US2009186200A1PendingUtilityA1

2,5-di(methoxyanilino) terephthalic acid polymorphs and quinacridones realized therefrom

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Assignee: THOMPSON BRIANPriority: May 22, 2006Filed: May 21, 2007Published: Jul 23, 2009
Est. expiryMay 22, 2026(expired)· nominal 20-yr term from priority
Inventors:Brian ThompsonDaphne J. RiceTracie TibbsWengan WuJohn BritanakEdward Sung
C09D 7/41C09B 67/0027C07D 471/04C09B 48/00C07C 229/62C09D 11/037Y10T428/24802
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Claims

Abstract

2,5-di(p-methoxyanilino)terephthalic acid crystal types I and II are made by controlling the pH during the recovery of the oxidized product of the condensation of dimethylsuccinyl succinate with p-methoxyaniline. The resulting 2,5-di(p-methoxyanilino)-terephthalic acid can be converted into 2,9-dimethoxyquinacridone or a solid solution thereof having controlled characteristics.

Claims

exact text as granted — not AI-modified
1 . 2,5-di(p-methoxyanilino)terephthalic acid crystal type II. 
   
   
       2 . A method of producing 2,5-di(p-methoxyanilino)terephthalic acid crystal type II which comprises condensing dimethylsuccinyl succinate with p-methoxyaniline and adjusting the pH of the reaction mixture containing the condensation product to substantially immediately adjust the pH to below about 5. 
   
   
       3 . A method of producing 2,5-di(p-methoxyanilino)terephthalic acid crystal type II which comprises providing a solution of 2,5-di(p-methoxyanilino)terephthalic acid crystal type I having a basic pH and adjusting the pH of said solution to below about 5.5. 
   
   
       4 . A method of making 2,9-dimethoxyquinacridone or a solid solution thereof which comprises converting 2,5-di(p-methoxyanilino)terephthalic acid to said 2,9-dimethoxyquinacridone or a solid solution thereof, wherein the 2,5-di(p-methoxyanilino)terephthalic acid is 2,5-di(p-methoxyanilino)terephthalic acid crystal type II. 
   
   
       5 . 2,9-dimethoxyquinacridone produced by the process of  claim 4 . 
   
   
       6 . 2,9-dimethoxyquinacridone solid solution produced by the process of  claim 4 . 
   
   
       7 . An ink comprising a colorant and an ink carrier therefor in which the colorant is the product of the method of  claim 4 . 
   
   
       8 . The ink of  claim 7 , wherein the colorant is 2,9-dimethoxyquinacridone. 
   
   
       9 . The ink of  claim 7 , wherein the colorant is a solid solution of 2,9-dimethoxyquinacridone. 
   
   
       10 . An ink comprising a colorant and an ink carrier therefor in which the colorant is the product of the method of  claim 3 . 
   
   
       11 . The ink of  claim 10 , wherein the colorant is 2,9-dimethoxyquinacridone. 
   
   
       12 . The ink of  claim 10 , wherein the colorant is a solid solution of 2,9-dimethoxyquinacridone. 
   
   
       13 . A coating composition comprising a colorant and a coating composition carrier therefor in which the colorant is the product of the method of  claim 3 . 
   
   
       14 . The coating composition of  claim 13 , wherein the colorant is 2,9-dimethoxyquinacridone. 
   
   
       15 . The coating composition of  claim 13 , wherein the colorant is a solid solution of 2,9-dimethoxyquinacridone. 
   
   
       16 . A coating composition comprising a colorant and a coating composition carrier therefor in which the colorant is the product of the method of  claim 4 . 
   
   
       17 . The coating composition of  claim 16 , wherein the colorant is 2,9-dimethoxyquinacridone. 
   
   
       18 . The coating composition of  claim 16 , wherein the colorant is a solid solution of 2,9-dimethoxyquinacridone. 
   
   
       19 . A pigmented article comprising a mass containing a colorant in which the colorant is the product of the method of  claim 4 . 
   
   
       20 . The pigmented article of  claim 19 , wherein the colorant is 2,9-dimethoxyquinacridone. 
   
   
       21 . The pigmented article of  claim 19 , wherein the colorant is a solid solution of 2,9-dimethoxyquinacridone. 
   
   
       22 . A pigmented article comprising a mass containing a colorant in which the colorant is the product of the method of  claim 3 . 
   
   
       23 . The pigmented article of  claim 22 , wherein the colorant is 2,9-dimethoxyquinacridone. 
   
   
       24 . The pigmented article of  claim 22 , wherein the colorant is a solid solution of 2,9-dimethoxyquinacridone.

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