US4962174A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of alkoxysilethylene endblocked polydiorganosiloxane
Assignee: Dow Silicones Corp
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Filing: 1990-01-18
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Granted: 1990-10-09
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Expires: 2010-01-18
Abstract
Abstract A method of producing alkoxysilethylene endblocked polydiorganosiloxane consists essentially of first reacting hydroxyl endblocked polydiorganosiloxane with an excess of a SiH compound having from 2 to 4 SiH groups in the presence of a platinum catalyst, then reacting that product with vinyltrialkoxysilane to give the desired polymer.
Inventors
- 👤 Carl J. Bilgrien
- 👤 Daniel T. Berg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:34
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/48; C08G77/50; C08G77/04; C08G77/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
193 words
A method of producing an alkoxysilethylene endblocked polydiorganosiloxane consisting essentially of (A) mixing hydroxyl endblocked polydiorganosiloxane with sufficient SiH compound having from 2 to 4 inclusive SiH groups to react with the hydroxyl groups of the polydiorganosiloxane without an appreciable increase in molecular weight of the starting polymer and a platinum catalyst, then heating to a temperature of from 25° to 150° C. for a time sufficient to react all of the hydroxyl groups of the polydiorganosiloxane, then (B) stripping the excess SiH compound from the mixture by applying a vacuum of less than 25 mm of mercury and heating to a temperature of from 25° to 150° C., to leave a SiH endblocked polymer, then (C) adding sufficient vinyltrialkoxysilane to react with the SiH groups on the polymer of step (B), heating to a temperature of from 25° to 150° C. for a period of time sufficient to react all of the SiH groups present, then (D) stripping the excess vinyltrialkoxysilane from the mixture by applying a vacuum of less than 25 mm of mercury and heating to a temperature of from 25 to 150° C., to leave a trialkoxysilethylene endblocked polydiorganosiloxane.
Claim 2
Independent Claim
193 words
A method of producing an alkoxysilethylene endblocked polydiorganosiloxane consisting essentially of (A) mixing hydroxyl endblocked polydiorganosiloxane with sufficient SiH compound having from 2 to 4 inclusive SiH groups to react with the hydroxyl groups of the polydiorganosiloxane without an appreciable increase in molecular weight of the starting polymer and a platinum catalyst, then heating to a temperature of from 25° to 150° C. for a time sufficient to react all of the hydroxyl groups of the polydiorganosiloxane, then (B) stripping the excess SiH compound from the mixture by applying a vacuum of less than 25 mm of mercury and heating to a temperature of from 25° to 150° C., to leave a SiH endblocked polymer, then (C) adding sufficient vinyltrialkoxysilane to react with the SiH groups on the polymer of step (B), heating to a temperature of from 25° to 150° C. for a period of time sufficient to react all of the SiH groups present, then (D) stripping the excess vinyltrialkoxysilane from the mixture by applying a vacuum of less than 25 mm of mercury and heating to a temperature of from 25 to 150° C., to leave a trialkoxysilethylene endblocked polydiorganosiloxane.
Claim 3
Dependent Claim
17 words
The method of claim 1 in which the SiH compound used in step (A) is a tetraalkyldisiloxane.
Claim 4
Dependent Claim
11 words
The method of claim 2 in which the tetraalkyldisiloxane is tetramethyldisiloxane.
Claim 5
Dependent Claim
11 words
The method of claim 3 in which the vinyltrialkoxysilane is vinyltrimethoxysilane.
Claim 6
Dependent Claim
19 words
The method of claim 1 in which the reaction temperature of step (A) is from 50° to 100° C.
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) | 1993-10-08 | 1994-04-09 | 1994-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-08 | 1998-04-09 | 1998-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-08 | 2002-04-09 | 2002-10-09 | $7700.00 | Window Closed / Lapsed |