US4220600A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polycarbosilane, process for its production, and its use as material for producing silicon carbide fibers
Assignee: Research Institute for Special Inorganic Materials
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Filing: 1978-10-23
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Granted: 1980-09-02
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Expires: 1998-10-23
Abstract
Abstract A process for producing polycarbosilane partly containing siloxane bonds, ich comprises adding 0.01 to 15% by weight of polyborosiloxane having phenyl groups in at least a part of the side chains of Si with its skeletal structure being composed of B, Si and O to a polysilane having the structure ##STR1## wherein n is at least 3, and R 1 and R 2 , independently from each other, represent methyl, ethyl, phenyl or hydrogen; and heating the polymer mixture in an atmosphere inert to the reaction thereby to polymerize it. The polycarbosilane has excellent properties, and is especially suitable as a raw material for the production of silicon carbide fibers.
Inventors
- 👤 Seishi Yajima
- 👤 Kiyohito Okamura
- 👤 Yoshio Hasegawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:13
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/32; C01; C01B; C01B32/00; C01B32/90; C01B32/914; C01B32/956; C01B32/963; C01B32/977; C04; C04B; C04B35/00; C04B35/515; C04B35/56; C04B35/565; C04B35/571; C08L; C08L83/00; C08L83/14; C01P; C01P2002/00; C01P2002/70; C01P2002/72; C01P2002/80; C01P2002/82; C01P2002/85; C01P2002/88; C01P2004/00; C01P2004/10; C01P2004/60; C01P2004/61; C01P2006/00; C01P2006/22; C01P2006/90
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
90 words
A process for producing polycarbosilane partly containing siloxane bonds, which comprises adding 0.01 to 15% by weight of polyborosiloxane having phenyl groups in at least a part of the side chains of Si with its skeletal structure being composed of B, Si and O to a polysilane having the structure ##STR27## wherein n is at least 3, and R 1 and R 2 , independently from each other, represent methyl, ethyl, phenyl or hydrogen; and heating the polymer mixture in an atmosphere inert to the reaction thereby to polymerize it.
Claim 2
Dependent Claim
90 words
A process for producing polycarbosilane partly containing siloxane bonds, which comprises adding 0.01 to 15% by weight of polyborosiloxane having phenyl groups in at least a part of the side chains of Si with its skeletal structure being composed of B, Si and O to a polysilane having the structure ##STR27## wherein n is at least 3, and R 1 and R 2 , independently from each other, represent methyl, ethyl, phenyl or hydrogen; and heating the polymer mixture in an atmosphere inert to the reaction thereby to polymerize it.
Claim 3
Dependent Claim
15 words
The process of claim 1 wherein both R 1 and R 2 are methyl groups.
Claim 4
Dependent Claim
29 words
The process of claim 1 wherein at least 50% of the side-chain R 1 and R 2 groups consists of methyl groups, the remainder being phenyl groups and/or hydrogen.
Claim 5
Dependent Claim
31 words
The process of claim 1 wherein at least 50% of the side-chain groups bonded to Si of the polyborosiloxane consists of phenyl groups, the remainder being lower alkyl groups and/or hydrogen.
Claim 6
Dependent Claim
15 words
The process of claim 1 wherein the heating temperature is from 250° to 500° C.
Claim 7
Dependent Claim
87 words
Polycarbosilane partly containing siloxane bonds having superior thermal stability and oxidation resistance and a high residual ratio on firing in a non-oxidizing atmosphere, said polycarbosilane being composed mainly of structural units (A) and (B) below, ##STR28## wherein R 1 , R 2 , R 3 and R 4 , independently from each other, represent methyl, ethyl, phenyl or hydrogen, the ratio of (A):(B) being from 5:1 to 200:1, and having a number average molecular weight of 500 to 10,000 and an intrinsic viscosity of 0.01 to 1.50.
Claim 8
Dependent Claim
87 words
Polycarbosilane partly containing siloxane bonds having superior thermal stability and oxidation resistance and a high residual ratio on firing in a non-oxidizing atmosphere, said polycarbosilane being composed mainly of structural units (A) and (B) below, ##STR28## wherein R 1 , R 2 , R 3 and R 4 , independently from each other, represent methyl, ethyl, phenyl or hydrogen, the ratio of (A):(B) being from 5:1 to 200:1, and having a number average molecular weight of 500 to 10,000 and an intrinsic viscosity of 0.01 to 1.50.
Claim 9
Dependent Claim
123 words
A process for producing polysilane having phenyl groups as a part of the side chains, which comprises mixing one monosilane selected from (I) (CH 3 )(C 6 H 5 )SiCl 2 , (II) a mixture of 1 to 70 mole% of (CH 3 )(C 6 H 5 )SiCl 2 and the balance being (CH 3 ) 2 SiCl 2 , (III) a mixture of 1 to 50 mole% of (C 6 H 5 ) 2 SiCl 2 and the balance being (CH 3 ) 2 SiCl 2 , (IV) a mixture of (I) and (II), and (V) a mixture of (II) and (III) with at least one metal selected from sodium, lithium and potassium, and heating the mixture to induce dechlorination and polymerization.
Claim 10
Dependent Claim
123 words
A process for producing polysilane having phenyl groups as a part of the side chains, which comprises mixing one monosilane selected from (I) (CH 3 )(C 6 H 5 )SiCl 2 , (II) a mixture of 1 to 70 mole% of (CH 3 )(C 6 H 5 )SiCl 2 and the balance being (CH 3 ) 2 SiCl 2 , (III) a mixture of 1 to 50 mole% of (C 6 H 5 ) 2 SiCl 2 and the balance being (CH 3 ) 2 SiCl 2 , (IV) a mixture of (I) and (II), and (V) a mixture of (II) and (III) with at least one metal selected from sodium, lithium and potassium, and heating the mixture to induce dechlorination and polymerization.
References Cited (Backward Citations)
US4052930A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-09-02 | 1984-03-03 | 1984-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-02 | 1988-03-03 | 1988-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-02 | 1992-03-03 | 1992-09-02 | $7700.00 | Window Closed / Lapsed |