R1 R2 Y/X Stickiness(Evaluation 2) 1 H H ??? ?? 2 CH3 CH3 0.004 ??? 1:2 = 5:95 0.053 ??? 1:2 = 20:80 0.202 ?? [0171] As is clear form the aforementioned Table 3, even if R1 or R2 is a hydrogen atom due to unreacting, when the ratio thereof is small (Y/X=0.053), there is no great influence.