Patent US4906719A successfully refreshed from Google Patents.
US4906719A
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Silicone sealants having reduced color
Assignee: Dow Silicones Corp
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Filing: 1988-11-28
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Granted: 1990-03-06
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Expires: 2008-11-28
Abstract
Abstract A chelated titanium catalyst can be improved by the addition of an additive selected from the group consisting of organomercaptan of the formula RSH, where R is a hydrocarbon radical containing from 3 to 12 carbon atoms, and mercapto containing silane of the formula HSR'SiX 3 , where R' is a divalent hydrocarbon having from 1 to 8 carbon atoms and X is alkoxy radical having 1 to 6 carbon atoms. The improved composition has a reduced tendency to develop color upon storage. The improved composition is particularly useful in a silicone composition comprising a hydroxyl endblocked polydiorganosiloxane and an alkoxysilane or mixture of alkoxysilanes, or in a silicone composition comprising an alkoxy endblocked polydiorganosiloxane.
Inventors
- 👤 Hsien-Kun Chu
- 👤 Russell P. Kamis
- 👤 Jerome M. Klosowski
- 👤 Loren D. Lower
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:21
CPC Classifications
C; C08; C08K; C08K5/00; C09; C09K; C09K3/00; C09K3/10; C09K3/1006; C09K3/1018; C08K5/36; C08K5/37; C08K5/54; C08K5/5406
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
106 words
In an elastometric composition comprising (i) a hydroxyl endblocked polydiorganosiloxane and a silane or mixture of silanes having an average of from 2.01 to 4 inclusive alkoxy radicals, or an alkoxy endblocked polydiorganosiloxane, and (ii) a chelated titanium catalyst, wherein the improvement comprises the addition of an additive selected from the group consisting of organomercaptan of the formula RSH, where R is a hydrocarbon radical containing from 3 to 12 carbon atoms, and mercapto containing silane of the formula HSR'SiX 3 , where R' is a divalent hydrocarbon having from 1 to 8 carbon atoms and X is alkoxy radical having 1 to 6 carbon atoms.
Claim 2
Dependent Claim
106 words
In an elastometric composition comprising (i) a hydroxyl endblocked polydiorganosiloxane and a silane or mixture of silanes having an average of from 2.01 to 4 inclusive alkoxy radicals, or an alkoxy endblocked polydiorganosiloxane, and (ii) a chelated titanium catalyst, wherein the improvement comprises the addition of an additive selected from the group consisting of organomercaptan of the formula RSH, where R is a hydrocarbon radical containing from 3 to 12 carbon atoms, and mercapto containing silane of the formula HSR'SiX 3 , where R' is a divalent hydrocarbon having from 1 to 8 carbon atoms and X is alkoxy radical having 1 to 6 carbon atoms.
Claim 3
Dependent Claim
29 words
The composition of claim 1 in which the additive is an organomercaptan of the formula RSH where R is a hydrocarbon radical containing from 3 to 12 carbon atoms.
Claim 4
Dependent Claim
11 words
The composition of claim 2 in which the organomercaptan is dodecylmercaptan.
Claim 5
Dependent Claim
44 words
The composition of claim 1 in which the additive is a mercapto containing silane of the formula HSR'SiX 3 , where R' is a divalent hydrocarbon having from 1 to 8 carbon atoms and X is alkoxy radical having 1 to 6 carbon atoms.
Claim 6
Dependent Claim
13 words
The composition of claim 4 in which the mercapto containing silane is mercaptopropyltrimethoxysilane.
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) | 1993-03-05 | 1993-09-04 | 1994-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-05 | 1997-09-04 | 1998-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-05 | 2001-09-04 | 2002-03-06 | $7700.00 | Window Closed / Lapsed |