EPOXIDIZED ORGANOPOLYSILOXANE, ULTRAVIOLET-CURABLE SILICONE COMPOSITION, AND METHOD FOR FORMING CURED COATING FILM

摘要

The present invention is an epoxy group-containing organopolysiloxane shown by the following average composition formula (1) and having an epoxy equivalent of 500 g/mol or more. This provides an epoxy group-containing organopolysiloxane with excellent ultraviolet curability even when the content of epoxy group is small (when the epoxy equivalent is large), an ultraviolet curable silicone composition using the same, and a method of forming 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.