Enichimica S.p.a.

Enichem S.p.a

Jan Bialy

Irena Penczek

Wlodzimierz Mista

Jolanta Cmielowska

Nikuca Kopytowska

Dorota Grzelak

Zbingniew Dobkowski

Josef Wrzyszcz

Stanislaw Maczenski

Kazimierz Mazur

Jerzy Bialek

Janina Werle

Hanna Grabowska

Marek Plesnar

Marek Borensztajn

Wlodzimierz Kaczmarczyk

Wanda Kosinska

Thermally stable compositions, also showing high fluidity in the molten state comprise polyphenylene oxide, or a mixture of polyphenylene oxide with a styrene polymer, and a stabilizer system consisting of 2,4-bis(n-octylthio)-6-(4-hydroxy-3,5-di-tert.butylanilino)-1,3,5-triazine and dilauryl thiopropanoate.

Compositions of polyphenylene oxide or of mixtures of polyphenylene

Process for the production of polyphenyleneoxide, in which:

Process for the production of polyphenylene-oxide

Preparation of alkylation catalysts containing iron oxide and/or chromium oxide, by means of a process which comprises:

Process for preparing alkylation catalysts

A raw 2,6-xylenol product is purified by melting it, then slowly and uniformly cooling it until at least 60 to 100% is crystallized, with the greater concentration of the impurities being present nearer the surface of the resulting crystals, gradually heating the crystalline solid mass to an elevated temperature no higher than by 0.1.degree. to 5.degree. C. below the solidification temperature of 2,6-xylenol to cause only surface melting of the crystals, thus yielding a molten liquid phase and a solid crystalline phase, the solid phase containing 2,6-xylenol in greater purity than the molten phase.

Process for purifying 2,6-xylenol

Process for the production of polyphenylene oxide by means of the oxidative polymerization of 2,6-xylenol, with either oxygen or a gas containing molecular oxygen, in the presence of a catalyst, by continuously operating in a circulation system, and with the precipitation of the polymer in the liquid reaction medium.

Process for the production of polyphenylene oxide

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Warsaw, Poland

Jan Bialy