Production of an ethanol solution of ethyl or butyl...

Details Production of an ethanol solution of ethyl or butyl... Production of an ethanol solution of ethyl or butyl...

C - Chemistry, Metallurgy

08

L

C08L 35/08 (2006.01) C08F 2/14 (2006.01) C08F 8/14 (2006.01)

Patent

CA 2129333

A process for the production of an ethanol solution of an ethyl or butyl alkyl 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 °C; preferably 70-80 °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°C into said copolymer solution while simultaneously distilling out acetone therefrom at atmospheric pressure.

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