Hoechst Aktiengesellschaft

Vianova Kunstharz A.g.

Helmut Plum

Gerhard Brindopke

Uwe Kubillus

Hannes Fischer

Willibald Paar

Gerd Walz

Dietrich Saatweber

Gerhard Brindoepke

Jurgen Ritz

Michael Honel

Georg Hendriux

Liquid coating agent based on a polymer containing acetoacetate groups and a polyamine in the form of the corresponding aldimine or ketimine, the polymer containing acetoacetate groups being obtained by reaction of a polyepoxide with water, an amine or a hydroxycarboxylic acid and subsequent esterification or transesterification with acetoacetic acid. These liquid coating agents are particularly suitable as binders in two-component automobile repair fillers or as two-component primers.

Liquid coating agent based on transesterified, modified epoxy resins and

The invention relates to a curing component (A) containing active CH groups, which contains at least two groups of the formula (I) ##STR1## or structural units of the formula (I') or (I') ##STR2## in which: A denotes ##STR3## X and Y are identical or different and denote ##STR4## CO.sub.2 R.sup.1, CN, NO.sub.2, CONH.sub.2, CONR.sup.1 H or CONR.sup.1 R.sup.1, where the R.sup.1 radicals may be identical or different and represent a hydrocarbon radical, preferably an alkyl radical having 1 to 12 carbon atoms, which may also be interrupted by oxygen or an N-alkyl radical, with the proviso that only one of the two radicals X and Y may represent the NO.sub.2 group;

Curing component, and the use thereof

Products of the reaction of (a) a polyisocyanate, (b) a CH-active alkyl ester, (c) a polyoxyalkyleneamine and (d) if appropriate a further NH- and/or OH-reactive compound as the curing component for binders (B) which contain groups which are capable of amide and/or ester formation. Mixtures of (A) and (B), and where appropriate diluents (C) and additives (D), have a long shelf life, even in aqueous systems, and are particularly suitable for aqueous paint formulations.

Curing component for synthetic resins, curable mixtures containing same,

An aqueous electrophoretic coating material, which can be deposited at the cathode and contains

Aqueous electrophoretic enamel coating materials, which can be deposited

Electrodepositable stable coating preparation essentially comprising a synthetic resin (A), which contains amino groups and, if appropriate, hydroxyl groups, a hardener (B) which is capable of transesterification and/or transamidation, water as diluent (C), if appropriate, organic solvents (D), and also the conventional coating additives and, if appropriate, hardening catalysts (E), wherein the organic solvents content is a maximum of 10% by weight, relative to the solids content. The invention furthermore relates to a process for the preparation of this coating preparation, which is distinguished by a low organic solvents content with good storage stability.

Electrodepositable preparations having low organic solvent content, and

Self-crosslinking cationic paint binders in which the crosslinking is effected through the reaction of methane-carboxylic acid dialkylester monoamide structures with free hydroxyl or amino groups on the resin are described. The crosslinking functionality is provided by reaction of a polyisocyanate with a corresponding quantity of a CH-active alkyl ester. The alkyl ester is preferably a malonic acid dimethylester or malonic acid diethylester.

Self-crosslinking cationic paint binders and process for producing the

Hardeners are described for synthetic resins which contain groups which are capable of ester or amide formation and, if appropriate, polymerizable double bonds. The new hardeners, which allow lower crosslinking temperatures, are products (A) of the Michael addition of compounds (B), containing Michael addition-capable ester groups, to compounds (C) which contain at least two Michael addition-capable double bonds, the products (A) having an average of at least one polymerization-capable double bond and at least two transesterification- or transamidation-capable ester groups per molecule and the compound (B) representing products of the reaction of (b1) CH-active alkyl esters and (b2) polyisocyanates.

Hardening component for synthetic resins which contain groups which are

Crosslinking components for hydroxy and/or primary and/or secondary amino group containing paint binders for the crosslinking of synthetic resins carrying at least two groups capable of ester or amide formation with carboxylic acids. In particular there is disclosed the use of the crosslinking components in compositions for electrodeposition (ED) whereby at 120.degree. C. and above coatings with extraordinary paint performance are obtained. The use of methyl or ethyl esters gives extremely low condensation losses. The crosslinking components are obtained through reaction of one mole of a diisocyanate, preferably at room temperature, in the presence of sodium, or preferably sodium phenolate, as catalyst, with at least one mole of a CH-active alkyl ester of the general formula X--CH.sub.2 --COOR, wherein X is --COOR, --CN or CH.sub.3 --CO-- and R is an alkyl radical with 1 to 8 C-atoms and subsequent reaction of the free isocyanate groups with polyamines of the general formula H.sub.2 N--(R--NH).sub.n --R--NH.sub.2, wherein n is 0 to 3 and/or (poly)aminoalcohols of the formula N.sub.2 H--(R--NH).sub.n --R--OH, wherein n is 0 to 3, or HO-- (R--NH).sub.n --R--OH, wherein n is 1 to 3, and R is an alkylene radical in all cases.

Process for producing crosslinking components for paint binders and to

Process for preparing copolymers from esters of an unsaturated carboxylic acid with at least one other unsaturated monomer, characterized in that the following components are copolymerized in radical substance polymerization:

Process for preparing copolymers and use of the products obtained

Polymers that contain terminal amino groups and moieties of the formula (I) ##STR1## a process for preparing the polymers by (a) reacting in a first step a hydroxyl-containing ester of an .alpha.,.beta.-olefinically unsaturated monocarboxylic or dicarboxylic acid and a dihydric alcohol with a diisocyanate, the equivalence ratio of NCO to OH groups being greater than 1:1, (b) polymerizing the reaction product of (a) alone or in mixture with at least one olefinically unsaturated polymerizable monomer by free-radical polymerization, (c) decarboxylating the polymer into the ammonium salt, and then neutralizing the resulting product and their use in 2-component finishes that crosslink by means of crosslinking agents.

Polymers with primary amino groups their preparation and their use

Process for the manufacture of hardenable copolymers by the polymerization of unsaturated esters with unsaturated polymerizable monomers containing no free COOH groups, wherein an olefinically unsaturated diester containing OH groups is used as the unsaturated ester, said diester being obtained by reacting olefinically unsaturated dicarboxylic acids or the anhydrides thereof with a polyhydric alcohol and a monoepoxide compound in one or more steps, characterized in that the copolymerization of the diesters with monomers which contain no free COOH groups is carried out in the presence of copolymerizable monomers containing free COOH groups, and the use of the copolymers as hardenable binders for lacquers and/or coating compositions.

Process for the manufacture of hardenable copolymers and the use thereof

A process for the preparation of copolymers containing hydroxyl groups by radical reaction of

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Taunusstein, Germany

Helmut Plum