Patent ID: 6319653
Filing Date: 2001-11-20
Classification: C08G,C08L,G03F,Y10S

Abstract:
A negative-acting photoimageable composition developable in alkaline aqueous solution, said composition comprising:I) a binder polymer having an acid number of between about 150 and about 300; a weight average molecular weight between about 5000 and about 60,000, and said polymer being free of styrene or styrene homologues;II) a photopolymerizable material for said binder polymer; and,III) a photoinitiator chemical system,wherein all or a portion of said photopolymerizable material comprises a (meth)acrylate functional urethane oligomer, wherein the (meth)acrylate functionality is separated from the urethane linkage by two or more alkylene oxide groups and one or more ring-opened lactone groups.