Method for producing α-form titanylphthalocyanine and...

Details Method for producing α-form titanylphthalocyanine and... Method for producing α-form titanylphthalocyanine and...

2008-07-22

2011-11-08

Wilson, James O (Department: 1624)

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

Reexamination Certificate

active

08053570

ABSTRACT:
The present invention relates to a method for producing an α-form titanylphthalocyanine represented by the formula (1):which has a peak at a Bragg angle (2θ±0.2°) in X-ray diffraction spectrum with CuK α-ray: 7.5°, 10.2°, 12.6°, 13.2°, 15.1°, 16.3°, 17.3°, 18.3°, 22.5°, 24.2°, 25.3° and 28.6°, wherein the method includes steps of:(I) subjecting a crude titanylphthalocyanine having an α-form polymorph to an acid pasting treatment, and then filtering and washing with water to give a water-containing wet cake, and then subjecting the wet cake to drying and crushing to give a low crystalline titanylphthalocyanine;(II) adding a dispersing aid to the low crystalline titanylphthalocyanine and dispersing at room temperature, in DMF, to prepare a polymorph; and(III) filtering, washing, and drying under a reduced pressure.

REFERENCES:
patent: 1972634 (2008-09-01), None
patent: 61-239248 (1986-10-01), None
patent: 8-209023 (1996-08-01), None
patent: 11-21466 (1999-01-01), None

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