US 4,167,395 AGranted

Water-soluble branched polyesters

AssigneeCassella Aktiengesellschaft

InventorsFriedrich Engelhardt, Karl Hintermeier, Joachim Ribka, Helmut Beutler

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Abstract

Water-soluble polyester having an apparent molecular weight between about 600 and about 5,000 and a SO.sub.3 M group content between about 5 to about 40 mol percent based on the number of mols of dicarboxylic and/or polycarboxylic acids esterified in the polyester, and an at least trifunctional alcohol and/or an at least trifunctional carboxylic acid content between about 1 to about 40 mol percent based on the number of mols of dicarboxylic and/or polycarboxylic acids esterified in the polyester so that the polyester is correspondingly branched and M denotes a cation of an alkali metal, the ammonium ion or the cationic radical of an organic amine. The improved polyester is particularly suited as a levelling agent in the disperse dyeing of polyester fibers or the like.

Claims11

Dependent claims

A water-soluble polyester having an apparent molecular weight of from about 600 to about 5,000 which is the esterification reaction product of

(a) dicarboxylic acid;
(b) diol comprising at least 40 mole percent of diethylene glycol, triethylene glycol or a mixture thereof based on the total --OH reactant;
and
(c) a branching component selected from the group consisting of polycarboxylic acid having 3 to 5 carboxyls, polyol having 3 to 5 hydroxyls and hydroxycarboxylic acid having at least one carboxyl and at least one hydroxyl and having a total of carboxyl and hydroxyl of 3 to 5 in an amount sufficient to produce a polyester having 5 to 40 mole percent branching component;
with the proviso that the polyester also contains 5 to 40 mole percent of --SO.sub.3 M based on the molar amount of total esterified carboxylic acid and wherein M is a cation of an alkali metal, an organic amine or ammonium.

2 more elements

Dependencies are inferred from the claim text.