Process for the production of bead polymers

US4223114A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Carlhans Suling · Odenthal, DE
• Gerhard Balle · Cologne, DE
• Michael Walkowiak · Leverkusen, DE
• Hans-Hermann Schulz · Leichlingen, DE

Key dates

• Filing date: Apr 25, 1978
• Grant date: Sep 16, 1980
• Expiry date: Apr 25, 1998

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S525/92
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A two-phase bead polymer having an average bead diameter of from 10.mu. to 150.mu. comprising PA1 (A) 88% to 99.5% by weight of a polymer of polymerized units of at least one methacrylic acid ester containing from 1 to 10 carbon atoms in the aliphatic, saturated alcohol component; and PA1 (B) 0.5% to 12% by weight of a polyurethane which has been obtained from (1) at least one dihydroxy compound, (2) a diisocyanate from the group comprising (a) aliphatic diisocyanates having a branched carbon skeleton of 7 to 26 carbon atoms, (b) cycloaliphatic diisocyanates and (c) aliphatic or cycloaliphatic diisocyanates modified by radical graft copolymerization with vinyl monomers, (3) an aliphatic or cycloaliphatic diamine and (4) a monofunctional chain terminator.