Abstract: Epoxy resin compositions comprising polyepoxides having at least two 1,2-epoxide groups, which can be obtained by reaction of diepoxides or polyepoxides or mixtures thereof with monoepoxides, and one or more amines sterically hindered amines, such as disecondary polyoxyalkylenediamines, and/or diprimary diamines, if desired with the addition of further 1,2-epoxide compounds and also hardeners, and use thereof as a coating for crack bridging, as an adhesive and in powder surface coatings.

Abstract: Epoxy resin compositions containing polyepoxides having at least two 1,2-epoxide groups are disclosed. The polyepoxides can be obtained by reacting (i) di- or polyepoxides or mixtures thereof with monoepoxides, (ii) one or more amines chosen from sterically hindered amines, disecondary diamines and diprimary diamines to form an epoxide-amine adduct, and (iii) subsequently reacting the epoxide-amine adduct with polyfunctional isocyanates. The composition also contains curing agents for the polyepoxides and can optionally contain additional 1,2-epoxide compounds and additives. The compositions are useful as coatings for bridging cracks, as adhesives and as constituents of paints.

Abstract: An emulsifier composition for water-dilutable epoxy resins comprise condensation products of an aliphatic polyol component having a weight-average molar mass (M.sub.w) of from 200 to 20,000 g/mol, where a mass fraction of at least 5%, has a weight-average molar mass (M.sub.w) of at least 4000 g/mol, and an epoxide component having of at least one epoxide compound having at least two epoxide groups per molecule and an epoxide group content of from 500 to 10,000 mmol/kg, the ratio of the number of hydroxyl groups to that of the epoxide groups (OH):(EP) being from 1:3.51 to 1:10. When the emulsifier is used for the preparation of aqueous epoxy resin systems, the end of the pot life is indicated by a sharp rise in viscosity.

Abstract: Aqueous, low-solvent coating compositions comprising a base resin dispersion comprising of an epoxy resin, prepared by condensation of one or more epoxide compounds having at least two epoxide groups per molecule and an aromatic polyol; a dispersant comprising a condensation product of an aliphatic polyol having a weight-average molar mass (M.sub.w) of from 200 to 20,000 g/mol and an epoxide compound having at least two epoxide groups per molecule, and low molar mass, liquid, epoxy-functional compounds as diluents, and also water; an aqueous curing agent for the modified epoxy resin (I), which is suitable for curing at room temperature or at elevated temperatures (forced drying), components (I) and (II) being employed in mass fractions such that the ratio of the number of reactive epoxide groups in (I) to the number of amine hydrogen atoms in (II) is between 1:0.75 and 1:2. The coating compositions exhibit an extended pot life. They can be used to produce coatings and in water-soluble adhesives.

Abstract: A selif-emulsifying epoxy resin (A), prepared from proportions by mass of(A-1) from 50 to 95% of one or more epoxide compounds having at least two epoxide groups per molecule and an epoxide group content of from 300 to 11,200 mmol/kg;(A-2) from 5 to 50% of an aromatic polyol;(A-3) from 0 to 25% of modifying compounds having at least two epoxide-reactive groups;(A-4) from 5 to 25% of an emulsifying product of the condensation of(A-4-a) an aliphatic polyol having a weight-average molar mass M.sub.W of from 200 to 20,000 g/mol and(A-4-b) an epoxide compound having at least two epoxide groups per molecule and an epoxide group content of from 500 to 10,000 mmol/kg,whereby the ratio of the number of OH groups to the number of EP groups is from 1:2 to 1:10 and the epoxide group content of these condensation products (A-4) is between 100 and 6700 mmol/kg.

Abstract: A curing component (A) containing amino groups available for reaction with epoxy resins (B), wherein the curing component (A) is a condensation product of di- or polyhydroxyaromatics (A1) with polyamines (A2) is disclosed. The curing component (A) is useful in preparing curing mixtures (C) which include the curing component (A) and at least one epoxy resin (B), whereby the curing mixtures are useful in the production of shaped articles and as coatings.

