Multifunctional cationic photoinitiators, their preparation...

Details Multifunctional cationic photoinitiators, their preparation... Multifunctional cationic photoinitiators, their preparation...

2007-11-13

2007-11-13

Lambkin, Deborah C. (Department: 1626)

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C524S082000, C522S027000, C252S700000

Reexamination Certificate

active

10538243

ABSTRACT:
Compounds of formula (I): [where: R1is a direct bond, oxygen, a group >CH2, sulphur, a group >C═O, a group-(CH2)2— or a group-N—Ra, where Rais hydrogen or alkyl; R3, R4, R5and R6are hydrogen or substituentsα; R8, R9, R10and R11are hydrogen, hydroxy or alkyl; or R9and R11are joined to form a fused ring system with the benzene rings to which they are attached; R7is a direct bond, oxygen or a —CH2-group; p is 0 or 1 ; substituentsα are: alkyl, alkoxy, alkenyl, halogen, nitrile, hydroxyl, aryl, aralkyl, aryloxy, aralkyloxy, arylalkenyl, cycloalkyl, carboxy, carboxyalkoxy, alkoxycarbonyl, aryloxycarbonyl, alkylcarbonyloxy, alkanesulphonyl, arenesulphonyl, alkanoyl or arylcarbonyl; n is 1 to 12; R12is hydrogen, methyl or ethyl; A is a group —[O(CHR13CHR14)a]y—, —[O(CH2)bCO]y-, or —[O(CH2)bCO](y-1)-[O(CHR13CHR14)a]—, where: one of R13and R14is hydrogen and the other is hydrogen, methyl or ethyl; a is 1 to 2 ; b is 4 to 5 ; Q is a residue of a polyhydroxy compound having from 2 to 6 hydroxy groups; x is a number greater than 1 but no greater than the number of available hydroxyl groups in Q; y is a number from 1 to 10; and X−is an anion]; and esters thereof are useful as cationic photoinitiators, especially for use in surface coating applications, such as printing inks and varnishes, and which are intended to be cured by polymerisation initiated by radiation.

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Crivello J. V. et al, “Synthesis and Photoactivity of Novel 5-Arylthianthrenium Salt Cationic Photoinitiators”, Journal of Applied Polymer Science, New York, NY, US, vol. 40, No. 20, 2002, pp. 3465-3580, XP001159197, pp. 3468-3469, table 1.

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