FIELD: chemistry.
SUBSTANCE: invention relates to biocides. The synergetic antimicrobial composition contains: (a) a hydroxymethyl-substituted phosphorus compound, which is a tetrakis(hydroxymethyl)phosphonium salt, and (b) a second biocide selected from a group comprising (1) hexahydro-1,3,5-tris(2-hydroxyethyl)-s-triazine, (2) 2,6-dimethyl-1,3-dioxan-4-ylacetate and (3) ortho-phenylphenol or alkali metal salts or ammonium salts thereof. The weight ratio of the hydroxymethyl-substituted phosphorus compound to hexahydro-1,3,5-tris(2-hydroxyethyl)-s-triazine ranges from 15:1 to 1:15. The weight ratio of the hydroxymethyl-substituted phosphorus to 2,6-dimethyl-1,3-dioxan-4-ylacetate ranges from 15:1 to 1:15. The weight ratio of hydroxymethyl-substituted phosphorus compound to ortho-phenylphenol or alkali metal salts or ammonium salts thereof ranges from 15:1 to 1:5.
EFFECT: invention increases effectiveness of the composition.
7 cl, 6 tbl, 6 ex
