Mixed phosphoric acid ester compositions are prepared by reacting at a low temperature in an anhydrous system, and in the presence of a catalytic amount of sodium, an ester of phosphoric acid having the formula:
wherein R1 may be the same or a different aromatic radical selected from the group consisting of phenyl and substituted phenyl radicals; with an aliphatic alcohol having the formula:
wherein R2 ist the same or a different aliphatic radical selected from the group consisting of alkyl and alkoxy I radicals. A transesterification mixture is obtained that contains a substantial amount of each of the compounds:
wherein R1 and R2 are the radicals defined above
The mixed phosphate acid ester composition may be separated from alcohols present in the transesterification mixture by distillation, and are useful plasticizers for polyvinyl chloride polymers.
混合
磷酸酯组合物的制备方法是:在无
水体系中,在催化量
钠的存在下,在低温下使具有以下式子的
磷酸酯发生反应: 其中 R1 可以是从苯基和取代苯基组成的组中选出的相同或不同的芳香族基;具有以下式子的脂肪族醇: 其中 R2 是从烷基和烷氧基 I 组成的组中选出的相同或不同的脂肪族基。 得到的酯交换混合物含有大量的每种化合物: 其中 R1 和 R2 是上面定义的基 混合
磷酸酯组合物可以通过蒸馏从存在于酯交换混合物中的醇中分离出来,是聚
氯乙烯聚合物的有用
增塑剂。