Process for the preparation of bead polymers of uniform particle size by polymerization of microencapsulated monomer

US4427794A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Peter M. Lange · Leverkusen, DE
• Werner Struver · Leverkusen, DE

Key dates

• Filing date: Aug 7, 1981
• Grant date: Jan 24, 1984
• Expiry date: Aug 7, 2001

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F2/00
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Process for the production of bead polymers of improved uniform particle size and uniform quality comprising (a) producing droplets which have a uniform particle size from the monomer or polymerization mixture to be polymerized by spraying the monomer or polymerization mixture into a liquid (continuous phase) which is essentially immiscible with the monomer or polymerization mixture, (b) encapsulating these droplets of uniform size are by shells which are stable under the polymerization conditions to be used and (c) then polymerizing the encapsulated droplets, and with the provision to maintain in the process steps of droplet production and encapsulation of the droplets certain special conditions.