Process for producing an unsymmetrical diester of .alpha.,...

C - Chemistry – Metallurgy – 07 – C

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C07C 69/657 (2006.01) C07C 67/08 (2006.01)

Patent

CA 2145468

A process for producing a colorless unsymmetrical diester of maleic acid, useful as a raw material of an emulsifier for emulsion polymerization and as a modifier for a polymer, which comprises: (1) reacting maleic anhydride with a monohydric alcohol in the presence of an inert organic solvent, in a molar ratio of 1:(1.0-1.2) to obtain maleic acid mono ester containing substantially no unreacted maleic anhydride, and (2) reacting said monoester with an alkenyl halide in the presence of a tertiary amine and water, in a molar ratio of said monoester:water of 1:(0.01-0.20). -15-

Un procédé pour produire un diester non symétrique incolore de l'acide maléique, utile comme matière première pour fabriquer un émulsifiant pour la polymérisation par émulsion et comme modificateur pour polymère, qui consiste : 1) à faire réagir de l'anhydride maléique avec un alcool monohydrique en présence d'un solvant organique inerte, dans un rapport molaire de 1:(1,0-1,2) pour obtenir un monoester d'acide maléique substantiellement dépourvu d'anhydride maléique n'ayant pas réagi, et 2) à faire réagir ledit monoester avec un halogénure d'alkényle en présence d'une amine tertiaire et d'eau, dans un rapport molaire monoester:eau de 1:(0,01-0,20).

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