Method for producing self- emulsifiable aqueous polyurethane resins having improved characteristics

US6855764B2 · kind B2 · utility

Assignee

• SKW Bauchemie GmbH · DE

Inventors

• Alois Maier · Waldkraiburg, DE
• Stefan Ingrisch · Seebruck, DE
• Alfred Kern · Schneeberg, DE

Key dates

• Filing date: Dec 7, 2000
• Grant date: Feb 15, 2005
• Expiry date: Oct 11, 2021

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G18/12
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A method for producing self-emulsifiable, aqueous polyurethane resins by a) preparing a premix of polyol component including a least one diol having a molar mass of 500 to 5,000 Dalton, at least one polyhydroxyalkane at least one anionically modifiable dihydroxyalkane-carboxylic acid and 0 to 9 parts by weight of a solvent component in desired ratios; b) reacting a polyisocyanate component the premix from stage a) to give a polyurethane preadduct, c) reacting the polyurethane preadduct from stage b) with either the premix from stage a) or with an anionically modifiable dihydroxyalkanecarboxylic acid to give a polyurethane prepolymer; d) mixing the polyurethane prepolymer from stage c) with a prepared mixture of water, a neutralizing component and an antifoam component; and thereafter or simultaneously reacting the aqueous polyurethane prepolymer from stage d) with a chain-extending component which is diluted with water.