8 wherein said article formed in step (A) is rendered infusible by exposure of ultraviolet light.
Claim 16
Dependent Claim
22 words
A method as defined in claim 9 wherein said article formed in step (A) is rendered infusible by exposure to ultraviolet light.
Claim 17
Dependent Claim
22 words
A method as defined in claim 10 wherein said article formed in step (A) is rendered infusible by exposure to ultraviolet light.
Claim 18
Dependent Claim
22 words
A method as defined in claim 11 wherein said article formed in step (A) is rendered infusible by exposure to ultraviolet light.
Claim 19
Dependent Claim
22 words
A method as defined in claim 12 wherein said article formed in step (A) is rendered infusible by exposure to ultraviolet light.
Claim 20
Independent Claim
168 words
A method of preparing a silicon carbide-containing ceramic article, said method comprising (A) forming an article of the desired shape from a polysilane of the average formula [R.sub.2 Si][RSi][R.sub.d '(CH.sub.2 ═CH)Si] in which polysilane there is from 0 to 60 mole percent [R 2 Si] units, 30 to 99.5 mole percent [RSi] units and 0.5 and 15 mole percent [R d '(CH 2 ═CH)Si] units wherein the remaining bonds on silicon are attached to other silicon atoms and radicals having formula R"'O--, wherein R is an alkyl radical containing 1 to 4 carbon atoms, R' is an alkyl radical containing 1 to 4 carbon atoms, a vinyl radical or a phenyl radical, d is 0, 1, or 2, and R"' is an alkyl radical containing 1 to 4 carbon atoms or a phenyl radical; and (B) heating the article formed in (A) in an inert atmosphere or in a vacuum to an elevated temperature greater than 800° C. until the polysilane is converted to silicon carbide-containing ceramic article.
Claim 21
Independent Claim
168 words
A method of preparing a silicon carbide-containing ceramic article, said method comprising (A) forming an article of the desired shape from a polysilane of the average formula [R.sub.2 Si][RSi][R.sub.d '(CH.sub.2 ═CH)Si] in which polysilane there is from 0 to 60 mole percent [R 2 Si] units, 30 to 99.5 mole percent [RSi] units and 0.5 and 15 mole percent [R d '(CH 2 ═CH)Si] units wherein the remaining bonds on silicon are attached to other silicon atoms and radicals having formula R"'O--, wherein R is an alkyl radical containing 1 to 4 carbon atoms, R' is an alkyl radical containing 1 to 4 carbon atoms, a vinyl radical or a phenyl radical, d is 0, 1, or 2, and R"' is an alkyl radical containing 1 to 4 carbon atoms or a phenyl radical; and (B) heating the article formed in (A) in an inert atmosphere or in a vacuum to an elevated temperature greater than 800° C. until the polysilane is converted to silicon carbide-containing ceramic article.
Claim 22
Dependent Claim
24 words
A method as defined in claim 19 wherein in step (B) the article is heated to an elevated temperature of at least 1000° C.
Claim 23
Dependent Claim
39 words
A method as defined in claim 20 wherein said polysilane contains 3 to 20 mole percent [R 2 Si] units, 70 to 95 mole percent [RSi] units, and 2 to 10 mole percent [R d '(CH 2 ═CH)Si] units.
Claim 24
Dependent Claim
21 words
A method as defined in claim 21 wherein R, R', and R"' are methyl radicals and d is equal to 1.
Claim 25
Dependent Claim
21 words
A method as defined in claim 19 wherein said article formed in step (A) is rendered infusible prior to step (B).
Claim 26
Dependent Claim
21 words
A method as defined in claim 20 wherein said article formed in step (A) is rendered infusible prior to step (B).
Claim 27
Dependent Claim
21 words
A method as defined in claim 21 wherein said article formed in step (A) is rendered infusible prior to step (B).
Claim 28
Dependent Claim
22 words
A method as defined in claim 23 wherein said article formed in step (A) is rendered infusible by exposure to ultraviolet light.
Claim 29
Dependent Claim
22 words
A method as defined in claim 24 wherein said article formed in step (A) is rendered infusible by exposure to ultraviolet light.
