Silicone sealants having reduced color

Details Silicone sealants having reduced color Silicone sealants having reduced color

C - Chemistry, Metallurgy

08

L

400/7225

C08L 83/06 (2006.01) C08K 5/37 (2006.01) C08K 5/54 (2006.01) C09K 3/10 (2006.01)

Patent

CA 2001026

A chelated titanium catalyst can be improved by the addition of an additive selected from the group consisting of organomercaptans of the formula RSH, where R is a hydrocarbon radical containing from 3 to 12 carbon atoms and mercapto containing silanes of the formula HSR'SiX3, where R~ is a divalent hydrocarbon radical having from 1 to 8 carbon atoms and X is an 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.

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