Abstract:
Water-dispersible polyurethane-polyureas (I), obtd. by reacting (a) organic polyisocyanate(s) with (b) isocyanate-reactive polyester-polyol(s) obtd. from (i) dicarboxylic acid(s), (ii) diol(s) and opt. (iii) polyfunctional component(s) with OH and/or COOH gps., (c) opt. an isocyanate-reactive fatty acid deriv., (d) opt. a higher-functional OH and/or COOH gp.-contg. cpd. with a functionality of more than 2, (e) a polyalkylene glycol with a mol. wt. of 750-10,000 and (f) an active H-contg. cpd. in which the active H reacts with the NCO gps. faster than water, with a ratio of (NCO gps.):(NCO-reactive H atoms) = (0.6:1)- (1:1), to give a prod. contg. 10-60 wt% of polyester units and 25-75 wt% of glycol units.
Abstract:
Aq. alkyd resin emulsions (I), contg. (a) an alkyd resin made from (a1) a fatty acid or an oil and (a2) higher-functional cpd(s). with OH and/or COOH as functional gps., and (b) an emulsifier, in which all the raw materials required for components (a) and (b) can be obtd. exclusively from replaceable sources. Also claimed are coating materials contg. (I).
Abstract:
Water-dilutable 2-component coating materials (I), contg. (a) an isocyanate component with a viscosity of 50-10,000 mPa.s at 23 degrees C, consisting of polyfunctional isocyanate(s), and (b) an alkyd resin emulsion, contg. (b1) 60-98 wt% alkyd resin(s) (based on solids), (b2) 2-40 wt% OH-functional emulsifier(s) (based on solids), (b3) opt. up to 15 wt% organic solvent (based on emulsion), and (b4) water. Also claimed is: (i) a process for the prodn. of (I) by transferring an alkyd resin into the aq. phase with the aid of OH-functional emulsifiers and then emulsifying polyisocyanate in this emulsion; (ii) a process for the prodn. of coatings using (I); (iii) a process for the prodn. of multilayer coatings, in which at least one of the coating materials used contains (I).
Abstract:
Hydrophilic polyurethane-polyureas (I) are obtd. by reacting (A) polyisocyanate(s) with (B) fatty acid deriv(s). which is/are reactive towards (a), (C) opt. a cpd. with more than 2 OH and/or COOH gps., (D) a polyalkylene glycol with a mol. wt. of 500-10,000 and (E) a cpd. with active H atom(s) which react more rapidly than water with NOC gps., with a mole ratio of (NCO gps.):(all NCO-reactive H atoms in A-E) = (0.5:1)-(2:1). Pref. mole ratio of (NCO gps.):(H atoms in OH and amino gps. in all components A-E) = (0.7:1)-(1.5:1); amts. of co-reactants are 0.1-1 mole (B), 0-0.8 mole (C), 0.1-0.8 mole (D) and 0.01-0.3 mole (E) to 1 mole (A). (B) comprise opt. unsatd. cpds., pref. fatty alcohols, fatty amines, or ethoxylated fatty alcohols or amines contg. 1-30 ethylene oxide (EO) units, esp. ethoxylated fatty alcohols with 1-20 EO units, or reaction prods. of fatty acids with polyols which may also contain amino gps., or reaction prods. of fatty acids and mono-epoxides. (C) is a bis-hydroxy-alkanecarboxylic acid, pref. dimethylolpropionic acid (DMPA).