Abstract: The present invention is directed to a coating composition for use as topcoat lacquer on a multi-layer lacquer coating for substrates such as automobile bodies and parts. The coating composition is based upon a combination of hydroxyl-functional methacrylic copolymers, carboxy-functional blocked urethane prepolymers, crosslinking agents and optional hydroxyl-functional polyesters. The carboxy-functional polyurethane prepolymer is formed from a combination of organic diols, polycarboxylic acids, polyols, hydroxyl-carboxylic acids, aliphatic or aryl polyisocyanates and monofunctional isocyanate blocking agents. The lacquer coating according to the invention has a high sulfuric acid resistance and has a high solids content.

Abstract: A process for preparing aqueous coating agents with adjustable optical effects by mixing at least two storage-stable pre-mixed aqueous modules (units) is described, in whichA) at least one aqueous special effect module containing one or more special effect pigments, one or more anionic and/or non-ionic stabilised water-dilutable binders, one or more organic solvents, at least 20 wt. % of water and optionally conventional lacquer additives, andB) at least one aqueous binder module containing one or more anionic and/or non-ionic stabilised water-dilutable binders, water, and optionally one or more organic solvents, one or more cross-linking agents and/or conventional lacquer additives, are mixed together.

Abstract: Aqueous binder dispersions for aqueous coating compositions, which are stable in storage and have good applicational properties. The dispersions are obtainable by joint chain extension ofone or more polyurethanes containing no urea groups, bearing ionic groups or groups convertible into ionic groups, having substantially terminal OH groups and having a number average molar mass (M.sub.n) of 1,000 to 10,000, an acid value of 5 to 50 and an OH value of 5 to 50 andII. one or more polymers containing hydroxyl groups based on ethylenically unsaturated monomers, having an acid value of 0 to 20, an OH value of 150 to 400 and a number average molar mass (M.sub.n) of 2,000 to 20,000, wherein the molar ratio of the hydroxyl groups of component I to those of component II is 1:6 to 1.0:0.5, withIII. one or more diisocyanates, in a molar ratio of the OHgroups from components I and II to the NCO groups of component III of 1.

Abstract: A process is described for the multi-layer lacquer coating of a substrate by applying a base lacquer layer of an aqueous coating composition onto the optionally precoated substrate and subsequently overcoating with a clear lacquer, which contains:A) at least one copolymer containing hydroxyl groups which is obtainable by reactinga) one or more esters of aliphatic saturated monocarboxylic acids branched in .alpha.-position with one or more epoxide groups in the alcohol portion withb) one or more alkyl esters of .alpha., .beta.-ethylenically unsaturated carboxylic acids,c) one or more hydroxyalkyl esters of .alpha., .beta.-ethylenically unsaturated carboxylic acids,d) optionally one or more .alpha., .beta.-ethylenically unsaturated carboxylic acids ande) optionally one or more vinyl monomers differing from a), b), c) and d),B) one or more polyisocyanates with an average of at least 1.

Abstract: A process is described for the production of a multicoat lacquer finish by application of a base coat layer of an aqueous coating agent to a substrate and subsequent application of a layer of a clear coat containing an organic solvent, that leads to coatings with excellent hardness and gloss. For this purpose, for the production of the base coat layer an aqueous coating agent is applied that contains, in addition to water, one or more pigments, and optionally one or more organic solvents, neutralizing agents and customary lacquer additives, as binder a combination of:I) 99.5 to 85 wt % of one or more aqueous, physically drying polyurethane binders andII) 0.5 to 15 wt % of one or more polyisocyanates, liquid at room temperature or liquefied by organic solvents, with more than one free isocyanate groupswherein the wt % of components I) and II) both relate to their solids content and add up to 100 wt % and wherein component II) is added to the coating agent shortly before its application.

Abstract: A process and device for the preparation of coatings on wires or fiber-like materials by mixing one or more polymers which contain carboxyl and/or amide groups (A) and with at least two carboxyl and/or amide groups, a hydroxyl number of less than 130 and a number average molecular weight of 200 to 5000, in the liquid state, with one or more polyisocyanates (B) with at least two free isocyanate groups in the molecule and a number average molecular weight of 200 to 3000, in the liquid state, and optionally one or more other components (C) which are normally present in lacquers, in the liquid state, continuously immediately before application in a ratio such that 0.5 to 5.0 isocyanate groups are allotted to each carboxyl group or that 0.02 to 2.

