Patent ID: 8574466

Claim:
A modified polyamine produced by a reaction of: (i) a polyamine containing 2 to 1800 primary and/or secondary amino groups per molecule; (ii) a polyester; and (iii) a phosphorus-containing compound selected from the group consisting of a compound represented by the formula (1), a tautomer thereof, a metal salt thereof, and an amine salt thereof: wherein R 1 and R 2 each independently represent hydrogen, a hydroxy group, a cyano group, or —O—R 3 , and R 3 represents a hydrocarbon group having 1 to 24 carbon atoms, wherein the polyamine and the phosphorous-containing compound form a salt through a free amino group of the polyamine and a hydroxyl group of the phosphorous-containing compound, and an amount of the phosphorus-containing compound is from 0.004 to 0.7 mol/a number of moles of amino groups with respect to the number of moles of the primary and/or secondary amino groups of the polyamine.