US4550151A
Expired / Lapsed
US
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Organoborosilicon polymer and a method for the preparation thereof
Assignee: Shin-Etsu Chemical Co Ltd
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Filing: 1984-12-05
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Granted: 1985-10-29
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Expires: 2004-12-05
Abstract
Abstract The invention provides a novel organoborosilicon polymer comprising two types of the recurring monomeric units represented by the general formulas of, one, --SiR 1 2 --CH 2 -- and, the other, --BR 2 --NR 3 --, in which R 1 , R 2 and R 3 are each a hydrogen atom or a monovalent hydrocarbon group. Such an organoborosilicon polymer is readily prepared by the thermal decomposition polymerization reaction of an organopolysilane compound and a borazine compound at 250° to 500° C. and useful as a precursor of an inorganic ceramic material or inorganic fibers or as a binder of ceramics.
Inventors
- 👤 Minoru Takamizawa
- 👤 Taishi Kobayashi
- 👤 Akira Hayashida
- 👤 Yoshihumi Takeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:25
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/60; C08G79/00; C08G79/08
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
144 words
An organoborosilicon polymer comprising a first type of the recurring monomeric units represented by the general formula --SiR 1 2 --CH 2 --, in which R 1 is a hydrogen atom or a monovalent hydrocarbon group selected from the class consisting of methyl, ethyl, vinyl and phenyl groups, and a second type of the recurring monomeric units represented by the general formula --BR 2 --NR 3 --, in which R 2 is a group selected from the class consisting of monovalent hydrocarbon groups, trihydrocarbylsilyl-substituted alkyl groups represented by the general formula --CH 2 )SiR 4 3 , R 4 being a monovalent hydrocarbon group and n being a positive integer, and substituted or unsubstituted amino groups represented by the general formula --NR 5 2 , R 5 being a hydrogen atom or a monovalent hydrocarbon group, and R 3 is a monovalent hydrocarbon group.
Claim 2
Dependent Claim
144 words
An organoborosilicon polymer comprising a first type of the recurring monomeric units represented by the general formula --SiR 1 2 --CH 2 --, in which R 1 is a hydrogen atom or a monovalent hydrocarbon group selected from the class consisting of methyl, ethyl, vinyl and phenyl groups, and a second type of the recurring monomeric units represented by the general formula --BR 2 --NR 3 --, in which R 2 is a group selected from the class consisting of monovalent hydrocarbon groups, trihydrocarbylsilyl-substituted alkyl groups represented by the general formula --CH 2 )SiR 4 3 , R 4 being a monovalent hydrocarbon group and n being a positive integer, and substituted or unsubstituted amino groups represented by the general formula --NR 5 2 , R 5 being a hydrogen atom or a monovalent hydrocarbon group, and R 3 is a monovalent hydrocarbon group.
Claim 3
Dependent Claim
28 words
The organoborosilicon polymer as claimed in claim 1 wherein the molar ratio of the silicon atoms to the boron atoms is in the range from 2:1 to 200:1.
Claim 4
Dependent Claim
181 words
A method for the preparation of an organoborosilicon polymer as claimed in claim 1 which comprises reacting an organosilicon compound having, in a molecule, at least one silicon-to-silicon linkage and at least one group denoted by R 1 , in which R 1 is a hydrogen atom or a monovalent hydrocarbon group selected from the class consisting of methyl, ethyl, vinyl and phenyl groups, bonded to the silicon atom and an organoboron compound composed of the units represented by the general formula --BR 2 --NR 3 --, in which R 2 is a group selected from the class consisting of monovalent hydrocarbon groups, trihydrocarbylsilyl-substituted alkyl groups represented by the general formula --CH 2 ) n SiR 4 3 , R 4 being a monovalent hydrocarbon group and n being a positive integer, and substituted or unsubstituted amino groups represented by the general formula --NR 5 2 , R 5 being a hydrogen atom or a monovalent hydrocarbon group, and R 3 is a monovalent hydrocarbon group, in an inert atmosphere at a temperature in the range from 250° to 500° C.
Claim 5
Dependent Claim
41 words
The method as claimed in claim 3 wherein the organoboron compound is an organoborazine compound represented by the general formula (--BR 2 --NR 3 --) 3 , wherein R 2 and R 3 each have the same meaning as defined above.
References Cited (Backward Citations)
US2885370A
Cited
US3288726A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-10-28 | 1989-04-29 | 1989-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-28 | 1993-04-29 | 1993-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-28 | 1997-04-29 | 1997-10-29 | $7700.00 | Window Closed / Lapsed |