Process for the reduction of color in polyphenylene oxide resins
AssigneeGeneral Electric Company
InventorDwain M. White
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Abstract
A process for the reduction in the color of polyphenylene oxide resins comprising contacting the oxide resin with a phase transfer agent and a dithionite or a thiosulfate reducing agent. The resulting polyphenylene oxide resins which are substantially free of color can be used to prepare improved molded, calendered, or extruded articles, films, coatings, threads, filaments, tapes and the like.
Claims14
The process comprising contacting polyphenylene oxide with a phase transfer agent having a cation portion selected from the group consisting of quaternary ammonium, quaternary phosphonium, and tertiary sulfonium ions or mixtures thereof and a reducing agent having an anion portion selected from the group consisting of a dithionite [S.sub.2 O.sub.4 ].sup.32 ion, a dithiosulfate [S.sub.2 O.sub.6 ].sup.= ion, or mixtures thereof.
The process comprising contacting polyphenylene oxide with a phase transfer agent having a cation portion selected from the group consisting of quaternary ammonium, quaternary phosphonium, and tertiary sulfonium ions or mixtures thereof and a reducing agent having an anion portion selected from the group consisting of a dithinite [S.sub.2 O.sub.4 ].sup.= ion, a dithiosulfate [S.sub.2 O.sub.6 = ion, or mixtures thereof, said contacting being carried out at a temperature lower than 100.degree. C. and in the presence of a hydrogen donor.
Dependencies are inferred from the claim text.