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Synthesis of Polymer Compound (Polymer) 

Polymers 1 to 6 were synthesized by using Monomers 1 to 6 obtained in Synthesis Examples 1-1 to 1-6. The struc- tures of PAG monomers 1 and 2 used in Synthesis Example 2 and Comparative Synthesis Example are as follows. 

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A 2 L flask was charged with 9.3 g of Monomer 1, 3.5 g of methacrylic acid 3-hydroxy-1-adamantyl ester, 10.2 g of methacrylic acid 2-oxooxolan-3-yl ester, and 40 g of tetra› hydrofuran as a solvent. This reaction vessel was cooled to - 70° C. in a nitrogen atmosphere, then degassed under reduced pressure and blown with nitrogen three times. After heating to room temperature, 1.2 g of azobisisobutyronitrile (AIBN) was added thereto as a polymerization initiator. The temperature was then increased to 60° C., and the solution reacted for 15 hours. The reaction solution was precipitated in 1 L of isopropyl alcohol, filtered, and dried at 60° C. to obtain a white polymer. 

The obtained polymer was analyzed by $^{13}$C-NMR, $^{1}$H-NMR, and GPC, consequently finding the following results. 

Copolymerization Composition Ratio (Mole Ratio) 

Monomer 1: methacrylic acid 3-hydroxy-1-adamantyl ester: methacrylic acid 2-oxooxolan-3-yl ester=0.25:0.15:0.60 

Weight average molecular weight (Mw)=9,800 

Molecular weight distribution (Mw/Mn)=l.62 

This polymer compound was named Polymer 1. 

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