Particulate multiphase polymers

US4859740A · 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 22, 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, rubber-like polymer comprising polymerized olefinically unsaturated monomer units having softening point temperatures below 0.degree. C. and wherein the shell (B) is an organopolysiloxane are obtained by producing in a first stage an organic rubber-like 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) or organopolysiloxane by polymerizing low molecular weight organosiloxanes in the presence of the latex particles of the first stage.