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:
Dec. 20, 1977
Filed:
Jan. 19, 1976
James T Edmonds, Jr, Bartlesville, OK (US);
Phillips Petroleum Company, Bartlesville, OK (US);
Abstract
A method is provided for producing arylene sulfide polymers employing a p-dihalobenzene, an alkali metal sulfide, lithium acetate, an N-alkyl-2-pyrrolidone, and optionally a polyhalo aromatic compound having more than two halogen substituents per molecule, preferably with the addition of a base selected from alkali metal hydroxides and alkali metal carbonates at polymerization conditions. A first composition comprising N-alkyl-2-pyrrolidone, lithium acetate and water is prepared and subjected to dehydration conditions after which a composition containing at least 50 weight percent water, an alkali metal sulfide and preferably containing a base is added to the first dehydrated composition and a second dehydration performed. A composition resulting from the second dehydration is then contacted with a p-dihalobenzene, and optionally a polyhalo aromatic compound having more than two halogen substituents per molecule, at polymerization conditions to form arylene sulfide polymers of higher molecular weight than produced without the two-step dehydration. The two-step dehydration also results in less foaming and flooding of the distillation column as compared with the process using a single dehydration.