Patent ID: 7393624

Claim:
A negative resist composition, comprising: a first monomer having a polar functional group that is attached as a tertiary ether linkage, a tertiary ester linkage, or an acetal linkage, wherein the first monomer provides an acid catalyzed polarity switch upon elimination of the polar functional group, and a second monomer having a fluoroalcohol moiety, wherein the second monomer provides aqueous dissolution, 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 is an alkyl, or a substituted alkyl; R 3 is an alkyl with at least one hydrogen at the C1 position, or is taken together with R 2 to form an alicyclic moiety; and R 4 is —OXR 5 or wherein X is a straight or branched alkyl group and R 5 is selected from the group consisting of carboxylic acids and fluoroalcohol moieties.