US4731411A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing alkoxy-terminated polysiloxanes
Assignee: General Electric Co
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Filing: 1986-06-16
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Granted: 1988-03-15
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Expires: 2006-06-16
Abstract
Abstract The present invention relates to a alkoxy-functional one-component RTV composition. In particular, there is disclosed processes for producing an alkoxy-terminated diorganopolysiloxane by reacting a vinyl or silanol containing siloxane with an alkoxy-functional hydride containing silane in the presnce of a platinum catalyst.
Inventors
- 👤 Gary M. Lucas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:40
CPC Classifications
C; C08; C08L; C08L83/00; C08L83/04; C08G; C08G77/00; C08G77/04; C08G77/14; C08G77/18; C08G77/12; C08G77/16; C08G77/20; C08G77/70
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
88 words
A process for producing alkoxy-terminated polysiloxanes which can be used to produce RTV silicone rubber compositions, comprising, anhydrously reacting (1) a silanol-terminated diorganopolysiloxane having a viscosity in the range of 100 to 1,000,000 centipoise at 25° C. where the organo groups are monovalent hydrocarbon radicals with (2) a polyalkoxy cross-linking agent of the formula, ##STR16## where R 1 is a C.sub.(1-8) monovalent hydrocarbon radical, R 2 is a C.sub.(1-13) monovalent hydrocarbon radical, b is 0, 1 or 2; (3) in the presence of a platinum or platinum-containing catalyst.
Claim 2
Dependent Claim
88 words
A process for producing alkoxy-terminated polysiloxanes which can be used to produce RTV silicone rubber compositions, comprising, anhydrously reacting (1) a silanol-terminated diorganopolysiloxane having a viscosity in the range of 100 to 1,000,000 centipoise at 25° C. where the organo groups are monovalent hydrocarbon radicals with (2) a polyalkoxy cross-linking agent of the formula, ##STR16## where R 1 is a C.sub.(1-8) monovalent hydrocarbon radical, R 2 is a C.sub.(1-13) monovalent hydrocarbon radical, b is 0, 1 or 2; (3) in the presence of a platinum or platinum-containing catalyst.
Claim 3
Dependent Claim
22 words
The process of claim 1 wherein there is present at least 100% excess of the polyalkoxy cross-linking agent in the reaction mixture.
Claim 4
Dependent Claim
53 words
The process of claim 2 wherein the silanol-terminated diorganosiloxane has the formula, ##STR17## where each R is independently selected from the group consisting of aryl radicals, halogenated aryl radicals, alkyl radicals, cycloaliphatic radicals, alkenyl radicals, and cyanoalkyl radicals and n is an integer having a value of from about 50 to about 2,500.
Claim 5
Dependent Claim
20 words
The process of claim 1 wherein the reaction is carried out at a temperature in the range of 50°-150° C.
Claim 6
Dependent Claim
21 words
The process of claim 1 wherein the reaction is carried out in a time period of 30 minutes to 2 hours.
Claim 7
Dependent Claim
14 words
The process of claim 1 wherein the reaction is carried out at atmospheric pressure.
Claim 8
Dependent Claim
16 words
The process of claim 1 wherein the reaction is carried out in an inert organic solvent.
Claim 9
Dependent Claim
18 words
The process of claim 7 wherein after the reaction has proceeded to completion, the solvent is stripped off.
Claim 10
Dependent Claim
37 words
The process of claim 8 wherein after the solvent is stripped off, there is anhydrously added to the composition from 1 to 700 parts by weight of a treated filler per 100 parts by weight of organopolysiloxane.
Claim 11
Dependent Claim
13 words
The process of claim 9 wherein the filler is silazane treated fumed silica.
Claim 12
Dependent Claim
24 words
The process of claim 1 wherein there is present from 1 to 500 parts per million of platinum as a solubilized platinum complex catalyst.
Claim 13
Dependent Claim
17 words
The process of claim 11 wherein the solubilized platinum catalyst is platinum complexed with a tetravinyl dimethyldisiloxane.
Claim 14
Dependent Claim
22 words
The process of claim 8 wherein the hydrogen gas that is formed in the process is continuously stripped off during the reaction.
Claim 15
Dependent Claim
28 words
The process of claim 3 wherein said R is selected from the group consisting of phenyl, naphthyl, methyl, ethyl, propyl, cyclohexyl, cyclobutyl, vinyl, allyl, cyanoethyl, cyanopropyl and cyanobutyl.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-03-15 | 1991-09-14 | 1992-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-15 | 1995-09-14 | 1996-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-15 | 1999-09-14 | 2000-03-15 | $7700.00 | Window Closed / Lapsed |