50  US 7,851,130 B2  49  -continued  As the skeleton of the alicyclic hydrocarbon to be formed,  the same cycloalkyl groups as represented by R$_{12 }$to R$_{25 }$ in  formulae (pl) to (pVI) are exemplified.  The skeleton of the alicyclic hydrocarbon structure may  have a substituent, and as the substituents, the groups repre› sented by R$_{13}$’ to R 16 ’ in formula (II-AB!) or (II-AB2) can be  exemplified.  In the alicyclic hydrocarbon-based acid-decomposable  resin in the invention, a group capable of decomposing by the  action of an acid can be contained in at least one repeating unit  of a repeating unit having a partial structure containing ali› cyclic hydrocarbon represented by any of formulae (pl) to  (pV), a repeating unit represented by formula (II-AB), and a  repeating unit of the later-described copolymer component.  Various substituents ofR$_{13}$ ’ to R 16 ’ in formula (II-AB!) or  (II-AB2) can also be used as the substituents of the atomic  group to form an alicyclic hydrocarbon structure in formula  (II-AB), or atomic group Z to form a bridged alicyclic hydro› carbon structure.  The specific examples of the repeating units represented by  formula (II-AB!) or(II-AB2) are shown below, but the inven› tion is not restricted thereto.  In each of the above structural formulae, Rx represents H,  CH$_{3}$ ,  CF$_{3 }$ or CH$_{2}$OH; and Rxa and Rxb each represents an  alkyl group having from 1 to 4 carbon atoms.  As the halogen atoms represented by R$_{11}$ ’ and R 12 ’ in  formula (II-AB), a chlorine atom, a bromine atom, a fluorine  atom and an iodine atom are exemplified.  As the alkyl groups represented by R$_{11}$’ and R 12 ’, straight  chain or branched alkyl groups having from 1 to 10 carbon  atoms are preferred, e.g., a methyl group, an ethyl group, an  n-propyl group, an isopropyl group, a straight chain or  branched butyl group, pentyl group, hexyl group, heptyl  group, etc., are exemplified.  The atomic group represented by Z’ to form an alicyclic  structure is an atomic group to form a repeating unit having an  alicyclic hydrocarbon structure in the resin, which may have  a substituent, and an atomic group to form a repeating unit  having a bridged alicyclic hydrocarbon structure is especially  preferred.  15  Rx  I  -----t  CH2 - C-r- 16  I  O=C  Rxa  I  0  17  18 19  [11-7]  [11-6]  [11-5]  [11-4]  [11-3]  [11-2]  [11-1] 