Preparation and use of nanosize pigment compositions

Abstract

A mixture of an organic nanosize pigment comprising of from 50 to 99% by weight of the nanosize pigment and 1 to 50% by weight based of a low molecular weight naphthalene sulfonic acid formaldehyde polymer and its use as a particle growth and crystal phase director for the preparation of a direct pigmentary organic pigment or in pigment finishing.

1 . A composition comprising from 50 to 99% by weight of an organic pigment having an average particle size of from 1 to 100 nm and from 1 to 50% by weight of a naphthalene sulfonic acid formaldehyde polymer having an average molecular weight of from 400 to 10000.  
     
     
         2 . A composition according to  claim 1 , wherein the naphthalene sulfonic acid formaldehyde polymer has an average molecular weight of 400 to 3000.  
     
     
         3 . A composition of  claim 1 , wherein the pigment is selected from the group consisting of azo, azomethine, methine, anthraquinone, phthalocyanine, perinone, perylene, diketopyrrolopyrrole, thioindigo, thiazinindigo, dioxazine, iminoisoindoline, iminoisoindolinone, quinacridone, flavanthrone, indanthrone, anthrapyrimidine and quinophthalone pigments, and mixtures and solid solutions thereof.  
     
     
         4 . A composition of  claim 3 , wherein the pigment is selected from the group consisting of quinacridone, anthraquinone, phthalocyanine, perylene, dioxazine, imino isoindolinone, imino isoindoline, diketopyrrolopyrrole and indanthrone pigments and a mixture and solid solution thereof.  
     
     
         5 . A composition of  claim 4 , wherein the pigment is a quinacridone of formula  
       
         
           
           
               
               
           
         
       
       wherein A and D are independently of one another H, F, Cl, C 1 -C 3 alkyl or C 1 -C 3 alkoxy.  
     
     
         6 . A composition of  claim 4 , wherein the pigment is a binary or ternary solid solution of quinacridone and/or diketopyrrolopyrrole pigments.  
     
     
         7 . A composition according to  claim 1 , wherein the polymer has formula  
       
         
           
           
               
               
           
         
       
       wherein n is a number from 0 to 12.  
     
     
         8 . A composition according to  claim 7 , wherein the naphthalene sulfonic acid formaldehyde polymer comprises, as part of its backbone, 1-naphthalene sulfonic acid and/or 2-naphthalene sulfonic acid moieties.  
     
     
         9 . A composition according to  claim 8 , wherein the 1-naphthalene sulfonic acid and 2-naphthalene sulfonic acid moieties are in a 4:1 molar ratio.  
     
     
         10 - 21 . (canceled)  
     
     
         22 . A composition according to  claim 1 , wherein the organic pigment has an average particle size of from 1 to 50 nm.  
     
     
         23 . A composition according to  claim 1 , wherein the organic pigment has an average particle size of from 3 to 30 nm.  
     
     
         24 . A composition according to  claim 1 , wherein the naphthalene sulfonic acid formaldehyde polymer has an average molecular weight of 648 to 1532.  
     
     
         25 . A composition according to  claim 22 , wherein the naphthalene sulfonic acid formaldehyde polymer has an average molecular weight of 400 to 3000.  
     
     
         26 . A composition according to  claim 22 , wherein the naphthalene sulfonic acid formaldehyde polymer has an average molecular weight of 648 to 1532.  
     
     
         27 . A composition of  claim 22 , wherein the pigment is selected from the group consisting of azo, azomethine, methine, anthraquinone, phthalocyanine, perinone, perylene, diketopyrrolopyrrole, thioindigo, thiazinindigo, dioxazine, iminoisoindoline, iminoisoindolinone, quinacridone, flavanthrone, indanthrone, anthrapyrimidine and quinophthalone pigments, and mixtures and solid solutions thereof.  
     
     
         28 . A composition of  claim 23 , wherein the pigment is selected from the group consisting of azo, azomethine, methine, anthraquinone, phthalocyanine, perinone, perylene, diketopyrrolopyrrole, thioindigo, thiazinindigo, dioxazine, iminoisoindoline, iminoisoindolinone, quinacridone, flavanthrone, indanthrone, anthrapyrimidine and quinophthalone pigments, and mixtures and solid solutions thereof.  
     
     
         29 . A composition of  claim 24 , wherein the pigment is selected from the group consisting of azo, azomethine, methine, anthraquinone, phthalocyanine, perinone, perylene, diketopyrrolopyrrole, thioindigo, thiazinindigo, dioxazine, iminoisoindoline, iminoisoindolinone, quinacridone, flavanthrone, indanthrone, anthrapyrimidine and quinophthalone pigments, and mixtures and solid solutions thereof.  
     
     
         30 . A composition of  claim 25 , wherein the pigment is selected from the group consisting of azo, azomethine, methine, anthraquinone, phthalocyanine, perinone, perylene, diketopyrrolopyrrole, thioindigo, thiazinindigo, dioxazine, iminoisoindoline, iminoisoindolinone, quinacridone, flavanthrone, indanthrone, anthrapyrimidine and quinophthalone pigments, and mixtures and solid solutions thereof.  
     
     
         31 . A composition according to  claim 2 , wherein the organic pigment has an average particle size of from 3 to 30 nm.  
     
     
         32 . A composition of  claim 2 , wherein the pigment is selected from the group consisting of azo, azomethine, methine, anthraquinone, phthalocyanine, perinone, perylene, diketopyrrolopyrrole, thioindigo, thiazinindigo, dioxazine, iminoisoindoline, iminoisoindolinone, quinacridone, flavanthrone, indanthrone, anthrapyrimidine and quinophthalone pigments, and mixtures and solid solutions thereof.