UV-curable organopolysiloxane composition and use thereof

An ultraviolet (UV) curable organopolysiloxane composition, comprising:

• (A) an organosiloxane having an average of two or more UV reactive functional groups in one molecule and conforming to the general formula (3):
• where each of R1 to R8 is independently a monovalent hydrocarbon group unsubstituted or substituted with fluorine, with the proviso that at least each of R2 and R7 is a UV reactive functional group;
• and n is 0;
• (B) an organosiloxane having one UV reactive functional group in one molecule and conforming to the general formula (3′):
• where each of R1 to R8 is independently a monovalent hydrocarbon group unsubstituted or substituted with fluorine, provided that one of R4 or R5 is a UV reactive functional group;
• and
• n is 1;
• and
• a non-volatile low molecular weight compound having a molecular weight of 500 or less and having an alkenyl group and an epoxy group;
• wherein an organic solvent is not included in the composition;
• and
• wherein the viscosity of the composition, as measured at 25° C. using an E type viscometer, is 5 to 20 mPa·s.