Patent ID: 6713598
Filing Date: 2004-03-30
Classification: C08G,C09K

Abstract:
A method for the preparation of a solid polymeric phosphate with a molecular weight of at least about 1500 and a softening temperature of at least about 10Â° C. comprising the steps of:a. reacting a phosphorus oxyhalide with a monohydroxyaromatic compound to form a monoaryldihalophosphate; b. removing substantially all of any remaining phosphorus oxyhalide; c. reacting the monoaryldichlorophosphate product with a dihydroxyaromatic compound; and d. reacting the product of step (c) with a monohydroxyaromatic compound wherein the polymer thus formed is a solid with a linear structure and with less than 10 ppm halogen bound to phosphorus.