Abstract: The present invention relates to polyisocyanate mixtures prepared from 1,6-diisocyanatohexane (HDI) and 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethyl cyclohexane (IPDI), which have a uretdione content (calculated as C.sub.2 N.sub.2 O.sub.2) of 8 to 25% by weight and an isocyanurate content (calculated as C.sub.3 N.sub.3.sub.O.sub.3) of not more than 24% by weight and containa) 20 to 60% by weight of uretdione diisocyanatesb) 0 to 40% by weight of isocyanurate triisocyanatesc) 15 to 60% by weight of higher homologues of the polyisocyanates of components a) and b) containing more than one uretdione ring and/or isocyanurate ring andd) a total of not more than 1% by weight of (HDI) and (IPDI).The present invention also relates to a process for the preparation of these polyisocyanate mixtures and to their use, optionally blocked with blocking agents for isocyanate groups, as the isocyanate component in polyurethane coating compositions.

Abstract: This invention relates to an aqueous coating composition containing aluminum pigments and a water dispersible polyurethane polyurea binder which contains(i) at least 200 milliequivalents per 100 g of solids of chemically incorporated carbonate groups --O--CO--O-- and(ii) a combined total of up to 320 milliequivalents per 100 g of solids of chemically incorporated urethane groups --NH--CO--O-- and chemically incorporated urea groups --NH--CO--NH--.The invention further relates to coatings prepared from the aqueous coating composition.

Abstract: The present invention relates to polyisocyanate mixtures havinga) an average NCO functionality of 1.5 to 4.0,b) a content of (cyclo)aliphatically bound isocyanate groups (calculated as NCO, MW 42) of 2 to 40% by weight,c) a content of chemically incorporated carboxyl groups (calculated as COOH, MW 45) of 0.01 to 15% by weight andd) a content of (cyclo)aliphatically bound uretdione groups (calculated as C.sub.2 N.sub.2 O.sub.2, MW 84) of 1 to 23% by weight.The present invention also relates to processes for the production of these polyisocyanate mixtures and to their use, optionally after at least partial neutralization with tertiary amines, as binders for coating compositions which may be crosslinked under the effect of moisture and/or heat and as reactants for compounds containing isocyanate- and/or carboxyl-reactive groups in the production of high molecular weight plastics.

Abstract: The present invention is directed to water dispersible or soluble polyurethanes containing about 0.5 to 30% by weight, based on the weight of the polyurethanes, of ethylene oxide units present in lateral or terminal polyether chains, characterized in that in addition to these ethylene oxide units the polyurethanes contain, as further hydrophilic centers, about 0.1 to 120 milliequivalents, per 100 g of solids content, of carboxylate groups in the form of built-in structural units corresponding to the general formula ##STR1## wherein R denotes an alkyl group having 1 to 4 carbon atoms and the total quantity of carboxylate groups and ethylene oxide units present in lateral or terminal chains is calculated to ensure the solubility or dispersibility of the polyurethanes in water.The present invention also relates to a process for the preparation of these polyurethanes and to their use for coating substrates.

Abstract: The present invention is directed to a process for the production of aqueous polyurethane-polyurea dispersions by reacting NCO-prepolymers having an average NCO-functionality of 2 to 2.3 and an average molecular weight of about 700 to about 5000 with organic polyamines having an average amine functionality of 2.05 to about 3 and an average molecular weight of 60 to about 2000 containing primary and/or secondary amino groups at an NCO/NH ratio about 1.05:1 to about 7:1 in the presence of a water-miscible, weakly polar solvent inert to isocyanate groups and having a boiling point at normal pressure below 100.degree. C., converting the resulting solution of the reaction products into an aqueous dispersion by the addition of water and optionally removing the solvent used by distillation, characterized in that the reactants and amounts used are selected such that the resulting reaction products have an NCO-functionality of 2.2 to about 3 and NCO-content of about 0.1 to 5% by weight.