Solid biocide dry blend

Claim 1

A method of making a substantially non-dusting, free-flowing dry blend mixture comprising mixing: a. a porous thermoplastic resin powder having a porosity of at least about 0.10 cc/g as measured by the mercury intrusion method or about 30% as measured on a void volume basis having a particle size between about 40 and about 300 mesh, said resin being selected from the group consisting of polyvinyl chloride, polyethylene, polystyrene, polypropylene, nylon, styrene-butadiene copolymer, polycarbonate, polystyrene-polyphenylene oxide blend, polyphenylene oxide and an ethylene/acrylic acid salt ionomer; and b. from 1 to 80 weight percent, based on the weight of the composition, of a microbiocide selected from the group consisting of 10,10'-oxybisphenoxarsine; N-(trichloromethylthio)-4-cyclohexene-1,2-dicarboximide; 2,3,5-trichloro-4-propylsulfonyl pyridine; 2,3,4,5-tetrachloro-4-(methylsulfonyl)pyridine; zinc salt of 1-hydroxypyridine-2-thione; N-(trichloromethylthio)phthalimide; N-(2-methylnaphthyl)meleimide; cis-N-(1,1,2,2-tetrachlorethyl)-thio-4-cyclohexene-1,2-dicarboximide; 1-isopropyl-3-methyl pyrazolyl-5-dimethyl carbamate; 3-methyl pyrazolyl dimethyl-carbamate; manganese ethylene bisdithiocarbamate; zinc ethylene bisdithiocarbamate; disodium ethylene bisdithiocarbamate; ferric dimethyl dithiocarbamate; zinc dimethyl dithiocarbamate; 2,4-dinitro-6-capryl phenol crotonate; p-chlorophenyl-p-chlorobenzene sulphonate; 2-N-octyl-4-isothiazolin-3-one; methyl(butyl carbamoyl)-2-benzimidazole carbamate; 2-(4-thiazolyl)benzimidazole; copper 8-hydroxyl-quinolinate; α-diethoxyphosphinodithioacetylurea; α-dimethoxylphosphinodithioacetylurea; diethoxyphosphinodithioacetamide; dimethoxyphosphinodithioacetamide; bis(dimethylamido)phosphoryl flouride; 2-cyclohexyl-3-isothiazolone; 4,5-dichloro-2-cyclohexyl-3-isothiazolone and tributyl tin fluoride, in a high intensity high shear mixing apparatus at a temperature sufficient to open the pores of the powder, and then cooling the mixture to obtain a free-flowing powder which contains the microbiocide at a concentration of at least about 20 times greater than the normal upper usage concentration of the microbiocide, the microbiocide being held within the pores of the thermoplastic resin powder.

Claim 2

A method of making a substantially non-dusting, free-flowing dry blend mixture comprising mixing: a. a porous thermoplastic resin powder having a porosity of at least about 0.10 cc/g as measured by the mercury intrusion method or about 30% as measured on a void volume basis having a particle size between about 40 and about 300 mesh, said resin being selected from the group consisting of polyvinyl chloride, polyethylene, polystyrene, polypropylene, nylon, styrene-butadiene copolymer, polycarbonate, polystyrene-polyphenylene oxide blend, polyphenylene oxide and an ethylene/acrylic acid salt ionomer; and b. from 1 to 80 weight percent, based on the weight of the composition, of a microbiocide selected from the group consisting of 10,10'-oxybisphenoxarsine; N-(trichloromethylthio)-4-cyclohexene-1,2-dicarboximide; 2,3,5-trichloro-4-propylsulfonyl pyridine; 2,3,4,5-tetrachloro-4-(methylsulfonyl)pyridine; zinc salt of 1-hydroxypyridine-2-thione; N-(trichloromethylthio)phthalimide; N-(2-methylnaphthyl)meleimide; cis-N-(1,1,2,2-tetrachlorethyl)-thio-4-cyclohexene-1,2-dicarboximide; 1-isopropyl-3-methyl pyrazolyl-5-dimethyl carbamate; 3-methyl pyrazolyl dimethyl-carbamate; manganese ethylene bisdithiocarbamate; zinc ethylene bisdithiocarbamate; disodium ethylene bisdithiocarbamate; ferric dimethyl dithiocarbamate; zinc dimethyl dithiocarbamate; 2,4-dinitro-6-capryl phenol crotonate; p-chlorophenyl-p-chlorobenzene sulphonate; 2-N-octyl-4-isothiazolin-3-one; methyl(butyl carbamoyl)-2-benzimidazole carbamate; 2-(4-thiazolyl)benzimidazole; copper 8-hydroxyl-quinolinate; α-diethoxyphosphinodithioacetylurea; α-dimethoxylphosphinodithioacetylurea; diethoxyphosphinodithioacetamide; dimethoxyphosphinodithioacetamide; bis(dimethylamido)phosphoryl flouride; 2-cyclohexyl-3-isothiazolone; 4,5-dichloro-2-cyclohexyl-3-isothiazolone and tributyl tin fluoride, in a high intensity high shear mixing apparatus at a temperature sufficient to open the pores of the powder, and then cooling the mixture to obtain a free-flowing powder which contains the microbiocide at a concentration of at least about 20 times greater than the normal upper usage concentration of the microbiocide, the microbiocide being held within the pores of the thermoplastic resin powder.