D - Textiles – Paper – 06 – N
Patent
D - Textiles, Paper
06
N
400/1323, 400/43
D06N 3/14 (2006.01) C08G 18/08 (2006.01) C08G 18/10 (2006.01) C08G 18/32 (2006.01) C09D 175/04 (2006.01) C14C 11/00 (2006.01)
Patent
CA 1241485
PROCESS FOR THE PREPARATION OF COATING COMPOSITIONS, AQUEOUS DISPERSIONS OF PU REACTIVE SYSTEMS AND THEIR USE FOR COATING ABSTRACT OF THE DISCLOSURE The present invention is directed to a process for the preparation of finely dispersed, easily spread- able, aqueous polyurethane reactive coating compositions suitable for coating textile sheet products, artificial leather or leather by the direct or transfer coating process by 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, 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 iii) forming a coating composition having a viscosity of from about 3000 to 22,000 mPa.s/25°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 reactive coating of substrates, particularly textile and leather or artificial leather substrates.
433680
Langel Rolf
Schmitz Anton
Schroer Walter
Thoma Wilhelm
Aktiengesellschaft Bayer
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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