Process for the polymerization of cyclic polyhalophosphazenes us

Details Process for the polymerization of cyclic polyhalophosphazenes us Process for the polymerization of cyclic polyhalophosphazenes us

1979-09-19

1980-10-07

Langel, Wayne A.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Halogen containing

C01B 2510

Patent

active

042268400

ABSTRACT:
Linear polydihalophosphazene polymers which are substantially free of gel are prepared by thermally polymerizing a cyclic polyhalophosphazene represented by the formula (NPX.sub.2).sub.3, wherein X is fluorine, chlorine or bromine in the presence of a catalyst which comprises the reaction product of a boron trihalide compound with an oxygenated phosphorus compound.
In addition to producing substantially gel free polymers, the catalyst composition of the process of the invention permits improved control of molecular weight, lower polymerization temperature, high rates of conversion of (NPCl.sub.2).sub.3 to (NPCl.sub.2).sub.n and provides for more readily processible and derivatizable polymers.

REFERENCES:
patent: 4123503 (1978-10-01), Snyder et al.
patent: 4139598 (1979-02-01), Reynard et al.
patent: 4157425 (1979-06-01), Dieck et al.

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