Multistage aqueous dispersion of polymer particles having a soft core and hard shell

US6605662B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Cheng-Le Zhao · Charlotte, US
• Joachim Roser · Dessel, BE
• Eckehardt Wistuba · Bad Dürkheim, DE
• Bernhard Schuler · Austin, US
• Klemens Mathauer · Ludwigshafen, DE

Key dates

• Filing date: May 15, 2001
• Grant date: Aug 12, 2003
• Expiry date: May 15, 2021

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S526/902
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for preparing aqueous polymer dispersions comprises first of all subjecting ethylenically unsaturated monomers to free-radical aqueous emulsion polymerization to prepare an aqueous dispersion of a polymer 1 having a glass transition temperature Tg1, then dissolving further, comparatively hard monomers in the dispersed particles of the polymer 1, and subsequently carrying out free-radical polymerization of said monomers dissolved in said particles.