Ultraviolet curable silicone adhesive composition and silicone adhesive film

A UV-curable silicone pressure-sensitive adhesive composition comprising

• (A) 30 to 70 parts by weight of an organopolysiloxane resin (A) comprising (a) R13SiO1/2 units wherein R1 is a substituted or unsubstituted C1-C10 monovalent hydrocarbon group and (b) SiO4/2 units, wherein a molar ratio of units (a) to units (b) is from 0.6:1 to 1.2:1,
• (B) 1 to 40 parts by weight of a linear or branched organopolysiloxane (B) having a backbone composed of repeating diorganosiloxane units and containing an average of 1 to 4 monovalent substituent groups per molecule, the monovalent substituent groups having the general formula (4):
• wherein R2 is hydrogen or methyl, R3 is independently a substituted or unsubstituted C1-C10 monovalent hydrocarbon group, X is a C2-C6 alkylene group, a is an integer of 1 to 3, b is 1 or 2, and the broken line designates a valence bond to a silicon atom,
• the organopolysiloxane (B) having a viscosity at 25° C. of from more than 50 mPa·s to 500,000 mPa·s, and
• (C) 1 to 40 parts by weight of a reactive diluent, the reactive diluent being an organopolysiloxane (C) containing one monovalent group having the general formula (3):
• wherein a is as defined above and the broken line designates a valence bond to a silicon atom at an end or on a side chain of the organopolysiloxane (C) molecular chain, the organopolysiloxane (C) having a viscosity at 25° C. of 1 to 50 mPa·s,
• with the proviso that the total amount of organopolysiloxane resin (A), organopolysiloxane (B), and organopolysiloxane (C) is 100 parts by weight.