Solid concentrate compositions containing zinc pyrithione

Abstract

The present invention relates to a solid concentrate composition comprising: (a) from 5% to 25% by weight of zinc pyrithione (ZPT); (b) from 8% to 85% by weight of at least one surfactant, preferably, wherein the solid concentrate composition has a penetration hardness of between 20 N and 50 N according to the test method as disclosed herein.

What is claimed is: 
     
         1 . A solid concentrate composition comprising:
 (a) from 5% to 25% by weight of a zinc pyrithione (ZPT); and   (b) from 8% to 85% by weight of at least one surfactant.   
     
     
         2 . The solid concentrate composition according to  claim 1 , wherein the solid concentrate composition has a penetration hardness of between 20 N and 50 N according to the test method as disclosed herein. 
     
     
         3 . The solid concentrate composition according to  claim 1 , comprising from 6% to 8% by weight of the ZPT. 
     
     
         4 . The solid concentrate composition according to  claim 1 , further comprising (c) from 1.4% to 15% by weight of a chelant, wherein the chelant has a log K ZnL  of greater than 2, wherein the log K ZnL  is the log of a conditional stability constant of the chelant with Zn calculated at pH 7, 25° C., 0.1 M NaCl. 
     
     
         5 . The solid concentrate composition according to  claim 1 , further comprising (c) from 1.4% to 15% by weight of a chelant and wherein the chelant is a metal phosphonate complex comprising one or more phosphonate chelants co-ordinately bonded to one or more metal ions. 
     
     
         6 . The solid concentrate composition according to  claim 1 , further comprising (c) from 1.4% to 15% by weight of a chelant and wherein the chelant is a metal-pyridine oxide complex that is co-ordinately bonded to a metal ion. 
     
     
         7 . The solid concentrate composition according to  claim 5 , wherein the metal is selected from the group consisting of iron, copper, and zinc. 
     
     
         8 . The solid concentrate composition according to  claim 7 , wherein the metal is zinc. 
     
     
         9 . The solid concentrate composition according to  claim 8 , wherein the phosphonate chelant comprises a zinc-phosphonate complex and wherein the molar ratio of zinc to the phosphonate chelant ranges from 2:1 and 4:1. 
     
     
         10 . The solid concentrate composition according to  claim 8 , wherein the chelant is a zinc-pyridine oxide complex and wherein the molar ratio of zinc to the zinc-pyridine oxide complex ranges from 5:1 to 1:5. 
     
     
         11 . The solid concentrate composition according to  claim 5 , wherein the one or more phosphonate chelants each comprises one or more functional groups of the formula (I): 
       
         
           
           
               
               
           
         
         wherein R 1  is a linear, branched or cyclic, saturated or unsaturated, substituted or unsubstituted C 1 -C 20  hydrocarbon group, and wherein R 2  and R 3  are independently selected from the group consisting of hydrogen and R 1 . 
       
     
     
         12 . The solid concentrate composition according to  claim 11 , wherein the one or more phosphonate chelants are selected from the group consisting of 2-aminoethyl phosphoric acid (AEP), N-phosphonomethyl aminodiacetic acid (PMIDA), 1-hydroxyethane-1,1-diphosphonic acid (HEDP), amino tris(methylene phosphonic acid) (ATMP), ethylenediamine tetra(methylene phosphonic acid) (EDTMP), diethylenetriamine penta(methylene phosphonic acid) (DTPMP), phytic acid, nitrilotrimethylene phosphonic acid (NTP), and combinations thereof. 
     
     
         13 . The solid concentrate composition according to  claim 12 , wherein the one or more phosphonate chelants comprise HEDP. 
     
     
         14 . The solid concentrate composition according to  claim 1 , having a pH value ranging from 9 to 11 when dispersed in a 1 wt % aqueous solution. 
     
     
         15 . The solid concentrate composition of  claim 14 , wherein the composition comprises a C 6 -C 22  fatty acid, C 8 -C 22  fatty alcohol, or mixtures thereof. 
     
     
         16 . The solid concentrate composition according to  claim 1 , having a pH value ranging from 4 to 9 when dispersed in a 1 wt % aqueous solution. 
     
     
         17 . The concentrate composition according to  claim 16 , wherein the composition further comprises a C 8 -C 18  fatty acid, C 8 -C 20  fatty alcohol or mixtures thereof. 
     
     
         18 . The solid concentrate composition according to  claim 1 , wherein the surfactant is selected from the group consisting of primary alcohol sulfates, alpha olefin sulfonates, acyl isethionates and mixtures thereof. 
     
     
         19 . The solid concentrate composition of  claim 1 , wherein the ZPT has a particle size of less than 10 microns. 
     
     
         20 . The solid concentrate composition according to  claim 6 , wherein the metal is selected from the group consisting of iron, copper, and zinc.