Aqueous coating composition based on a cationic binder
AssigneeAkzo N.V.
InventorsChantal H. Guioth, Etienne G. Maze, Jean J. Trescol
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Abstract
A process is provided for coating an electrically conductive substrate with an aqueous coating composition containing a cationic binder wherein the binder is obtained by polymerization of 100 parts by weight of a specific monomer mixture in the presence of 1-20 parts by weight of an epoxy group-free adduct of a bisphenol bisglycidyl ether and an ethylenically unsaturated amido amine. The ethylenically unsaturated amido amine, in turn, is the product of a polyamine having 1-2 primary amino groups and 1-2 secondary amino groups and an ethylenically unsaturated monocarboxylic acid having 18-24 carbon atoms. The invention also pertains to the aqueous coating composition as such.
Claims15
An aqueous coating composition based on a cationic binder obtained by polymerization of 100 parts by weight of a monomer mixture in the presence of a polyethylenically unsaturated compound,
- said monomer mixture consisting of (a) 1-30% by weight of a hydroxy(cyclo)alkyl (meth)acrylate of which the (cyclo)alkyl group has 2-8 carbon atoms, (b) 4-45% by weight of an amino (meth)acrylate of the formula:
- ##STR3## wherein one of the groups R.sub.1 is a hydrocarbon group having 1-12 carbon atoms and the other group R.sub.1 is a hydrocarbon group having 1-12 carbon atoms or a hydrogen atom, or the two groups R.sub.1, together with the nitrogen atom attached thereto, form a heterocyclic group, R.sub.2 is a hydrocarbon group containing 2-12 carbon atoms and R.sub.3 is a hydrogen atom or a methyl group, (c) 0-80% by weight of a monovinyl aromatic hydrocarbon containing 8-14 carbon atoms, and (d) 0-50% by weight of a different monoethylenically unsaturated monomer containing 2-20 carbon atoms;
- said polyethylenically unsaturated compound being an epoxy group-free adduct of a bisphenol bisglycidyl ether and an ethylenically unsaturated amido amine formed from (a) a polyamine containing 1-2 primary amino groups and 1-2 secondary amino groups and (b) an ethylenically unsaturated monocarboxylic acid containing 18-24 carbon atoms, which adduct is present in an amount of 1-20 parts by weight per 100 parts by weight of the monomer mixture;
- amino groups present in said binder being at least partially neutralized with an acid.
Dependencies are inferred from the claim text.