Water soluble thioxanthone photoinitiators

Details Water soluble thioxanthone photoinitiators Water soluble thioxanthone photoinitiators

C - Chemistry, Metallurgy

07

D

402/391, 260/328

C07D 335/16 (2006.01) C08F 2/50 (2006.01) G03F 7/031 (2006.01)

Patent

CA 1188701

ABSTRACT The invention provides novel thioxanthone photinitiators having the formula: Image wherein R1 is alkyl, alkoxy, alkylthio, halogeno, nitro, amino, alkyl-amino, di-alkyl amino, hydroxy alkyl-amino, alkanoylamino, benzoylamino, N-alkanoyl-N-benzoyl-amino, or acetyl, R2 is alkylene, A is -COOH, -SO3H, -OSO3H, or O-CO-X-COOH (where X is such that HO-CO-X-COOH is a di- or tri-carboxylic acid of up to 8 carbon atoms), n is 0, 1, or 2 and m is 1 or 2, provided that when A is -COOH, m is 2, the aforesaid alkyl, alkoxy, alkanoyl, and alkylene residues containing up to 4 carbon atoms each, as the free acid or as a salt thereof, The photoinitiators may advantageously be used in water-based photopolymerizable compositions, e.g. for use in screen stencil production.

410326

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