Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1976-08-19
1978-02-28
Czaja, Donald E.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
209316, 210 70, 210 71, 210DIG15, 366 76, 260 342, C08K 501
Patent
active
040766810
ABSTRACT:
The invention is directed to a process of dissolving a high molecular weight olefin polymer having an inherent viscosity of at least 3.5 in a hot hydrocarbon solvent to form solutions which are totally free of undissolved polymer particles. Apparatus for carrying out the process also is described.
The process includes stirring a slurry of fine particles of the polymer and the solvent in a chamber whose inlet and outlet are covered with screens. The outlet screen has a smaller mesh than the inlet screen. The solution is filtered through the outlet screen into a second chamber which is similar to the first one except that the second outlet screen is finer than the first outlet screen. The stirring and filtering through successively finer outlet screens is repeated in a series of chambers until a solution which is free of undissolved polymer particles is obtained. The solution is kept at least 190.degree. C throughout the process.
REFERENCES:
patent: 2894824 (1959-07-01), Lanning
patent: 2930787 (1960-03-01), Stalder
Watt et al. - Chemistry, (Norton), (N.Y.) (1964), p. 236.
Boehme Robert Emerson
Murphy Clarence Rhodes
Czaja Donald E.
Fletcher H. H.
Gulf Oil Corporation
Kelly Richard L.
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