181  US 9,323,150 B2  182  -continued  -continued  LCl-4  (Rb2)n2  0  (Rb2)n2  0  LCl-6  (Rb2)n2  0  LCl-7  (Rb2)n2  (Rb2)n2  LCl-8  LCl-9  (Rb2)n2  0  LCl-10  (Rb2)n2  0  LCl-11  (Rb2)n2  0  0)  LCl-12  (Rb2)n2  ~"’’"’  0  0)  LCl-13  0  LCl-14  0  LCl-15  (Rb2)n2  I  LCl-16  The presence of a substituent (Rb$_{2}$) on the portion of the  lactone structure is optional. As a preferred substituent (Rb$_{2}$),  there can be mentioned an alkyl group having 1 to 8 carbon  atoms, a cycloalkyl group having 4 to 7 carbon atoms, an  alkoxy group having 1 to 8 carbon atoms, an alkoxycarbonyl  group having 1 to 8 carbon atoms, acarboxyl group, a halogen  atom, a hydroxyl group, a cyano group, an acid-decompos- able group or the like. Of these, an alkyl group having 1 to 4  carbon atoms, a cyano group and an acid-decomposable  group are more preferred. In the formulae, n$_{2 }$ is an integer of  0 to 4. When n$_{2 }$ is 2 or greater, the plurality of present sub- stituents (Rb$_{2}$ )  may be identical to or different from each  other. Further, the plurality of present substituents (Rb$_{2}$ )  may  be bonded with each other to thereby form a ring.  As the repeating units with a lactone structure represented  by any of the general formulae (LCl-1) to (LCl-16), there can  be mentioned the repeating units represented by the following  general formula (All). 