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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, 3.43 g of the compound (I-A) as a radical polymerization initiator 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. 

## Polymer Synthesis Example 39 

## Synthesis of Polymeric Compound (39) 

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 5.7 g of a poly› meric compound (39) 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 7,500, and the dispersity was 1.71. 

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. 

