Aqueous polyester dispersion suitable for use as a coating composition

An aqueous dispersion comprising:

• (A) a polyester having about 0.45 to about 1.00 carboxyl groups per chain end, and comprising, as a polycarboxylic acid component, an aromatic dicarboxylic acid in a proportion of about 70% to about 100% by mole based on the entire acid component, a polyol having the formula I:
• ##STR3## wherein each of R.sup.1 and R.sup.2 is a hydrogen or a methyl, and each of m and n is a numeral greater than or equal to 1, provided that 2.ltoreq.(m+n).ltoreq.6, in a proportion of about 30% to about 95% by mole based on the entire polyol component, and at least one of a dicarboxylic acid containing a metal base of sulfonic acid in a proportion of about 0.01% to about 10% by mole based on the entire acid component, and a polyol containing a metal base of sulfonic acid in a proportion of about 0.01% to about 10% by mole based on the entire polyol component,
• (B) a water-soluble organic compound having a boiling point of about 60.degree. C. to about 250.degree. C.,
• (C) water, and
• (D) a neutralizer;
• wherein
• the amounts of the components (A), (B), (C), and (D) satisfy the following ratios (1) to (3):
• (1) A/B/C being about 1% to about 70% by weight/about 0% to about 69% by weight/about 9% to about 99% by weight,
• (2) B/(B+C) being about 0 to about 0.7 (weight ratio), and
• (3) the equivalent ratio of D to A being about 0.1 to about 20.