Patent ID: 6605416
Filing Date: 2003-08-12
Classification: C09B,G03F,Y10S

Abstract:
A process for generating acid, which process comprises:(a) providing a mixture of a photochemical acid progenitor and a squarylium dye having a nucleus of the general formula: wherein:R1 to R4 are independently selected from hydrogen, alkyl, cycloalkyl, aralkyl, carboalkoxyalkyl and carboaryloxyalkyl groups; X represents >CR5R6, >POR7, or >BOR7 wherein;R5 and R6 are independently selected from hydrogen, alkyl, cycloalkyl, aryl, and aralkyl groups; or R1 and R5, and/or R2 and R6, and/or R3 and R5, and/or R4 and R6, and/or R5 and R6 represent the necessary atoms to complete a 5-, 6- or 7-membered ring; andR7 represents an alkyl group; and (b) irradiating said mixture with radiation from a light source.