Process for the production of a single-component powder resin for use in electrostatic powder spray coating processes

摘要

This invention describes a process for the production of a single-component resin powder useful in electrostatic spray coating processes by the formation of partially esterified and alkoxylated copolymers obtained through the reaction of vinyl-aromatic hydrocarbons with alpha, beta-unsaturated dicarboxylic acid anhydrides which are subsequently half-esterified and thereafter the resultant carboxyl group of which is alkoxylated with C2 to C4 alkene oxides. Said copolymer is reacted with a monoblocked diisocyanate between 110 DEG and 130 DEG C in the melt form until said single-component resin powder is formed.