Modified polyaspartic acids, their preparation and their use as dispersing agents and inhibitors of deposition in washing, rinsing and detergent compositions and in the treatment of water

摘要

Process for the preparation of modified polyaspartic acid or its salts, which comprises the following steps: (i) polycondensation of (a) 50 to 98 mol% aspartic acid, (b) 1 to 49 mol% of at least one compound that it has carboxyl groups, and (c) 1 to 30 mol% of a diamine or an amino alcohol, at a temperature of 100 to 270 ° C for between 1 minute and 50 hours, where (b) is not aspartic acid; (ii) subsequent hydrolysis of the co-condensate with the addition of a base; and (iii) optional acidification with mineral acids of the polyaspartic acid salt obtained in (ii), where the ratio of (b) :( c) is between 5: 1 and 1: 1.5.