Process for preparing and purifying alkoxyphosphazene polymer

Details Process for preparing and purifying alkoxyphosphazene polymer Process for preparing and purifying alkoxyphosphazene polymer

1985-04-29

1986-09-02

Anderson, Harold D.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From phosphorus-containing reactant

524476, 524610, 528497, 528498, C08G 7904

Patent

active

046097244

ABSTRACT:
Alkoxyphosphazene polymer is prepared in a homogeneous system by admixing chloropolymer dissolved in cyclohexane or a mix of cyclohexane and C.sub.5 -C.sub.7 alkane with alkali metal alkoxide dissolved in tetrahydrofuran, reacting, desalting the resulting reaction solution and concentrating by a first step involving admixing non-solvent which is cyclohexane (and/or C.sub.5 -C.sub.7 alkane if that is also present in the reaction solution) to cause coagulation thereby forming a higher viscosity rubber phase enriched in polymer and a lower viscosity liquid phase depleted in polymer and separating the rubber and liquid phases and a second step involving evaporating the residual solvent and non-solvent. The first concentrating step is preferably carried out utilizing an extruder.

REFERENCES:
patent: 3972841 (1976-08-01), Cheng et al.
patent: 4128710 (1978-12-01), Fieldhouse et al.
patent: 4129529 (1978-12-01), Fieldhouse et al.
patent: 4237263 (1980-12-01), Allcock et al.
patent: 4357458 (1982-11-01), Antkowiak et al.
patent: 4477656 (1984-10-01), Longo et al.

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