Phosphate salts of monomers for pbz and their use in...

C - Chemistry – Metallurgy – 07 – C

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402/171, 260/598

C07C 215/80 (2006.01) C07C 323/34 (2006.01) C08G 73/18 (2006.01) C08L 79/04 (2006.01)

Patent

CA 2014995

ABSTRACT PBZ polymers are synthesized by the reaction of AA- and BB-monomers. The BB-monomer is conveniently synthesized and isolated as a phosphate salt having a uniform number of phosphate ions associated with each BB-monomer ion. Such high purity monophosphate and diphosphate salts can be obtained by precipitating the monomer from an aqueous acid solution by adjusting the pH balance or from a mixture of phosphoric acid and a volatile, polar, saturated organic liquid at a rela- tively low temperature. 37,500-F

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