| 摘要 |
<p>A process for preparing a cathodic electrodepositable coating composition which comprises, in sequence, (i) epoxidizing a high-molecular-weight compound containing a carboncarbon double bond and having a molecular weight of 500 to 10,000 and an iodine value of 100 to 500 to form an epoxidized high-molecular-weight compound containing 0.5 to 12% by weight of oxirane oxygen, (ii) reacting a part of the epoxy groups of the epoxidized highmolecular-weight compound with a basic amine compound of the general formula wherein R1 and R2, independently from each other, represent a hydrocarbon group having 1 to 10 carbon atoms which may be partly replaced by a hydroxyl group, and R1 and R2 together may form a cyclic structure, (iii) reacting a part or the whole of the remaining epoxy groups with an .alpha.,.beta.-unsaturated monocarboxylic acid of the general formula wherein R3 and R4 represent a hydrogen atom or a methyl group, at least one of them being a hydrogen atom, to prepare a resin composition, and (iv) neutralizing the resin composition with an organic or inorganic acid to render it water-soluble or water-dispersible.</p> |
