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AssigneeVianova Kunstharz, A.G.
InventorsHelmut Plum, Willibald Paar
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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.
Crosslinking components for crosslinking paint binders containing reactive hydroxy or primary or secondary amino groups comprising the reaction product of a first processing step wherein 1 mole of a diisocyanate is reacted in the presence of 0.1 to 0.5% b.w., calculated on the total weight of the reaction mass, of a sodium catalyst, with at least 1 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 of from 1 to 8 C-atoms;
Dependencies are inferred from the claim text.