US2007021530A1PendingUtilityA1

Method of preparing pigment compositions

47
Individually held — no corporate assignee on recordPriority: Jul 22, 2005Filed: Jul 21, 2006Published: Jan 25, 2007
Est. expiryJul 22, 2025(expired)· nominal 20-yr term from priority
Inventors:Paul S. Palumbo
C09B 67/006C09D 11/32C09C 3/10C09D 17/00C09B 67/009C09D 11/322C09D 11/30C09D 11/326
47
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Claims

Abstract

The present invention relates to a method of preparing a pigment composition comprising the steps of combining a polymer and a pigment to form a mixture and heating the mixture to a temperature of between about 70° C. and 250° C. to form the pigment composition. The method may further comprise the step of dispersing the pigment composition in an aqueous medium to form an aqueous pigment dispersion. The pigment compositions and aqueous pigment compositions can be used in an inkjet ink composition, which is also disclosed.

Claims

exact text as granted — not AI-modified
1 . A method of preparing a pigment composition comprising the steps of: 
 i) combining a polymer comprising at least one ammonium salt of a carboxylic acid group and a pigment to form a mixture, and    ii) heating the mixture to a temperature of between about 70° C. and 250° C. to form the pigment composition.    
   
   
       2 . The method of  claim 1 , wherein the polymer is in the form of an aqueous polymer solution.  
   
   
       3 . The method of  claim 1 , wherein the pigment is in the form of an aqueous pigment suspension or dispersion.  
   
   
       4 . The method of  claim 1 , wherein the polymer and the pigment are combined under high intensity or high shear mixing conditions.  
   
   
       5 . The method of  claim 1 , wherein the pigment and the polymer are combined in a weight ratio of between 5:1 and 1:5 pigment to polymer.  
   
   
       6 . The method of  claim 5 , wherein the weight ratio is between 5:1 and 1:1 pigment to polymer.  
   
   
       7 . The method of  claim 1 , wherein the polymer comprises at least 10% by weight of at least one ammonium salt of a carboxylic acid group.  
   
   
       8 . The method of  claim 7 , wherein the polymer comprises at least 20% by weight of at least one ammonium salt of a carboxylic acid group.  
   
   
       9 . The method of  claim 7 , wherein the polymer comprises at least 30% by weight of at least one ammonium salt of a carboxylic acid group.  
   
   
       10 . The method of  claim 1 , wherein the polymer is an ammonium acrylate polymer or ammonium methacrylate polymer.  
   
   
       11 . The method of  claim 1 , wherein the polymer is a styrene-ammonium acrylate polymer or a styrene-ammonium methacrylate polymer.  
   
   
       12 . The method of  claim 1 , wherein the mixture is heated using a spray dryer.  
   
   
       13 . The method of  claim 1 , wherein the pigment comprises a blue pigment, a black pigment, a brown pigment, a cyan pigment, a green pigment, a white pigment, a violet pigment, a magenta pigment, a red pigment, a yellow pigment, or mixtures thereof.  
   
   
       14 . A method of preparing an aqueous pigment dispersion comprising the steps of: 
 i) combining a polymer comprising at least one ammonium salt of a carboxylic acid group and a pigment to form a mixture,    ii) heating the mixture to a temperature of between about 70° C. and 250° C. to form a pigment composition, and    iii) dispersing the pigment composition in an aqueous medium to form the aqueous pigment dispersion.    
   
   
       15 . The method of  claim 14 , wherein the pigment composition is dispersed under high shear mixing conditions.  
   
   
       16 . The method of  claim 14 , wherein the pigment composition is dispersed by addition of a base.  
   
   
       17 . An inkjet ink composition comprising a) a liquid vehicle and b) a pigment composition, wherein the pigment composition is prepared by a method comprising the steps of: 
 i) combining a polymer comprising at least one ammonium salt of a carboxylic acid group and a pigment to form a mixture, and    ii) heating the mixture to a temperature of between about 70° C. and 250° C. to form the pigment composition.    
   
   
       18 . The inkjet ink composition of  claim 17 , wherein the polymer is in the form of an aqueous polymer solution.  
   
   
       19 . The inkjet ink composition of  claim 17 , wherein the pigment is in the form of an aqueous pigment suspension or dispersion.  
   
   
       20 . The inkjet ink composition of  claim 17 , wherein the polymer and the pigment are combined under high intensity or high shear mixing conditions.  
   
   
       21 . The inkjet ink composition of  claim 17 , wherein the pigment and the polymer are combined in a weight ratio of between 5:1 and 1:5 pigment to polymer.  
   
   
       22 . The inkjet ink composition of  claim 21 , wherein the weight ratio is between 5:1 and 1:1 pigment to polymer.  
   
   
       23 . The inkjet ink composition of  claim 17 , wherein the polymer comprises at least 10% by weight of at least one ammonium salt of a carboxylic acid group.  
   
   
       24 . The inkjet ink composition of  claim 23 , wherein the polymer comprises at least 20% by weight of at least one ammonium salt of a carboxylic acid group.  
   
   
       25 . The inkjet ink composition of  claim 23 , wherein the polymer comprises at least 30% by weight of at least one ammonium salt of a carboxylic acid group.  
   
   
       26 . The inkjet ink composition of  claim 17 , wherein the polymer is an ammonium acrylate polymer or ammonium methacrylate polymer.  
   
   
       27 . The inkjet ink composition of  claim 17 , wherein the polymer is a styrene-ammonium acrylate polymer or a styrene-ammonium methacrylate polymer.  
   
   
       28 . The inkjet ink composition of  claim 17 , wherein the mixture is heated using a spray dryer.  
   
   
       29 . The inkjet ink composition of  claim 17 , wherein the pigment comprises a blue pigment, a black pigment, a brown pigment, a cyan pigment, a green pigment, a white pigment, a violet pigment, a magenta pigment, a red pigment, a yellow pigment, or mixtures thereof.  
   
   
       30 . The inkjet ink composition of  claim 17 , wherein the liquid vehicle is an aqueous vehicle.  
   
   
       31 . An inkjet ink composition comprising a) a liquid vehicle and b) an aqueous pigment dispersion, wherein the aqueous pigment dispersion is prepared by a method comprising the steps of: 
 i) combining a polymer comprising at least one ammonium salt of a carboxylic acid group and a pigment to form a mixture, and    ii) heating the mixture to a temperature of between about 70° C. and 250° C. to form a pigment composition comprising the polymer and the pigment, and    iii) dispersing the pigment composition in an aqueous medium to form the aqueous pigment dispersion.    
   
   
       32 . The inkjet ink composition of  claim 31 , wherein the pigment composition is dispersed under high shear mixing conditions.  
   
   
       33 . The inkjet ink composition of  claim 31 , wherein the pigment composition is dispersed by addition of a base.  
   
   
       34 . The inkjet ink composition of  claim 31 , wherein the liquid vehicle is an aqueous vehicle.

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