Production of monodisperse spherical polymers using seed polymers with a comb structure

US6291553A · kind A · utility

Assignee

• Agfa-Gevaert NV · BE

Inventors

• David Harrison · Leverkusen, DE
• Wolfgang Podszun · Neunburg vorm Wald, DE
• Frank Louwet · Diepenbeek, BE

Key dates

• Filing date: Oct 15, 1999
• Grant date: Sep 18, 2001
• Expiry date: Oct 15, 2019

Classification

• Technology area (CPC G): Physics
• CPC primary: G02F1/13392
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Producing spherical polymers having a weight-averaged average particle diameter of 1 to 50 .mu.m using a seed/feed process comprising the following steps: a) suspension of a monodisperse spherical seed in an aqueous phase, b) addition of at least one monomer and an initiator, c) polymerization of the monomer, of which there is at least one, wherein the seed consists of a polymer having a comb structure, gives rise to products having a particularly narrow grain size distribution.