-continued  84  US 9,170,489 B2  83  (11-5)  (11-6)  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).  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.  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.  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.  (11-4)  (11-3)  (11-2)  (11-1)  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).  -continued  OP  Ra  Ra  PO  OP PO  Ra  Ra  -~  OP  Ra  Ra  *  0  I  0-P  OP  PO  OP  OP  OP  Ra  Ra  OP  OP  ~- OP  OP 