Process for preparing and purifying alkoxyphosphazene polymer

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

C - Chemistry, Metallurgy

08

G

402/355, 260/496

C08G 79/04 (2006.01) C08G 79/02 (2006.01)

Patent

CA 1249295

-22- PROCESS FOR PREPARING AND PURIFYING ALKOXYPHOSPHAZENE POLYMER Abstract Of The Disclosure Alkoxyphosphazene polymer is prepared in a homogeneous system by admixing chloropolymer dissolved in cyclohexane or a mix of cyclohexane and C5-C7 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 cyclo- hexane (and/or C5-C7 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.

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