Patent
Preparation of polysulfide
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TLDR
In this article, the polycondensation of an alkali metal sulfide with a dihalide compd. in the presence of a specific quaternary ammonium salt is discussed.Abstract:
PURPOSE: To increase intrinsic viscosity, decrease reaction time, and improve mechanical strengths by conducting the polycondensation of an alkali metal sulfide with a dihalide compd. in the presence of a specific quaternary ammonium salt. CONSTITUTION: An alkali metal sulfide (e.g. sodium sulfide nona-hydrate) and a dihalide compd. of formula I (wherein R 5 and R 6 are each H or a hydrocarbon group; and R 7 is a direct bond or a hydrocarbon group) (e.g. 1,6-dibromohexane) are polycondensed in the presence of a phase transfer catalyst comprising a quaternary ammonium salt of formula II (wherein R 1 to R 4 are each an aliph. alkyl group provided that at least two of them are 6C or higher alkyl) (e.g. trioctylmethylammonium chloride) in a solvent at 50-150°C. COPYRIGHT: (C)1992,JPO&Japioread more
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