Solvent-free polyurethane dispersion

US6635723B1 · kind B1 · utility

Assignee

• SKW Bauchemie GmbH · DE

Inventors

• Alois Maier · Waldkraiburg, DE
• Franz Wolfertstetter · Palling, DE
• Herbert Winkelmann · Garching bei München, DE
• Josef Weichmann · Pleiskirchen, DE
• Alfred Kern · Schneeberg, DE

Key dates

• Filing date: Oct 30, 2000
• Grant date: Oct 21, 2003
• Expiry date: Oct 30, 2020

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09D175/08
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A description is given of a solvent-free polyurethane dispersion having a high solids content of polyurethane polymer or fillers, which is obtainable bya) allowing a relatively high molecular weight polyol component (A) (i) and, if desired, a low molecular weight polyol component (A) (ii) to react with a polyisocyanate component (B) in the presence or absence of a catalyst to give a polyurethane preadduct, thenb) reacting the polyurethane preadduct from step a) with a low molecular weight and anionically modifiable polyol component (A) (iii) containing two or more hydroxyl groups and one or more carboxyl groups to give the corresponding prepolymer,c) allowing the prepolymer from step b) to react with a neutralization component (C) until the carboxyl groups have been completely or partially neutralized, subsequently or simultaneouslyd) dispersing the neutralized prepolymer from step c) in water which may further comprise a formulation component (F) comprising fillers, pigments, plasticizers, fibrous materials and other customary additives, subsequentlye) reacting the dispersion from step d) with a chain extension component (D), andf) if desired, allowing the dispersion from step e) …