| abstract |
Photocurable composition curable by ultraviolet (UV) radiation comprising: A) at least one organosiloxane component A of the following formula (I): whereby Pa and Pb are each independently selected from a cationically polymerizable group, x+y is an integer ≧1, Sp and Sp′ are each independently selected from a cycloaliphatic hydrocarbon group and an aliphatic linear or branched hydrocarbon group, R 1 and R 2 are each independently linear or branched aliphatic or cycloaliphatic, alkoxy, aromatic or hetero aromatic groups; B) at least one second organosiloxane component B of the following formula (II): whereby n is an integer ranging from 7 to 300, x+y is an integer ≧1, Pa and Pb are each independently selected from a cationically polymerizable group, Sp and Sp′ are each independently selected from a cycloaliphatic hydrocarbon group and aliphatic linear or branched hydrocarbon group, R 1 , R 2 , R 3 , R 4 are each independently linear or branched aliphatic or cycloaliphatic, alkoxy, aromatic or hetero aromatic group; C) at least one epoxy and/or oxetane component C without siloxane groups; D) at least one cationic photoinitiator D. |