Preparation of 2,2,4-trimethyl-1,3-pentanediol dibenzoate and di(alkyl-substituted) benzoates
申请人:VELSICOL CHEMICAL CORPORATION
公开号:EP0673916A1
公开(公告)日:1995-09-27
A process for the preparation of 2,2,4-trimethyl-1,3-pentanediol dibenzoate or di(alkyl-substituted) benzoates by transesterification of 2,2,4-trimethyl-1,3-pentanediol or esters of 2,2,4-trimethyl-1,3-pentanediol with esters of benzoic acid or alkyl-substituted benzoic acids while removing volatile alcohol or ester by-product, comprising transesterifying 2,2,4-trimethyl-1,3-pentanediol or an ester of 2,2,4-trimethyl-1,3-pentanediol and one or more mono-carboxylic acids having from 1 to 4 carbon atoms, or mixtures thereof, with an ester having the formula
wherein R=a C₁-C₄ alkyl, alkenyl or alkynyl group and R¹, R¹¹, R¹¹¹, and R¹¹¹¹ are any combination of H and alkyl groups having 1 to 4 carbon atoms, in the presence of a catalytic amount of one or more basic compounds selected from the group consisting of the hydroxides, alkoxides, glycolates, amides, hydrides, and other comparably strongly basic anionic species of the alkali and alkaline earth (excluding magnesium) metals, and quaternary ammonium hydroxides and alkoxides, whereby the diester is obtained in high yield. Mono- and di-esters of 2,2,4-trimethyl-1,3-pentanediol and benzoic acids are useful plasticizers for vinyl chloride polymers, and other polymers, particularly for imparting improved stain resistance to plasticized compositions.
一种通过
2,2,4-三甲基-1,3-戊二醇或
2,2,4-三甲基-1,3-戊二醇的酯与
苯甲酸或烷基取代
苯甲酸的酯进行酯交换反应制备
2,2,4-三甲基-1,3-戊二醇二苯甲酸酯或二(烷基取代)
苯甲酸酯的工艺,同时去除挥发性醇或酯副产物、包括将
2,2,4-三甲基-1,3-戊二醇或
2,2,4-三甲基-1,3-戊二醇与一种或多种具有 1 至 4 个碳原子的单
羧酸或其混合物的酯与具有以下式子的酯进行酯交换反应
其中 R=a C₁-C₄烷基、烯基或炔基,R¹、R¹¹、R¹¹¹和 R¹¹¹ 是 H 和具有 1 至 4 个碳原子的烷基的任意组合、碱
金属和碱土
金属(不包括
镁)的氢氧化物、烷氧基化物、
乙二醇化物、酰胺、
氢化物和其他类似的强碱性阴离子物质,以及季
铵氢氧化物和烷氧基化物组成的组中的一种或多种碱性化合物的催化下,可获得高产率的二酯。
2,2,4-三甲基-1,3-戊二醇和
苯甲酸的单酯和二酯是
氯乙烯聚合物和其他聚合物的有用
增塑剂,特别是可以提高增塑组合物的抗污性。