Radiation curable silicone composition

A radiation curable composition, comprising, based on 100 parts by weight of the composition:

• (A) from 90 parts by weight to 99.9 parts by weight of an epoxy functional silicone comprising one or more of:
• (i) an epoxy-functional silicone polymer or copolymer according to the structural formula (II):
• MEDEaDbME (II)
• wherein:
• ME is R92R10SiO1/2;
• D is and R112SiO;
• DE is R12R13SiO;
• each R9, R11 and R12 is independently alkyl, aryl, haloalkyl and hydroxyalkyl;
• each R10 and R13 is independently alkylene epoxycycloalkyl or glycidoxyalkyl;
• and
• a and b are each independently integers from 10 to 250,
• (ii) an epoxy-functional silicone polymer or copolymer according to the structural formula (III):
• MDEcDdM (III)
• wherein:
• M is R143SiO1/2;
• each R14 is independently alkyl, aryl, haloalkyl and hydroxyalkyl,
• D and DE are each defined as above in (a), and
• c and d are each independently integers from 50 to 500,
• (iii) an oxo acid modified epoxysilicone polymer or copolymer made by reaction of an epoxy-functional silicone according to formula (II) or (III) with less than its epoxy molar equivalent of one or more polyether-carboxylic acids, and
• (iv) a non-fluorescing polycyclic aromatic-modified epoxysilicone polymer or copolymer made by reaction of an epoxy-functional silicone according to formula (II) or (III) with less than its molar equivalent, based on epoxy functionality, of a compound selected from the group consisting of R16COOH, (R16CO)2O,R16COX, R16SO3H or R16SO2X, wherein R16 is a monovalent polycyclic aromatic hydrocarbon radical and X is halo;
• (B) from 0.05 parts by weight to 8 parts by weight of a photocatalyst selected from the group consisting of sulfonium salts, iodonium salts and azonium salts, and
• (C) from 0.05 parts by weight to 2 parts by weight of a non-fluorescing polycyclic aromatic compound comprising a compound of the structural formula:
• wherein R1, R2, R3, R4, R5, R6, R7 and R8 are each independently H, halo, hydroxy, alkoxy, alkylamido, monovalent glycidyl ether or monovalent hydrocarbon radical, provided that at least one of R1, R2, R3, R4, R5, R6, R7 and R8 is a hydroxy, alkoxy or monovalent glycidyl ether radical.