Abstract: Hardeners for elastic epoxy resin systems, obtained by reaction of(A) reaction products of epoxide compounds (A1) with sterically hindered amines (A3), and/or(B) cyclic carbonates prepared from the compounds (A) and carbon dioxide, and/or(C) cyclic carbonates prepared from reaction products(C1) of epoxide compounds (C11) with polyoxyalkyleneamines (C13) and carbon dioxide, and, if desired(D) additional epoxide compounds or unreacted residues of the initial epoxides for the preparation of (A), (B) and (C), with(E) polyamines having at least two secondary amino groups, and(F) if desired, further reactants, each of the epoxide compounds (A1) and (C11) containing at least two epoxide groups, and it being possible for monoepoxides to be admixed in each case, if desired.

Abstract: Aqueous low-solvent coating compositions comprising a modified epoxy resin dispersion comprising an epoxy resin which is prepared by condensation of one or more epoxide compounds having at least two epoxide groups per molecule with an aromatic polyol; a dispersant comprising a condensation product of an aliphatic polyol and an epoxide compound having at least two epoxide groups per molecule; a diluent consisting of ethylenically unsaturated otherwise inert or, if desired, functional monomers capable of free-radical polymerization or copolymerization, and water, and also an aqueous curing agent for the modified epoxy resin (I), which is suitable for curing at room temperature or at elevated temperatures (forced drying), components (I) and (II) being employed in proportions by mass such that the ratio of the number of epoxide groups which are capable of reaction to the number of amine hydrogen atoms is between 1:0.75 and 1:2. The coating compositions can be employed to produce matt coatings and in adhesives.

Abstract: Curing agents for aqueous epoxy resin dispersions obtained by reaction of an adduct (A) of at least one polyepoxide (A.sub.1) and at least one polyalkylene polyether polyol (A.sub.2), it being possible for the adduct (A) to be modified with a secondary amine (A.sub.3) if appropriate, withI. a reaction product of an amine (B) and an epoxide (C)orII. an amine (B) and subsequent reaction with an epoxide (C),the amount of amine (B) being chosen such that the H atoms on the nitrogen are present in a 2- to 10-fold excess, based on the epoxide groups in (A).

Abstract: Curing components containing amino groups for curing epoxy resins are obtained by the reaction of alkylated polyhydroxy aromatics (A) with polyamines (B) and aldehydes (C) by the mechanism of the Mannich reaction. The preparation of curable mixtures and varnish formulations is also disclosed. The curing components and curable mixtures can also be employed at a low temperature.

Abstract: Curing components containing amino groups for curing epoxy resins are obtained by the reaction of alkylated polyhydroxy aromatics (A) with polyamines (B) and aldehydes (C) by the mechanism of the Mannich reaction. The preparation of curable mixtures and varnish formulations is also disclosed. The curing components and curable mixtures can also be employed at a low temperature.

Abstract: Curing agents for aqueous epoxy resin dispersions obtained by reaction of an adduct (A) of at least one polyepoxide (A.sub.1) and at least one polyalkylene polyether polyol (A.sub.2), it being possible for the adduct (A) to be modified with a secondary amine (A.sub.3) if appropriate, withI. a reaction product of an amine (B) and an epoxide (C)orII. an amine (B) and subsequent reaction with an epoxide (C),the amount of amine (B) being chosen such that the H atoms on the nitrogen are present in a 2- to 10-fold excess, based on the epoxide groups in (A).

Abstract: Polyol/epoxy adducts obtained by reaction of(A) an aliphatic polyol having an average molecular weight (Mw) of 200 to 2000 and(B) an epoxy compound having at least two epoxy groups per molecule and an epoxy equivalent weight of 100 to 2000,the equivalent ratio of the OH groups to the epoxy groups being 1:3.51 to 1:10, preferably 1:4 to 1:9, particularly preferably 1:45 to 1:8, and the epoxy equivalent weight of the adduct being between 150 g/eq and at least 800 g/eq, preferably between 250 g/eq and 1000 g/eq which adducts serve as nonionic emulsifiers in water-dilutable epoxy liquid resins.

Abstract: Hardeners for epoxy resins, comprising reaction products of(A) polyamidoamines that were obtained by polycondensation of (a) dicarboxylic acids containing oxyalkylene groups, or their derivatives, with (b) polyamines containing at least two amino groups capable of undergoing condensation with (a),(B) polyamines containing at least two secondary amino groups, and(C) adducts of (c) polyepoxy compounds and (d) polyalkylene polyether polyols.Epoxy resins that have been cured with these hardeners exhibit in particular a very good water resistance.

