Process for the preparation of aqueous polymer dispersions the dispersions obtained by the process and their use for the production of coatings

US4918135A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Joachim Probst · Leverkusen, DE
• Walter Schafer · Leichlingen, DE
• Klaus Schuster · Leverkusen, DE
• Heinrich Alberts
• Hanns P. Muller · Leverkusen, DE
• Adolf Schmidt · Adelsheim, DE
• Wolfhart Wieczorrek · Cologne, DE

Key dates

• Filing date: Apr 10, 1989
• Grant date: Apr 17, 1990
• Expiry date: Apr 10, 2009

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09D133/06
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

An improved coating for heat resistant substrates is an aqueous dispersion of polymers prepared by polymerization of olefinically unsaturated monomers in an aqueous medium in the presence of radical formers and emulsifiers, wherein the emulsifiers are polyisocyanate addition products having a molecular weight below 20,000 and containing from 5 to 1000 milliequivalents of anionic structures corresponding to the following formula EQU --NH--CO--N.sup..crclbar. --C.tbd.N incorporated therein per 100 g of solids content.