Abstract: The invention relates to a method for producing polyurethanes containing silane groups by reacting at least A) a composition containing a) one or more compounds containing isocyanate and silane groups of general formula (I) and b) <=1 percent by weight, relative to the total mass of composition A), one or more monomeric diisocyanates with aliphatically, cycloaliphatically, araliphatically and/or aromatically bonded isocyanate groups of general formula (II), where R1, R2 and R3 are the same or different radicals and respectively indicate a saturated or unsaturated, linear or branched, aliphatic or cycloaliphatic or an optionally substituted aromatic or araliphatic radical with up to 18 carbon atoms, which can contain optionally up to 3 heteroatoms from the series oxygen, sulphur, nitrogen, X is a linear or branched organic radical with at least 2 carbon atoms and Y is a linear or branched, aliphatic or cycloaliphatic radical with 4 to 18 carbon atoms or an optionally substituted aromatic or araliphatic radi

Abstract: The invention relates to a method for producing polyurethanes containing silane groups by reacting at least A) a composition containing a) one or more compounds containing isocyanate and silane groups of general formula (I) and b)<=1 percent by weight, relative to the total mass of composition A), one or more monomeric diisocyanates with aliphatically, cycloaliphatically, araliphatically and/or aromatically bonded isocyanate groups of general formula (II), where R1, R2 and R3 are the same or different radicals and respectively indicate a saturated or unsaturated, linear or branched, aliphatic or cycloaliphatic or an optionally substituted aromatic or araliphatic radical with up to 18 carbon atoms, which can contain optionally up to 3 heteroatoms from the series oxygen, sulphur, nitrogen, X is a linear or branched organic radical with at least 2 carbon atoms and Y is a linear or branched, aliphatic or cycloaliphatic radical with 4 to 18 carbon atoms or an optionally substituted aromatic or araliphatic radic

Abstract: The present invention relates to an aqueous coating composition containing a) a urethane (meth)acrylate having (meth)acryloyl groups and optionally free isocyanate groups, b) optionally a further polyisocyanate, c) a UV initiator which initiates polymerization by a free radical mechanism, and d) one or more aqueous binders containing isocyanate-reactive groups. The present invention also relates to the use of the coating compositions for coating various substrates, especially metal substrates.

Abstract: An aqueous coating composition including a combination of hydroxyl group-containing polyols and blocked polyisocyanate cross-linking agents, which dries preferably in pulverulent manner on the surface to be coated and, after stoving, affords coatings having a high resistance to water, chemicals and solvents, in particular on metallic substrates, and a process for the production of the coating composition.

Abstract: An aqueous binder composition having a reduced tendency to yellow containingA) 20 to 95 wt-% of a water-dilutable organic polyol component that is present in the form of an aqueous solution or dispersion, contains one or more polymer-modified polyester resins which contain carboxylate groups and hydroxyl groups and has been prepared by the polymerization of olefinically unsaturated monomers in the presence of an unsaturated polyester resin that is copolymerized with the monomers andB) 5 to 80 wt-% of at least one heat-activatable cross-linking resin,wherein the percentages are based on the solids contents of components A) and B) and add up to 100%; and their use in heat-curable coating compositions.

Abstract: The present invention relates to aqueous polyurethane-urea dispersions having a resin solids content of at least 35 wt. % and a pH of at least 7.5 which are prepared bya) forming an isocyanate-terminated prepolymer by reacting a difunctional polyol having a molecular weight of 500 to 6000, a low molecular weight alcohol, a diisocyanate and/or triisocyanate and an isocyanate-reactive compound which has an acid group,b) neutralizing 65% to 95% of the acid groups prior to dispersing the prepolymer in water,c) dispersing the neutralized prepolymer in water,d) chain extending the isocyanate groups with water to form a polyurethane-urea, ande) after completion of the chain extending reaction adding additional neutralizing agent to provide a total amount of neutralizing agent that is sufficient to neutralize at least 115% of the acid groups of component D),wherein the polyurethane-urea contains 1.0 to 4.0%, based on resin solids, of the isolated urea groups.

Abstract: The present invention relates to a process for the production of aqueous dispersions which form powder coatings at room temperature, have an average particle size of 0.1 to 10 .mu.m, contain polyols and blocked polyisocyanate crosslinking agents, and, after stoving, yield coatings with improved water and solvent resistance, in particular on metallic substrates.

