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13.2 g of y-butyrolactone (GBL) was added to a flask equipped with a thermometer, a reflux tube, a stirrer and a nitrogen inlet tube under a nitrogen atmosphere, and the internal temperature was raised to 85° C. while stirring. 

Separately from the above, 5 .0 g (15 .8 mmol) of monomer (18), 4.6 g (19.5 mmol) of monomer (19), and 1.9 g (8.2 mmol) of monomer (20) were dissolved in 79.6 g ofy-buty› rolactone (GBL). Then, 0.72 g of dimethyl 2,2’-azobis(isobu- tyrate) (product name: V-601, manufactured by Waka Pure Chemical Industries, Ltd.) as a radical polymerization initia› tor was added and dissolved in the obtained solution. 

The mixed solution was added to the flask in a dropwise manner at a constant rate over 4 hours, and then heated while stirring for 1 hour, and the reacting solution was cooled to room temperature. 

The obtained reaction polymer solution was added to an excess amount of a methanol/water mixed solution in a drop› wise manner so as to deposit a polymer. Thereafter, the pre› cipitated white powder was separated by filtration, followed by washing with a methanol/water mixed solution and drying under reduced pressure, thereby obtaining 8.1 g of a poly› meric compound (47) as an objective compound. 

With respect to the polymeric compound, the weight aver› age molecular weight (Mw) and the dispersity (Mw/Mn) were determined by the polystyrene equivalent value as mea› sured by gel permeation chromatography (GPC). As a result, it was found that the weight average molecular weight was 6,900, and the dispersity was 1. 73. 

Further, as a result of an analysis by $^{13}$C-NMR, it was found that the copolymer compositional ratio (ratio (molar ratio) of the respective structural units within the structural formula) was l/m/n=40/40/20. 

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Comparative Polymer Synthesis Example 1 

## Synthesis of Polymeric Compound (47) 

[Chemical Formula 108] 

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Comparative Polymer Synthesis Examples 2 to 9 

## Synthesis of Polymeric Compounds ( 48) to ( 54) 

Polymeric compounds ( 48) to ( 54) were produced in the same manner as in Comparative Polymer Synthesis Example 1, except that the following monomers (18) to (29) which derived the structural units constituting each polymeric com› pound were used with a molar ratio indicated in Table 24. 

The weight average molecular weight (Mw) and the molecular weight distribution (Mw/Mn) of the obtained poly› meric compounds ( 48) to (54) are shown in Table 24. 

[Chemical Formula 109] 

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-continued 

