反应详情

A three-necked flask was charged with 250 g of styrene, 250 g of vinyl toluene and 500 g of toluene, and with stirring, a boron trifluoride-phenol complex [boron trifluoride (30%)-phenol (70%); 2% by weight based on total reactants] was added little by little. The reaction was performed for 3 hours at 20° C while cooling the flask with a dry ice-acetone bath. The catalyst was removed with an alkali, and the reaction mixture was concentrated in order to drive off solvent and unreacted monomers. There was obtained a styrene/vinyl toluene copolymer having a softening point of 102° C, a color of not more than 1, an average molecular weight of 1,400 and an acid value of 0.01.

1. temperaturewhile cooling the flask with a dry ice-acetone bath
2. customThe catalyst was removed with an alkali, and the reaction mixture
3. concentrationwas concentrated in order