Dispersing agents for aqueous coatings compositions

US5910556A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Christian Wamprecht · Neuss, DE
• Oswald Wilmes · Recklinghausen, DE
• Stephan Kirchmeyer · Leverkusen, DE
• Jan Mazanek · Cologne, DE

Key dates

• Filing date: Aug 20, 1997
• Grant date: Jun 8, 1999
• Expiry date: Aug 20, 2017

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K23/16
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to a process for the solvent-free production of polyisocyanate addition products, which are suitable as dispersing agents for incorporating solids into aqueous coating compositions, wherein the polyisocyanate addition products have a maximum content of 1% by weight of isocyanate groups and a content of 30 to 95% by weight of ethylene oxide units (molecular weight=44) present in the polyether chains of monofunctional alcohols B), and are prepared by reacting PA1 A) a polyisocyanate component having an average NCO functionality of 1.7 to 2.5 and an NCO content of 10 to 65% by weight with one or more of the following components: PA1 B) monohydric polyether alcohols having a number average molecular weight of 150 to 5000 and an ethylene oxide content of 40 to 99.5% by weight, PA1 C) monohydric alcohols having a number average molecular weight of 32 to 5000, which are different from the alcohols of component B), PA1 D) an amine component which contains at least one tertiary amine having a molecular weight of 88 to 250 and which contains one isocyanate-reactive group and PA1 E) compounds having a number average molecular weight of 32 to 5000 and at least two…