2-hydroxy-3-thioxathonyloxy-1-propanaminium salts
AssigneeWard Blenkinsop and Company Limited
InventorsGeorge Gawne, Peter N. Green, William A. Green
Life of this patent
Estimating the term…
Abstract
The invention provides thioxanthone derivatives of general formula ##STR1## wherein one of R.sup.2, R.sup.3 and R.sup.4 is a group of formula ##STR2## in which one of R.sup.5, R.sup.6 and R.sup.7 is an alkyl or a benzyl group, the others being alkyl groups and A.sup.- represents an anion, and R.sup.1 and the others of R.sup.2, R.sup.3, and R.sup.4 are independently selected from hydrogen atoms, alkyl groups and alkoxy groups; and the use of such derivatives as photoinitiators, particularly in aqueous photopolymerizable compositions for the production of stencils for screen printing.
Claims5
A thioxanthone derivative of general formula ##STR7## wherein one of R.sup.2, R.sup.3 and R.sup.4 is a group of formula ##STR8## in which one of R.sup.5, R.sup.6 and R.sup.7 is a C.sub.1-20 alkyl or a benzyl group, the others being C.sub.1-6 alkyl groups and A.sup.- represents an anion, and R.sup.1 and the others of R.sup.2, R.sup.3, and R.sup.4 are independently selected from hydrogen atoms, C.sub.1-6 alkyl groups and C.sub.1-6 alkoxy groups.
Dependencies are inferred from the claim text.