Basf Aktiengesellschaft

Horst Schmidt

Harro Petersen

Wolfram Weiss

Erich Beck

Kurt Fischer

Eberhard Schupp

Fritz E Kempter

Hans Renz

Edmund Keil

Adolf Nuber

Gerd Busse

Hellmuth Kasch

Werner Trimborn

Reinhard Lang

Gunther Sabelus

Hans Klug

Gunther Immel

Radiation-curable binders which are obtained by reacting A) an amine/formaldehyde condensate having a molar ratio of formaldehyde to amino groups of from 1:1 to 2:1 with

Radiation-curable binders

Radiation-curable catalysts are obtainable by reacting

Radiation-curable acrylates

Urea-aldehyde polycondensates usable as surface coating binders are obtainable by step-wise reaction of

Urea-aldehyde polycondensates, preparation thereof and use thereof as

The heat-curable coating agent according to the invention contains a combination of a binder, which possesses basic nitrogen groups and is rendered water-dilutable by protonation with an acid, and a crosslinking agent and, if required, pigments, fillers, corrosion inhibitors, surface coating assistants and catalysts, and the binder used is a reaction product of a dicarboxylic acid or of a dicarboxylate or of a (meth)acrylate oligomer or polymer with an adduct of a di- or triglycidyl ether and a polyamine, the polyamine containing 2 or more amine nitrogen atoms per molecule and one or more alkylene chains of 3 or more carbon atoms between the amino groups, and has an NH amine number of from 50 to 150 mg of KOH/g and is combined with aminoplasts and/or phenoplasts as crosslinking agents. The novel coating agent is useful as a binder for the cathodic electrocoating of metal articles.

Heat-curable coating agent and its use

A process for the preparation of curable etherified aminoplast resins based on urea/aldehyde polycondensates, and the preparation of surface coating resins. Urea is first reacted with an .alpha.,.alpha.-dialkylaldehyde, as much as 50 mol % of which may be replaced by formaldehyde, in a molar ratio urea/aldehyde of about 1:2, at from 50.degree. to 120.degree. C., in the presence of an acid and in the presence or absence of an alcohol or of other organic solvents, and the 2-oxohexahydropyrimidine derivative obtained in this cyclocondensation is then condensed with formaldehyde in the presence of one or more alcohols and an acid. These aminoplast resins are useful as both acid-curable resins and as resins for baking finishes.

Preparation of curable etherified aminoplast resins and of surface

A process for the preparation of soft and hard resins, and their use in surface-coating binders are disclosed. According to the invention, soft and hard resins are prepared from a urea, formaldehyde and a CH-acidic aldehyde by reacting a urea of the general formula (I) or (II) ##STR1## where R.sup.1 and R.sup.2 are hydrogen or identical or different alkyl, A is alkylene and X is oxygen or sulfur, with formaldehyde and a CH-acidic aldehyde of the general formula (III) ##STR2## where R.sup.3 and R.sup.4 are identical or different alkyl, aryl or alkylaryl wherein the urea, formaldehyde and CH-acidic aldehyde are employed in a mole ratio of from 1:2:2 to 1:4:4, at from 60.degree. to 150.degree. C., in the presence of an acid and in the presence or absence of a solvent and/or diluent, and then treating the product with a base in an anhydrousmedium.

Process for the manufacture of soft and hard resins of urea,

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Mannheim, Germany

Horst Schmidt