Anhydrous precipitation of polycycloolefins

Details Anhydrous precipitation of polycycloolefins Anhydrous precipitation of polycycloolefins

C - Chemistry, Metallurgy

08

F

402/398

C08F 6/12 (2006.01) C08G 61/08 (2006.01)

Patent

CA 1210195

ABSTRACT OF THE DISCLOSURE Precipitation of polymer from a polymer cement comprising the polymer dissolved in cyclohexane is accomplished by mixing the cement with methanol whereby the polymer precipitates forming a polymer slurry comprising polymer solids dispersed in cyclo- hexane and methanol, heating the polymer slurry to vaporize methanol and cyclohexane in azeotropic proportion, condensing the vaporized methanol and cyclohexane whereby it separates into an upper phase that is nearly all cyclohexane and a lower phase that is rich in methanol, separating the phases, and separating the polymer from the residual slurry com- prising polymer solids dispersed in methanol, the polymer being a reaction product formed by ring opening polymerization of at least one monomer containing at least one norbornene group. The process can be con- ducted in batchwise segments or continuously throughout.

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