Abstract: A process for the preparation of aqueous epoxy resin dispersions comprising(1) 20 to 75% by weight, based on the total dispersion, of an epoxy resin constituting a condensation product ofa) epoxy compounds having at least one epoxy group per molecule and an epoxide equivalent weight of 90 to 3000 g/mol, andb) aromatic polyols;(2) 3 to 20% by weight, based on the total dispersion, of an emulsifier comprisinga) a condensation product of an aliphatic polyol and an epoxy compound having at least two epoxy groups per molecule and an epoxide equivalent weight of 90 to 3000 g/mol, the equivalent ratio of the OH groups to the epoxy groups being 1:0.85 to 1:1.

Abstract: Process for enhancing the electrostatic chargeability of powder coatings or powders, and the use thereof for surface-coating solid objects.A process for enhancing the electrostatic chargeability of powder coatings or powders intended for surface-coating solid objects, by homogeneously incorporating at least one triarylmethane, azine, thazine and/or oxazine compound in an amount from about 0.01 to about 10 percent by weight into powder coatings or powders, the compounds mentioned being dissolved or dispersed in the powder coating system or powders.

Abstract: Process for enhancing the electrostatic chargeability of powder coatings or powders, and the use thereof for surface coating solid objects.Process for enhancing the electrostatic chargeability of powder coatings or powders intended for the surface-coating of solid objects, by homogeneously incorporating at least one salt-like, cationic compound of the formula (1) ##STR1## in which R.sub.1, R.sub.2, R.sub.3 and R.sub.4, independently of one another, denote hydrogen atoms, straight-chain or branched alkyl groups having 1 to 30 carbon atoms, mononuclear or polynuclear cycloaliphatic radicals having 5 to 12 carbon atoms, oxethyl groups of the general formula --(CH.sub.2 --CH.sub.2 --O).sub.n --R in which n denotes a number from 1 to 10 and R denotes a hydrogen atom, a (C.sub.1 -C.sub.

Abstract: Use of polyamidoamines as curing agents for epoxy resins and curable mixtures containing these substances.The invention relates to the use of polyamidoamines (A) containing primary and/or secondary amino groups as curing agents for epoxy-containing compounds (B), wherein the polyamidoamines (A) used are those compounds which have been obtained by polycondensation of (a) compounds from the group of dicarboxylic acids containing oxyalkylene groups, or derivatives thereof (esters), with (b) polyamines containing at least two amino groups which are condensable with (a).The invention furthermore relates to curable mixtures containing the abovementioned components (A) and (B). The cured products obtainable according to the invention have advantages with regard to impact strength and shock resistance, to flexibility even at relatively low temperatures and crack-bridging properties.

Abstract: A process for enhancing the electrostatic chargeability of powder coatings or powders intended for surface-coating solid objects, by homogeneously incorporating at least one salt-like, cationic compound of the formulae (1) and/or (2) ##STR1## in which R.sub.1, R.sub.2, R.sub.3 and R.sub.4, independently of one another, are hydrogen atoms, straight-chain or branched alkyl groups having 1 to 30 carbon atoms, oxethyl groups of the formula --(CH.sub.2 --CH.sub.2 --O).sub.n --R in which R is a hydrogen atom or a (C.sub.1 -C.sub.4)alkyl or acyl group, and n is a number from 1 to 10, mononuclear or polynuclear cycloaliphatic radicals having 5 to 12 carbon atoms, mononuclear or polynuclear aromatic radicals or araliphatic radicals, R.sub.5 denotes a hydrogen, fluorine, chlorine or bromine atom or a (C.sub.1 -C.sub.6)alkoxy or primary amino group, and where R.sub.1 and R.sub.3 may be part of a ring system having 5 to 7 atoms and 0 to 3 double bonds, and A.sup.

Abstract: The invention relates to curable powder mixtures comprising(A) carboxyl-containing polyesters,(B) compounds containing at least two 1,2-epoxide groups, which compounds are reaction products of(B1) compounds containing at least two 1,2-epoxide groups per molecule and having an epoxide equivalent weight of 160 to 600 and(B2) aromatic dicarboxylic acids or mixtures thereof with compounds selected from the group (cyclo)aliphatic dicarboxylic acids, monocarboxylic acids and/or monohydric phenols, and(B3) cyclic anhydrides, if required, and(C) any customary additives, if appropriate.These mixtures are distinguished in particular by an improved resistance to yellowing and/or increased reactivity.