Orient Chemical Industries, Ltd.

Kenji Takaki

Yasuhiro Yamasaki

Kazuyoshi Kuroda

The present invention provides a method for producing a polymorphic form of a titanylphthalocyanine having superior photoreceptor characteristics, particularly superior chargeability and photosensitivity to those of the conventional titanylphthalocyanines.

Method for producing a specific polymorph of titanylphthalocyanine

The present invention relates to a method for producing an &#x3b1;-form titanylphthalocyanine represented by the formula (1): which has a peak at a Bragg angle (2&#x3b8;&#xb1;0.2&#xb0;) in X-ray diffraction spectrum with CuK &#x3b1;-ray: 7.5&#xb0;, 10.2&#xb0;, 12.6&#xb0;, 13.2&#xb0;, 15.1&#xb0;, 16.3&#xb0;, 17.3&#xb0;, 18.3&#xb0;, 22.5&#xb0;, 24.2&#xb0;, 25.3&#xb0; and 28.6&#xb0;, wherein the method includes steps of:

Method for producing &#x3b1;-form titanylphthalocyanine and electrophotographic photoreceptor comprising &#x3b1;-form titanylphthalocyanine

An object of the present invention is to provide a novel &#x3bc;-oxo bridged heterometal phthalocyanine compound, and a production method such that the &#x3bc;-oxo bridged heterometal phthalocyanine compound is obtained simply, selectively and with high yield. The &#x3bc;-oxo bridged heterometal phthalocyanine compound has a structure in which the central metal atom (M1) in a metal phthalocyanine including M1 as central metal thereof is oxo-bridged with the central metal M2 in a metal phthalocyanine including M2 as central metal thereof.

U-oxo crosslinked dissimilar metal phthalocyanine compound and process for selectively producing the same

The present invention provides an organic electrophotographic photo-receptor having a conductive substrate and a photosensitive layer laid on the conductive substrate, wherein the photosensitive layer contains at least one &#x3bc;-oxo bridged heterometal compound as a charge generating material. The organic electrophotographic photo-receptor has high photo-sensitivity, high stability, excellent durability on sensitivity and on electric potential, and has excellent organic photo-conductive property.

Organic electrophotographic photo-receptor

An object of the present invention is to provide a new &#x3bc;-oxo bridged heterometal compound, which can make the photo-functional materials to have diversified properties, and a production method such that the &#x3bc;-oxo bridged heterometal compound is obtained simply, selectively and with high yield. The present invention provides &#x3bc;-oxo bridged heterometal compounds, NcM1-O-M2Nc, PcM1-O-M2Nc and NcM1-O-M2Pc wherein Nc represents naphthalocyanine, Pc represents phthalocyanine, M1 represents a metal atom which is able to have a valence of up to three, and M2 represents a metal atom which is able to have a valence of four or five.

&#x3bc;-Oxo bridged heterometal compound and selective production method thereof

The present invention provides novel .mu.-Oxo-aluminum/gallium phthalocyanine dimer having a structure of the formula (A): ##STR1## The .mu.-oxo-aluminum/gallium phthalocyanine dimer, and the mixed crystals comprising the .mu.-oxo-aluminum/gallium phthalocyanine dimer are suitable as a charge generating material for an organic photoconductive material, such as an electrophotographic photoreceptor.

(.mu.)-oxo-aluminum/gallium phthalocyanine dimer

The present invention provides .mu.-oxo-gallium phthalocyanine dimer having a novel polymorph. The .mu.-oxo-gallium phthalocyanine dimer may be applied as a charge generator for an organic photoconductive material, such as a photoreceptor of practical use and a high-gamma photoreceptor. The resulting organic photoconductive material has good stability and good electronic properties. The .mu.-oxo-gallium phthalocyanine dimer having a novel polymorph which shows diffraction peaks at a Bragg angle (2.theta..+-.0.2.degree.) of 6.8.degree., 12.9.degree., 19.0.degree., 19.6.degree., 20.3.degree., 25.5.degree., 25.9.degree. and 26.9.degree. in an X-ray diffraction spectrum by CuK .alpha.-ray.

.mu.-oxo-gallium phthalocyanine dimer having novel polymorph and

The present invention provides .mu.-oxo-gallium phthalocyanine dimer having a novel polymorph. The .mu.-oxo-gallium phthalocyanine dimer may be applied as a charge generator for an organic photoconductive material, such as a photoreceptor of practical use and a high-gamma photoreceptor. The resulting organic photoconductive material has good stability and good electronic properties. The .mu.-oxo-gallium phthalocyanine dimer having a novel polymorph which shows diffraction peaks at a Bragg angle (2 .theta..+-.0.2.degree.) of 6.8.degree., 12.9.degree., 19.0.degree., 19.6.degree., 20.3.degree., 25.5.degree., 25.9.degree. and 26.9.degree. in an X-ray diffraction spectrum by CuK .alpha.-ray.

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Yawata, Japan

Kenji Takaki