Production of high molecular weight, essentially uncrosslinked p

Details Production of high molecular weight, essentially uncrosslinked p Production of high molecular weight, essentially uncrosslinked p

1990-05-21

1992-10-06

Langel, Wayne

Chemistry of inorganic compounds

Phosphorus or compound thereof

Halogen containing

366320, 422135, C01B 2510

Patent

active

051529718

ABSTRACT:
High molecular weight, essentially uncrosslinked polychlorophosphazenes are prepared by bulk polycondensing a monomer of the formula P.sub.2 NXCl.sub.2, in which X is an oxygen or sulfur atom, e.g., N-dichlorophosphoryl- or N-dichlorothiophosphoryl-P-trichlorophosphazene, and wherein at least that final stage of polycondensation following cessation of evolution of PXCl.sub.3 is carried out in a stirred reaction zone, such stirred reaction zone including means to prevent the accumulation of polycondensate on the stirrer.

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C. K. Coyle et al, "Mixing in Viscous Liquids," AlChE Journal, vol. 16, No. 6 (Nov., 1970), pp. 903-906.

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