PROCEDE DE PREPARATION D'ESTERS ACRYLIQUES

摘要

Ester-type oligomers containing up to about 3 carboxylate units in the molecule are encountered in esterifying acrylic acid with an alkanol to prepare a monomeric acrylate ester. Their formation results in a loss of chemical efficiency and they also constitute a waste-disposal problem. The present invention constitutes a method for converting such oligomers back to an industrially useful product comprising monomeric acrylate moiety, comprising heating to a specified temperature in the presence of a material which is an inhibitor against vinyl-type polymerization. The resulting monomer-containing products can be recycled to the acrylate esterification process without additional treatment or purification, with resulting increased chemical efficiency in the esterification process.