Abstract: The present invention relates to polyisocyanate-modified dicarboxylic acid derivatives obtainable by reacting organic polyisocyanates with excess quantities, based on the equivalent ratio of NCO/COOH groups, of dicarboxylic acid (poly)anhydrides containing free carboxyl groups and water. The present invention also relates to coating compositions, in particular powder coating compositions, containing these polyisocyanate-modified dicarboxylic acids as curing agents for resins containing epoxy groups.

Abstract: The present invention relates to novel aqueous or water-dilutable blocked polyisocyanates and to their use for the production of one-component polyurethane coating compositions, which are stovable at relatively low temperatures of 130.degree. to 150.degree. C. and provide clear coatings having substantially reduced thermal yellowing.

Abstract: A method is described for the preparation of aqueous coating compositions based on resin binders containing isocyanate-reactive hydrogen atoms and polyisocyanates, by mixing the components with water, wherein the mixture is forced at a pressure of from 1 to 30 MPa through a nozzle of small size in at least one dimension.

Abstract: Polyisocyanate-modified dicarboxylic (poly)anhydrides which are solid below 40.degree. C., liquid above 120.degree. C. and based on the reaction product of organic polyisocyanates with more than equivalent quantities, based on the NCO/COOH reaction, of dicarboxylic (poly)anhydrides containing free carboxyl groups and optional subsequent modification of the reaction product with less than equivalent quantities, based on the anhydride groups, of anhydride-reactive amino and/or hydroxyl groups; and powder coating compositions containing as binder these polyisocyanate-modified dicarboxylic (poly)anhydrides as curing agents for polyepoxides.

Abstract: Powder coating compositions based on A) copolymers prepared from olefinically unsaturated monomers, containing epoxide and anhydride groups and having a glass transition temperature T.sub.g of 30.degree. to 80.degree. C., an average molecular weight M.sub.n of 1,000 to 6,000 and a molecular weight distribution M.sub.w /M.sub.n of 2.5 to 10.0, B) a hardener component selected from (i) (cyclo)aliphatic dicarboxylic acids, (ii) anhydrides of such dicarboxylic acids, (iii) polyol-modified polymeric anhydrides of such dicarboxylic acids and (iv) aliphatic hydroxycarboxylic acids and optionally C) additional crosslinking agents in the form of polyaddition products having uretidione groups, and the use of these compositions for coating heat-resistant substrates.

Abstract: A powder coating composition for the production of non-yellowing, flexible coatings which contains a mixture of a polyisocyanate component which contains one or more lacquer polyisocyanates having free (unblocked) isocyanate groups bound to primary and/or secondary carbon atoms and a polyol component containing one or more polyhydroxyl compounds selected from polyhydroxy polyurethanes, polyhydroxy polyacrylates and polyhydroxy polyesters, wherein at least 50% of the hydroxyl groups are bound to secondary or tertiary carbon atoms; and its use for coating heat-resistant substrates, in particular as clear coating compositions for automobiles.

Abstract: A powder coating composition which is curable at 120.degree. to 150.degree. C. and contains A) one or more copolymers prepared from olefinically unsaturated monomers and containing epoxy groups and optionally hydroxyl groups, B) one or more curing agents containing carboxylic acid or carboxylic acid anhydride groups, and C) one or more polyaddition compounds which contain uretdione groups, have a melting point or range of 40.degree. C. to 120.degree. C. and are prepared from (cyclo)aliphatic diisocyanates; and its use for coating of heat-resistant substrates, especially automotive substrates.

Abstract: The present invention relates to polyisocyanate mixtures which are solid below 40.degree. C. and liquid above 125.degree. C. and which havea) an average isocyanate functionality of at least 2.1,b) a content of free isocyanate groups bonded to tertiary (cyclo)aliphatic carbon atoms (calculated as NCO; molecular weight=42) of 5 to 22 wt. %,c) a urethane group content calculated as --NH--CO--O--; molecular weight=59) of 2 to 30 wt. %,d) an isocyanurate group content (calculated as C.sub.3 N.sub.3 O.sub.3 ; molecular weight=126) of 0 to 30 wt. % ande) a carboxylic acid ester group content (calculated as --CO--O--; molecular weight=44) of 0 to 25 wt. % and/orf) a carbonate group content (calculated as --O--CO--O--; molecular weight=60) of from 0 to 34 wt. %with the proviso that the total amount of ester groups e) and carbonate groups f) is at least 2 wt. %.

