Particulate multiphase polymers

US4861831A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Volker Damrath · Burscheid, DE
• Christian Lindner · Bensheim, DE
• Hans-Jurgen Kress · Krefeld, DE
• Dieter Wittmann · Leverkusen, DE

Key dates

• Filing date: Feb 10, 1988
• Grant date: Aug 29, 1989
• Expiry date: Feb 10, 2008

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S525/902
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Particulate, multiphase polymers which have a core (A) and an overlying shell (B) wherein the core (A) is an organic, resinous polymer comprising polymerized olefinically unsaturated monomer units having softening point temperatures of at least 30.degree. C. and wherein the shell (B) is an organopolysiloxane are obtained by producing in a first stage an organic resinous polymer in latex form by emulsion polymerization and, in a second stage, the latex particles of the first stage are surrounded with a shell (B) organopolysiloxane by polymerizing low molecular weight organosiloxanes in the presence of the latex particles of the first stage.