公开(公告)号：US5106536A

公开(公告)日：1992-04-21

申请号：US574851

申请日：1990-08-30

申请人： Eiichi Miyamoto ,  Nariaki Mutou ,  Tooru Nakazawa ,  Tatsuo Maeda

发明人： Eiichi Miyamoto ,  Nariaki Mutou ,  Tooru Nakazawa ,  Tatsuo Maeda

IPC分类号： C09B47/04 ,  C09B67/16 ,  C09B67/22 ,  C09B67/50 ,  C09B67/54 ,  G03G5/06

CPC分类号： G03G5/0696 ,  C09B47/045 ,  C09B67/0019 ,  C09B67/0026 ,  C09B67/0035 ,  C09B67/0096

摘要： A stable .alpha.-type titanyl phthalocyanine composition including an .alpha.-type titanyl phthalocyanine and a metal-free phthalocyanine is disclosed having a wide range of absorption wavelengths and high in spectral sensitivity. The method for making the phthalocyanine composition is carried out by pigmenting a concentrated sulfuric acid solution containing at least titanyl phthalocyanine by an acid paste process. The concentrated sulfuric acid solution is poured into water to produce an .alpha.-type titanyl phthalocyanine composition which is stable to withstand the impact of aging. Also disclosed is an electrophotographic sensitive material which includes a sensitive layer having the .alpha.-type titanyl phthalocyanine composition superposed on an electroconductive substrate. This electrophotographic sensitive material excels in its charging property and its dark attenuation property and exhibits high sensitivity and low residual potential. The electrophotographic sensitive material having a sensitive layer comprising the .alpha.-type titanyl phthalocyanine composition and an electric charge transferring material can also be superposed on an electroconductive substrate. This electrophotographic photosensitive material exhibits an oxidation potential in the ranage of 0.45 to 0.65 eV, enjoys high sensitivity, and shows low residual potential.

公开(公告)号：US4971877A

公开(公告)日：1990-11-20

申请号：US261896

申请日：1988-10-25

申请人： Eiichi Miyamoto ,  Nariaki Mutou ,  Tooru Nakazawa ,  Tatsuo Maeda

发明人： Eiichi Miyamoto ,  Nariaki Mutou ,  Tooru Nakazawa ,  Tatsuo Maeda

IPC分类号： C09B47/04 ,  C09B67/16 ,  C09B67/22 ,  C09B67/50 ,  C09B67/54 ,  G03G5/06

CPC分类号： G03G5/0696 ,  C09B47/045 ,  C09B67/0019 ,  C09B67/0026 ,  C09B67/0035 ,  C09B67/0096

摘要： The first aspect of this invention resides in providing an .alpha.-type titanyl phthalocyanine composition comprising an .alpha.-type titanyl phthalocyanine and metal-free phthalocyanine. This .alpha.-type titanyl phthalocyanine composition is stable, wide in range of absorption wavelengths, and high in spectral sensitivity because it contains an .alpha.-type titanyl phthalocyanine in combination with metal-free phthalocyanine.The second aspect of this invention resides in providing a method for the production of an .alpha.-type titanyl phthalocyanine composition comprising an .alpha.-type titanyl phthalocyanine and a metal-free phthalocyanine, which method comprises pigmenting a concentrated sulfuric acid solution containing at least titanyl phthalocyanine by the acid paste process consisting in pouring said concentrated sulfuric acid solution into water. By this method, an .alpha.-type titanyl phthalocyanine composition stable to withstand the impact of aging can be easily produced.The third aspect of this invention resides in providing an electrophotographic sensitive material having superposed on an electroconductive substrate a sensitive layer compring an .alpha.-type titanyl phthalocyanine and a metal-free phthalocyanine. This electrophotographic sensitive material excels in charging property and dark attenuation property and exhibits high sensitivity and sparing residual potential.The fourth aspect of this invention resides in providing an electrophotographic sensitive material having superposed on an electroconductive substrate a sensitive layer comprising an .alpha.-type titanyl phthalocyanine composition and an electric charge transferring material exhibiting oxidation potential in the range of 0.45 to 0.65 eV. This electrophotographic sensitive material enjoys high sensitivity and shows sparing residual potential.

公开(公告)号：US4877702A

公开(公告)日：1989-10-31

申请号：US263255

申请日：1988-10-27

申请人： Eiichi Miyamoto ,  Nariaki Mutou ,  Tooru Nakazawa

发明人： Eiichi Miyamoto ,  Nariaki Mutou ,  Tooru Nakazawa

IPC分类号： G03G5/06

CPC分类号： G03G5/0614 ,  G03G5/0657

摘要： There is disclosed an electrophotographic sensitive layer which is provided with a single-layer type sensitive layer containing a specific perylene type compound as an electric charge generating substance, a specific diamine derivative of the following general formula as an electric charge transferring substance, and a binding resin. ##STR1## wherein R.sup.5, R.sup.6, R.sup.7, and R.sup.8 independently stand for either a group of the general formula: ##STR2## or a group of the general formula: ##STR3##