US 4,579,932 A · Novel cationic epoxy resin esters and process of producing same

Abstract

Cationic epoxy resin esters suitable as binders for stoving coating compositions, particularly for application by electrodeposition, and as mill base resins for grinding pigments and extenders; and a process for producing same is described. The resin esters are produced through reaction of a resinous compound carrying at least two 1,2-epoxy groups with carboxylic acids and, optionally, with primary and/or secondary alkyl- and/or alkanolamines. The carboxylic acid employed, totally or partially, is the reaction product of a dicarboxylic acid anhydride and a tertiary amine which has the structure - ##STR1## wherein R and R.sub.x are a hydrogen atom or an alkyl radical or an aryl radical which may be substituted, R.sub.7 is an alkyl radical, an amino-alkyl radical having the primary amino groups, if present, blocked (as a ketimine) or the moiety remaining after the reaction with an active hydrogen atom of an acrylic or methacrylic monomer monofunctional with regard to the double bond, and wherein n is 2 or 3, the quantity of basic component being chosen in order that the epoxy-free final product has an amine value of at least 35, and preferably of from 40 to 140 mg KOH/g.

Claims10

Dependent claims

Cationic epoxy resin esters obtained by the reaction of a compound carrying at least two 1,2-epoxy groups with a carboxylic acid, said carboxylic acid being the reaction product of a dicarboxylic acid anhydride and a tertiary amine, said amine having the structure- ##STR12## wherein R and R.sub.x are a hydrogen atom;

an alkyl radical or an aryl radical and n is 2 or 3, and R.sub.y is an alkyl radical, an amino-alkyl radical having the primary amino groups, if present, being in the form of ketimine blocked amino groups, and said tertiary amine being obtained through ring formation with an aldehyde, water being split off, from at least one member of the group-
(a) an N-substituted ethanolamine or N-substituted propanolamine;
(b) primary .beta.-hydroxyethylamines or .beta.-hydroxypropylamines or .gamma.-hydroxyethylamines or .gamma.-hydroxypropylamines, or a substituted derivative of said amines, after blocking the primary amino group as a ketimine or through reaction with acrylate monomers, and
(c) reaction product of a primary alkyl amine with a monoepoxy compound;
the quantity of tertiary amine being such that the epoxy resin ester is at least substantially free of epoxy groups and has an amine value of at least 35 mg KOH/g.

2 more elements

Dependencies are inferred from the claim text.

Novel cationic epoxy resin esters and process of producing same

Life of this patent

Novel cationic epoxy resin esters and process of producing same

Life of this patent

Abstract

Claims10