Copolymers crosslinkable by a free radical method

US5484850A · kind A · utility

Assignee

• BASF SE

Inventors

• Fritz E. Kempter · Mannheim, DE
• Wolfgang Reich · Frankenthal (Pfalz), DE
• Ulrich Jager · Lichtenfels, DE
• Eckhard Korona · Neustadt, DE

Key dates

• Filing date: Oct 28, 1994
• Grant date: Jan 16, 1996
• Expiry date: Oct 28, 2014

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F2810/20
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Copolymers crosslinkable by a free radical method and having a number average molecular weight of from 1500 to 6000 and a molecular weight distribution corresponding to a polydispersity of from 1 to 4.0 are obtainable by polymer-analogous reaction of PA1 A) a copolymer (A) which is composed of PA2 a1) from 50 to 85 mol % of a monomer (a1) containing the structural element of methacrylic acid and PA2 a2) from 15 to 50 mol % of another monomer (a2) undergoing free radical polymerization, PA2 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, and is obtainable by free radical mass or solution polymerization at from 140.degree. to 210.degree. C. and with an average residence time of from 2 to 90 minutes with PA1 B) an olefinically unsaturated monomer (B) which carries a functional group which is complementary to the functional groups of the monomers (a3). Said copolymers are used as binders for powder coatings.