Crosslinkable organopolysiloxanes and a method for preparing...

Details Crosslinkable organopolysiloxanes and a method for preparing... Crosslinkable organopolysiloxanes and a method for preparing...

C - Chemistry, Metallurgy

08

G

402/25, 204/91.3

C08G 77/04 (2006.01) C08G 77/20 (2006.01) C08G 77/28 (2006.01) C09D 183/08 (2006.01) D21H 27/00 (2006.01)

Patent

CA 1226087

CROSSLINKABLE ORGANOPOLYSILOXANES AND A METHOD FOR PREPARING THE SAME Abstract of the Disclosure Organopolysiloxanes which are crosslinked by high energy radiation consisting essentially of siloxane units of the formulas: (a) HR1C=CR2COOR3SiR2O1/2 , (b) HSR4SiRO and (c) R?SiO where R is a monovalent hydrocarbon radical or a halogenated monovalent hydrocarbon radical, R1 is hydrogen or a phenyl radi- cal or a halogenated phenyl radical, R2 is hydrogen or an alkyl radical having from 1 to 4 carbon atoms per radical and R3 is a hydrocarbon radical or a halogenated hydrocarbon radical, R4 is a divalent hydrocarbon radical, R5 is the same as R or a hydro- carbon radical substituted with the HR1C=CR2COO group, where R1 and R2 are the same as above, in which two siloxane units of the formula HR1C=CR2COOR3SiR2O1/2 are present per molecule. These organopolysiloxanes are pre- pared by equilibrating the corresponding siloxanes in accordance with the conventional methods known in the art. These organopolysiloxanes can be crosslinked by high energy radiation, for example, ultraviolet radiation, to form coatings on paper for releasing tacky substances or as coatings on optic fibers and as photocuring sealants for electronic components.

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