C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
402/5.5
C08F 6/26 (2006.01) C08F 6/00 (2006.01) C08F 14/06 (2006.01)
Patent
CA 1109193
AN IMPROVED METHOD OF DEGASSING POLYMERS AND COPOLYMERS PREPARED BY MASS POLYMERIZING A MONOMERIC COMPOSITION BASED ON VINYL CHLORIDE ABSTRACT OF THE DISCLOSURE An improved method of degassing polymers and co- polymers prepared by mass polymerizing a monomeric composi- tion, based on vinyl chloride. The polymer is kept under agitation, the monomeric composition to be eliminated is brought from polymerization pressure to a pressure below 120 mm of mercury, the polymer is brought to or kept at a temperature of at least 70°C. and below the temperature at which degradation of the polymer or copolymer commences, and these conditions of pressure and temperature are maintained substantially until the degassing process stops, the polymer being put into contact with a quantity of water representing 0.01 to 0.8% and preferably 0.05 to 0.5% of its weight, after the residual monomeric vinyl chloride content of the polymer or copolymer has been reduced below 2000 ppm. The polymers and copolymers obtained, before be- ing placed in open air, have a residual monomeric vinyl chloride content which is less than 50 ppm, generally less than 20 ppm and may be as little as 1 ppm.
248892
Pompon Jean-Bernard
Soussan Salomon
Smart & Biggar
Societe Rhone-Poulenc Industries
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