Cps Chemical Company, Inc.

Philip L Meisel

Louis E Trapasso

Purnendu Mukhopadhyay

Peter F Epstein

Stanley J Padegimas

Paul L Hung

Lee B Meisel

Louise E Trapasso

Willy K Chwang

Methyl or ethyl esters of mono- and polycarboxylic acids are transesterified with alcohols and polyols by reaction in the presence of a catalytically effective amount of organotin catalyst, so that an alcohol or polyol carboxylic acid ester is formed, which is then washed with aqueous alkali having a pH bigger than about 13.2 so as to remove essentially all of the organotin catalyst, thereby permitting the recovery of the alcohol or polyol carboxylic acid ester essentially free of the organotin catalyst.

Organotin catalyzed transesterification

Esters of acrylic and methacrylic acid with alcohols and polyols having levels of purity greater than about 95% as measured by gas chromatography using an 11 meter RT.times.200 trifluoropropylmethyl polysiloxane column, a flame ionization detector, an injection temperature of 200.degree. C., an initial column temperature of 90.degree. C. for two minutes, followed by heating to 270.degree. C. at a rate of 8.degree. C. per minute and a detector temperature of 300.degree. C.

Organotin catalyzed transesterification products

Esters of monocarboxylic acids are transesterified with 1,2- and 1,3-polyols by reaction in the presence of a catalytically effective amount of a dialkyltin oxide blended with an excess of dialkyltin dichloride, so that a polyol ester of the monocarboxylic acid is formed. A transesterification reaction of alcohols and polyols with methyl or ethyl mono- or polycarboxylic acid esters utilizing a dimethyltin catalyst is also disclosed, in which the alcohol or polyol carboxylic acid ester formed is essentially free of the organotin catalyst. Carboxylic acid esters produced by the described methods, as well as carboxylic acid esters that are free of organotin catalysts are also disclosed.

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Greenbrook, NJ, United States of America

Philip L Meisel