Patent ID: 7563558

Claim:
A polymer useful in negative resist compositions, comprising: a first monomer having a polar functional group, wherein the polar functional group comprises a tertiary alcohol and wherein the first monomer provides an acid catalyzed polarity switch upon elimination of the polar functional group, and further wherein the first monomer has the structure of formula (I): wherein: R 1 is a polymerizable group selected from the group consisting of acrylate, methacrylate, cyclic olefin, and vinyl moieties; R 2 and R 3 are each alkyl, or alkyl substituted with a group selected from hydroxyl, alkoxy, acyl, arylcarbonyl, acyloxy, alkoxycarbonyl, aryloxycarbonyl, silyl, alkyl, aryl, aralkyl, and alkaryl, provided that R 3 is an alkyl with at least one hydrogen at the C1 position, and provided that R 2 and R 3 may be taken together to form an alicyclic moiety; and R 4 is —OH; and a second monomer having a fluoroalcohol moiety, wherein the second monomer provides aqueous dissolution.