Patent ID: 6777459
Filing Date: 2004-08-17
Classification: B33Y,C08F,C09D

Abstract:
A composition which undergoes minimal yellowing upon curing with ultraviolet radiation or daylight or with light sources equivalent to daylight comprisingat least one ethylenically unsaturated polymerizable compound, (a) at least one acylphosphine oxide photoinitiator of formula (I) in which R1 and R2 independently of one another are C1-C12 alkyl, benzyl, phenyl which is unsubstituted or substituted from one to four times by halogen, C1-C8 alkyl and/or C1-C8 alkoxy, or are cyclohexyl or a group COR3; or R1 is â€”OR4, or a group R3 is phenyl which is unsubstituted or substituted from one to four times by C1-C8 alkyl, C1-C8 alkoxy, C1-C8 alkylthio and/or halogen, or is a group R4 is C1-C8 alkyl, phenyl or benzyl; Y is phenylene, C1-C12 alkylene or cyclohexylene; and X is C1-C18 alkylene or a group (b) one or more lightfast red, blue or violet organic pigments wherein the weight ratio of component (b) to component (a) is from about 10 parts per million to about 10,000 parts per million, and wherein a dispersion of the pigment or pigments of component (b) in a liquid has a positive a value and a negative b value on the L, a, b tri-stimulus color scale, with the proviso that when one of R1 or R2 is C1-C12 alkyl and the other is COR3, that R3 is not phenyl substituted one to four times by C1-C8 alkoxy.