Feb.4,2021  118  US 2021/0033971 Al  Mw~ 8,300  Mw/Mn~ 1.73  Comparative Polymer 2  r  0 {)  OH  r  0  0  F2  0  C  Y’s03- 0  CF3  Q  rYS~  VL--1V  Mw~9,800  Mw/Mn~ 1.72  Mw~9,900  Mw/Mn~ 1.99  OH  [0205]  Comparative Polymer 1 was obtained by the same  procedure as in Synthesis Example 1 except that Monomer  1 was omitted. Comparative Polymer 1 was analyzed for  composition by $^{13}$C- and $^{1}$H-NMR and for Mw and Mw/Mn  by GPC.  [0206]  Comparative Polymer 2 was obtained by the same  procedure as in Synthesis Example 2 except that Monomer  2 was omitted and l-methyl-1-cyclopentyl methacrylate was  used instead of l-methyl-1-cyclohexyl methacrylate. Com› parative Polymer 2 was analyzed for composition by  $^{13}$C› and $^{1}$H-NMR and for Mw and Mw/Mn by GPC.  [0203]  Synthesis of Polymer 9  [0204]  A 2-L flask was charged with 0.6 g of Monomer 8,  8.4 g of l-methyl-1-cyclopentyl methacrylate, 3.8 g of  3-hydroxystyrene, 11.0 g of PAG Monomer 2, and 40 g of  THF solvent. The reactor was cooled at - 70°  C. in nitrogen  atmosphere, after which vacuum pumping and nitrogen  blow were repeated three times. The reactor was warmed up  to room temperature, whereupon 1.2 g of AIBN ~as added.  The reactor was heated at 60°  C., whereupon react10n ran for  15 hours. The reaction solution was poured into 1 L ofIPA  for precipitation. The precipitated white solid was collected  by filtration and vacuum dried at 60°  C., yielding Polymer  9. Polymer 9 was analyzed for composition by $^{13}$C- and  $^{1}$H-NMR and for Mw and Mw/Mn by GPC.  Q  rYS~  VL--1V  Mw~9,100  Mw/Mn~ 1.79  Comparative Polymer 1  Synthesis Example 9  Comparative Synthesis Example 2  Comparative Synthesis Example 1  -continued 