Solution polymerization of cyclic dichlorophosphazene oligomers

Details Solution polymerization of cyclic dichlorophosphazene oligomers Solution polymerization of cyclic dichlorophosphazene oligomers

1980-08-04

1982-04-27

Vertiz, O. R.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Halogen containing

C01B 2510

Patent

active

043270646

ABSTRACT:
Substantially linear polydichlorophosphazene polymers having a degree of polymerization of from 20 to 50,000 are prepared by an improved solution polymerization process which involves the polymerization of substantially pure cyclic dichlorophosphazene oligomers represented by the formula (NPC1.sub.2).sub.n, in which n is from 3 to 7, in cycloaliphatic solvents in the presence of a boron trihalide catalyst or a complex of a boron trihalide with an oxygenated phosphorus compound.
The process provides for the production of substantially gel free linear polydichlorophosphazene polymer, improved polymerization rates and easier handling of the polymerizate for subsequent derivatization reactions.

REFERENCES:
patent: 4123503 (1978-10-01), Snyder et al.
patent: 4137330 (1979-01-01), Prichard et al.
patent: 4139598 (1979-02-01), Reynard et al.
patent: 4225567 (1980-09-01), Halasa et al.
patent: 4226840 (1980-10-01), Fieldhouse et al.
patent: 4242316 (1980-12-01), Sinclair

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