Preparation of titanyl fluorophthalocyanines
AssigneeEastman Kodak Company
InventorsMichel F. Molaire, Jeanne E. Kaeding, William T. Gruenbaum
Life of this patent
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Abstract
Titanyl fluorophthalocyanines, and electrophotographic elements, and a method for preparing titanyl fluorophthalocyanine having the steps of: dissolving titanyl fluorophthalocyanine in acid to form a solution; admixing the solution and water to precipitate out amorphous titanyl fluorophthalocyanine; washing the amorphous titanyl fluorophthalocyanine until substantially all of the acid is removed; and retaining the amorphous titanyl fluorophthalocyanine under ambient conditions of wetness/dryness and temperature exclusive of conditions combining both dryness and a temperature of greater than about 50.degree. C.
Claims20
A method for preparing a high crystallinity titanyl fluorophthalocyanine, said method comprising the steps of
- dissolving titanyl fluorophthalocyanine in acid to form a solution;
- admixing said solution and water, said admixing resulting in precipitation of amorphous titanyl fluorophthalocyanine;
- washing said amorphous titanyl fluorophthalocyanine until substantially all of said acid is removed;
- contacting said amorphous titanyl fluorophthalocyanine with an organic solvent, said contacting resulting in conversion of said amorphous titanyl fluorophthalocyanine to high crystallinity titanyl fluorophthalocyanine;
- and
- retaining said amorphous titanyl fluorophthalocyanine in contact with water, continuously from said precipitation to said conversion.
A method for preparing a titanyl fluorophthalocyanine composition of matter, said method comprising the steps of
- dissolving titanyl fluorophthalocyanine in acid to form a solution;
- admixing said solution and water, said admixing resulting in precipitation of amorphous titanyl fluorophthalocyanine;
- washing said amorphous titanyl fluorophthalocyanine until substantially all of said acid is removed;
- and
- retaining said amorphous titanyl fluorophthalocyanine at a temperature of less than about 80.degree. C. during and subsequent to said admixing.
A method for preparing a titanyl fluorophthalocyanine composition comprising the steps of:
- dissolving titanyl fluorophthalocyanine in an acidic solvent to form a solution;
- admixing said solution and water to precipitate said dissolved titanyl fluorophthalocyanine as amorphous titanyl fluorophthalocyanine;
- washing said amorphous titanyl fluorophthalocyanine, to remove residual acid, until pH neutrality is substantially reached;
- contacting said amorphous titanyl fluorophthalocyanine with an organic solvent to convert said amorphous titanyl fluorophthalocyanine to highly crystalline titanyl fluorophthalocyanine;
- and
- retaining said amorphous titanyl fluorophthalocyanine both wet and at a temperature below 50.degree. C. during and after said admixing.
A titanyl fluorophthalocyanine having the structure:
- ##STR2## where each of k, l, m, and n is independently an integer from 0 to 4 and at least one of k, l, m, and n is an integer from 1 to 4;
- said titanyl fluorophthalocyanine having an X-ray diffraction spectrum that exhibits peaks of the Bragg angle 2.theta. with respect to X-rays of Cu K.alpha. at a wavelength of 1,541 .ANG. at 6.6, 13.4, 15.8, and 26.1.degree.;
- (all .+-.0.2.degree.).
A titanyl fluorophthalocyanine having the structure:
- ##STR3## where each of k, l, m, and n is independently an integer from 0 to 4 and at least one of k, l, m, and n is an integer from 1 to 4;
- said titanyl fluorophthalocyanine having an X-ray diffraction spectrum that exhibits peaks of the Bragg angle 2.theta. with respect to X-rays of Cu K.alpha. at a wavelength of 1.541 .ANG. at 7.2, 11.9, 13.4, 15.8, 23.4, 24.5, and 27.1.degree. (all .+-.0.2.degree.).
A titanyl fluorophthalocyanine having the structure:
- ##STR4## where each of k, l, m, and n is independently an integer from 0 to 4 and at least one of k, l, m, and n is an integer from 1 to 4;
- said titanyl fluorophthalocyanine having an X-ray diffraction spectrum that exhibits peaks of the Bragg angle 2.theta. with respect to X-rays of Cu K.alpha. at a wavelength of 1,541 .ANG. at 6.6, 9.3, 15.1, 23.7, 25.6, and 27.1.degree. (all .+-.0.2.degree.).
Dependencies are inferred from the claim text.