Process for the preparation of coatings from polyurethane single component systems and steam

US4816542A · kind A · utility

Assignee

• Elastogran Polyurethane GmbH · DE

Inventors

• Herbert Liebl · Wien, AT
• Peter Roche · Grafing, DE
• Matthaeus Rank · Olching, DE

Key dates

• Filing date: May 13, 1988
• Grant date: Mar 28, 1989
• Expiry date: May 13, 2008

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09D175/04
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to a process for the preparation of coatings by reacting polyurethane single component systems, which preferably contain at least one prepolymer containing NCO groups in bonded form and a latent hardener, whereby the polyurethane single component system is mixed with steam at a temperature from 100.degree. C. to 500.degree. C., and fed under a pressure of 0.5 to 10 bars, and finally sprayed using a general spray method. The coatings so formed cure bubble free independent of the moisture content of the surroundings and without exhibiting coating mass runoff.