Nonsolvent preconcentration of polymeric cycloolefins
AssigneeThe B. F. Goodrich Company
InventorsGerald V. Wootton, Parley C. Lane, Jr., Kong S. Yi
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Abstract
Process for preconcentrating polymer cement normally containing about 15% solids comprising mixing therewith an amount of a hydrocarbon nonsolvent liquid sufficient to form a two-phase system but insufficient to precipitate the polymer, and separating the two phases; the polymer cement is a honey-like solution of a polymer prepared by ring opening polymerization of at least one monomer containing the norbornene group in a nonpolar hydrocarbon solvent; the upper phase being a thin hydrocarbon liquid comprising nonsolvent, a substantial portion of the nonpolar solvent in the polymer cement, and impurities, and the lower phase being a preconcentrated polymer cement containing at least 20% solids.
Claims10
Process for preconcentrating a polymer cement that is a solution of a polymer prepared by ring opening polymerization in a nonpolar hydrocarbon solvent of at least one monomer containing the norbornene group shown below, ##STR3## said process comprising mixing with said polymer cement a hydrocarbon nonsolvent in an amount sufficient to cause formation of separate phases but an insufficient amount to precipitate said polymer, and separating said phases;
- one of said phases being a preconcentrated polymer cement that is more viscous and contains a substantially larger proportion of solids than said polymer cement, and said nonsolvent being miscible with said nonpolar solvent but said polymer being insoluble in said nonsolvent.
Dependencies are inferred from the claim text.