Process for the preparation of polyglycol(meth)acrylates

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 65/32 (2006.01) B01J 23/02 (2006.01) C07C 67/03 (2006.01) C07C 69/54 (2006.01) C08G 65/332 (2006.01)

Patent

CA 2243514

The invention relates to a transesterification process for the preparation of (meth)acrylates of the formula (I), in which A is a radical selected from the group comprising -CH2CH2-, -CH2CH2CH2-, (A), (B), R' is a straight-chained or branched alkyl radical, optionally substituted with an aryl radical or an aryloxy radical and having 1 to 28 carbon atoms or for a radical (C), R'' is hydrogen or methyl and n is an integer from 2 to 250, in a transesterification reaction, during which there is transesterification of a (meth)acrylate of the formula (II), in which R is a lower alkyl radical and R'' has the above meanings in the presence of a transesterification catalyst comprising calcium hydroxide (Ca(OH)2) or consisting of calcium hydroxide in association with lithium chloride with an alcohol of the formula (III) R'''-(O-A-)n-OH, in which R''' is hydrogen or the radical R', and A and n have the above meanings.

L'invention concerne un procédé de transestérification pour la production, par une réaction de transestérification, de (méth)acrylate de formule (I), dans laquelle A représente un reste choisi dans le groupe comprenant -CH2CH2-, -CH2CH2-CH2-, (A), (B), R' représente un reste alkyle à chaîne droite ou ramifiée et éventuellement substitué par un reste alkyle ou aryloxy, comprenant 12 à 28 atomes de carbone, ou représente un reste (C); R" représente hydrogène ou méthyle et n est un entier de 2 à 250. Dans ledit procédé, on transestérifie un (méth)acrylate de formule (II), dans laquelle R représente un reste alkyle inférieur et R" a les significations données ci-dessus, en présence d'un catalyseur de transestérification à l'hydroxyde de calcium (Ca(OH)2) ou à l'hydroxyde de calcium combiné à du chlorure de lithium avec un alcool de formule (III) R'''-(O-A-)n-OH, dans laquelle R''' représente hydrogène ou le reste R' et A et n ont les significations données ci-dessus.

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