The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 28, 1978
Filed:
Aug. 19, 1976
Robert Emerson Boehme, Houston, TX (US);
Clarence Rhodes Murphy, Houston, TX (US);
Gulf Oil Corporation, Pittsburgh, PA (US);
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.