Abstract: Aqueous two-component coating agents contain 7.5 to 25 wt. % of at least one epoxide resin in the form of a dispersion, with respect to the resin solids, 1.5 to 15 wt. % of at least one water-miscible polyamine, 2 to 15 wt. % of at least one chlorinated polyolefin with a degree of chlorination of 15 to 40 wt. %, 0 to less than 5 wt. % of one or more organic solvents, 35 to 85 wt. % of water, and conventional lacquer additives, pigments and fillers. The coating agents are suitable for use in processes for coating plastic substrates, in particular polyolefin substrates.

Abstract: A process is described for recovering the overspray of aqueous coating agents during spray application in spray booths in which aqueous circulating liquid is circulated for the purpose of collecting the overspray. The overspray material is continuously or discontinuously extracted from the circulating liquid in an electrocoagulation bath, a higher concentration of overspray being maintained in the electrocoagulation bath than in the circulating liquid of the spray booth as a result of ultrafiltration.

Abstract: Improved aqueous binder dispersions including polyurethanes and water-based physically drying coating compositions containing these aqueous dispersions which are particularly suitable for plain and metallic colored base coats employed for automotive repair lacquer coatings.

Abstract: A coating agent with a viscosity of 100-1000 mPa.s, measured by rotational viscometry at 70.degree. C. and a shear rate of 235 s.sup.-1, containing45-85 wt % of one or more polyesters, that have a branched structure and are essentially free from aromatic structural units, with a number-average molecular weight (M.sub.n) of 350-3000 and a polydispersity of less than 3.5,10-40 wt % of one or more cross-linkers based on aminoplastic resins and/or blocked di- and/or polyisocyanates,0-20 wt % of one or more reactive diluents, and 0-10 wt % of one or more organic solvents.They are particularly suitable as hot-sprayable clear coats for multicoat lacquer finishes.

Abstract: Process for producing a multi-layer lacquer coating of a substrate, in particular of automobiles or their parts, in which for the layer of primer surfacer (filler) a coating agent is used which is based on one or several cationic binding agents. Low stoving temperatures and corrosion protection are achieved.

Abstract: A drying nozzle is comprised of a tube for mounting on a nozzle head of a spray gun. The body contains inlet slits for ambient air entering one tube end which taper in a direction of the interior of the tube. The body expands toward the other tube end. Upon mounting the body on the nozzle head the narrowest region of the tube between the tapering region of the inlet slits and the expanding region of the tube lies directly behind an air outlet opening when seen in direction of flow of the air passing out of the air outlet opening of the nozzle head. Upon supplying compressed air in the center of the tubular body a negative pressure in the tube interior is produced and as a result of which ambient air is drawn into one tube end and passes out at the other tube end together with the compressed air.

Abstract: Process for manufacturing stopping compounds, in particular such as can be used for motor vehicle repair lacquering, in which in a first stage at least 90 wt.-% of the solvents required and 80 to 100 wt.-% of the binding agents required are dispersed together with such a proportion of the pigments and/or extenders as is required in order to ensure that the mixture can be dispersed in a high-speed agitator mill, as well as optionally together with the required additives in a high-speed agitator mill, in particular a bead mill or sand mill, whereupon the dispersed material produced is, in a second stage, mixed with the remaining amounts of pigment and/or extender as well as optionally the remaining amounts of binding agent and solvent and dispersed in a dissolver to the required fineness.

Abstract: Process for the production of multi-layer lacquer coatings by electrophoretic deposition of a first coating layer of a first, aqueous coating composition onto an electrically conductive substrate, application of a second coating layer based on a second, powder coating composition and joint baking of the coating layers so obtained, which process is characterised in that a powder coating composition is used for the second coating layer which is based on binders which contain no diene-based polymer units, wherein the coating composition is selected such that the minimum baking temperature range of the second coating layer is above that of the first coating layer or overlaps with this range in such a manner that the lower limit of the range of the second coating layer is above the lower limit of the range of the first coating layer.

