Preparation of copolymers crosslinkable by a free radical method

US5527859A · kind A · utility

Assignee

• BASF SE

Inventors

• Fritz E. Kempter · Mannheim, DE
• Wolfgang Reich · Frankenthal (Pfalz), DE
• Jurgen Hofmann · Spalt, DE

Key dates

• Filing date: Aug 2, 1995
• Grant date: Jun 18, 1996
• Expiry date: Aug 2, 2015

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F2810/30
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

Copolymers crosslinkable by a free radical method are prepared by polymer-analogous reaction of PA0 A) a copolymer (A) which is composed of PA1 a1) from 20 to 85 mol % of a monomer (a1) having the structural element of methacrylic acid and PA1 a2) from 15 to 80 mol % of another monomer (a2) which undergoes free radical polymerization, PA1 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 PA0 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.degree. to 150.degree. 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.