Method for producing butanediol dimethacrylates

Details Method for producing butanediol dimethacrylates Method for producing butanediol dimethacrylates

C - Chemistry, Metallurgy

07

C

C07C 67/03 (2006.01) C07C 69/54 (2006.01)

Patent

CA 2692614

The present invention relates to a process for preparing butanediol dimethacrylates, which comprises the transesterification of butanediol with an ester of methacrylic acid in the presence of catalysts, wherein a combination comprising at least one lithium compound and at least one calcium compound is used as catalyst, at least one of the compounds of lithium and/or of calcium is an oxide, a hydroxide, an alkoxide having from 1 to 4 carbon atoms or a carboxylate having from 1 to 4 carbon atoms and at least part of the reaction is carried out in the presence of an effective amount of water. The process of the invention makes a particularly inexpensive preparation of butanediol dimethacrylates having a very high purity possible.

La présente invention concerne un procédé de production de diméthacrylates de butanediol, consistant en la transestérification de butanediol avec un ester de l'acide méthacrylique en présence de catalyseurs, une association composée d'au moins un composé de lithium et d'au moins un composé de calcium étant utilisée comme catalyseur, au moins un des composés du lithium et/ou du calcium étant un oxyde, un hydroxyde, un alcoxyde présentant 1 à 4 atomes de carbone ou un carboxylate présentant 1 à 4 atomes de carbone et au moins une partie de la réaction ayant lieu en présence d'une quantité d'eau garantissant un certain effet. Le procédé selon l'invention permet de produire des diméthacrylates de butanediol de très haute pureté d'une façon particulièrement économique.

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