FIELD: polymer production. SUBSTANCE: title compound is prepared by transforming polyhexamethyleneguanidin chloride into free base and neutralizing the latter with phosphoric acid, the first step being accomplished from aqueous solution of polyhexamethyleneguanidin chloride involving electrodialysis removal of hydrochloric acid at current density 0.25-1.0 A/sq.dm and temperature 20-30 C. EFFECT: improved quality of product due to elimination of chlorides. 2 ex
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