Process for the preparation of (meth)acrylates of tetra- or...

Details Process for the preparation of (meth)acrylates of tetra- or... Process for the preparation of (meth)acrylates of tetra- or...

C - Chemistry, Metallurgy

07

C

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

Patent

CA 2622353

Process for the preparation of acrylic and methacrylic acid esters by transesterification of (meth)acrylic acid esters of the formula I: where R1 is H or CH3 and R2 is an alkyl radical having 1 to 40 carbon atoms, with alkanols which have four or more esterifiable hydroxyl groups, characterized in that 0.01 to 10% by weight, based on the total reaction mixture, of lithium amide catalysts are used as transesterification catalyst.

L'invention concerne un procédé servant à produire des acrylates et des méthacrylates par transestérification de (méth)acrylates de formule (I), dans laquelle R1 représente H ou CH3 et R2 représente un reste alkyle ayant 1 à 40 atomes de carbone, avec des alcanols présentant au moins quatre groupes hydroxyle estérifiables. Le procédé selon l'invention est caractérisé en ce qu'on utilise, comme catalyseur de transestérification, 0,01 à 10 % en poids par rapport au mélange réactionnel total de catalyseurs à l'amide de lithium.

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