Preparation of esters of low residual acid content from .alpha., .beta.-ethylenically unsaturated carboxylic acids and hydroxyl-containing polymers

US6063957A · kind A · utility

Assignee

• BASF SE

Inventors

• Rainer Koniger · Freinsheim, DE
• Wolfgang Reich · Frankenthal (Pfalz), DE
• Erich Beck · Ladenburg, DE
• Helmut Gruner · Schwarzheide, DE

Key dates

• Filing date: Apr 21, 1998
• Grant date: May 16, 2000
• Expiry date: Apr 21, 2018

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L2312/00
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for preparing esters E of low residual acid content from .alpha.,.beta.-monoethylenically unsaturated C.sub.3 -C.sub.6 mono- and dicarboxylic acids S and hydroxyl-containing polycondensates P, where PA1 a) the acid S and the polycondensate P or the monomeric and/or oligomeric and/or polymeric components which form the polycondensate P, are reacted in the presence or absence of a solvent and/or of an esterification catalyst and/or of further additives, with removal of the water which forms, and PA1 b) the unreacted acid S is removed by distillation, comprises adding water for the distillative removal of the acid S in step b).