Process for the preparation of coating compositions, aqueous dispersions of PU reactive systems and their use for coating

US4507413A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Wilhelm Thoma · Leverkusen, DE
• Rolf Langel · Leverkusen, DE
• Anton Schmitz · Dormagen, DE
• Walter Schroer · Leverkusen, DE

Key dates

• Filing date: Aug 8, 1983
• Grant date: Mar 26, 1985
• Expiry date: Aug 8, 2003

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31591
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention is directed to a process for the preparation of finely dispersed, easily spreadable, aqueous polyurethane reactive coating compositions suitable for coating textile sheet products, artificial leather or leather by the direct or transfer coating process by PA0 (i) forming an aqueous dispersion having a solids content of about 20-69 wt. % of blocked isocyanate prepolymers in the presence of from about 0.05-5% by weight of emulsifiers, PA0 (ii) adding during or after formation of the dispersion about 0.1 to 2.5% by weight of water soluble thickeners based on long chain polyethylene oxides, salts of poly(meth)acrylic acids or salts of carboxy methyl cellulose, up to 100% by weight of aqueous polymer solutions and/or polymer dispersions and optionally levelling agents, pigments, fillers or stabilizers and PA0 (iii) forming a coating composition having a viscosity of from about 3000 to 22,000 mPa.s/25.degree. C. and with a solids content of about 20-69% by weight, by adding approximately equivalent quantities of (cyclo)aliphatic di- and/or polyamines. The present invention is also directed to the coating compositions prepared by this process and their use for the re…