| 摘要 |
PURPOSE:To obtain the titled transparent high-purity compound, by esterifying (meth)acrylic acid with an alcohol in the presence of an acid catalyst, dehydrating, desolvating and purifying the reaction mixture leaving a specific amount of impurities in a layer of an esterification product and filtering the resultant product. CONSTITUTION:Acrylic or methacrylic acid is esterified with an alcohol, e.g. tripropylene glycol, in an organic solvent, e.g. benzene or toluene, in the presence of an acid catalyst, e.g. p-toluenesulfonic acid, etc., and a polymerization inhibitor, e.g. hydroquinone, etc., at refluxing temperature, preferably 70-130 deg.C for 3-15hr and the reaction mixture is washed and purified with an aqueous solution of an alkali leaving 0.05-3wt% impurities, e.g. the unreacted material, acid catalyst, polymerization inhibitor, etc., in a layer of an esterification product. The resultant layer is dehydrated, desolvated and filtered to afford the aimed transparent and high-purity, particularly high-boiling compound. EFFECT:The ester is transparent without haze and precipitation even after storage for a long period.
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