Disclosed is a method for the preparation of polymeric phosphate flame retardants with a molecular weight of at least about 1500 and a softening temperature of at least about 10° C. comprising the steps of (a) reacting a phosphorus oxyhalide with a monohydroxyaromatic compound, (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. The solid polymeric flame retardant has a linear structure and less than 10 ppm halogen bound to phosphorus. Also disclosed are resinous compositions comprising the solid polymeric phosphate made by the method of the invention and at least one other polymeric resin.
本发明揭示了一种制备分子量至少为约1500且软化温度至少为约10℃的聚酸酯
磷系阻燃剂的方法,包括以下步骤:(a)将氧
卤化磷与单羟基芳香化合物反应,(b)去除几乎所有剩余的氧
卤化磷;(c)将单芳基二
氯磷酸酯产物与双羟基芳香化合物反应,(d)将步骤(c)的产物与单羟基芳香化合物反应。固体聚酸酯
磷系阻燃剂具有线性结构,并且
磷上结合的卤素少于10ppm。本发明还揭示了由本发明方法制备的固体聚酸酯
磷系阻燃剂和至少一种其他聚合物
树脂组成的
树脂组合物。