Enclosed bleach activators

Abstract

The aim of the invention is to improve the stability in storage of bleach activators of the quaternized amino alkyl nitrile type. To this end, the invention provides that a particle containing these bleach activators is enclosed in the most complete possible manner by an enclosing material.

1 - 14 . (canceled)  
     
     
         15 . A method for producing particles containing bleach activator according to formula (I):  
       
         
           
           
               
               
           
         
       
       wherein R 1  is —H, —CH 3 , a C 2-24 -alkyl or -alkenyl radical, a substituted C 2-24 -alkyl or -alkenyl radical having at least one substituent from the group —Cl, —Br, —OH, —NH 2 , —CN, an alkyl- or alkenylaryl radical with a C 1-24 -alkyl group, or a substituted alkyl- or alkenylaryl radical with a C 1-24 -alkyl group and at least one other substituent on the aromatic ring, R 2  and R 3 , independently of one another, are —CH 2 —CN, —CH 3 , —CH 2 —CH 3 , —CH 2 —CH 2 —CH 3 , —CH(CH 3 )—CH 3 , —CH 2 —OH, —CH 2 -CH 2 —OH, —CH(OH)—CH 3 , —CH 2 —CH 2 —CH 2 —OH, —CH 2 —CH(OH)—CH 3 , —CH(OH)—CH 2 —CH 3 , —(CH 2 CH 2 —-O) n H, n=1, 2, 3, 4, 5 or 6, R 4  and R 5 , independently of one another, have the meanings of R 1 , R 2 , or R 3 , and X is a charge-balancing anion, the bleach activator according to formula I) being in solid, particulate form, said bleach activator particles optionally comprising a binder, filler, or mixture thereof, said method comprising the steps of spraying the particles of bleach activator with a liquid coating material, while keeping the particles in motion, until the particles are effectively covered.  
     
     
         16 . The method of  claim 15 , carried out in a fluidized bed, a mixer, or a granulator.  
     
     
         17 . The method of  claim 15 , wherein the coating material comprises a material selected from the group consisting of alkali metal sulfates, alkali metal chlorides, alkali metal silicates, alkali metal phosphates, alkali metal phosphonates, alkaline earth metal sulfates, alkaline earth metal silicates, paraffin waxes, water-soluble saccharide-based polymeric compounds, starch, starch derivatives, cellulose, cellulose derivatives, polyvinyl alcohols and polyethylene glycols, homo- and copolymeric polycarboxylates, polyesters of dicarboxylic acids and optionally oligoalcohols, nonionic surfactants, anionic surfactants, glycolic acid, citric acid, and mixtures thereof.  
     
     
         18 . The method of  claim 15 , wherein the coating material is selected from the group consisting of inorganic salts, paraffin waxes, water-soluble saccharide based polymeric compounds, starch, starch derivatives, cellulose, cellulose derivatives, polymeric alcohols, oligoalcohols, nonionic surfactants, anionic surfactants, hydroxy carboxylic acids, fatty acids, and mixtures thereof.  
     
     
         19 . The method of  claim 16 , wherein the liquid coating material is a solution or a pumpable and sprayable slurry.  
     
     
         20 . The method of  claim 19 , wherein the liquid of the coating material is at least partially removed during or subsequent to the spraying step by a drying step.  
     
     
         21 . The method of  claim 15 , wherein the coating material is liquefied by heating and the coated bleach activator particles are cooled to below the melting point or the softening point of the coating material and granulated.  
     
     
         22 . The method of  claim 21 , wherein the coating material comprises wax, polyester, or fatty acid.  
     
     
         23 . The method of  claim 22 , wherein the coating material comprises stearic acid.  
     
     
         24 . A particle comprising bleach activator or activators of the formula (I):  
       
         
           
           
               
               
           
         
       
       wherein R 1  is —H, —CH 3 , a C 2-24 -alkyl or - alkenyl radical, a substituted C 2-24 -alkyl or -alkenyl radical having at least one substituent from the group —Cl, —Br, —OH, —NH 2 , —CN, an alkyl- or alkenylaryl radical with a C 1-24 -alkyl group, or a substituted alkyl- or alkenylaryl radical with a C 1-24 -alkyl group and at least one other substituent on the aromatic ring, R 2  and R 3 , independently of one another, are —CH 2 —CN, —CH 3 , —CH 2 —CH 3 , —CH 2 —CH 2 —CH 3 , —CH(CH 3 )—CH 3 , —CH 2 —OH, —CH 2 —CH 2 —OH, —CH(OH)—CH 3 , —CH 2 —CH 3 —CH 2 —OH, —CH 2 —CH(OH)—CH 3 , —CH(OH)—CH 2 —CH 3 , or —(CH 2 CH 2 —O) n H, n=1, 2, 3, 4, 5 or 6, R 4  and R 5 , independently of one another, have the meanings of R 1 , R 2  or R 3 , and X is a charge-balancing anion, and wherein the bleach activator or activators are enclosed in the most complete manner possible by a coating material.  
     
     
         25 . The particle of  claim 24 , comprising at least 40% by weight of the bleach activator or activators according to formula (I) and up to 60% by weight of the coating material.  
     
     
         26 . The particle of  claim 25 , comprising from 50% by weight to 92% by weight of the bleach activator or activators according to formula (I) and from 8% by weight to 50% by weight of the coating material.  
     
     
         27 . The particle of  claim 25 , comprising from 10% by weight to 25% by weight of the coating material.  
     
     
         28 . The particle of  claim 24 , wherein R 1 , R 2  and R 3  are identical.  
     
     
         29 . The particle of  claim 28 , wherein R 1 , R 2  and R 3  are methyl groups.  
     
     
         30 . The particle of  claim 24 , wherein among R 1 , R 2  and R 3 , at least 1 or 2 are methyl groups, and the other or others have two or more carbon atoms.  
     
     
         31 . The particle of  claim 24 , wherein the anion X −  is selected from the group consisting of chloride, fluoride, iodide, bromide, nitrate, hydroxide, phosphate, hydrogen phosphate, dihydrogen phosphate, pyrophosphate, metaphosphate, hexafluorophosphate, carbonate, hydrogen carbonate, sulfate, hydrogen sulfate, C 1 20 -alkyl sulfate, C 1-20 -alkylsulfonate, optionally C 1-18 -alkyl-substituted arylsulfonate, chlorate, perchlorate, acetate, laurate, benzoate, citrate, formate, and mixtures thereof.  
     
     
         32 . The particle of  claim 24 , wherein the anion X −  is selected from the group consisting of halides, anions of C 1-24 -carboxylic acids, and mixtures thereof.