Multi-stage process for producing heat resistant...

C - Chemistry – Metallurgy – 08 – F

Patent

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Details

C08F 20/14 (2006.01) C08F 6/00 (2006.01) C08J 5/00 (2006.01)

Patent

CA 2249557

The invention concerns a process for producing polymethacrylate moulding compounds, which have high thermal dimensional stability and high stability with respect to thermal decomposition, by the radical polymerization of methylmethacrylate monomers and optionally comonomers in at least two reactors operated successively, ensuring a high degree of blending. The process is characterized in that: a) a first reactor is operated at a temperature of less than 120 ~C; and b) a second reactor or further successive reactors is/are operated in a temperature range of more than 130 ~C and at most 200 ~C.

L'invention concerne un procédé de production de matières de moulage en polyméthacrylate thermostables et très résistantes à la décomposition thermique. Ces matières de moulage s'obtiennent par polymérisation par voie radicalaire de monomères de méthylacrylate et éventuellement de comonomères dans au moins deux réacteurs actionnés successivement, dans lesquels est assuré un haut degré de mélange intime. Ce procédé se caractérise en ce que a) un premier réacteur est actionné à une température inférieure à 120 ·C et que b) un second réacteur ou d'autres réacteurs successifs est(sont) actionné(s) dans une plage de températures supérieures à 130 ·C et atteignant au plus 200 ·C.

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