UV-curable adhesive organopolysiloxane composition

摘要

A UV-curable adhesive organopolysiloxane composition is provided comprising (A) (A-1) an alkenyl-containing linear organopolysiloxane and (A-2) a three-dimensionai network alkenyl-containing organopolysiloxane resin comprising R12R2SiO3/2, R13SiO1/2 and SiO2 units, wherein R1 is a monovalent hydrocarbon group exclusive of alkenyl and R2 is alkenyl, (B) (B-1) an alkoxy-free organohydrogenpolysiloxane and (B-2) an organohydrogenpolysiloxane containing at least one trialkoxysilyl group bonded to silicon via alkylene, (C) a photoactive platinum complex catalyst, and (D) a branched organopolysiloxane oligomer comprising R12R2SiO1/2 and/or R13SiO1/2 units and R1SiO3/2 units, but not SiO2 units.

主权项

1. A UV-curable, adhesive organopolysiloxane composition comprising
(A) (A-1) 50 to 90% by weight, based on component (A), of a linear organopolysiloxane having at least two silicon-bonded alkenyl groups per molecule and (A-2) 10 to 50% by weight, based on component (A), of a three-dimensional network organopolysiloxane resin comprising R12R2SiO1/2 units, R13SiO1/2 units and SiO2 units, wherein R1 is an unsubstituted or halo-substituted monovalent hydrocarbon group exclusive of alkenyl and R2 is an alkenyl group, in a molar ratio (R12R2SiO1/2+R13SiO1/2)/SiO2 of 0.5/1 to 1.5/1, and containing 5×10−3 1×10−4 mol/g of alkenyl groups, the sum of components (A-1) and (A-2) being 100% by weight. (B) (B-1) an organohydrogeripolysiloxane containing at least two silicon-bonded hydrogen atoms per molecule, but not alkoxy group, in an amount to give a molar ratio of silicon-bonded hydrogen in component (B-1) to the total of alkenyl in components (A) and (D) of 0.1/1 to 5.0/1, and (B-2) an organohydrogenpolysiloxane containing at least one trialkoxysilyl group bonded to silicon via an alkylene group and at least one silicon-bonded hydrogen atom per molecule, in an amount to give a molar ratio of silicon-bonded hydrogen in component (B-2) to the total of alkenyl groups in components (A) and (D) of 0.05/1 to 2.0/1, with the proviso that a molar ratio of silicon-bonded hydrogen in component (B) to the total of alkenyl in components (A) and (D) is from 0.5/1 to 7.0/1, (C) an effective amount of a photoactive platinum complex catalyst, and (D) a branched organopolysiloxane oligomer comprising R12R2SiO1/2 units and R1SiO3/2 units, R12R2SiO1/2 units and R1SiO3/2 units, but not SiO2 units, wherein R1 is an unsubstituted or halo-substituted monovalent hydrocarbon group exclusive of alkenyl and R2 is an alkenyl group, and containing at least two alkenyl groups per molecule, in an amount to give a molar ratio of alkenyl in component (D) to the total of alkenyl in components (A) and (D) of 0.1/1 to 0.6/1.