| abstract |
To provide polyester resins with self-emulsifying function that can form water-based emulsions without using emulsifiers and organic solvents, water dispersions containing them, water-based adhesives and water-based inks, and laminates formed therefrom, packaging materials and water dispersions Manufacturing method. A polyester resin having an acid value of 250 to 2,500 eq/10 6 g and a number average molecular weight of 2,000 to 50,000 as represented by the chemical structure of the following general formula (1). (X‑O) r ‑W‑(O‑(CO‑Z‑CO‑O‑Y‑O) p ‑X) q (1) Wherein, W is a (q+r) valent organic group , (CO-Z-CO-O-Y-O) is a polyester resin skeleton with polycarboxylic acid component Z and polyol component Y as polymer components, X is the residue or hydrogen of a polybasic acid with more than 2 carboxyl groups (wherein, (q+r) X's are not all hydrogens). Each of X, Y and Z may be the same or different, and may be the same or different within the same repeating unit. The average value of p is 3 or more, the average value of q is more than 0 and 15 or less, the average value of r is 0 or more and less than 15, and (q+r) is 3 or more and 15 or less. |