Claim 30
Dependent Claim
22 words
A method as defined in claim 25 wherein said article formed in step (A) is rendered infusible by exposure to ultraviolet light.
Claim 31
Independent Claim
173 words
A method of preparing a silicon carbide-containing ceramic article, said method comprising (A) forming an article of the desired shape from a polysilane of the average formula [R.sub.2 Si][RSi][R.sub.d '(CH.sub.2 ═CH)Si] in which polysilane there is from 0 to 60 mole percent [R 2 Si] units, 30 to 99.5 mole percent [RSi] units, and 0.5 to 15 mole percent [R d '(CH 2 ═CH)Si] units wherein the remaining bonds on silicon are attached to other silicon atoms and --NHR v radicals wherein R is an alkyl radical containing 1 to 4 carbon atoms, R' is an alkyl radical containing 1 to 4 carbon atoms, a vinyl radical or a phenyl radical, d is 0, 1 or 2, and R v is hydrogen, an alkyl radical containing 1 to 4 carbon atoms, a phenyl radical or a --SiR 3 radical; and (B) heating the article formed in (A) in an inert atmosphere or in a vacuum to an elevated temperature greater than 800° C. until the polysilane is converted to silicon carbide-containing ceramic article.
Claim 32
Independent Claim
173 words
A method of preparing a silicon carbide-containing ceramic article, said method comprising (A) forming an article of the desired shape from a polysilane of the average formula [R.sub.2 Si][RSi][R.sub.d '(CH.sub.2 ═CH)Si] in which polysilane there is from 0 to 60 mole percent [R 2 Si] units, 30 to 99.5 mole percent [RSi] units, and 0.5 to 15 mole percent [R d '(CH 2 ═CH)Si] units wherein the remaining bonds on silicon are attached to other silicon atoms and --NHR v radicals wherein R is an alkyl radical containing 1 to 4 carbon atoms, R' is an alkyl radical containing 1 to 4 carbon atoms, a vinyl radical or a phenyl radical, d is 0, 1 or 2, and R v is hydrogen, an alkyl radical containing 1 to 4 carbon atoms, a phenyl radical or a --SiR 3 radical; and (B) heating the article formed in (A) in an inert atmosphere or in a vacuum to an elevated temperature greater than 800° C. until the polysilane is converted to silicon carbide-containing ceramic article.
Claim 33
Dependent Claim
24 words
A method as defined in claim 29 wherein in step (B) the article is heated to an elevated temperature of at least 1000° C.
Claim 34
Dependent Claim
39 words
A method as defined in claim 30 wherein said polysilane contains 3 to 20 mole percent [R 2 Si] units, 70 to 95 mole percent [RSi] units, and 2 to 10 mole percent [R d '(CH 2 ═CH)Si] units.
Claim 35
Dependent Claim
29 words
A polysilane as defined in claim 31 wherein R and R' are methyl radicals, R v is --C 4 H 9 or phenyl, and d is equal to 1.
Claim 36
Dependent Claim
21 words
A method as defined in claim 29 wherein said article formed in step (A) is rendered infusible prior to step (B).
Claim 37
Dependent Claim
21 words
A method as defined in claim 30 wherein said article formed in step (A) is rendered infusible prior to step (B).
Claim 38
Dependent Claim
21 words
A method as defined in claim 31 wherein said article formed in step (A) is rendered infusible prior to step (B).
Claim 39
Dependent Claim
22 words
A method as defined in claim 33 wherein said article formed in step (A) is rendered infusible by exposure to ultraviolet light.
Claim 40
Dependent Claim
22 words
A method as defined in claim 34 wherein said article formed in step (A) is rendered infusible by exposure to ultraviolet light.
Claim 41
Dependent Claim
22 words
A method as defined in claim 35 wherein said article formed in step (A) is rendered infusible by exposure to ultraviolet light.
References Cited (Backward Citations)
US31447A
Cited
US4310651A
Cited
US4260780A
Cited
US4298559A
Cited
US4314956A
Cited
USRE31447E
Cited
US4546163A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-06-16 | 1989-12-16 | 1990-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-16 | 1993-12-16 | 1994-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-16 | 1997-12-16 | 1998-06-17 | $7700.00 | Window Closed / Lapsed |