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US 4,071,509 AGranted
Arylene sulfide polymer purification
AssigneePhillips Petroleum Company
InventorJames T. Edmonds, Jr.
Life of this patent
Estimating the term…
Abstract
Arylene sulfide polymers containing ash-forming impurities or materials are purified by heating such polymers with an organic amide and an alkali metal salt selected from carboxylates, carbonates, and selected lithium halides under conditions sufficient to reduce the ash-forming impurities without extensive polymer degradation.
Claims10
A process for the reduction of ash-forming impurities contained in arylene sulfide polymers without extensive degradation of the polymer which comprises:
- a. forming a mixture comprising an arylene sulfide polymer containing at least 0.10 weight percent ash-forming impurities or materials, an organic amide, and at least one alkali metal salt selected from the group consisting of alkali metal carboxylates, alkali metal carbonates, and lithium halides selected from the group consisting of lithium chloride, lithium bromide, and lithium iodide, the amount of alkali metal salt present being sufficient to inhibit degradation of the polymer or to increase the molecular weight of the polymer, and
- b. heating said mixture formed in (a) at an elevated temperature and for a period of time sufficient to produce an arylene sulfide polymer of appreciably reduced ash content without extensive degradation of said polymer.
Dependencies are inferred from the claim text.