Abstract: The present invention relates to a process for preparing urethanes containing (meth)acryloyl groups that are suitable as binders for powder coatings by reacting a polyisocyanate component with a hydroxyl group-containing component that contains at least one compound additionally containing (meth)acryloyl groups in a melt of compounds containing (meth)acryloyl groups, which are crystalline in the solid state and have a melting point of 30 to 100° C. and a dynamic viscosity at 111° C. of less than 10 Pa·s, at elevated temperature until the NCO content has dropped below 0.5 wt. %. The present invention also relates to the use of these urethanes as binders for powder coating compositions for coating substrates made of wood, metal, plastics or mineral substances, which may have been primed.

Abstract: The present invention relates to pulverent binders for powder coating compositions which contain oligo- and polyurethanes having (meth)acryloyl groups, are curable by means of high energy radiation and have an organic solvent content of less than 1 wt. %. The present invention also relates to a process for preparing these binders in the absence of an organic solvent and to their use in powder coating compositions for coating wood, metal, plastic, mineral and/or preprimed substrates.

Abstract: The present invention relates to a process for preparing urethanes containing (meth)acryloyl groups that are suitable as binders for powder coatings by reacting a polyisocyanate component with a hydroxyl group-containing component that contains at least one compound additionally containing (meth)acryloyl groups in a melt of compounds containing (meth)acryloyl groups, which are crystalline in the solid state, and have a melting point of 30 to 100° C. and a dynamic viscosity at 111° C. of less than 10 Pa·s, at elevated temperature until the NCO content has dropped below 0.5 wt. %.

Abstract: The present invention relates to urethane acrylates, which may be cured with high-energy radiation, in which the urethane acrylates are the reaction product of a) a polyisocyanate component containing 20 to 100 mole %, based on the moles of the polyisocyanate component a), of iminooxadiazine dione group-containing polyisocyanate trimers corresponding to formula A  wherein R1, R2and R3 are the same or different and represent linear or branched, C4-C20 (cyclo)alkyl groups and X is the same or different and represents isocyanate groups or isocyanate group-containing radicals that also contain iminooxadiazine dione, isocyanurate, uretdione, urethane, allophanate, biuret or oxadiazine trione groups, wherein R1, R2 and R3 are attached to a nitrogen atom, with b) an alcohol component containing at least one monobasic, hydroxy-functional, linear or branched C1-C12 alkyl ester of (meth)acrylic acid.

Abstract: A process for the preparation of coatings using a coating composition having a binder containing a two-component system of a) a polyisocyanate component and b) an isocyanate-reactive component b) which is essentially free from hydroxyl groups and contains b1) 5 to 95 parts by weight of a polyamine containing ester groups and secondary amino groups and b2) 5 to 95 parts by weight of polyketimines.

Abstract: The present invention relates to aminoacrylates which have a viscosity of 200 to 3000 mPa.s at 23.degree. C. and 100% solids, a content of olefinic double bonds (calculated as C=C, molecular weight=24) of 8 to 20% by weight and a nitrogen content of 0.4 to 2.0% by weight, and which are prepared by an addition reaction by reacting at a molar ratio of primary amino groups from component a) to olefinic double bonds from component b) of 0.05:1 to 0.25:1a) mono- or diamines having a molecular weight of 31 to 300 and having aliphatically bound amino groups withb) acrylic esters of polyhydric alcohols which have been prepared at a COOH/OH equivalent ratio of 0.8:1 to 1:1 fromb1) acrylic acid andb2) ether-alcohols which have 3 or 4 hydroxyl groups and a molecular weight of 136 to 1000, possess at least one ethylene oxide unit --CH.sub.2 --CH.sub.2 --O-- as part of the ether structure and do not contain propylene oxide units --CH.sub.2 --CH(CH.sub.3)--O--.

Abstract: A coating composition in which the binding agent is a two-component system containing a) a polyisocyanate component and b) an isocyanate-reactive component and contains b1) specific ester group-containing secondary polyamines, b2) specific moisture-activatable blocked polyamines and b3) optionally other known compounds containing isocyanate-reactive groups, and a process for preparing coated substrates from this coating composition.

Abstract: N-alkoxysilylalkyl-aspartic acid esters are prepared by the reaction of equimolar quantities of amino-alkyl alkoxysilanes with maleic or fumaric acid esters. These N-alkoxysilylalkyl-aspartic acid esters are particularly useful as reactants in the preparation of prepolymers containing alkoxysilane and urea groups.

Abstract: The present invention relates to isocyanatocarboxylic acids containinga) 1 to 30% by weight of isocyanate groups attached to (cyclo)aliphatic tertiary carbon atoms andb) 0.5 to 500 milliequivalents, per 100 g of isocyanatocarboxylic acids, of carboxyl groups which may be at least partially present in carboxylate salt form.The present invention also relates to a process for the preparation of these isocyanatocarboxylic acids and to their use as cross-linking agents for aqueous coating compositions.

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.