Patent US5196497A successfully refreshed from Google Patents.
US5196497A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of alkoxy-terminated poly-(diorganosiloxanes)
Assignee: Bayer AG
•
Filing: 1991-07-08
•
Granted: 1993-03-23
•
Expires: 2011-07-08
Abstract
Abstract The present invention relates to a process for the production of diorganyloxyorganosilyl- or triorganyloxysilyl-terminated poly(di-organosiloxanes) by reaction of α,ω-dihydroxypoly(diorganosiloxanes) with alkoxysilanes in the presence of catalytically active strong alkali metal bases.
Inventors
- 👤 Wilhelm Weber
- 👤 Theo Achtenberg
- 👤 Karl-Heinz Sockel
- 👤 Hans Sattlegger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:11
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/06; C08G77/32; C08G77/14; C08G77/18
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
82 words
A process for the production of triorganyloxysilyl- or diorganyloxyorganosilyl-terminated poly(diorganosiloxanes) by reacting α,χ-dihydroxypoly(dimethylsiloxanes) with tetraorganyloxysilanes or triorganyloxyorganosilanes of the formula R.sup.1.sub.m Si(OR.sup.2).sub.4-m wherein m is 0 or 1, R 1 is an alkyl, aryl or alkenyl radical and R 2 is an alkyl radical wherein the process comprises conducting the reaction in the presence of a catalyst consisting of a strongly basic alkali metal compound and neutralizing the reaction mixture after the desired reaction but prior to the occurance of polymer rearrangements.
Claim 2
Dependent Claim
82 words
A process for the production of triorganyloxysilyl- or diorganyloxyorganosilyl-terminated poly(diorganosiloxanes) by reacting α,χ-dihydroxypoly(dimethylsiloxanes) with tetraorganyloxysilanes or triorganyloxyorganosilanes of the formula R.sup.1.sub.m Si(OR.sup.2).sub.4-m wherein m is 0 or 1, R 1 is an alkyl, aryl or alkenyl radical and R 2 is an alkyl radical wherein the process comprises conducting the reaction in the presence of a catalyst consisting of a strongly basic alkali metal compound and neutralizing the reaction mixture after the desired reaction but prior to the occurance of polymer rearrangements.
Claim 3
Dependent Claim
24 words
A process according to claim 1 wherein the catalyst is selected from the group consisting of hydroxides, alcoholates and silanolates of sodium or potassium.
Claim 4
Dependent Claim
33 words
A process according to claim 1 wherein the neutralization is carried out using an effective amount of a component selected from the group consisting of strong acids, weak acids, and acid releasing compositions.
Claim 5
Dependent Claim
42 words
A process according to claim 1 wherein the neutralization is carried out using an effective amount of a component selected from the group consisting of HCl, H 2 SO 4 , H 3 PO 4 , carboxylic acids, CO 2 and chlorosilanes.
Claim 6
Dependent Claim
19 words
A process according to claim 1 wherein the neutralizing agent is used in excess quantity to that stociometrically required.
Claim 7
Dependent Claim
32 words
A process according to claim 1 wherein the base and neutralizing agent are each introduced into the reaction medium in dilute form in a carrier which is miscible with the reaction medium.
Claim 8
Dependent Claim
41 words
A process according to claim 1 wherein R 1 group of the silane compounds is substituted with a group selected from the group consisting of --SH, --NH 2 , H 2 NCH 2 CH 2 NH--,CH 2 ═C(CH 3 )COO--, ##STR3##
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) | 1996-03-22 | 1996-09-21 | 1997-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-03-22 | 2000-09-21 | 2001-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-03-22 | 2004-09-21 | 2005-03-23 | $7700.00 | Window Closed / Lapsed |