Process for the production of bead polymers

US4233424A · 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: Nov 11, 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 10 to 120.mu., and comprising (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, the methacrylic ester polymer, optionally, containing up to 30% by weight of copolymerized units of at least one monomer selected from acrylic acid esters containing from 1 to 10 carbon atoms in the aliphatic saturated alcohol component, hydroxyalkyl esters of methacrylic acid containing from 2 to 4 carbon atoms in the alkyl group, styrene, vinyl acetate, (meth)acrylamide, (meth)acrylic acid and/or itaconic acid, and (B) 0.5 to 12% by weight of a polyurethane.