Patent US4308371A successfully refreshed from Google Patents.
US4308371A
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Process for preparing thermosetting organopolysiloxane
Assignee: Daicel Corp
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Filing: 1980-05-30
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Granted: 1981-12-29
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Expires: 2000-05-30
Abstract
Abstract A process for preparing a thermosetting organopolysiloxane which is soluble in an organic solvent, comprising subjecting to a hydrolyzing condensation reation one or a mixture of two or more alkoxysilanes having the formula R.sub.a.sup.1 Si(OR.sup.2).sub.4-a in which R 1 is selected from the group consisting of alkyl, substituted alkyl, alkenyl and aryl; R 2 is alkyl having 1 to 4 carbon atoms; and a is an integer of 0, 1 or 2, in the presence, from the initial stage of the reaction, of a hydrolzyed partial condensation product of trialkoxysilane having the above-identified formula in which a is 1.
Inventors
- 👤 Kazunobu Tanaka
- 👤 Koichiro Arita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:54
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/06; C08G77/08; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31507; Y10T428/31855; Y10T428/31971
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
185 words
In a process for preparing a thermosetting organopolysiloxane which is soluble in an organic solvent, which comprises effecting, in the presence of a catalyst, a hydrolysis and condensation reaction of one or a mixture of two or more alkoxysilanes having the formula R.sub.a.sup.1 Si(OR.sup.2).sub.4-a in which R 1 is alkyl, substituted alkyl, alkenyl or aryl, R 2 is alkyl having 1 to 4 carbon atoms and a is an integer of 0, 1 or 2, in which the reaction system for said hydrolysis and condensation reaction contains from 4-a/2 to 10 moles of water, per mole of said alkoxysilane, until said thermosetting organopolysiloxane is obtained, the improvement wherein the catalyst is a hydrolyzed partial condensation product of a trialkoxysilane which is soluble in an organic solvent and which has the formula R 1 Si(OR 2 ) 3 , wherein R 1 and R 2 have the same meanings as defined above, said catalyst being present in the reaction system for the beginning of said hydrolysis and condensation reaction in an amount at least 0.1 part by weight, per 100 parts by weight of said alkoxysilane.
Claim 2
Dependent Claim
185 words
In a process for preparing a thermosetting organopolysiloxane which is soluble in an organic solvent, which comprises effecting, in the presence of a catalyst, a hydrolysis and condensation reaction of one or a mixture of two or more alkoxysilanes having the formula R.sub.a.sup.1 Si(OR.sup.2).sub.4-a in which R 1 is alkyl, substituted alkyl, alkenyl or aryl, R 2 is alkyl having 1 to 4 carbon atoms and a is an integer of 0, 1 or 2, in which the reaction system for said hydrolysis and condensation reaction contains from 4-a/2 to 10 moles of water, per mole of said alkoxysilane, until said thermosetting organopolysiloxane is obtained, the improvement wherein the catalyst is a hydrolyzed partial condensation product of a trialkoxysilane which is soluble in an organic solvent and which has the formula R 1 Si(OR 2 ) 3 , wherein R 1 and R 2 have the same meanings as defined above, said catalyst being present in the reaction system for the beginning of said hydrolysis and condensation reaction in an amount at least 0.1 part by weight, per 100 parts by weight of said alkoxysilane.
Claim 3
Dependent Claim
28 words
A process as claimed in claim 1, in which said hydrolyzed partial condensation product of said trialkoxysilane is the sole catalyst employed in said hydrolysis and condensation reaction.
Claim 4
Dependent Claim
30 words
A process as claimed in claim 1 in which said alkoxysilane is selected from the group consisting of dimethyldiethoxysilane, diethyldiethoxysilane, methyltriethoxysilane, ethyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-methacryloxytrimethoxysilane, N-β-aminoethyl-γ-aminopropyltrimethoxysilane, vinyltriethoxysilane, phenyltriethoxysilane, tetraethoxysilane and tetrabutoxysilane.
Claim 5
Dependent Claim
29 words
A process as claimed in claim 1 in which the amount of said catalyst is at least 0.5 part by weight, per 100 parts by weight of said alkoxysilane.
Claim 6
Dependent Claim
31 words
A process as claimed in claim 1 in which the reaction system for said hydrolysis and condensation reaction contains from 2 to 5 moles of water, per mole of said alkoxysilane.
References Cited (Backward Citations)
US3759867A
Cited
US3792012A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-12-28 | 1985-06-29 | 1985-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-28 | 1989-06-29 | 1989-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-28 | 1993-06-29 | 1993-12-29 | $7700.00 | Window Closed / Lapsed |