Silicone sealants having reduced color

Details Silicone sealants having reduced color Silicone sealants having reduced color

1988-11-28

1990-03-06

Marquis, Melvyn I.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From silicon reactant having at least one...

528 18, 528 23, C08G 7706

Patent

active

049067192

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.sub.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.

REFERENCES:
patent: 3845161 (1974-10-01), Beers
patent: 4391937 (1983-07-01), Falender et al.
patent: 4438039 (1984-03-01), Beers
patent: 4487907 (1984-12-01), Fukagama et al.

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