In the formula, R is as defined above; each ofY 2 ’  and Y 2 "  independently represents a divalent linking group; X’ repre› sents an acid dissociable group; and w represents an integer of $^{20 }$ 0~3.  ~  [Chemical Formula 52]  Specific examples of structural units represented by gen› eral formula (all-0-15) include structural units represented  by the aforementioned formulas (al-1-4) to (al-1-6) and (al- 1-34) which were described above as specific examples of the  structural unit represented by general formula (al-1).  Examples of structural units represented by general for› mula (all-1-2) include structural units represented by the  aforementioned formulas (al-3) and (al-4), and a structural  unit represented by formula (al-3) is particularly preferable.  As a structural unit represented by general formula (al 1- 1-2), those in which Y 2  is a group represented by the afore› mentioned  formula  - Y$^{21}$---0-Y 22  - or  - Y $^{21}$----C  (=O)-O-Y$^{22}$-is particularly desirable.  Preferable examples of such structural units include a  structural unit represented by general formula (al-3-01)  shown below, a structural unit represented by general formula  (al-3-02) shown below, and a structural unit represented by  general formula (al-3-03) shown below.  US 9,097,971 B2  118  117  n’ represents an integer of 1 to 6, preferably an integer of 0  to 3, more preferably 1 or 2, and most preferably 2.  Specific examples of structural units represented by gen› eral formula ( al-3-01) include structural units represented by  the aforementioned formulas (al-3-25) and (al-3-26).  Specific examples of structural units represented by gen› eral formula (al-3-02) include structural units represented by  the aforementioned formulas (al-3-27) and (al-3-28).  In general formula (al-3-03), as the divalent linking group  for Y 2 ’  and Y 2 ", the same groups as those described above for  Y $^{2 }$in general formula (al-3) can be used.  As Y 2 ’,  a divalent hydrocarbon group which may have a  substituent is preferable, a linear aliphatic hydrocarbon group  is more preferable, and a linear alkylene group is still more  preferable. Among linear alkylene groups, a linear alkylene  group of 1 to 5 carbon atoms is preferable, and a methylene  group or an ethylene group is particularly desirable.  As Y 2 ",  a divalent hydrocarbon group which may have a  substituent is preferable, a linear aliphatic hydrocarbon group  is more preferable, and a linear alkylene group is still more  preferable. Among linear alkylene groups, a linear alkylene  group of 1 to 5 carbon atoms is preferable, and a methylene  group or an ethylene group is particularly desirable.  As the acid dissociable group for X’, the same groups as  those described above can be used.  X’ is preferably a tertiary  alkyl ester-type acid dissociable group, more preferably the  aforementioned group (i) in which a substituent is bonded to  the carbon atom to which an atom adjacent to the acid disso› ciable group is bonded to on the ring skeleton of a monovalent  aliphatic cyclic group to form a tertiary carbon atom. Among  these, a group represented by the aforementioned general  formula (1-1) is particularly desirable.  w represents an integer of Oto 3, preferably an integer of 0  to 2, more preferably 0 or 1, and most preferably 1.  As the structural unit represented by general formula (al- 3-03 ), a structural unit represented by general formula ( a 1-3- 03-1) or (al-3-03-2) shown below is preferable, and a struc› tural unit represented by general formula (al-3-03-1) is  particularly desirable.  In the formulas,  R  is the same as defined above;  R  $^{13 }$rep› resents a hydrogen atom or a methyl group;  R  $^{14 }$represents an  alkyl group; e represents an integer of 1 to 10; and n’ repre› sents an integer of 0 to 6.  [Chemical Formula 53]  [Chemical Formula 54]  In general formulas (al-3-01) and (al-3-02), R$^{13 }$is prefer› ably a hydrogen atom.  R$^{14 }$is the same as defined for R$^{14 }$in the aforementioned  formulas (1-1) to (1-9).  e is preferably an integer of 1 to 8, more preferably 1 to 5,  still more preferably 2 to 5, particularly preferably 1 or 2, and  most preferably 2.  (al-3-03)  k H2  c......_  I  \  ty:2,  0 t TI  X’  0-,A-._O  y  •  y>•,)<’’o’’  (al-3-02)  (al-3-01)  (al-3-03-1) 