Process for controlling the rate of platinum induced...

Details Process for controlling the rate of platinum induced... Process for controlling the rate of platinum induced...

C - Chemistry, Metallurgy

08

G

400/4105, 402/9

C08G 77/38 (2006.01) C08F 283/12 (2006.01) C08J 3/24 (2006.01) C08L 83/04 (2006.01)

Patent

CA 1099845

ABSTRACT OF THE DISCLOSURE A process for controlling the rate of addition of silicon bonded hydrogen atoms to organopolysiloxanes containing aliphatic unsaturation is provided herein. The process comprises mixing (1) an organopolysiloxane containing silicon bonded hydrogen atoms and/or (2) an organopolysiloxane containing at least 50 silicon atoms per molecule and having aliphatically unsaturated groups with at least one organosilicon compound of the formula CH2=CHR2SiO(SiR2O)nSiR2CH=CH2 in which R is a hydrocarbon radical or a substituted hydrocarbon radical free of aliphatic unsaturation and n is a number of from 0 to 6 prior to combining the organopolysiloxanes (1) and (2) in the presence of a platinum catalyst. The composition thus obtained has a substantially longer pot- life while only slightly extending the curing time.

288790

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