Inkjet ink compositions

Abstract

Ink compositions and methods of using the same are disclosed. An example ink composition includes an inkjet vehicle, from about 0.1 wt % to about 10 wt % of one or more colorants, from about 0.01 wt % to about 10 wt % of a phosphate-containing anti-kogation agent, and from about 0.01 wt % to about 6 wt % of a water soluble component represented by formula (I).

What is claimed is: 
     
         1 . An inkjet ink composition comprising:
 a. an inkjet vehicle,   b. from about 0.1 to about 10 weight percentage colorants,   c. from about 0.01 to about 10 weight percentage of a phosphate-containing anti-kogation agent, and   d. from about 0.01 to about 6 weight percentage of a water soluble component represented by formula (I):   
       
         
           
           
               
               
           
         
       
       wherein R 1  and R 2  are independently C n H 2n  with n being from 1 to 5; wherein R 3  is H or C n H 2n+1  with n being from 1 to 4; wherein R 4  is H, COOH or C n H 2n+1  with n being from 1 to 4 and wherein R 5  is H, COOH, OH, H, C n H 2n COOH or C n H 2n+1  with n being from 1 to 4. 
     
     
         2 . The inkjet ink according to  claim 1  wherein, in the general formula (I), R 1  and R 2  are C n H 2n  with n being 1; wherein R 3  is H; wherein R 4  is COOH and wherein R 5  is C n H 2n COOH with n being 2. 
     
     
         3 . The inkjet ink according to  claim 1  wherein, in the general formula (I), R 1  and R 2  are C n H 2n  with n being 1; R 3  is H; R 4  is H and R 5  is C n H 2n OH with n being 1. 
     
     
         4 . The inkjet ink according to  claim 1  wherein, in the general formula (I), R 1  and R 2  are C n H 2n  with n being 1; R 3  is H; R 4  is C n H 2n+1  with n being 1 and R 5  is C n H 2n OH with n being 1. 
     
     
         5 . The inkjet ink according to  claim 1  wherein the water soluble component represented by formula (I), is present in an amount representing from about 0.10 to about 2 weight percentage by weight of the ink composition. 
     
     
         6 . The inkjet ink according to  claim 1  wherein the anti-kogation agents is a phosphate ester surfactant. 
     
     
         7 . The inkjet ink according to  claim 1  wherein the anti-kogation agents is a phosphate ester of a fatty alcohol alkoxylate surfactant. 
     
     
         8 . The inkjet ink according to  claim 1  wherein the anti-kogation agents is an ethoxylated mono-oleyl phosphate ester surfactant. 
     
     
         9 . The inkjet ink according to  claim 1  wherein one or more anti-kogation agents is selected from the group consisting of oleth-3 phosphate, oleth-10 phosphate, oleth-5 phosphate, dioleyl phosphate, ppg-5-ceteth-10 phosphate, C 9 -C 15  alkyl monophosphate, deceth-4 phosphate, and mixtures thereof. 
     
     
         10 . The inkjet ink according to  claim 1  wherein the one or more anti-kogation agents has the formula (II) wherein n is from 0 to 15: 
       
         
           
           
               
               
           
         
       
     
     
         11 . The inkjet ink of  claim 1 , wherein one or more anti-kogation agents is present in an amount representing from about 0.2 to about 3 weight percentage by weight of the ink composition. 
     
     
         12 . The inkjet ink according to  claim 1  wherein the one or more colorants is a pigment. 
     
     
         13 . The inkjet ink according to  claim 1  wherein the water soluble component represented by formula (I) is present in an amount representing from about 0.20 to about 2 weight percentage by weight of the ink composition. 
     
     
         14 . The inkjet ink according to  claim 1 , wherein one or more anti-kogation agents is oleth-3 phosphate. 
     
     
         15 . A method of inkjet printing over a prolonged period of time, comprising jetting an inkjet ink onto a media substrate, wherein said inkjet ink includes:
 a. an inkjet vehicle,   b. from about 0.1 to about 10 weight percentage of colorants,   c. from about 0.01 to about 10 weight percentage of a phosphate-containing anti-kogation agent, and   d. from about 0.01 to about 6 weight percentage of a water soluble component represented by formula (I):   
       
         
           
           
               
               
           
         
       
       wherein R 1  and R 2  are independently C n H 2n  with n being from 1 to 5; wherein R 3  is H or C n H 2n+1  with n being from 1 to 4; wherein R 4  is H, COOH or C n H 2n+1  with n being from 1 to 4 and wherein R 5  is H, COOH, OH, H, C n H 2n COOH or C n H 2n+1  with n being from 1 to 4.