solvents is also advantageous in that it allows the separation of water from solvent in a Barrett or Dean-Stark distillation trap to be sharp and allowing nearly all the solvent to be returned to the reaction vessel However, depending on the solubility of the benzoxazine macromonomer it can also be preferred to use only toluene as a solvent [0068 ] Other solvents such as xylene, cyclohexane and c