US 2020/0209747 Al  104  Jul.  2, 2020  -continued  X  0  X  0-b  P AG Monomer 2  P AG Monomer 3  ALG Monomer 1  ALG Monomer 2  ALG Monomer 3  Synthesis Example 2-1  [0195]  Synthesis of Polymer 1  [0196]  A 2-L flask was charged with 3.8 g of Monomer 1,  8.4 g of l-methyl-1-cyclopentyl methacrylate, 4.8 g of  4-hydroxystyrene, and 40 g of tetrahydrofuran (THF) 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 temperature, whereupon 1.2 g of azobisisobutyroni› trile (AIBN) 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 precipitated white solid was collected by filtration and  vacuum dried at 60°  C., yielding Polymer 1. Polymer 1 was  analyzed for composition by $^{13}$C- and $^{1}$H-NMR and for Mw  and Mw/Mn by GPC.  t:  0  0  D  Mw~7,500  Mw/Mn~ 1.61  Polymer 1  OH  Synthesis Example 2-2  [0197]  Synthesis of Polymer 2  [0198]  A 2-L flask was charged with 5.0 g of Monomer 2,  7.3 g of l-methyl-1-cyclohexyl methacrylate, 4.2 g of 4-hy› droxystyrene, 1.0 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 temperature, whereupon 1.2 g of AIBN 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 precipitated white  solid was collected by filtration and vacuum dried at 60°  C.,  yielding Polymer 2. Polymer 2 was analyzed for composi› tion by $^{13}$C- and $^{1}$H-NMR and for Mw and Mw/Mn by GPC. 