Onium salts and the use thereof as photoinitiators

Details Onium salts and the use thereof as photoinitiators Onium salts and the use thereof as photoinitiators

C - Chemistry, Metallurgy

07

C

96/152, 260/271,

C07C 323/60 (2006.01) C07C 381/00 (2006.01) C07C 381/12 (2006.01) C07C 391/00 (2006.01) C07D 311/16 (2006.01) C07D 519/00 (2006.01) C07F 9/74 (2006.01) G03F 7/029 (2006.01) G03F 7/039 (2006.01)

Patent

CA 2039703

NOVEL ONIUM SALTS AND THE USE THEREOF AS PHOTOINITIATORS Abstract Sulfonium, selenonium, arsonium, ammonium and phosphonium salts, useful as photoinitiators, comprise: a chromophore which absorbs visible radiation, the chromophore (1) having a removable positive hydrogen ion and (Z) exhibiting a higher energy occupied molecular orbital than at least one other substituent attached to the S, Se, As, N or P atom of the salt; a group which links the chromophore to the S, Se, As, N or P atom of the salt, the group partially preventing a resonance between the chromophore and the other substituents in the salt; at least one substituent comprising an electron withdrawing group and exhibiting a lower unoccupied molecular orbital than the chromophore; and, an anion; the salts being capable, upon exposure to visible radiation, of forming a Bronsted acid.

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