Coating agents of polyurethane dispersions and the use thereof for top coats and finishes

US4652466A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

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

Key dates

• Filing date: Mar 19, 1986
• Grant date: Mar 24, 1987
• Expiry date: Mar 19, 2006

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/3158
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

This invention relates to coating compositions based on aqueous polyurethane dispersions, as well as the use of the coating compositions for the production of top coats or finishes on flexible substrates, particularly on PVC. The present coating agents contain an aqueous polyurethane dispersion having certain physico-chemical properties and the following composition of the solid substance: PA1 (A) from about 30 to 60%, by weight, of a hexane diol-1,6-polyester diol having a molecular weight of from about 500 to 6000; PA1 (B) up to about 8%, by weight, of a relatively low molecular weight triol having a molecular weight of from about 91 to 399; PA1 (C) from about 3 to 30%, by weight, of one or more mono- or poly-functional compounds bearing cationic and/or anionic groups and/or containing non-ionic polyoxyethylene segments; PA1 (D) from about 20 to 50%, by weight, of a diisocyanate corresponding to the following general formula: ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3, which may be the same or different, each represents hydrogen or a straight- or branched-chain aliphatic hydrocarbon radical containing from 1 to 4 carbon atoms; PA1 (E) from about 2.5 to 20%, by weight, of other…