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

045227950

ABSTRACT:
Linear phosphonitrilic chloride polymers are produced from phosphonitrilic chloride oligomers by means of a two-stage process. In the first stage 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 an intermediate reaction product. In the second stage the molecular weight of the reaction product is increased by heating the product to a higher temperature than the average temperature used in the first stage. Cyclic phosphonitrilic chloride oligomer may be present in the initial oligomer. Preferably, cyclic phosphonitrilic chloride oligomer is recovered from the reaction mixture after the start of the second stage. Most preferably it is recovered after completion of the second stage. At least a portion of the recovered cyclic oligomer may be used in a subsequent first stage 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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