Patent ID: 6184305
Filing Date: 2001-02-06
Classification: C08F,C09D,G03F

Abstract:
A radiation absorbing polymer which absorbs radiation with wavelength in the range of 180 nm to 450 nm, comprising at least a recurring unit as represented by formula 1 and a recurring unit as represented by formula 2; ##STR19##whereinR.sup.1 and R.sup.2 represent independently a hydrogen atom, or an alkyl group;X is absent, or represents a methylene group, a linear alkyl group of at least 2 carbon atoms, or branched or cyclic alkylene group with at least 3 carbon atoms,Ar is an organic chromophore that absorbs radiation with wavelength in the range of 180 nm to 450 nm and represents a substituted or non-substituted benzene ring, a heterocyclic ring or a condensed ring which is bonded to X directly or through an oxygen atom or a sulfur atom;and n is 0 or an integer of 1, ##STR20##whereinR.sup.3 and R.sup.4 represent independently a hydrogen atom, an alkyl group, or a carboxyl group; and Y represents a hydrogen atom, a substituted or non-substituted alkoxyl group, a substituted or non-substituted alkyl group, a substituted carbonyl group, a substituted or non-substituted oxycarbonyl group or a substituted or non-substituted phenyl group; wherein said polymer is obtained by reacting the copolymer comprising at least a recurring unit as represented in formula 3 or 3' and a recurring unit as represented by formula 2, with a compound as represented by formula 4 which absorbs a radiation with wavelength in the range of 180 nm 450 nm; ##STR21##whereinR.sup.1 and R.sup.2 are as defined above; ##STR22##whereinR.sup.3 and R.sup.4 and Y are defined above;Ar--X--OH (4)whereinX and Ar are as defined above.