Process for producing polymethyl methacrylate

Details Process for producing polymethyl methacrylate Process for producing polymethyl methacrylate

C - Chemistry, Metallurgy

08

F

402/521

C08F 2/02 (2006.01) C08F 20/14 (2006.01)

Patent

CA 1281498

ABSTRACT A continuous process for producing polymethyl methacrylate (PMMA) or its copolymer comprises precooling a monomeric feedstock consisting of methyl methacrylate (MMA) or a mixture of MMA and up to 10 mol% of a highly thermal= radical-forming monomer, forcing the feedstock into a reactor wherein a preceding charge is being circulated under pressure, instantaneously mixing the whole charge and cooling it by dint of the sensible heat of the monomeric feedstock, while thorough- ly mixing the hot radicals, thus effecting the polymerization within a short time period, continuously taking out from the reactor the polymerization product and unreacted monomer or monomers being circulatingly mixed, at a polymerization product proportion of 50% by weight or less, conducting the mixture, while preheating it, into a vacuum vessel, removing therein the remaining monomer or monomers by evaporation, and then recovering the polymerization product.

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