Phosphonitrilic chloride polymers

Details Phosphonitrilic chloride polymers Phosphonitrilic chloride polymers

1983-04-22

1985-06-11

Doll, John

Chemistry of inorganic compounds

Phosphorus or compound thereof

Halogen containing

C01B 2510

Patent

active

045227969

ABSTRACT:
Linear phosphonitrilic chloride polymers are produced from phosphonitrilic chloride oligomers by means of an improved process wherein a mixture of phosphonitrilic chloride oligomers enriched in linear oligomer is heated with at least a stoichiometric amount (and preferably an excess) of ammonia or ammonium chloride while concurrently removing hydrogen chloride to produce a higher molecular weight polyphosphonitrilic chloride product. Cyclic phosphonitrilic chloride oligomer may be and preferably is present in the initial oligomer. Preferably, cyclic phosphonitrilic chloride oligomer is recovered from the reaction mixture during (but more preferably after) completion of the polymerization reaction. At least a portion of the recovered cyclic oligomer may be used in a subsequent polymerization reaction.

REFERENCES:
patent: 3443913 (1969-05-01), Bieniek et al.
patent: 3545942 (1970-12-01), Rice et al.
patent: 4374815 (1983-02-01), Li
Lund et al., J. Chem. Soc. (1960), 2542-2547.

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