Electrophotographic recording material
AssigneeHoechst Aktiengesellschaft
InventorWolfgang Wiedemann
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Abstract
This invention relates to an electrophotographic recording material comprising a conductive support, an organic substance capable of transporting electrical charge, and a dyestuff of purple to violet color, having: (a) an X value in the range of from 0.13 to 0.52 and a Y value within the range of from 0.019 to 0.33 in the CIE system, (b) an extended .pi.-electron system of at least 20 .pi.-electrons, and (c) possessing a reflectance of not more than 50% throughout the spectral region of 420 to 750 nm when in the form of a single color-masking layer of about 0.1 g/m.sup.2, and which has a high photosensitivity throughout the said spectral range. The invention also relates to a process for the preparation of the novel recording material.
Claims39
Electrophotographic recording material comprising a conductive support, an organic photoconductive substance capable of transporting electrical charge selected from the group consisting of p- and n-conducting compounds, and a dyestuff of purple to violet color, having:
- a. an X value in the range of from 0.13 to 0.52 and a Y value within the range of from 0.019 to 0.33 in the CIE system,
- b. an extended .pi.-electron system of at least 20 .pi.-electrons, and
- c. possessing a reflectance of not more than 50% throughout the spectral region of 420 to 750 nm when in the form of a single color-masking layer of about 0.1 g/m.sup.2, and which has a high photosensitivity throughout the said spectral range.
A process for the preparation of an electrophotographic recording material comprising a conductive support,
- a first layer on said support including a dyestuff of purple to violet color, having:
- a. an X value in the range of from 0.13 to 0.52 and a Y value within the range of from 0.019 to 0.33 in the CIE system,
- b. an extended .pi.-electron system of at least 20 .pi.-electrons, and
- c. possessing a reflectance of not more than 50% throughout the spectral region of 420 to 750 nm when in the form of a single color-masking layer of about 0.1 g/m.sup.2, and which has a high photosensitivity throughout the said spectral range,
- and a second layer including an organic photoconductive substance capable of transporting electrical charge selected from the group consisting of p- and n-conducting compounds on the first layer, which comprises forming said first layer by vacuum-vapor deposition of the dyestuff onto the support.
Dependencies are inferred from the claim text.