C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
402/488, 402/516
C08F 2/02 (2006.01) C08F 12/08 (2006.01) C08F 112/08 (2006.01) C08F 212/08 (2006.01)
Patent
CA 1070897
Abstract Or the Disclosure A process for the polymerisation of aromatic vinyl compounds and their copolymerisation with alkyl esters or nitriles of acry- lic and/or methacrylic acid, wherein 1) in a first stage, the monomer or monomers is or are conti- nuously introduced at excess pressure into a first reaction zone and polymerised there to a degree of conversion of 5 - 40 % by weight at a temperature of from 80 to 170°C; 2) in a second stage, the reaction mixture is conducted at con- stant pressure into a second reaction zone designed for con- ducting highly viscous melts, the mixture flowing through this reaction zone at a rate which is 1.1 to 5 times the in- trinsic rate, and polymerised there to a degree of conversion of 40 to 95% at temperatures of from 120 to 250°C, the ex- cess pressure in the first and second stage being chosen so that the monomer or monomers is or are liquid, and the poly- mer is continuously removed from this zone with release of the pressure; and 3) in a third stage, unreacted monomer is removed by evaporation, the pressure being chosen so that the monomer or monomers is or are evaporated, and the polymer is discharged as a melt.
233481
Muller Ernst-Willi
Wicke Manfred
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