Abstract: A composition which contains a 2-halo-2-halomethyl glutaronitrile and a 4,5-polymethylene-4-isothiazolin-3-one. The compositions exhibit anti-microbial activity and certain combinations of isothiazolinones together with the glutaronitrile are surprisingly effective against both bacteria and fungi.

Abstract: A composition comprising (a) a metal salt or complex with an organic compound of the general formula ##STR1## and (b) an oxy-phosphorus compound where W may be --SH or an optionally substituted hydrocarbyl group, Q is --OH, hydrogen or optionally substituted hydrocarbyl and Z is hydrogen or optionally substituted hydrocarbyl and Q and Z or Z and W may complete a ring. The compounds are typically metal complexes of thiohydroxamic acids or dithiocarbamates. The metal is typically zinc. The compositions exhibit improved aqueous solubility compared with the metal complexes alone, and can be used as industrial biocides, especially fungicides and particularly in paint films and latices.

Abstract: A composition which contains a 4,5-polymethylene-4-isothiazolin-3-one and a salt or complex of 2-mercaptopyridine-1-oxide with a metal which is at least divalent. The salt or complex is typically zinc 2-thiopyridine-1-oxide. The compositions exhibit anti-microbial activity and certain combinations of isothiazolinones together with zinc 2-thiopyridine-1-oxide are surprisingly effective against both bacteria and fungi.

Abstract: A composition which contains a 2-halo-2-halomethyl glutaronitrile and a 4,5-polymethylene-4-isothiazolin-3-one. The compositions exhibit anti-microbial activity and certain combinations of isothiazolinones together with the glutaronitrile are surprisingly effective against both bacteria and fungi.

Abstract: A composition comprises an isothiazolinone or an isothiazolothione and a substituted urea or a halogen-containing aromatic alkyl sulphoxide or sulphone. The isothiazolinone derivative can be 1,2-benzisothiazolin-3-one. The substituted urea may be 3-(3,4-dichlorophenyl)-1-1-dimethylurea. The sulphoxide or sulphone may be a sulphone derivative such as di-iodomethyl-4-methylphenyl sulphone. A useful composition comprises 1,2-benzisothiazolin-3-one and the specified urea or sulphone derivative. The composition may include other materials including other compounds having anti-microbial properties.