Patent ID: 7718342

Claim:
A polymer comprising recurring units having the general formulas (1), (2), (3), (4), (5), and (6), shown below, in amounts of 1 to 60 mol % of units (1), 1 to 60 mol % of units (2), 1 to 50 mol % of units (3), 0 to 60 mol % of units (4), 0 to 30 mol % of units (5), and 3 to 30 mol % of units (6), said polymer having a weight average molecular weight of 3,000 to 30,000 and a dispersity of 1.5 to 2.5, wherein R 1 , R 3 , R 4 , R 7 , R 9 , and R 11 are each independently hydrogen or methyl, Y is methylene or an oxygen atom, R 2 is CO 2 R 10 when Y is methylene and R 2 is hydrogen or CO 2 R 10 when Y is an oxygen atom, R 10 is a straight, branched or cyclic alkyl group of 1 to 15 carbon atoms or a similar alkyl group in which at least one oxygen atom intervenes in an arbitrary carbon-to-carbon bond thereof, R 5 and R 6 are each independently hydrogen or a hydroxyl group, R 8 is a tertiary ester type acid-labile protective group selected from the general formulas (R 8 -1) and (R 8 -2), shown below, wherein R 13 , R 14 , and R 15 are each independently a straight, branched or cyclic alkyl group of 1 to 15 carbon atoms, R 16 is a straight or branched alkyl group of 1 to 15 carbon atoms, and Z is an atomic grouping which forms cyclopentane, cyclohexane, adamantane, norbornane, tricyclo[5.2.1.0 2,6 ]decane or tetracyclo[4.4.0.1 2,5 .1 7,10 ]dodecane or a derivative thereof with the carbon atom to which it is bonded, and R 12 is a fluoroalkyl group containing a hydroxyl group selected from the group consisting of groups having the following formulae: