Patent ID: 8460850

Claim:
An actinic ray-sensitive or radiation-sensitive resin composition comprising: (A) a resin having at least two of repeating units represented by general formula (1) below and exhibiting increased solubility in an alkali developer when acted on by an acid; and (B) a compound that generates an acid when exposed to actinic rays or radiation; wherein: R represents a hydrogen atom or an optionally substituted alkyl group; A represents: R 0 , each independently in the presence of two or more groups, represents an optionally substituted alkylene group, an optionally substituted cycloalkylene group or a combination thereof, with the proviso that an alkylene group having two or more carbon atoms is excluded when L represents a butyrolactone; Z, each independently in the presence of two or more groups, represents an ether bond, an ester bond, an amido bond, a urethane bond or a urea bond; L represents a substituent with a lactone structure; n represents the number of repetitions and is an integer of 1 to 5; each of the at least two of the repeating units represented by the general formula (1) has different rates of alkali hydrolysis; and the resin (A) has at least one of repeating units represented by general formula (1-1) below as the repeating unit represented by the general formula (1); wherein: R, A, R 0 , Z and n are as defined above with respect to the general formula (1); R 1 , each independently in the presence of two or more groups, represents an optionally substituted alkyl group, an optionally substituted cycloalkyl group, an optionally substituted ester group, a cyano group, a hydroxy group or an alkoxy group, and provided that two or more R 1 s are present, two thereof may be bonded to each other to form a ring; X represents an alkylene group, an oxygen atom or a sulfur atom; and m represents the number of substituents and is an integer of 0 to 5.