TWO-STAGE OXIDATION OF POLYARYLENE SULFIDE

Polyarylene thioethers containing recurring units of the formula [-(S-E-)a-(-SO-E-)b-(SO2-E)c-] in which E, independently of one another, are phenylene, naphthylene or biphenylene, a and c, independently of one another, have values of from 0 to less than 1, and b has a value of from greater than 0 t...

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Bibliographische Detailangaben
Hauptverfasser:	IERUGEN KURUPE, DEIITORITSUHI FURAISHIYAA, ANDOREASU SHIYURAIHIYAA, HAINTSU SHIYUTORUTSUTSU
Format:	Patent
Sprache:	eng
Schlagworte:	BEARINGS BLASTING CHEMISTRY COMPOSITIONS BASED THEREON COMPOSITIONS OF MACROMOLECULAR COMPOUNDS ELEMENTS OR CRANKSHAFT MECHANISMS ENGINEERING ELEMENTS AND UNITS FLEXIBLE SHAFTS GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HEATING LIGHTING MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS MECHANICAL ENGINEERING METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS ROTARY BODIES OTHER THAN GEARING ELEMENTS SHAFTS THEIR PREPARATION OR CHEMICAL WORKING-UP THERMAL INSULATION IN GENERAL WEAPONS
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Beschreibung
Zusammenfassung:	Polyarylene thioethers containing recurring units of the formula [-(S-E-)a-(-SO-E-)b-(SO2-E)c-] in which E, independently of one another, are phenylene, naphthylene or biphenylene, a and c, independently of one another, have values of from 0 to less than 1, and b has a value of from greater than 0 to less than 1, with the proviso that the sum a + b + c is equal to 1 and at least two of the indices are greater than 0, are obtained by oxidation of polyarylene sulfides in two steps, where, in the first step, a polymer in solid form is oxidised using ozone in a suspension medium, and the resulting reaction product is reacted, in the second step, with hydrogen peroxide in acetic acid in the presence of catalytic amounts of concentrated sulfuric acid and/or with the addition of equilibrium peracids. The polyarylene thioethers are suitable for the production of high-temperature-resistant and highly chemicals-resistant mouldings.