US 9,097,971 B2  266  265  TABLE 21-continued  TABLE22  POLYMERIC COMPOUND  21  22  23  24  25  26  27  28  29  30  (4)  45  45  24  44  (5)  (6)  16  36  35  35  35  35  (7)  45  (8)  45  (9)  45  (10)  45  (11)  (12)  (13)  (14)  (15)  35  (16)  35  (17)  13  POLYMERIZATION  I-A  I-A  I-A  V601  ACVA  V601  V601  V601  V601  V601  INITIATOR  Mw  7900  6900  7100  10200  10100  7600  7600  7600  7600  7600  Mw/Mn  1.89  1.61  1.94  1.71  1.69  1.80  1.80  1.80  1.80  1.80  POLYMERIC COMPOUND  31  32  33  34  35  36  37  38  MONOMER  (1)  45  33  (2)  (3)  20  20  20  20  20  20  20  12  (4)  45  45  45  45  25  (5)  (6)  35  35  35  17  (7)  (8)  (9)  (10)  (11)  45  (12)  45  (13)  35  (14)  35  (15)  35  (16)  35  (17)  13  POLYMERIZATION  V601  V601  V601  V601  V601  V601  V601  V601  INITIATOR  Mw  7500  7200  7600  7600  7500  7500  8100  7000  Mw/Mn  1.75  1.74  1.80  1.85  1.77  1.83  1.89  1.77  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.  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.  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.  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.  Synthesis of Polymeric Compound (39)  Polymer Synthesis Example 39 