Dry solid microbiocidal compositions, methods of controlling microorganisms and of safening isothiazolone microbiocides

Claim 2

A microbiocidal article comprising: (a) particulate solid microbiocidal composition useful in aqueous systems comprising: (i) 0.1-70 weight %, based on total weight of said composition, of microbiocide having sufficient water-solubility to provide a microbiocidally-effective amount thereof; and (ii) 99.9-30 weight %, based on total weight of said composition, of inert, finely-divided water-insoluble solid carrier material; embedded in: (b) water-insoluble, high-melting solid binder.

Claim 3

An article according to claim 1 wherein said binder comprises material(s) having a melting point in the range 40° C to 200° C, for example paraffin wax, beeswax, and carnauba wax; fatty acids, alcohols, and esters; synthetic waxes, alcohols, and esters; polymeric materials including polyalkylene ethers, polyolefins, polyesters, polyamides, polyacrylates, polymethacrylates, and polyvinyl aromatic compounds; and mixtures thereof.

Claim 4

An article according to claim 1 or 2 wherein the said microbiocide comprises (i), microbiocidally-effective isothiazolone of the formula: wherein Y is an unsubstituted or substituted C 1 -C 18 alkyl group, an unsubstituted or substituted C 2 -C 18 alkenyl or alkynyl group, an unsubstituted or substituted C3-C12 cycloalkyl group, an unsubstituted or substituted aralkyl group of 6-10 carbon atoms, or an unsubstituted or substituted aryl group of 6-10 carbon atoms; R is hydrogen, halogen or a C l -C 4 alkyl group; R is hydrogen, halogen or a C l -C 4 alkyl group; or R and R can be taken together with the C=C bond of the isothiazolone ring to form an unsubstituted or substituted benzene ring; or at least one of said isothiazolones stabilized with at least one metal salt used in an amount of 1-60 weight %, based on weight of 3-isothiazolone and metal salt, said metal salt being represented by the formula: wherein M is a cation of a metal selected from sodium, potassium, calcium, magnesium, copper, iron, zinc, barium, manganese, silver, cobalt and nickel; X is an anion selected from chloride, bromide, iodide, sulfate, nitrate, nitrite, acetate, chlorate, perchlorate, bisulfate, bicarbonate, oxalate, maleate, p-toluenesulfonate, carbonate, and phosphate; and n is an integer for which the anion X satisfies the valence of the cation M; and, as said solid carrier material (ii), one or more of the following inert materials in finely-divided water-insoluble solid form: silicaceous diatomaceous earth, high water absorption capacity calcium silicate granular material, clays, charcoal, vermiculite, corn cobs, high purity silica and wood.

Claim 5

An article according to claim 3 wherein said composition (a) comprises (i) 1-35 weight %, based on total weight of said composition, of said isothiazolone having a water solubility of 1000 ppm or greater wherein Y is an unsubstituted or substituted C 1 -C 18 alkyl group or C 3 -C 12 cycloalkyl group; R is hydrogen or halogen; R is hydrogen or halogen; or R and R are taken together with the C=C bond of the 3-isothiazolone ring to form a benzene ring; or said isothiazolone stabilized with said metal salt; and (ii) 99-65 weight %, based on total weight of said composition, of silicaceous diatomaceous earth, high water absorption capacity calcium silicate granular material, and/or clay(s); as the solid carrier embedded in, as the high-melting solid binder, (b) paraffin wax, beeswax, and/or carnauba wax. 1

Claim 6

An article according to claim 4 wherein said composition (a) comprises (i) 2-25 weight %, based on total weight of said composition, of said isothiazolone wherein Y is methyl, R is hydrogen, and R is chlorine or said isothiazolone stabilized with Mg(NO 3 ) 2 or a mixture of Mg(NO 3 ) 2 and MgCl 2 ; and (ii) 98-75 weight % based on total weight of said composition, of silicaceous diatomaceous earth; and wherein said water-insoluble high-melting solid binder (b) is paraffin wax.

Claim 7

An article according to claim 4 or 5 wherein said composition (a) comprises (i), in combination with said water-soluble isothiazolone, isothiazolone having a room temperature water solubility less than 1000 ppm, usually about 500 ppm, wherein Y is n-octyl or t-octyl and R and R are each hydrogen, provided that the combined solubility remains at least 1000 ppm at room temperature or said combination of isothiazolones stabilized with Mg(N0 3 ) 2 or a mixture of Mg(NO 3 ) 2 and MgCl 2 , the combination comprising 2-25 weight %, based on total weight of said composition; and (ii) 98-75 weight %, based on total weight of said composition, of silicaceous diatomaceous earth; and wherein said water-insoluble, high-melting solid binder (b) is paraffin wax.

Claim 8

An article according to claim 6 wherein said composition (a) comprises (i) 2-25 weight %, based on total weight of said composition, of a mixture of said isothiazolones wherein (i') Y is methyl, R is hydrogen and R is chlorine and (ii') Y is methyl, R is hydrogen and R is hydrogen, or said mixture stabilized with Mg(N0 3 ) 2 or a mixture of Mg(NO 3 ) 2 and MgCl 2 .

Claim 10

A method according to claim 9 which comprises using the article in a metal-working fluid, swimming pool, water tower or toilet bowl or cistern.