Patent ID: 6994946

Claim:
A silicon-containing polymer comprising recurring units of the general formula (1) and units which improve alkali solubility under the action of an acid, wherein R 1 is hydrogen or a straight, branched or cyclic C 1 -C 10 alkyl group, R 2 is a single bond or a divalent linking group of the general formula (2): R 3 to R 9 are each independently hydrogen or a straight, branched or cyclic C 1 -C 12 alkyl or fluoroalkyl group which may contain an ether, lactone, ester, hydroxy or cyano group, R 10 and R 11 are each independently a straight, branched or cyclic C 1 -C 10 alkyl group, R 12 is a single bond, oxygen atom or C 1 -C 4 alkylene group, a is a positive number, and b is an integer of 1 to 20.