| A kind of water soluble polyester(WSP) was synthesized by ester exchange-esterification-polycondensation. It can be four components copolymer including Dimethylterephthalate(DMT), 1,2~propanediol(PDO), dimethyl 5-sulfoisophthalate sodium salt(SIPM) and diethylene glycol(DEG). The effect of the ratio of reactant, the reaction time, the catalyst and the reaction temperature to the chemical structure of WSP were researched in experiments.The copolymers were analyzed by Fourier-Transform Infrared spectroscopy (FT-IR), 1H Nuclear Magnetiic Resonance spectroscopy(1H NMR). At the same time, noncrystalline polymer was found by X-diffraction because of the addition of SIPM and PDO. The WSP molecular weight is about 6000 by Gel Permeation Chromatography(GPC). Experimentally it is found that increasing the temperature and the time decrease the average molecular weight. The reason is that with the temperature increasing, SIPM and DEG will promote polyester cracking.The water soluble polyester solvent and the property of dissolving are discussed. Dimethyl 5-sulfoisophthalate sodium salt(SIPM) is added to the polyester, giving water-dispersible products. Changing the mole fraction and the water-sensitivity is changed. It was found that, with the increase of SIPM chain element, the solublility of water-soluble polyesters in water and limited concentration of added salt NaCl in aqueous solutions of water-soluble polyesters are increased. 15% SIPM copolying with dibasic alcohol and dicarboxylic acid can give better-dispersible polyester. As a kind of polymeric surfactant, the surface physical properties of WSP wereexamined.The viscosity, the surface physical properties, the rheological behavior and the solubilization to pigment of the water soluble polyester solvent were researched. The water soluble polyesters is soluble in some organic solvents, but sometimes show obvious different solubility in same solvent of different samples.
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