Patent ID: 6027854
Filing Date: 2000-02-22
Classification: G03F,Y10S

Abstract:
A polymer comprising recurring units of the following general formula (1), ##STR45## wherein R.sup.1 is hydrogen or methyl, R.sup.2 is a normal, branched or cyclic alkyl group of 1 to 8 carbon atoms, R.sup.3 is a divalent hydrocarbon group of 1 to 18 carbon atoms which may have a hetero atom, each of R.sup.4 and R.sup.5 is hydrogen or a monovalent hydrocarbon group of 1 to 18 carbon atoms which may have a hetero atom, letter x is 0 or a positive integer, y is a positive integer, the sum of x+y is up to 5, each of x' and z' is 0 or a positive integer, y' is a positive integer, the sum of x'+y'+z' is up to 5, each of p and q is 0 or a positive number, r is a positive number, p and q are not equal to 0 at the same time, satisfying 0.ltoreq.p.ltoreq.0.4, 0.ltoreq.q.ltoreq.0.4, 0.01.ltoreq.p+q.ltoreq.0.8, and p+q+r=1,the hydrogen atoms of some of phenolic hydroxyl groups and/or alcoholic hydroxyl groups and/or carboxyl groups being replaced by acid labile groups,the polymer being crosslinked within a molecule and/or between molecules with a crosslinking group having a C--O--C linkage resulting from reaction of some of the remaining alcoholic hydroxyl groups and/or carboxyl groups with an alkenyl ether compound or halogenated alkyl ether compound,the amount of the acid labile group and the crosslinking group combined being on the average from more that 0 mol % to 80 mol % of the entirety of the phenolic hydroxyl group, alcoholic hydroxyl group and carboxyl group in formula (1),the polymer having a weight average molecular weight of 1,000 to 500,000.