Patent ID: 7622240

Claim:
A resist composition comprising: a substituted oligosaccharide, wherein the substituted oligosaceharide is substituted with at least one acid-cleavable —OR group and the substituted oligosaccharide has 2 to 10 monosaccharides, wherein: each monosaccharide in the substituted oligosaccharide has at least three carbon atoms; the monosaccharides are joined by glycosidic linkages; and at least one remaining hydroxyl group from a monosaccharide of said substituted oligosaccharide has been replaced by a protective group having the acid-cleavable —OR group, wherein said acid-cleavable —OR group is selected from the following structures: wherein R 1 -R 14 , R 16 -R 17 , and R 19 -R 35 are each independently selected from the group consisting of hydrogen, a linear alkyl group having 1-6 carbon atoms, a branched alkyl group having 2-12 carbon atoms, a cycloalkyl group having 3-17 carbon atoms, a fluorinated linear alkyl group having 2-12 carbon atoms, a fluorinated branched alkyl group having 2-12 carbon atoms, and a fluorinated cycloalkyl group having 3-17 carbon atoms, wherein R 15 , R 18 , and R 36 are each independently selected from the group consisting of a linear alkyl group having 1-6 carbon atoms, a branched alkyl group having 2-12 carbon atoms, a cycloalkyl group having 3-17 carbon atoms, a fluorinated linear alkyl group having 2-12 carbon atoms, a fluorinated branched alkyl group having 2-12 carbon atoms, and a fluorinated cycloalkyl group having 3-17 carbon atoms, and wherein any two of R 1 -R 36 that are in the same molecule may be linked to form a three- to eight-membered cyclic group.