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AssigneeBASF SE
InventorsHarro Petersen, Kurt Fischer, Hans Klug, Werner Trimborn, Horst Schmidt
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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.
A process for the preparation of soft and hard resins from an urea, formaldehyde and a CH-acidic aldehyde, by reacting an urea of formula (I) or (II). ##STR8## where R.sup.1 and R.sup.2 are hydrogen or identical or different alkyl of 1 to 18 carbon atoms, A is alkylene of 1 to 6 carbon atoms and X is oxygen or sulfur, with formaldehyde and a CH-acidic aldehyde of formula (III). ##STR9## where R.sup.3 and R.sup.4 are identical or different alkyl, aryl or alkylaryl, the urea, formaldehyde and CH-acidic aldehyde being employed in a molar ratio of from 1:2:2 to 1:4:4, at from 60.degree. to 150.degree. C., in the presence of an acid, wherein the product is then after treated with an alkali metal alcoholate in an anhydrous medium.
Dependencies are inferred from the claim text.