Stable aqueous polyurethane dispersions

US6017998A · kind A · utility

Assignee

• H.B. Fuller Licensing & Financing, Inc · US

Inventors

• Youlu Duan · Maplewood, US
• Yi Wei · Yorba Linda, US
• Yuduo Zhu · Woodbury, US
• Sonja Stammler · North Branch, US
• Brian L. Marty · Oakdale, US
• Gary J. Haider · Maplewood, US
• Ronald Davies · Windom, US
• Michael J. Maksymkiw · White Bear Lake, US

Key dates

• Filing date: Jun 17, 1998
• Grant date: Jan 25, 2000
• Expiry date: Jun 17, 2018

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31605
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention discloses a stable aqueous polyurethane dispersions comprising a reaction product of a water dispersible isocyanate-terminated polyurethane prepolymer (A), an aqueous polyurethane dispersion (B) and water, and a method wherein a water dispersible isocyanate-terminated polyurethane prepolymer (A) is dispersed in at least one aqueous polyurethane dispersion (B) and water, and reacted at about 35.degree. C. to about 95.degree. C. until substantially free of isocyanate. The inventive dispersions are useful in adhesives, coatings, binders, primers and sizers.