Stable Nonaqueous Bleaching Detergent Composition Dispersion

Abstract

The invention pertains to a nonaqueous bleaching detergent composition comprising: a) a solid bleaching agent in an amount from 20% to 85% by weight, said solid bleaching agent being a hypochlorite-liberating agent, b) a thickening agent in an amount from 0.1 to 10% by weight, wherein the thickening agent is a mixture of clay and polymer in a ratio of clay:polymer of 1:10 to 10:1, c) a thickening agent activator in an amount of up to 0.3% by weight, d) an auxiliary compound in an amount from 0 to 23% by weight, and e) a nonaqueous liquid in an amount of at least 14.9% by weight which is chemically inert to the bleaching agent and wherein the solubility of the bleaching agent is less than 10 mg/l, said nonaqueous liquid being selected from vegetable oils, mineral oils, synthetic oils, or animal oils including fish oils, and admixtures thereof.

1 . A nonaqueous bleaching detergent composition comprising a dispersion of:
 a) a solid bleaching agent in an amount from 20% to 85% by weight, said solid bleaching agent being a hypochlorite-liberating agent,   b) a thickening agent in an amount from 0.1 to 10% by weight, wherein the thickening agent is a mixture of clay and polymer in a ratio of clay:polymer of 1:10 to 10:1,   c) a thickening agent activator in an amount of 0 to 0.3% by weight,   d) an auxiliary compound in an amount from 0 to 23% by weight, and   e) a nonaqueous liquid in an amount of at least 14.9% by weight which is chemically inert to the bleaching agent and wherein the solubility of the bleaching agent is less than 10 mg/l, said nonaqueous liquid being selected from vegetable oils, mineral oils, synthetic oils, or animal oils including fish oils, and admixtures thereof.   
     
     
         2 . The bleaching detergent composition of  claim 1  wherein the bleaching agent is selected from a salt of dihaloisocyanurate, trihaloisocyanurate, chloramine-T, N-halosuccinimide, N-halomalonimide, N-halophthalimide, N-halonaphthalimide, 1,3-dihalo-5,5-dimethylhydantion; N-monohalo-C,C-dimethylhydantion; methylene-bis(N-halo-C,C-dimethylhydantoin); 1,3-dihalo-5-methyl-5-isobutylhydantoin; 1,3-dihalo-5-methyl-5-ethylhydantoin; 1,3-dihalo-5,5-diisobutylhydantoin; 1,3-dihalo-5-methyl-5-n-amylhydantoin; trihalomelamine, and mixtures thereof, wherein halo stands for chloro. 
     
     
         3 . The bleaching detergent composition of  claim 1  or  2  wherein the bleaching agent has a particle size less than 400 μm, preferably 10 to 200 μm, most preferably 30-110 μm. 
     
     
         4 . The bleaching detergent composition of any one of  claims 1  to  3  wherein said clay is organically modified smectite, organically modified bentonite, or synthetic hectorite. 
     
     
         5 . The bleaching detergent composition of any one of  claims 1  to  4  wherein said polymer is a block(co)polymer styrene/ethylene oxide/propylene oxide or triblockcopolymer styrene-ethylene/butylene-styrene. 
     
     
         6 . The bleaching detergent composition of any one of  claims 1  to  5  wherein the auxiliary compound is selected from surfactant, bleach activator, enzyme, colorant, perfume, phosphate, anti-foam agent, inorganic carbonate or hydrogen carbonate, gloss enhancer, sequestering agent, and nonaqueous builder, or mixtures thereof. 
     
     
         7 . The bleaching detergent composition of any one of  claims 1  to  6  which comprises 25 to 50%, preferably 35 to 45% by weight, of said bleaching agent. 
     
     
         8 . The bleaching detergent composition of any one of  claims 1  to  7  which comprises 0.1 to 6%, preferably 0.1 to 4%, more preferably 0.5 to 3% by weight, of said thickening agent. 
     
     
         9 . The bleaching detergent composition of  claim 1 - 8  wherein said thickening agent is in a ratio of clay:polymer of 1:3 to 2:1. 
     
     
         10 . The bleaching detergent composition of any one of  claims 1  to  9  wherein the nonaqueous liquid is paraffin oil. 
     
     
         11 . The bleaching detergent composition of any one of  claims 1  to  10  wherein the thickening agent activator is propylene carbonate. 
     
     
         12 . A closed package comprising the bleaching detergent composition of any one of  claims 1 - 11 . 
     
     
         13 . A method for preparing the bleaching detergent composition of any one of  claims 1 - 11 , comprising the steps:
 i) making at elevated temperature a pre-gel of a polymer and a nonaqueous liquid, which is chemically inert to the bleaching agent and wherein the solubility of the bleaching agent is less than 10 mg/l;   ii) making a pre-gel of a clay, the nonaqueous liquid, and, optionally, a thickening agent activator, in a high-shear mixer;   iii) adding under stirring the pre-gel of ii) to the pre-gel of i), and   iv) adding a solid bleaching agent, and, optionally, an auxiliary compound.