US 9,513,547 B2  19  ~  -continued  20  -continued  OY  oJ  O:OCCX>  C)-Oq)<()>  p:>aJCO  c09CCY  C>a:J  OOOOQ<J  en woo  cm  CD>' [Jg 6)  QOJQ)Q]  6X>CQC9  Y is preferably an adamantyl group, a noradamantyl  group, a decahydronaphthyl group, a tricyclodecanyl group,  a tetracyclododecanyl group, a norbomyl group, a cyclo› pentyl group, a cyclohexyl group, a cycloheptyl group, a  cyclooctyl group, a cyclodecanyl group, or a cyclododecanyl  group, more preferably an adamantyl group, a norbomyl  group, a cyclohexyl group, a cyclopentyl group, a tetracy› clododecanyl group, or a tricyclodecanyl group, and even  more preferably a cyclohexyl group, a tricyclodecanyl  group, a norbornyl group or an adamantyl group.  In a case where Y is an aromatic group, examples of the  aromatic group ofY preferably include an aryl group having  6 to 18 carbon atoms such as a phenyl group, a tolyl group,  a naphthyl group, or an anthracenyl group, or, for example,  an aromatic ring group which includes a hetero ring such as  thiophene, furan, pyrrole, benzothiophene, benzofuran, ben› zopyrrole, triazine, imidazole, benzimidazole, triazole, thia› diazole, or thiazole. The aromatic group of Y may have a  substituent, and the substituents which may belong to the  aromatic group ofY are the same as the substituents which  may belong to the alicyclic group of Y as described above.  The aromatic group ofY is preferably a phenyl group or  a naphthyl group.  Y is preferably an adamantyl group, a norbornyl group, a  cyclohexyl group, a cyclopentyl group, a tetracyclododeca› nyl group, a phenyl group, a naphthyl group, or a tricyclo› decanyl group, more preferably a cyclohexyl group, a nor› bornyl group, a phenyl group, or a naphthyl group.  The repeating unit which is represented by the general  formula  (1)  is preferably a repeating unit which is repre› sented by the following general formula  (1-1). 