Epoxy group-containing organopolysiloxane, ultraviolet curable silicone composition, and method of forming a cured film

Abstract

An epoxy group-containing organopolysiloxane shows the following average composition formula (1) and has an epoxy equivalent of 500 g/mol or more. The epoxy group-containing organopolysiloxane has excellent ultraviolet curability even when the content of epoxy group is small (when the epoxy equivalent is large), an ultraviolet curable silicone composition uses the same, and a method forms a cured film. In the formula, each R1 represents the same or different unsubstituted or substituted monovalent hydrocarbon group having 1 to 10 carbon atoms (except for a group containing an epoxy group); R2 represents a group containing an epoxy group; R3 represents a hydrogen atom or a saturated monovalent hydrocarbon group having 1 to 4 carbon atoms; “a”, “b”, and “c” are positive numbers, “d” is 0 or a positive number, satisfying (a+b)/(c+d)=0.5 to 1.0.

Dependencies are inferred from the claim text.