Patent ID: 6312869
Filing Date: 2001-11-06
Classification: C08F,G03F,Y10S

Abstract:
A polymer having at least one acid labile group and crosslinked within a molecule and/or between molecules with a crosslinking group having a C--O--C linkage, the polymer having a weight average molecular weight of 1,000 to 500,000,said polymer having recurring units of the following general formula (3),said crosslinking being through a mechanism by which hydrogen atoms are eliminated from phenolic hydroxyl groups represented by R to leave oxygen atoms which are connected by a crosslinking group having a C--O--C linkage of the following general formula (4a) or (4b), the amount of said acid labile group and said crosslinking group combined is on the average more than 0 mol % to 80 mol % of the entire hydrogen atoms of phenolic hydroxyl groups in formula (3), ##STR89##wherein R is a hydroxyl group or OR.sup.3 group, at least one of R groups is a hydroxyl group, R.sup.1 is a hydrogen atom or methyl group, R.sup.2 is a normal, branched or cyclic alkyl group having 1 to 8 carbon atoms, R.sup.3 is an acid labile group, R.sup.4 and R.sup.5 each are a hydrogen atom or normal, branched or cyclic alkyl group having 1 to 8 carbon atoms, R.sup.6 is a monovalent hydrocarbon group of 1 to 18 carbon atoms which may have a hetero atom, or R.sup.4 and R.sup.5, R.sup.4 and R.sup.6, and/or R.sup.5 and R.sup.6, taken together, may form a ring, with the proviso that R.sup.4, R.sup.5 and R.sup.6 each are a normal or branched alkylene having 1 to 8 carbon atoms when they form a ring, R.sup.7 is a tertiary alkyl group having 4 to 12 carbon atoms, letters p1 and p2 each are a positive number, q1 is a positive number, q2 is 0 or a positive number, satisfying 0<p1/(p1+q1+p2).ltoreq.0.8, 0<q1/(p1+q1+q2+p2).ltoreq.0.8, 0.ltoreq.q2/(p1+q1+q2+p2).ltoreq.0.8, and p1+q1+q2+p2=1, a is 0 or a positive integer of 1 to 6, letter x is 0 or a positive integer and y is a positive integer satisfying x+y.ltoreq.5, letter k is 0 or a positive integer, m is 0 or a positive integer, and n is 0 or a positive integer satisfying k+m+n.ltoreq.5, ##STR90##wherein R.sup.8 and R.sup.9 each are a hydrogen atom or normal, branched or cyclic alkyl group having 1 to 8 carbon atoms, or R.sup.8 and R.sup.9, taken together, may form a ring, with the proviso that R.sup.8 and R.sup.9 each are a normal or branched alkylene group having 1 to 8 carbon atoms when they form a ring, R.sup.13 is a normal or branched alkylene group having 1 to 10 carbon atoms, A is a c-valent aliphatic saturated hydrocarbon, alicyclic saturated hydrocarbon, aromatic hydrocarbon or heterocyclic group having 1 to 50 carbon atoms, which may have an intervening hetero atom and in which some of the hydrogen atoms attached to carbon atoms may be replaced by hydroxyl groups, carboxyl groups, carbonyl groups or fluorine atoms, B is --CO--O--, --NHCO--O-- or --NHCONH--, letter c is an integer of 2 to 8, c' is an integer of 1 to 7, and d is 0 or an integer of 1 to 10, R.sup.4 being different from R.sup.8 and R.sup.9, and R.sup.5 being identical with or different from R.sup.8 and R.sup.9.