US 5,401,782 AGranted

Cationic pigment grinding resin for electrodeposition paint and production thereof

AssigneeNippon Paint Co., Ltd.

InventorsIchiro Kawakami, Hiroyuki Kageyama, Hiroyuki Nojiri

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Abstract

Disclosed is a cationic resin which can produce a pigment paste having high dispersion stability, an electrodeposition paint with good storage stability and a coated film with preferred corrosion resistance. The cationic pigment grinding resin for electrodeposition paint obtained by reacting a) a hydrophobic epoxy resin obtained by reaction of a bisphenol A type epoxy resin with a half-blocked isocyanate; with b) sulfide; which contains a group having specific chemical formula in one molecule, in which said bisphenol A type epoxy resin has an epoxy equivalent of 180 to 1,000, said hydrophobic epoxy resin has a solubility parameter of 10.0 to 11.0 and a conversion rate to tertiary sulfonium is 70 to 90%.

Claims14

Dependent claims

A cationic pigment grinding resin for electrodeposition paint obtained by reacting a) a hydrophobic epoxy resin obtained by reaction of a bisphenol A epoxy resin with a half-blocked isocyanate;

with b) sulfide;
which contains, in one molecule, at least one group represented by the formula, ##STR2##
wherein R.sub.1 stands for an alkyl or an alkanol group having C.sub.2 to C.sub.12, X stands for a residue of an organic acid or inorganic acid, R.sub.3 stands for an aliphatic, alicyclic or aromatic alkylene group and R.sub.4 stands for an alkyl group or alkyl ether group of C.sub.4 to C.sub.20,
in which said bisphenol A epoxy resin has an epoxy equivalent of 180 to 1,000, said hydrophobic epoxy resin has a solubility parameter of 10.0 to 11.0 and the conversion ratio to tertiary sulfonium is 70 to 90%.

1 more element

Dependencies are inferred from the claim text.