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In some aspects, it is preferred for the repeating units of general formula (A2) to be those oft-butyl methacrylate and ethylcyclopentyl methacrylate. 

The monomers corresponding to the repeating units of general formula (A2) can be synthesized by performing an esterification between (meth)acrylic chloride and an alcohol compound in a solvent, such as THF, acetone or methylene chloride, in the presence of a basic catalyst, such as triethy› lamine, pyridine or DBU. Alternatively, commercially avail› able monomers may be used. 

The resin (Ab) may further comprise any of repeating units of general formula (A5) below. 

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In formula (A5), 

X represents a hydrogen atom, an alkyl group, a hydroxyl group, an alkoxy group, a halogen atom, a cyano group, a nitro group, an acyl group, an acyloxy group, a cycloalkyl group, an aryl group, a carboxyl group, an alkyloxycarbonyl group, an alkylcarbonyloxy group or an aralkyl group, being similar to X of general formula (A2b ). 

A$_{4 }$ represents a hydrocarbon group not cleaved under the action of an acid. 

As the hydrocarbon group not cleaved under the action of an acid, represented by A$_{4 }$ in general formula (A5), there can be mentioned any of hydrocarbon groups other than the above acid-decomposable groups, for example, an alkyl group (preferably 1 to 15 carbon atoms) not cleaved under the action of an acid, a cycloalkyl group (preferably 31 to 15 carbon atoms) not cleaved under the action of an acid, an aryl group (preferably 6 to 15 carbon atoms) not cleaved under the action of an acid and the like. 

The hydrocarbon group not cleaved under the action of an acid, represented by A$_{4 }$ may further be substituted with a hydroxyl group, an alkyl group, a cycloalkyl group, an aryl group or the like. 

It is also preferred for the resin (Ab) to further comprise any of repeating units of general formula (A6) below. 

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In general formula (A6), 

R$_{2 }$ represents a hydrogen atom, a methyl group, a cyano group, a halogen atom or a perfluoro group having 1 to 4 carbon atoms. 

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