Abstract: Process for producing a multi-layer lacquer coating by the application of a coat of clear lacquer including coating agents which are curable exclusively by polymerization in radicalic and/or cationic manner to a dried or crosslinked colored and/or effect-producing basecoat film process is performed in light having a wavelength of over 550 nm or subject to the exclusion of light. The application step is followed by initiation or implementation of curing of the clear-lacquer film by high-energy radiation. The process is particularly suitable for producing multi-layer lacquer coatings in the automobile industry.

Abstract: Process for fixing wound items made from electrically conductive materials by impregnation with radically polymerisable compositions and thermal curing characterised in that the wound items are impregnated by immersion impregnation, flow coating, vacuum impregnation, vacuum pressure impregnation or trickle impregnation and that simultaneously with or after thermal curing the wound articles are cured by high-energy radiation. The process operates with low energy requirements and low emissions of volatile substances. Radically curable compositions are also described.

Abstract: A binding-agent composition for coating agents which can be cured at low temperature contains:A. 4-72% by weight of an acidic CH-compound, obtained by transesterification of an aliphatic .beta.-ketocarboxylic acid ester with one or several monomers and/or polymers containing hydroxyl groups and which contain at least two hydroxyl groups in the molecule,B. 4-72% by weight of an .alpha.,.beta.-unsaturated compound with at least two groups of the general formulaR.sub.1 R.sub.2 C.dbd.CR.sub.3 --CO--attached via the residue of a divalent or polyvalent alcohol, a diamine or polyamine or amino alcohol to at least one additional R.sub.1 R.sub.2 C.dbd.CR.sub.3 --CO--group, where R.sub.1, R.sub.2 and R.sub.3 independently of each other are a hydrogen atom or a straight or branched alkyl residue with 1 to 10 carbon atoms,C. 10-80% by weight of one or several polyamines with, by way of curing agents, at least two amine functions, which can be primary and/or secondary and can be blocked, in the molecule, andD. 0.

Abstract: A binding-agent composition for solvent-based or aqueous coating agents can be cured at low temperature to produce coatings which are non-yellowing and resistant to solvents. The binding-agent composition contains binding-agent components based on polyethers, polyesters, polyether polyesters and/or (meth)acrylic copolymers with, in each case, at least one acryloyl group and at least one epoxide group in the molecule, whereby the acryloyl groups and epoxide groups are present in the ratio 2:8 to 8:2. Also included are several polyamines as curing agents in a proportion of equivalent weights ranging from 2:0.5 to 1:1.5. The binding agents are used in pigmented and pigment-free lacquers, for use particularly in multi-layer lacquering.

Abstract: An aqueous coating agent, containingone or more film-forming water-dilutable or water-soluble epoxy resins with an epoxide equivalent weight of 100 to 10000,one or more water-dilutable or water-soluble polyamines with at least two primary and/or secondary amino groups in the molecule and an equivalent weight of 50 to 500, andoptional pigments, fillers and/or other conventional lacquer adjuvants,the ratio of reactive H atoms in the polyamines to the epoxy groups in the epoxy resins being 0.7:1 to 1.5:1 and5 to 80 wt. % of one or more water-dilutable or water-soluble polyurethane resins with a number average molecular weight (Mn) of 500 to 500000 relative to the sum of the weights of the solids in the epoxy resin and polyamine.

Abstract: A catalyst-free single-component coating agent containing (A) one or more compounds acting as cross-linking agents and with on average at least two CH-azide hydrogen atoms, (B) one or more (meth)acrylate copolymers, polyester resins and/or polyurethane resins capable of Michael addition, with .alpha., .beta.-unsaturated groups bonded via carbonyl, carboxyl and/or carboxylic amide groups, a C.dbd.C equivalent weight of 85-1800 and a weight average molecular weight of 170-50000. The equivalent ratio of A to B is 2:1 to 1:2. The coating agent contains solvents and conventional lacquer additives, and optionally contains water, pigments and/or fillers. It results in particularly acid-resistant coatings and is particularly suitable for producing covering lacquer and clear lacquer coatings in the motor-vehicle sector.