| 摘要 |
<p>A process for forming a composition containing over, for example, about 90 % by weight of an alkylene-arylene bridging group-containing bis(diphenyl phosphate) compound and less than, for example, 10 % by weight of monophosphate by-product. This process involves the reaction of a composition containing a diphenyl halophosphate and an alkylene-arylene bridging group-containing diol, in the presence of a catalytic amount of a Lewis acid catalyst, utilizing a means, during the course of the reaction, for removal of hydrohalide by-product. The preferred means that are used for removal of hydrohalide by-product include: utilizing vacuum to remove such by-product; utilizing sparging with an inert gas; utilizing vacuum to remove such by-product in combination with performing the reaction in a hydrocarbon solvent; utilizing sparging with an inert gas in combination with performing the reaction in a hydrocarbon solvent; and utilizing vacuum and sparging with an inert gas in combination with performing the reaction in a hydrocarbon solvent to remove such by-product.</p> |
