Preparation of copolymers crosslinkable by a free radical method

摘要

Copolymers crosslinkable by a free radical method are prepared by polymer-analogous reaction of A) a copolymer (A) which is composed of a1) from 20 to 85 mol % of a monomer (a1) having the structural element of methacrylic acid and a2) from 15 to 80 mol % of another monomer (a2) which undergoes free radical polymerization, a3) from 5 to 50 mol % of the total amount of the monomers (a1) and (a2) being monomers (a3) which carry functional groups and whose functional groups are capable of undergoing a condensation or addition reaction, with B) an olefinically unsaturated monomer (B) which carries a functional group which is complementary to that of the monomers (a3), by a process in which the polymer-analogous reaction is carried out at from 90 DEG to 150 DEG C. in an average residence time of from 3 to 20 minutes in highly concentrated solution or in the absence of a solvent. Said copolymers are used as binders for powder coatings.