Preparation of copolymers of monoalkyl maleates and vinyl alkyl ethers
AssigneeBASF SE
InventorsHans-Helmut Goertz, Ferdinand Straub, Friedrich Vogel, Franz Frosch, Paul Naegele, Hans-Juergen Raubenheimer
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Abstract
Copolymers of monoalkyl maleates and vinyl alkyl ethers are prepared by free radical copolymerization of maleic anhydride and a vinyl alkyl ether followed by reaction with an alkanol, by a process in which the vinyl alkyl ether component is present in excess in the reaction mixture in each phase of the polymerization, the free radical copolymerization is carried out in acetone and the acetone is removed by distillation during or after ester formation at up to 70.degree. C.
Claims11
A process for the preparation of a copolymer of a mono-lower alkyl maleate and a vinyl lower alkyl ether followed by reaction with a lower alkanol, which comprises reacting maleic anhydride with a molar excess of a vinyl lower alkyl ether in each phase of polymerization, wherein said polymerization is carried out in acetone, said acetone being removed by distillation either during or after product ester formation at up to about 70.degree. C., and further wherein said molar excess of vinyl lower alkyl ether is from a molar excess sufficient to achieve substantially complete conversion of maleic anhydride to up to about 15 mol%.
Dependencies are inferred from the claim text.