Self-crosslinking cationic paint binders and process for producing the binders
AssigneeVianova Kunstharz, A.G.
InventorsHelmut Plum, Michael Honel
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Abstract
Self-crosslinking cationic paint binders in which the crosslinking is effected through the reaction of methane-carboxylic acid dialkylester monoamide structures with free hydroxyl or amino groups on the resin are described. The crosslinking functionality is provided by reaction of a polyisocyanate with a corresponding quantity of a CH-active alkyl ester. The alkyl ester is preferably a malonic acid dimethylester or malonic acid diethylester.
Claims8
Process for producing self-crosslinking cationic paint binders water dilutable upon protonation with inorganic or organic acids, characterized in that a resin which is a polymer of the group consisting of polymers of olefinically unsaturated monomers containing as an ingredient esters of olefinically unsaturated carboxylic acid and hydroxyalkylacrylates or aminoalkylacrylates, of polyaminopolyamides and of aminopolyetherpolyols, carrying basic nitrogen groups and hydroxy or amino groups capable of transesterification or transamidation and isocyanate-reactive hydrogen atoms is reacted with a compound carrying at least one methanecarboxylic acid mono- or dialkylester monoamide group of the formula-- ##STR2## wherein X is --COOR, --CN or CH.sub.3 --CO--, and
- R is an alkyl radical with 1 to 8 C-atoms.
Self-crosslinking cationic paint binders water dilutable upon protonation with inorganic or organic acids comprising the reaction product of (a) a resin which is a polymer of the group consisting of polymers of olefinically unsaturated monomers containing as an ingredient esters of olefinically unsaturated carboxylic acid and hydroxyalkylacrylates or aminoalkylacrylates, of polyaminopolyamides and of aminopolyetherpolyols, carrying basic nitrogen groups and hydroxy or amino groups capable of transesterification or transamidation and isocyanate-reactive hydrogen atoms;
- and (b) a compound carrying at least one methanecarboxylic acid mono- or dialkylester monoamide group of the formula-- ##STR3## wherein X is --COOR, --CN or CH.sub.3 --CO--, and
- R is an alkyl radical with 1 to 8 C-atoms.
Dependencies are inferred from the claim text.