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same as or different from every other substituent (Rb$_{2}$ ) and also, the plurality of substituents (Rb$_{2}$ ) may combine with each other to form a ring. 

The repeating unit having a lactone group usually has an optical isomer, but any optical isomer may be used. One optical isomer may be used alone or a mixture of a plurality of optical isomers may be used. In the case of mainly using one optical isomer, the optical purity ( ee) thereof is preferably 90% or more, more preferably 95% or more. 

Specific examples of the repeating unit (D) in the resin (P) are set forth below, but the present invention is not limited thereto. In the formulae, Rx represents H, CH$_{3}$ , CH$_{2}$0H or CF$_{3}$ • 

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