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The repeating units of general formula (VI) below are also preferred as the repeating unit (B2). 

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In general formula (VI), each ofR$_{6}$ i, R$_{62 }$and R$_{63 }$indepen› dently represents a hydrogen atom, an alkyl group, a monova› lent aliphatic hydrocarbon ring group, a halogen atom, a cyano group or an alkoxycarbonyl group, provided that R$_{62 }$ may be bonded to Ar$_{6 }$ to thereby form a ring (preferably a 5- or 6-membered ring), which R$_{62 }$in this instance is an alkylene group. 

Ar$_{6 }$ represents an aromatic ring group. 

Y, or each ofY s independently, represents a hydrogen atom or a group that when acted on by an acid, is cleaved, provided that at least one ofY sis a group that when acted on by an acid, is cleaved. 

In the formula, n is an integer of 1 to 4. 

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