Abstract:
The present invention relates to aqueous polyurethane-polyurea dispersions wherein the dispersions contain polyurethane-polyureas that are the reaction products of I) polyisocyanates having an isocyanate group functionality of ≧2, II) a polymeric polyol component containing a) 50% to 100% by weight, based on the weight of polyol component II), of polyester polyols having a number average molecular weight Mn of 200 to 8000 g/mol and synthesized from a hydroxyl component and an acid component wherein 50% to 100% by weight, based on the total weight of the hydroxyl component used to prepare polyester polyols II.a), are diols corresponding to formula 1), wherein n is 1 and/or 2, and b) 0% to 50% by weight, based on the weight of polyol component II), of polymeric polyols other than polyester polyols a), and III) optionally other isocyanate-reactive compounds. The present invention also relates to a process for preparing these aqueous dispersions, to coating compositions containing these aqueous dispersions and to substrates coated with these coating compositions, in particular leather and textile substrates.
Abstract:
The invention provides hydrolysis-stable size compositions based on polycarbonate polyols and polytetramethylene glycol polyols, their preparation and use.
Abstract:
Polyurethane which is obtainable by reacting a) an NCO-containing prepolymer composed of a1) at least one polyesterpolyol, preferably polycarbonatepolyol, carbonate group-free polyesterpolyol, polyestercarbonatepolyol, polyesteramidepolyol, in particular polyesterdiol, having an average molecular weight, determined as the number average, greater than or equal to 500 g/mol, preferably from 500 to 6000 g/mol, in particular from 500 to 4000 g/mol, very particularly preferably from 800 to 4000 g/mol, and a2) at least one polyetherpolyol which differs from a1) and is preferably polyalkylene glycol, such as polyethylene glycol, polypropylene glycol, polytetramethylene glycol, polyhexamethylene glycol and copolyethers, in particular those containing building blocks from the group consisting of ethyleneoxy, propyleneoxy, tetramethyleneoxy and/or hexamethyleneoxy, having a molecular weight, determined as the number average, greater than or equal to 500, preferably from 500 to 10 000 g/mol, in particular from 500 to 4000, particularly preferably from 800 to 4000, g/mol, preferably a polyetherdiol, and a3) at least one polyol, in particular diol, having a molecular weight of less than 500 g/mol, which carries one or more ionic groups and/or one or more potentially ionic groups, preferably carries one or more carboxylate groups, and a4) at least one aliphatic polyisocyanate, preferably diisocyanate, preferably having a molecular weight of less than 500 g/mol, in particular from 112 to 400 g/mol, particularly preferably from 168 to 262 g/mol, and a5) optionally a nonionic polyol, preferably diol having a molecular weight of less than 500 g/mol, preferably from 61 to 499 g/mol, and a6) optionally a monoalcohol with b) at least one polysiloxane reactive towards NCO groups and having a molecular weight, determined as the number average, of less than 1500 g/mol, preferably having 1 to 6, in particular 1 to 3, amino and/or hydroxyl groups reactive towards NCO groups, in particular amino groups, and c) at least one amine reactive towards NCO groups and having an average amino functionality of from 1 to 6 and a molecular weight of less than 500 g/mol (molecular weight determined as the number average), which may be substituted by hydroxyl groups and/or sulpho groups and/or carboxyl groups, and d) water, the molar ratio of the hydroxy-functional compounds used for the preparation of the prepolymer a) to the polyisocyanate being from 1: 1.1 to 1: 2.5, preferably from 1.1:1 to 1: 1.7.
Abstract:
The present invention relates to a coating composition containing: A) 25 to 50 wt. % of a polyisocyanate component, B) 5 to 20% wt. % of one or more polyaspartic acid esters C) 10 to 30 wt. % of one or more polyaldimines having a number average molecular weight of 112 to 600 D) 0.1 to 5.0 wt. % of an acetal corresponding to formula IV: E) 0.1 to 5.0 wt. % of castor oil. F) 0.1 to 10.0 wt. % of an organic solvent, G) 15 to 35 wt. % of a pigment and H) 0 to 10 wt. % of a coating additive other than D, F or G, wherein the sum of the percentages of components A to H is 100. The present invention also relates to the use of this coating composition as an anti-corrosive top coat.
Abstract:
The present invention relates to a new process for preparing mono and polyaspartates from primary mono and polyamines and maleates in presence of five-membered aromatic ring compounds containing nitrogen atoms in the ring structure as catalysts and use of these mono and polyaspartates as reactive components for polyisocyanates in two-component polyurethane coating compositions and for preparing polyurethane prepolymers.
Abstract:
The present invention relates to polyurethane dispersions comprising polysiloxane building blocks reactive towards isocyanates and processes for using their preparation and their use in coating leather.
Abstract:
The present invention relates to aqueous polyurethane-polyurea dispersions having two discrete maxima in the particle size distribution, wherein the maximum of the fine fraction is between 51 and 150 nm and the maximum of the coarse fraction is between 160 and 700 nm. The present invention also relates to a process for preparing the polyurethane-polyurea dispersions, to coating compositions containing these polyurethane-polyurea dispersions, and to coated substrates prepared from these coating compositions.
Abstract:
The invention relates to aqueous coating material compositions stable to hydrolysis, to a process for preparing them and to their use as soft feel paint. The compositions comprise hydroxyl-free polyurethanes and/or polyurethane-ureas based on polycarbonate polyols and polytetramethylene glycol polyols, ionically modified, hydroxyl- and/or amino-containing polyurethanes and/or polyurethane-ureas and at least one crosslinker, and optionally further film-forming resins.