US5360475A
Expired / Lapsed
US
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Process for preparing hydroxymetal phthalocyanine pigment
Assignee: Fujifilm Business Innovation Corp
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Filing: 1993-10-05
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Granted: 1994-11-01
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Expires: 2013-10-05
Abstract
Abstract A process for preparing a hydroxymetal phthalocyanine pigment containing a central metal atom selected from aluminum, gallium, indium, silicon, germanium and tin and having a novel crystal form is disclosed, comprising treating a precursor of a hydroxymetal phthalocyanine pigment with an acid and treating the precipitated hydroxymetal phthalocyanine pigment with a solvent under an acidic condition. The resulting hydroxymetal phthalocyanine pigment includes hydroxygallium crystals showing distinct diffraction peaks at Bragg angles (2θ±0.2°) of (1) 8.2°, 12.4°, 16.5° and 26.3° or (2) 6.8°, 12.5° and 26.4°. The resulting hydroxymetal phthalocyanine pigment exhibits high photosensitivity and excellent stability as a charge generating material of an electrophotographic photoreceptor.
Inventors
- 👤 Katsumi Nukada
- 👤 Katsumi Daimon
- 👤 Yasuo Sakaguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:43
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/06; G03G5/0664; G03G5/0696; C; C09; C09B; C09B67/00; C09B67/0001; C09B67/0014; C09B67/0016; C09B67/0017; C09B67/0019
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
40 words
A process for preparing a hydroxymetal phthalocyanine pigment comprising treating a precursor of a hydroxymetal phthalocyanine pigment with an acid to precipitate a hydroxymetal phthalocyanine pigment and treating the precipitated hydroxymetal phthalocyanine pigment with a solvent under an acidic condition.
Claim 2
Dependent Claim
40 words
A process for preparing a hydroxymetal phthalocyanine pigment comprising treating a precursor of a hydroxymetal phthalocyanine pigment with an acid to precipitate a hydroxymetal phthalocyanine pigment and treating the precipitated hydroxymetal phthalocyanine pigment with a solvent under an acidic condition.
Claim 3
Dependent Claim
23 words
A process as claimed in claim 1, wherein said precursor of a hydroxymetal phthalocyanine pigment is a precursor of a hydroxygallium phthalocyanine pigment.
Claim 4
Dependent Claim
13 words
A process as claimed in claim 1, wherein said acid is sulfuric acid.
Claim 5
Dependent Claim
44 words
A process as claimed in claim 2, wherein said solvent is an amide solvent or a monohydric alcohol solvent and the resulting hydroxymetal phthalocyanine pigment is a hydroxygallium phthalocyanine crystal having distinct diffraction peaks at Bragg angles (2θ±0.2°) of 8.2°, 12.4°, 16.5°, and 26.3°.
Claim 6
Dependent Claim
51 words
A process as claimed in claim 2, wherein said solvent is a halogenated hydrocarbon solvent, an ether solvent, an aromatic alcohol solvent or a polyhydric alcohol solvent and the resulting hydroxymetal phthalocyanine pigment is a hydroxygallium phthalocyanine crystal having distinct diffraction peaks at Bragg angles (2θ±0.2°) of 6.8°, 12.5° and 26.4°.
Claim 7
Dependent Claim
40 words
A process as claimed in claim 1, wherein said precursor of a hydroxymetal phthalocyanine pigment is a precursor of a hydroxyaluminum phthalocyanine pigment, a hydroxyindium phthalocyanine pigment, a hydroxysilicon phthalocyanine pigment, a hydroxygermanium phthalocyanine pigment or a hydroxytin phthalocyanine pigment.
Claim 8
Dependent Claim
18 words
A hydroxygallium phthalocyanine crystal having distinct diffraction peaks at Bragg angles (2θ±0.2°) of 8.2°, 12.4°, 16.5°, and 26.3°.
Claim 9
Dependent Claim
18 words
A hydroxygallium phthalocyanine crystal having distinct diffraction peaks at Bragg angles (2θ±0.2°) of 8.2°, 12.4°, 16.5°, and 26.3°.
Claim 10
Dependent Claim
17 words
A hydroxygallium phthalocyanine crystal having distinct diffraction peaks at Bragg angles (2θ±0.2°) of 6.8°, 12.5° and 26.4°.
Claim 11
Dependent Claim
17 words
A hydroxygallium phthalocyanine crystal having distinct diffraction peaks at Bragg angles (2θ±0.2°) of 6.8°, 12.5° and 26.4°.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-10-31 | 1998-05-02 | 1998-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-10-31 | 2002-05-02 | 2002-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-10-31 | 2006-05-02 | 2006-11-01 | $7700.00 | Window Closed / Lapsed |