Method for making aqueous dispersions of a synthetic resin

US4456726A · kind A · utility

Assignee

• Rohm Co., Ltd. · JP

Inventors

• Werner Siol · Pfungstadt, DE
• Herbert Fink · Emmelshausen, DE
• Wolfgang Klesse · Mainz, DE
• Hubert Rauch · Weiterstadt, DE
• Norbert Suetterlin

Key dates

• Filing date: Oct 18, 1982
• Grant date: Jun 26, 1984
• Expiry date: Oct 18, 2002

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F291/00
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

What is disclosed is making highly concentrated, bimodal, aqueous synthetic resin dispersions by the emulsion polymerization of ethylenically unsaturated monomers, in the presence of emulsifiers and free radical-forming initiators, by adding to a first latex containing a first dispersed synthetic resin and an aqueous phase, a second latex containing a second dispersed synthetic resin and an aqueous phase and a monomer phase containing a free-radically polymerizable monomer, and then polymerizing the monomer, the average size of the particles of said first resin differing by a factor between 2 and 15 from that of the particles of second resin, the total weight of the resins and monomers representing 100 parts by weight, and the total weight of the aqueous phases representing not more than 70 parts by weight.