Ultraviolet-curable silicone composition containing a polyorganosiloxane terminated with a silanol group at both ends or an alcohol-modified polyorganosiloxane

Claim 1

An ultraviolet-curable silicone composition comprising: (A) 100 parts by weight of a polyorganosiloxane comprising structural units represented by the general formula R 1 m R 2 n SiO.sub.(4-m-n)/2 wherein R 1 's , which may be the same or different, each represents a monovalent hydrocarbon group, R 2 represents hydrogen atom, a divalent hydrocarbon group or a monovalent epoxy-functional organic group, and m and n each represents an integer of from 0 to 3, with the proviso that the sum of m and n is an integer of from 0 to 3, at least two of R 2 are epoxy-functional organic groups; (B) from 0.1 to 10 parts by weight of (a) a polyorganosiloxane having a viscosity of 1 cP to 30,000 cP at 25° C. represented by the general formula R 3 2 SiO wherein R 3 's, which may be the same or different, each represents a monovalent hydrocarbon group, which is blocked by (OH)R 3 2 Si.sub. 1/2 at the both ends thereof, or (b) an alcohol-modified polyorganosiloxane having a viscosity of from 1 cP to 30,000 cP at 25° C. containing two or more alcoholic OH groups per molecule; and (C) a catalytically effective amount of an onium salt as a photoinitiator.