Claims
- 1. A process for the preparation of hydroxygallium phthalocyanines Type A, Type B, Type C, or Type D, which comprises contacting Type V hydroxygallium phthalocyanine with an alcohol.
- 2. A process in accordance with claim 1 wherein the alcohol is an aliphatic alcohol with from 1 to about 6 carbon atoms.
- 3. A process in accordance with claim 1 wherein the alcohol is methanol.
- 4. A process in accordance with claim 1 wherein the alcohol is ethanol, or propanol.
- 5. A process in accordance with claim 1 wherein the alcohol is butanol.
- 6. A process in accordance with claim 2 wherein the contacting is for a period of from about 1 to about 336 hours.
- 7. A process in accordance with claim 3 wherein the contacting is for a period of from about 1 to about 336 hours.
- 8. A process in accordance with claim 4 wherein the contacting is for a period of from about 1 to about 336 hours.
- 9. A process in accordance with claim 5 wherein the contacting is for a period of from about 1 to about 336 hours.
- 10. A process in accordance with claim 1 wherein the weight ratio of Type V to alcohol solvent selected is from about 1 to about 50 weight percent.
- 11. A process in accordance with claim 1 wherein the contacting is by mixing, milling, paint shaking, or kneading.
- 12. A process in accordance with claim 3 wherein the hydroxygallium phthalocyanine Type A obtained has major peaks, as measured with an X-ray diffractometer, at Bragg angles 2.THETA. 6.9.degree., 7.7.degree., 8.4.degree., 12.0.degree., 13.2.degree., 24.3.degree., 26.6.degree. and 27.5.degree..
- 13. A process in accordance with claim 3 wherein the hydroxygallium phthalocyanine Type B obtained has major peaks, as measured with an X-ray diffractometer, at Bragg angles 2.THETA. 7.4.degree., 8.2.degree., 9.9.degree., 12.4.degree., 16.4.degree., 18.5.degree., 22.3.degree., 24.6.degree., 26.1.degree. and 28.3.degree..
- 14. A process in accordance with claim 5 wherein the hydroxygallium phthalocyanine Type C obtained has major peaks, as measured with an X-ray diffractometer, at Bragg angles 2.THETA. 7.3.degree., 8.1.degree., 9.9.degree., 12.4.degree., 22.3.degree., 25.1.degree. and 28.2.
- 15. A process in accordance with claim 5 wherein the hydroxygallium phthalocyanine Type D obtained has major peaks, as measured with an X-ray diffractometer, at Bragg angles 2.THETA. 7.1.degree., 7.4.degree., 9.1.degree., 9.9.degree., 12.4.degree., 18.5.degree., 22.2.degree., 25.0.degree., 26.2.degree., and 28.2.degree..
- 16. A process in accordance with claim 1 wherein the alcohol is isopropanol.
- 17. A process in accordance with claim 1 wherein the alcohol is 1-butanol.
- 18. A process in accordance with claim 1 wherein the contacting is for a period of from about 1 to about 144 hours.
- 19. A process for the preparation of hydroxygallium phthalocyanine Type A, Type B, Type C, or Type D, which comprises mixing Type V hydroxygallium phthalocyanine with an aliphatic alcohol and wherein the Type V selected is prepared by the reaction of a gallium trichloride (GaCl.sub.3) sodium methoxide solution, and o-phthalodinitrile in a solvent to obtain the precursor alkoxy-bridged gallium phthalocyanine dimer; hydrolyzing the precursor by dissolving it in a strong acid and then reprecipitating the dissolved pigment in aqueous ammonia, thereby forming Type I hydroxygallium phthalocyanine; and ballmilling the hydroxygallium phthalocyanine Type I to provide Type V hydroxygallium phthalocyanine.
- 20. A process in accordance with claim 19 wherein the solvent for the reaction of a gallium trichloride (GaCl.sub.3) sodium methoxide solution and o-phthalodinitrile is toluene; washing, or azeotropically drying the formed Type I to remove contaminants; followed by treating the Type I either by ball milling or by stirring in dimethylformamide (DMF) with a hydrophobic solvent of hexane, and heating to azeotropically remove water; and the strong acid is sulfuric acid.
- 21. A process in accordance with claim 19 wherein the ballmilling of the hydroxygallium phthalocyanine Type I is accomplished in the presence of dimethylformamide.
- 22. A process in accordance with claim 1 wherein the Type V selected is prepared by the reaction of a gallium trichloride (GaCl.sub.3) sodium methoxide solution, and o-phthalodinitrile in a solvent to obtain the precursor alkoxy-bridged gallium phthalocyanine dimer; hydrolyzing the precursor by dissolving it in a strong acid and then reprecipitating the dissolved hydroxygallium phthalocyanine pigment in aqueous ammonia, thereby forming Type I hydroxygallium phthalocyanine; and ballmilling the hydroxygallium phthalocyanine Type I to provide Type V hydroxygallium phthalocyanine.
Parent Case Info
This is a division, of application Ser. No. 413,554, filed Mar. 30, 1995 U.S. Pat. No. 5,567,558.
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Divisions (1)
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Number |
Date |
Country |
Parent |
413554 |
Mar 1995 |
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