Process for the manufacture of poly (hydrocarbylene aryl phosphate) compositions
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United States of America Patent
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Oct 10, 1995
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app pub date -
Nov 15, 1993
filing date -
Mar 3, 1993
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Abstract
Arylene poly(diarylphosphate) compositions can be formed by a process which comprises: (a) forming a reaction mixture comprising diaryl halophosphate and, as by-products, a mixture of monoaryl dihalophosphate and triarylphosphate, by reaction of phosphorus oxyhalide and a phenol in a first reactor; (b) if a preponderance of lower oligomers is desired, optionally transferring the reaction mixture from (a) to a subsequent reactor where at least a portion of the monoaryl dihalophosphate is recycled to the first reactor for reaction with the phenol contained therein to form additional diaryl halophosphate in the first reactor and the reaction mixture in (b) becomes enriched with diaryl halophosphate to ultimately favor the ultimate formation of a product of lower molecular weight distribution; and (c) reacting the product from (a) or (b), as selected, with an aromatic diol to form the arylene poly(diarylphosphate) product.
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