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The group capable of decomposing by the action of an acid to generate an alcoholic hydroxyl group is preferably repre› sented by at least one formula selected from the group con- sisting of the following formulae (II-1) to (II-4). 

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In the above formulae, each ofR/s independently repre› sents a hydrogen atom or a monovalent organic group. R/s may be bonded to each other to form a ring. 

Each of R$_{4}$ ’s independently represents a monovalent organic group. R$_{4}$ ’s may be bonded to each other to form a ring. R$_{3 }$ and R$_{4 }$ may be bonded to each other to form a ring. 

Each of Rs’ s independently represents a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group, an alkenyl group or an alkyny 1 group. At least two Rs’ s may be bonded to each other to form a ring, provided that when at least one or two of three Rs’s represent a hydrogen atom, at least one of the remaining Rs’ s represents an aryl group, an alkenyl group or an alkynyl group. 

The group capable of decomposing by the action of an acid to generate an alcoholic hydroxyl group is also preferably represented by at least one formula selected from the group consisting of the following formulae (II-5) to (II-9). 

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