Patent ID: 7179579

Claim:
A radiation-sensitive composition comprising: (A) a compound capable of generating an acid upon irradiation with one of actinic rays and radiation, and (B) a resin containing a repeating unit having a group represented by at least any one of the following formulae (I-1) to (I-4) and a repeating unit having a group represented by the following formula (XA), which increases the solubility in an alkali developing solution by the action of an acid: wherein R 1 to R 5 each independently represents a hydrogen atom, an unsubstituted or substituted alkyl group, an unsubstituted or substituted cycloalkyl group or an unsubstituted or substituted alkenyl group, two of R 1 to R 5 may be bonded each other to form a ring: wherein R 1b and R 2b , which may be the same or different, each represents a hydrogen atom or an alkyl group containing 1 to 4 carbon atoms, R 3b and R 4b , which may be the same or different, each represents a hydrogen atom, or an unsubstituted or substituted, straight-chain, branched or cyclic alkyl group, R 5b represents an unsubstituted or substituted, straight-chain, branched or cyclic alkyl group, an unsubstituted or substituted aryl group, or an unsubstituted or substituted aralkyl group, m represents an integer of 1 to 20, and n represents an integer of 0 to 5.