Water-miscible oil-modified polyurethane resin prodn - from excess diisocyanate and hydroxy ester with drying oil in unsatd fatty acid component, for improved drying

摘要

Oxidatively drying polyurethane resins, which can be diluted or dispersed with water, are produced by (I) reacting (a) 25-55 (wt.)% unsatd. fatty acids (of which 0-25% are drying oils), opt. as adducts with is not >6% maleic anhydride and with 12 no. 130-390, (b) 2-15% (cyclo)aliphatic or aromatic (hydroxy)carboxylic acid(s) or their anhydrides, (c) 2-30% org. poly-OH cpds. and (d) 4-9% polyoxyalkylene cpd(s). with is not 2 active H atoms and mol. wt. 2000-6000 (ca. 3000); (II) reacting the resultant OH and opt. COOH-substd. ester with excess (f) 5-25 (10-25)% diisocyanate(s) by heating and (III) opt. conveting to the form which can be diluted or dispersed with water by adding alkali and/or strong org. bases. These gives coating compsns. with improved drying properties, excellent film quality, with high gloss after drying, good storage qualities and excellent flow.