Abstract: The invention relates to novel photoinitiators of formula (I) wherein A is —O—, —CH2?, CH(CH3)— or —C(CH3)2?, and R is methyl or trimethylsilyl, and R may in addition be hydrogen when A is simultaneously the group —C(CH3)2?. The invention relates also to compositions comprising (A) at least one ethylenically unsaturated compound, (B) a photoinitiator of formula (I), (C) optionally further binders or additives, (D) optionally further photoinitiators or co-initiators. Compositions comprising (A) an ethylenically unsaturated compound that contains at least one aminoacrylate, (B) a photoinitiator of formula (II) or (III), (C) optionally further binders or additives, (D) optionally further photoinitiators or co-initiators.

Abstract: The invention relates to a radiation curable coating or an ink composition comprising a photoinitiator and a stabilizer blend of a sterically hindered nitroxyl radical and a quinone methide.

Abstract: The invention relates to novel photoinitators of formulae (I), (II), (III), (IV), (V) and (VI) wherein R1 and R2 are each independently of the other C1-C8alkyl; C1-C4alkyl substituted by OH, C1-C4alkoxy, —COO(C1-C8alkyl), (C1-C4alkyl)-COO—, —CN, benzyl, phenyl or by —N(R15)(R16); C3-C6alkerlyl, benzyl, —CH2—C6H4—(C1-C4alkyl) or phenyl; or R1 and R2 together are unbranched or branched C2-C9alkylene or C3-C6-oxa- or -azaalkylene; R3, R4, R5 and R6 are each independently of the others hydrogen, C1-C8alkyl, C3-C6alkenyl, benzyl, —CH2—C6H4—(C1-C4alkyl) or phenyl; R3 and R4 together and/or R5 and R6 together are unbranched or branched C2-C9alkylene; A is CI, Br, —O—R9, —N(R11)(R12) or —S—R18, A? is —O—, —NH— or —NR11—; A? is CI, Br, —O—R9, —N(R11)(R12) or —S—R18 or hydrogen, X is —O—R10 or —N(R13)(R14), n is an integer from 1 to 10, preferably an integer from 1 to 4, especially 1, 2 or 3; R7 is a linker; R8 is a bivalent C2-C3alkylele radical.

Abstract: The Invention relates to novel ketones of formulae (I) and (II) wherein R1, R2, R3 and R4 are, for example, C1-C8alkyl, R5 is, for example, hydrogen, A is CI, Br, -0-R7, —NR8R9 or —S—R16, A? is —O—, —NH— or —NR8—, X and Y are each independently of the other —O—R10 or —N(R11)(R12), n is an integer from 1 to 10, R6 is, for example, an n-valent radical of linear or branched C2-C20alkyl the carbon chain of which may be interrupted by cyclohexanediyl, phenylene, —CH(OH)—, —C(C2H5)(CH2—CH2—OH)—, —C(CH3)(CH2—CH2—OH)—, —C(CH2—CH2—OH)2—, —N(CH3)—, —N(C2H5)—, —N(CH2—CH2—OH)—, —CO—O—, —O—CO—, —P(CH2—CH2—OH)—, —P(O)(CH2—CH2—OH)—, -0-P(O—CH2—CH2—OH)—O—, -0-P(O)(0-CH2—CH2—OH)—O—, —O-cyclohexanediyl-C(CH3)2-Cyclohexanediyl-O—, —O-phenylene-C(CH3)2-phenylene-O—, —O-phenylene-CH2-phenylene-O—, —Si(CH3)2—, -0-Si(CH3)2—O—, —O—Si(CH3)(0-CH3)—O—, —Si(CH3)(R17)—O—Si(CH3)(R18)—, 5-(2-hydroxyethyl)-[1,3,5]triazinane-2,4,6-trione-1,3-diyl and/or by from one to nine oxygen atoms.

Abstract: Compounds of formula (I), wherein R1 is hydrogen or alkyl; R2 is C1-C4alkoxy or a morpholino radical; and R3 is hydrogen or C1-C4alkoxy, are suitable for improving the solubility of specific photoinitiators in formulations and accordingly enhance the storage stability of formulations comprising a photoinitiator and compounds of formula (I)

Abstract: The invention relates to ?-hydroxy ketones of formula I or IIa; or mixtures of compounds of formula I and II; or mixtures of compounds of formulae Ia and IIa