Patent ID: 6156477
Filing Date: 2000-12-05
Classification: C08F,G03F,Y10S

Abstract:
A polymer comprising recurring units of formula (1), whereinat least one of the hydrogen atoms of phenolic hydroxyl and/or carboxyl is independently replaced by an acid labile group,the polymer is 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 phenolic hydroxyls and/or carboxyls with an alkenyl ether or halogenated alkyl ether,the amount of the acid labile group and the crosslinking group combined is on the average from more than 0 mol % to 80 mol % of the entirety of the phenolic hydroxyl and carboxyl in formula (I), and the polymer has a weight average molecular weight of 1,000 to 500,000,wherein formula (1) is ##STR49## wherein R.sup.1 is hydrogen or methyl, R.sup.2 is a normal, branched or cyclic alkyl of 1 to 8 carbon atoms, R.sup.3 is hydrogen, R.sup.4 is --COOR.sup.5, R.sup.5 is hydrogen or normal, branched or cyclic alkyl of 1 to 8 carbon atoms, x is 0 or a positive integer, y is a positive integer, the sum of x+y is up to 5, p and q are positive numbers satisfying p+q=1 and 0<q/(p+q).ltoreq.0.9.