PRODUCTION OF AN ETHANOL SOLUTION OF ETHYL OR BUTYL HALF-ESTER OF A COPOLYMER

A process for the production of an ethanol solution of an ethyl or butyl alk yl half-ester copolymer of maleic anhydride and an alkyl vinyl ether which comprises: (a) copolymerizing the monomers in acetone as solvent by simultaneously feeding molten maleic anhydride, a molar excess of methyl vinyl e...

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Bibliographische Detailangaben
Hauptverfasser:	TAZI, MOHAMMED, ZAMORA, JOHN N, CARLIN, ALAN J
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	CHEMISTRY COMPOSITIONS BASED THEREON MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-UP
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Beschreibung
Zusammenfassung:	A process for the production of an ethanol solution of an ethyl or butyl alk yl half-ester copolymer of maleic anhydride and an alkyl vinyl ether which comprises: (a) copolymerizing the monomers in acetone as solvent by simultaneously feeding molten maleic anhydride, a molar excess of methyl vinyl ether, and a solution of a free radical initiator in acetone, into a reactor pre- charged with acetone, at about 68-85 .degree.C; preferably 70-80 .degree.C; (b) esterifying the acetone solution of said copolymer with ethanol or butanol; and (c) solvent exchanging ethanol for acetone by continuously injecting vapors of ethanol at about 85-95.degree.C into said copolymer solution while simultaneously distilling out acetone therefrom at atmospheric pressure.