Polyurethane dispersions and the use thereof as finishing agents

US4876302A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Klaus Noll · Cologne, DE
• Wilhelm Thoma · Leverkusen, DE
• Klaus Nachtkamp · Cologne, DE
• Walter Schroer · Leverkusen, DE
• Josef Pedain · Cologne, DE

Key dates

• Filing date: Dec 15, 1988
• Grant date: Oct 24, 1989
• Expiry date: Dec 15, 2008

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2475/00
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention is directed to aqueous coating compositions suitable for use as coating and finishing agents for surface coatings, preferably PVC or polyurethane coatings, based on sedimentation-stable polyurethane dispersions having a solids content of about 10-70% by weight wherein the polyurethane-urea solids material is based on polyester diols, low molecular weight diols and optionally triols, chemically incorporated hydrophilic groups, specific mixtures of diisocyanates and polyamine chain extenders having an average functionality of greater than 2 and wherein the aqueous preparations additionally contain alkoxylated dimethyl-polysiloxanes and water-soluble polyethylene oxides. The present invention is also directed to a process for applying top coats and finishes to surface coatings, preferably PVC or polyurethane surface coatings, wherein the above-described aqueous coating and finishing agents are used as the top coat and the coatings are cured at about 70.degree.-170.degree. C.