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:
May. 17, 1977
Filed:
May. 27, 1975
Robert W Campbell, Bartlesville, OK (US);
Harold D Yelton, Bartlesville, OK (US);
Phillips Petroleum Company, Bartlesville, OK (US);
Abstract
P-Phenylene sulfide polymers are produced by reacting a mixture of p-dihalobenzene, at least one organic amide, lithium sulfide and additional alkali metal sulfide chosen from among sodium sulfide, potassium sulfide, rubidium sulfide, cesium sulfide, and mixtures thereof at conditions suitable for producing a polymer. The use of additional alkali metal sulfide along with lithium sulfide produces polymers of higher molecular weight than can be prepared using a single alkali metal sulfide. The higher molecular weight polymer can be molded into films which, upon quenching, are tough, creasible, and opaque as contrasted with the brittle, transparent character of quenched, molded films produced from polymer prepared using a single alkali metal sulfide.