LOWLY CRYSTALLINE OXYTITANIUMPHTHALOCYANINE, PRODUCTION OF CRYSTALLINE OXYTITANIUMPHTHALOCYANINE THEREFROM, OXYTITANIUMPHTHALOCYANINE OF NEW CRYSTAL FORM, AND ELECTROPHOTOGRAPHIC PHOTORECEPTOR PREPARED THEREFROM

摘要

PURPOSE:To facilitate the formation of a new crystalline oxytitaniumph- thalocyanine by treating a lowly crystalline oxytitaniumphthalocyanine having strong peaks at specified Bragg angles 2theta + or - 0.2 deg. in Cu Kalpha X-ray diffraction with an organic solvent. CONSTITUTION:A crystalline oxytitaniumphthalocyanine is produced by treating a lowly crystalline oxytitaniumphthalocyanine having strong peaks at Bragg angles 2theta + or - 0.2 deg. of 7.2 deg., 14.2 deg., 24.0 deg. and 27.2 deg. in Cu Kalpha X-ray diffraction. Thus an oxytitaniumphthalocyanine of a new crystal form different from that previously reported can be obtained under easy production conditions and eay treatment conditions. An electrophotographic photoreceptor prepared by using this compound as a charge-generating material has a very high sensitivity to light of a long wavelength, does not undergo a potential change such as a loss of chargeability even in a continued service, excels in potential stability and is good in memory properties to white light.