US4727170A
Expired / Lapsed
US
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Dimethylphenylsilylmethylpolysilane and method for producing the same
Assignee: Yuki Gosei Kogyo Co Ltd
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Filing: 1987-06-23
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Granted: 1988-02-23
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Expires: 2007-06-23
Abstract
Abstract A dimethylphenysilylmethylpolysilane is prepared by condensating 1,1-dichloro-1,2,2-trimethyl-2-phenyldisilane in the presence of an alkali metal or alkali earth metal, in an aprotic solvent. This polymer is a viscous liquid which has a weight average molecular weight in the range of from 5,000 to 500,000 and a narrow molecular weight distribution, and has various uses as electroconductors, photoresist and optical information recording materials.
Inventors
- 👤 Yoichiro Nagai
- 👤 Hamao Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 00:17
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/60
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
32 words
A dimethylphenylsilylmethylpolysilane having a repeating unit represented by the formula [I] and having a weight average molecular weight of from 5,000 to 500,000: ##STR4## wherein, Ph is phenyl and Me is methyl.
Claim 2
Dependent Claim
32 words
A dimethylphenylsilylmethylpolysilane having a repeating unit represented by the formula [I] and having a weight average molecular weight of from 5,000 to 500,000: ##STR4## wherein, Ph is phenyl and Me is methyl.
Claim 3
Dependent Claim
22 words
The dimethylphenylsilylmethylpolysilane according to claim 1 in which the ratio of weight average molecular weight to number average molecular weight is 1.6.
Claim 4
Independent Claim
75 words
A method for producing a dimethylphenylsilylmethylpolysilane having a repeating unit represented by the formula [I]: ##STR5## wherein, Ph is phenyl and Me is methyl, and having a weight average molecular weight of from 5,000 to 500,000, which comprises the step of condensating 1,1-dichloro-1,2,2-trimethyl-2-phenyldisilane represented by the formula [II]: PhMe.sub.2 SiSiCl.sub.2 Me [II] wherein, Ph is phenyl and Me is methyl, in the presence of an alkaline metal or alkali earth metal, in an aprotic solvent.
Claim 5
Independent Claim
75 words
A method for producing a dimethylphenylsilylmethylpolysilane having a repeating unit represented by the formula [I]: ##STR5## wherein, Ph is phenyl and Me is methyl, and having a weight average molecular weight of from 5,000 to 500,000, which comprises the step of condensating 1,1-dichloro-1,2,2-trimethyl-2-phenyldisilane represented by the formula [II]: PhMe.sub.2 SiSiCl.sub.2 Me [II] wherein, Ph is phenyl and Me is methyl, in the presence of an alkaline metal or alkali earth metal, in an aprotic solvent.
Claim 6
Dependent Claim
33 words
The method according to claim 3 in which 2 to 3 equivalents of said alkaline metal or alkali earth metal are used per 1 equivalent of said 1,1-dichloro-1,2,2-trimethyl-2-phenyldisilane represented by the formula [II].
Claim 7
Dependent Claim
21 words
The method according to claim 3 in which said aprotic solvent is any one of n-pentane, n-hexane, benzene, toluene and tetrahydrofuran.
Claim 8
Dependent Claim
15 words
The method according to claim 3 in which said alkali metal is lithium or sodium.
Claim 9
Dependent Claim
14 words
The method according to claim 3 in which said alkaline earth metal is magnesium.
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) | 1991-02-22 | 1991-08-24 | 1992-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-22 | 1995-08-24 | 1996-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-22 | 1999-08-24 | 2000-02-23 | $7700.00 | Window Closed / Lapsed |