FIELD: chemical industry. SUBSTANCE: described is method of preparing disinfecting polyguanidine agent by polycondensation of guanidine hydrochloride with hexamethylene diamine to prepare polyhexamethylene guanidine. The resulting polyhexamethylene guanidine is alkylated with dodecyl chloride in ethyl alcohol in the presence of alkali at equimolar ratio of dodecyl chloride and alkali. EFFECT: improved hydrophobic properties of the desired product and greater disinfecting properties thereof. 2 tbl, 2 ex
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