Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1982-01-06
1982-11-23
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
C08K 501
Patent
active
043606296
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.
REFERENCES:
patent: 3980626 (1976-09-01), Hepworth
patent: 4028482 (1977-06-01), Ueshima et al.
patent: 4324717 (1982-04-01), Layer
Lane, Jr. Parley C.
Wootton Gerald V.
Yi Kong S.
Kap George A.
Sarofim N.
Schofer Joseph L.
The B. F. Goodrich Company
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