Patent ID: 6762323
Filing Date: 2004-07-13
Classification: C07C,C08F,G03F

Abstract:
A method for making an ink having substantially no mutagenic leachates, comprising exposing a composition comprising pigment and a photopolymerizable compound having at least one ethylenically unsaturated double bond to radiation in the presence of a substantially non-mutagenic photoinitiator having photoinitiation activity similar to that exhibited by 4,4â€²-bis(dimethylamino)benzophenone under similar conditions, said photoinitiator having the formula each A is independently selected from the group consisting of hydrogen, lower alkyl, cycloalkyl, aryl, lower alkanol, lower alkoxy, halogen, sulfonyl, alkylsulfonyl, trihaloalkyl, trihaloalkoxy, trihaloalkylthio, polymerizable moiety â€”(CH2)nâ€”OC(O)â€”CRâ€²H&boxH;CH2 wherein nâ€² is an integer from 1 to 10 and Râ€² is H or lower alkyl, polymerizable maleimide moiety, and oligomeric moiety, with the proviso that no more than three A are the same lower alkyl; each R is independently selected from the group consisting of hydrogen, lower alkyl, cycloalkyl, aryl, lower alkanol, lower alkoxy, halogen, sulfonyl, alkylsulfonyl, trihaloalkyl, trihaloalkoxy, trihaloalkylthio, polymerizable moiety, and oligomeric moiety; and n is an integer from 1 to 4.