Precipitation of polycycloolefins

Details Precipitation of polycycloolefins Precipitation of polycycloolefins

C - Chemistry, Metallurgy

08

F

402/398

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

Patent

CA 1222596

ABSTRACT OF THE DISCLOSURE Precipitation of a polymer from polymer cement containing about 15 to 80% solids is accomplished by mixing the cement with water and a nonsolvent hydrocarbon near or above the boiling point of a ternary azeotrope whereby the polymer precipitates forming a slurry and the ternary azeotrope is withdrawn as a vapor, separating the polymer from the liquid phase and recycling the liquid phase to the mixing step, the polymer cement being a honey-like solution in a nonpolar solvent of a polymer prepared by ring opening polymerization in the nonpolar solvent of at least one cyclic olefin containing at least one norbornene group, the nonsolvent hydrocarbon is selected from lower alcohols that form binary azeotropes with water, and the ternary azeotrope comprising the nonpolar solvent, the nonsolvent hydrocarbon, and water. The process can be operated either in batchwise segments or continuously throughout.

427187

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