Hoechst Aktiengesellschaft

Vianova Resins, Inc.

Bernhard Stengel-Rutkowski

Claus Godau

Armin Pfeil

Joerg-Peter Geisler

Michael Hoenel

Dieter Dreischhoff

Manfred Marten

Matthias Wolfgang Meyer

Stefan Petri

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.

Epoxy and epoxy-polyacrylate dispersions containing reactive diluent

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.

Aqueous coating composition based on low-solvent modified epoxy resin

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, with I. a reaction product of an amine (B) and an epoxide (C) or II. 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).

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Wiesbaden, Germany

Bernhard Stengel-Rutkowski