Abstract: The present invention relates to water dilutable, urethane group-containing polyester polyols having an acid number of 6 to 45 mg KOH/g, wherein 25 to 100% of the acid groups are neutralized by bases, a hydroxyl number of 20 to 250 mg KOH/g, a molecular weight (M.sub.w) of 2,000 to 150,000 and a urethane content (--NH--CO--O--) of 2 to 16% by weight, wherein the polyester polyol is the at least partly neutralized reaction product ofa) 35 to 90% by weight of branched polyester polyols having a hydroxyl number of 40 to 600 and prepared froma1) 0 to 60% by weight of monocarboxylic acids,a2) 6 to 65% by weight of di- and/or tricarboxylic acids or their anhydrides,a3) 10 to 70% by weight of alcohols,a4) 0 to 35% by weight of monoalcohols,a5) 0 to 30% by weight of hydroxycarboxylic acids, aminocarboxylic acids, lactones, lactams and aminoalcohols anda6) 0 to 45% by weight of polycarbonate polyols,b) 0.5 to 8.5% by weight of hydroxycarboxylic acidsc) 0 to 15% by weight of compounds containing OH, NH and/or NH.sub.

Abstract: The present invention relates to a process for recovering and recycling the organic binder components accumulating during the spraying of a solvent-containing, two-component polyurethane coating or a solvent-containing, moisture-curing one-component polyurethane coating byi) forming a coatings slurry containing the organic binder components, water and a coagulating agent,ii) mixing the coatings slurry, optionally after removing a portion of the water, with an organic solvent which is inert towards isocyanate groups,iii) reacting the free isocyanate groups present in the mixture obtained in step (ii) with a compound containing one isocyanate-reactive group which is more reactive with isocyanate groups than both water and the isocyanate-reactive component of the two-component polyurethane coating, if present, andiv) removing any remaining water and insoluble components from the organic phase accumulating in step (iii) and recovering the organic phase containing the organic binder components.

Abstract: The present invention relates to a process for the preparation of a polyurethane coating by coating a substrate with a coating composition containinga) a polyisocyanate component andb) an isocyanate-reactive component containing at least one compound corresponding to the formula ##STR1## wherein X represents an organic group which has a valency of n and is inert towards isocyanate groups at a temperature of 100.degree. C. or less,R.sup.1 and R.sup.2 may be identical or different and represent organic groups which are inert towards isocyanate groups at a temperature of 100.degree. C. or less,R.sup.3 and R.sup.4 may be identical or different and represent hydrogen or organic groups which are inert towards isocyanate groups at a temperature of 100.degree. C. or less andn represents an integer with a value of at least 2,and curing the coating composition at a temperature of 100.degree. C. or less.

Abstract: The present invention relates to a process for the preparation of a polyurethane coating by coating a substrate with a coating composition containinga) a polyisocyanate component andb) an isocyanate-reactive component containing at least one compound corresponding to the formula ##STR1## wherein X represents an organic group which has a valency of n and is inert towards isocyanate groups at a temperature of 100.degree. C. or less,R.sup.1 and R.sup.2 may be identical or different and represent organic groups which are inert towards isocyanate groups at a temperature of 100.degree. C. or less,R.sup.3 and R.sup.4 may be identical or different and represent hydrogen or organic groups which are inert towards isocyanate groups at a temperature of 100.degree. C. or less andn represents an integer with a value of at least 2,and curing the coating composition at a temperature of 100.degree. C. or less.

Abstract: The present invention relates to polyisocyanates which contain ester groups and havea) a content of aliphatically bound isocyanate groups of 18 to 33% by weight,b) an average NCO functionality of 4.1 to 10, preferably from 4.5 to 10, andc) a viscosity of 200 to 2,5000 mPa.s at 22.degree. C.The present invention also relates to preferred polyisocyanates which contain ester groups and havea) a content of aliphatically bound isocyanate groups of 20 to 33% by weight,b) an average NCO functionality of 5 to 8 andc) a viscosity of 500 to 1,000 mPa.s at 22.degree. C.The present invention further relates to a process for the preparation of these preferred polyisocyanates by reacting isocyanatocarboxylic acid chlorides with O-silylated, polyhydric alcohols at a temperature of about 50.degree. to 150.degree. C. Finally, the present invention relates to the use of the polyisocyanates as the isocyanate component for two-component polyurethane coating compositions.