Patent ID: 6783858
Filing Date: 2004-08-31
Classification: C08G,C08L,Y10T

Abstract:
A curable organopolysiloxane composition having selective adhesion to a substrate, said composition containing the following components:(A) an organopolysiloxane polymer; wherein there is up to 100 parts by weight of the organopolysiloxane polymer having a viscosity of about 10,000 to about 10,000,000 centipoises at 25Â° C. with sufficient vinyl, or mixtures of such organopolysiloxane to provide functional reactivity with a crosslinker organohydrogenpolysiloxane; (B) an organohydrogenpolysiloxane crosslinker; wherein there is from 0.3 to 40 parts by weight of the organohydrogenpolysiloxane crosslinker containing at least two silicon-bonded hydrogens per molecule; (C) a platinum group metal catalyst; wherein there is a catalytically effective amount of the platinum group metal catalyst; (D) a cure inhibitor; wherein there is from 0.01 to 3 parts by weight of the cure inhibitor of the type ethynyl cyclohexanol; (E) an adhesion promoter; wherein there is from 0.01 to 30 parts by weight of a compound comprising at least one hydroxy group and in the same molecule at least one substituent selected from a group consisting of silicon hydride, alkenyl, and acryl; (F) an epoxy functional compound; wherein there is from 0.01 to 30 parts by weight of the epoxy functional compound; and (G) a compound selected from the group consisting of soluble polydiorganosiloxanes, polycycloorganosiloxanes, glycols, and mixtures thereof; wherein there is up to about 10 parts by weight based upon the total composition of a mold release agent compound that is selected from the group consisting of soluble fluid polydiorganosiloxanes, polycycloorganosiloxanes (linear and cyclic), hydroxy end blocked hydrocarbons and having a molecular distribution such that the viscosity is 50 to 10,000 centipoises at 25Â° C.