;wherein;a is 1 or 2; Ar and Ar1 inter alia are phenyl; Ar2 inter alia is phenylene, these groups being unsubstituted or substituted; X is a direct bond, O, S or N(R6); Y inter alia is hydrogen or C1-C12alkyl; M1 is NR3R4 or OH, or M1 is Ar when R1 and R2 are alkoxy, or aryloxy; R1 and R2 independently of one another e.g. are C1-C8alkyl; R3 and R4 for example are C1-C12alkyl, or together are C3-C7alkylene; R5 inter alia is C1-C6alkylene or a direct bond; R6 is for example hydrogen; and Z is a divalent radical, provided that at least one of the radicals Ar, Ar1, Ar2, R1, R2, R3, R4, R5 or Y is substituted by SH groups;;are suitable for the thermal preparation of macrophotoinitiators which are polymerized photochemically to give block-copolymers."/>
Photoinitiators having chain transfer groups polymerized to obtain macrophotoinitiators useful to give block copolymers
Compounds with chain transfer groups of the formula I, II, III and IV ;wherein;a is 1 or 2; Ar and Ar1 inter alia are phenyl; Ar2 inter alia is phenylene, these groups being unsubstituted or substituted; X is a direct bond, O, S or N(R6); Y inter alia is hydrogen or C1-C12alkyl; M1 is NR3R4 or OH, or M1 is Ar when R1 and R2 are alkoxy, or aryloxy; R1 and R2 independently of one another e.g. are C1-C8alkyl; R3 and R4 for example are C1-C12alkyl, or together are C3-C7alkylene; R5 inter alia is C1-C6alkylene or a direct bond; R6 is for example hydrogen; and Z is a divalent radical, provided that at least one of the radicals Ar, Ar1, Ar2, R1, R2, R3, R4, R5 or Y is substituted by SH groups;;are suitable for the thermal preparation of macrophotoinitiators which are polymerized photochemically to give block-copolymers.
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