Organopolysiloxane composition

Abstract

Provided is a hydrosilylation reactive composition and a method for producing a semi-cured product and a cured product using the hydrosilylation reactive composition, which exhibit sharp curability during the reaction while maintaining pot life and can provide a molecular design through the reaction control of the MH unit/DH unit. The composition comprises: (A) a compound containing at least one monovalent hydrocarbon group having an aliphatic unsaturated bond per molecule; (B) a compound containing at least two hydrogen atoms bonded to silicon atoms per molecule; (C) a first hydrosilylation catalyst; and (D) a second hydrosilylation catalyst which microencapsulates component (C) with a thermoplastic resin having a softening point within the temperature range of 50 to 200° C. and exhibits activity at temperatures higher than that of component (C). Also provided is a method for carrying out a hydrosilylation reaction at temperatures of two stages using the composition.

Dependencies are inferred from the claim text.