Improvements in or relating to the manufacture of interpolymers of styrene with polyhydric alcoholic mixed esters and of coating compositions obtained therefrom

摘要

The process of the parent Specification is modified by adding a portion only of the styrene to the partially polymerized ester at the beginning of the reaction and thereafter adding the remainder in portions over predetermined intervals of time during the source of the reaction. Suitably, 25 per cent is added at the start and the remainder added in portions of 25 per cent. If desired, the first portion may be added drop by drop. Heating is continued after the last addition of styrene until the desired viscosity is reached.