Dec. 27, 2018  93  US 2018/0373148 Al  Synthesis Example 2-8  Comparative Synthesis Example 2-2  Comparative Synthesis Example 2-1  Comparative Synthesis Example 2-3  [0181]  Comparative Polymer 3 was synthesized by the  same procedure as in Synthesis Example 2-7 aside from  using 4-hydroxyphenyl methacrylate instead of Monomer 3.  The polymer was analyzed for composition by $^{13}$C- and  $^{1}$H-NMR and for Mw and Mw/Mn by GPC.  [0180]  Synthesis of Comparative Polymer 3  [0176]  Synthesis of Comparative Polymer 1  [0177]  Comparative Polymer 1 was synthesized by the  same procedure as in Synthesis Example 2-1 aside from  omitting Monomer 1. The polymer was analyzed for com› position by $^{13}$C- and $^{1}$H-NMR and for Mw and Mw/Mn by  GPC.  [0178]  Synthesis of Comparative Polymer 2  [0179]  Comparative Polymer 2 was synthesized by the  same procedure as in Synthesis Example 2-3 aside from  using 4-hydroxyphenyl methacrylate instead of Monomer 3.  The polymer was analyzed for composition by $^{13}$C- and  $^{1}$H-NMR and for Mw and Mw/Mn by GPC.  [0175]  A 2-L flask was charged with 5.0 g of Monomer 6,  3.0 g of a-methylene-y-butyrolactone, 12.4 g of Monomer 3,  7.6 g of PAG Monomer 2, and 40 g ofTHF as 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 tempera› ture, whereupon 1.2 g of AIBN as polymerization initiator  was added. The reactor was heated at 60° C., whereupon  reaction ran for 15 hours. The reaction solution was poured  into 1 L of isopropyl alcohol for precipitation. The resulting  white solid was collected by filtration and vacuum dried at  60°  C., yielding Polymer 8 as white solid. The polymer was  analyzed for composition by $^{13}$C- and $^{1 }$H-NMR and for Mw  and Mw/Mn by GPC, with the results shown below.  [0174]  Synthesis of Polymer 8  0  0  ~  Comparative Polymer 1  OH  Polymer 8  Comparative Polymer 2  r 0  0  0  0  0  0  r~  ¢  O  OH  Mw~9,300  Mw/Mn~ 1.89  Mw~9,100  Mw/Mn~ 1.65 