Abstract: The present invention describes two-component coating compositions which for curing require no polyisocyanates or melamine-formaldehyde resins as crosslinkers.

Abstract: Hyperbranched polycarbonates having stabilizing groups, prepared by reaction of (a) at least one compound having at least three alcoholic hydroxyl groups per molecule with (b) at least one reagent of the general formula I (c) and at least one reagent of the general formula X3-(A1)m-X4, where the variables are defined as follows: X1, X2 are identical or different and are selected from among halogen, C1-C10-alkoxy, C6-C10-aryloxy and O—C(?O)-halogen, X3 is a functional group selected from among OH, SH, NH2, NH—C1-C4-alkyl, iso-cyanate, epoxy, COOH, COOR12, C(?O)—O—C(?O), C(?O)—Cl, R12 is C1-C4-alkyl or C6-C10-aryl, A1 is a spacer or a single bond, m is zero or one. X4 is a group selected from among phenol groups, benzophenones, aromatic amines and nitrogen-comprising heterocycles, in each case substituted or unsubstituted.

Abstract: The present invention describes two-component coating compositions which for curing require no polyisocyanates or melamine-formaldehyde resins as crosslinkers.

Abstract: The present invention relates to a process for preparing polyisocyanates comprising biuret groups from diisocyanates or polyisocyanates and diamines.

Abstract: A nongelling and noncrosslinked, highly branched or hyperbranched polyester, obtained by reacting at least one selected from the group consisting of a monocarboxylic acid, a dicarboxylic acid, a tricarboxylic acid, a polycarboxylic acid, and a derivative thereof with at least one selected from the group consisting of a monoalcohol, a diol, a triol, a tetraol, and a polyol, wherein an average functionality of the carboxyl groups (f.A) and the hydroxyl groups (f.B) in a notionally hydrolyzed polyester satisfies a relation: f.A+f.B>4, a mole fraction of the carboxyl groups (x.A) in the notionally hydrolyzed polyester satisfies a relation: f.A/[(f.A*f.B)+f.A]?x?(f.A*f.B)/[(f.A*f.B)+f.B], and a degree of conversion (U) of the deficit functionality satisfies a relation: U.min?U?U.max.

Abstract: Hyperbranched polycarbonates having stabilizing groups, prepared by reaction of (a) at least one compound having at least three alcoholic hydroxyl groups per molecule with (b) at least one reagent of the general formula I (c) and at least one reagent of the general formula X3-(A1)m-X4, where the variables are defined as follows: X1, X2 are identical or different and are selected from among halogen, C1-C10-alkoxy, C6-C10-aryloxy and O—C(?O)-halogen, X3 is a functional group selected from among OH, SH, NH2, NH—C1-C4-alkyl, iso-cyanate, epoxy, COOH, COOR12, C(?O)—O—C(?O), C(?O)—Cl, R12 is C1-C4-alkyl or C6-C10-aryl, A1 is a spacer or a single bond, m is zero or one. X4 is a group selected from among phenol groups, benzophenones, aromatic amines and nitrogen-comprising heterocycles, in each case substituted or unsubstituted.

Abstract: A tensioner for a traction drive includes a cylinder arranged in a housing at a distance to a housing wall to thereby define an interior space which contains hydraulic fluid. A piston is received in the cylinder for back-and-forth movement and bounds a pressure chamber containing hydraulic fluid. The piston has a cylinder-distal end which is operatively connected to a spring-biased tension roller supported on a traction member. Formed between the piston and the cylinder is a leakage gap, and a reservoir for hydraulic fluid is provided in an area of the leakage gap to prevent ingress of air into the pressure chamber, when the traction drive is at a rest.

Abstract: High-functionality highly branched or hyperbranched polyesters based on di-, tri- or polycarboxylic acids and di-, tri- or polyols, processes for preparing them, and their use.

Abstract: Stabilizers composed of (I) one or more polyisocyanates having an average of from 2 to 10 isocyanate groups per molecule, preferably from 2.1 to 10, particularly preferably from 2.2 to 10, (II) per mole of isocyanate groups, from 0.1 to 1.0 mol of one or more active ingredient groups which protect plastics from degradation via heat, UV radiation, oxidation, hydrolysis, or mechanical action during processing, where the active ingredient groups have been linked to the polyisocyanates by way of functional groups A which can react with the isocyanate groups, and where the active ingredient groups have been selected from phenols, sterically hindered amines (HALS stabilizers), benzotriazoles, benzophenones, aromatic amines, or phosphites; (III) per mole of isocyanate groups, from 0 to 0.9 mol of one or more auxiliary groups which modify the properties of the stabilizer, where the auxiliary groups have been linked to the polyisocyanates by way of functional groups B which can react with the isocyanate groups.

Abstract: Low-viscosity preparations of isocyanate compounds in solvents, and their use.

Abstract: High-functionality, highly branched or hyperbranched polycarbonates based on dialkyl or diaryl carbonates or phosgene, diphosgene or triphosgene and on aliphatic, aliphatic/aromatic, and aromatic diol or polyols, and their use for producing paint systems.

Abstract: Hydrocarbon streams are hydrogenated catalytically without using a different solvent from the hydrocarbon stream to be hydrogenated, with a basic compound being added to the starting-material stream. The formation of undesired secondary components on the catalyst is thereby effectively prevented.

Abstract: Water-dispersible, high-functionality, highly branched or hyperbranched polyisocyanates, process for preparing them and their use.

Abstract: A tensioner for a traction drive includes a cylinder arranged in a housing at a distance to a housing wall to thereby define an interior space which contains hydraulic fluid. A piston is received in the cylinder for back-and-forth movement and bounds a pressure chamber containing hydraulic fluid. The piston has a cylinder-distal end which is operatively connected to a spring-biased tension roller supported on a traction member. Formed between the piston and the cylinder is a leakage gap, and a reservoir for hydraulic fluid is provided in an area of the leakage gap to prevent ingress of air into the pressure chamber, when the traction drive is at a rest.

Abstract: Hydrocarbon streams are hydrogenated catalytically without using a different solvent from the hydrocarbon stream to be hydrogenated, with a basic compound being added to the starting-material stream. The formation of undesired secondary components on the catalyst is thereby effectively prevented.

Abstract: In a process for producing polyurethane foams by reacting isocyanates with compounds having at least two hydrogen atoms which are reactive toward isocyanate groups, the isocyanates used are (cyclo)aliphatic isocyanates and the reaction is carried out in the presence of substances which effect framework formation in the polyurethane foam.

Abstract: A supported metal oxide catalyst for the decomposition of ammonia and hydrogen cyanide in coke-oven gas is free of noble metals and comprises, based on the total catalyst, from 2 to 5.5% by weight of NiO and from 0.5 to 3.5% by weight of CoO on an MgO support. This catalyst is used in a process for the single-stage catalytic decomposition of ammonia and hydrogen cyanide in coke-oven gas before the latter is fed to a Claus desulfurization plant.