Patent ID: 7105272

Claim:
An acid-degradable composition, comprising: a polymer having a repeating unit represented by the following general formula (I): wherein R 1 and R 2 independently represent halogen atom, C 1-20 hydrocarbon group, a heterocyclic group, a cyano group, a nitro group, a C(=O)R 4 group, S(O) n R 4 group, P(=O)(R 4 ) 2 group or M(R 4 ) 3 group; R 3 represents C 1-20 hydrocarbon group or a heterocyclic group; R 4 represents C 1-20 hydrocarbonoxy group, C 1-20 hydrocarbon group, C 1-20 hydrocarbonthio group or mono- or di-C 1-20 hydrocarbonamino group; M represents a silicon, germanium, tin or lead atom; and n is 0, 1 or 2; and an acid or a compound capable of generating an acid in response to an external stimulus.