Mixture of photoconductors in an active matrix

Claim 1

A PHOTOCONDUCTIVE LAYER COMPRISING AN UNORIENTED MIXTURE OF FINELY DIVIDED PHOTOCONDUCTIVE PARTICLES COMPRISING FROM ABOUT ONE-HALF TO ABOUT 5 PARTS BY WEIGHT CADMIUM SULFOSELENIDE AND FROM ABOUT 1 TO ABOUT 5 PARTS BY WEIGHT SELENIUM DISPERSED IN 100 PARTS BY WEIGHT OF AN ACTIVE BINDER MATRIX MATERIAL, SAID PHOTOCONDUCTIVE LAYER HAVING A THICKNESS OF ABOUT 2 TO 100 MICRONS, WITH THE PHOTOCONDUCTIVE PARTICLES BEING PRESENT IN A TOTAL COMBINED CONCENTRATION OF ABOUT 0.5 TO 5 PERCENT BY VOLUME OF THE PHOTOCONDUCTIVE LAYER, THE MIXTURE BEING CAPABLE OF GENERATING HOLES IN RESPONSE TO IMAGEWISE RADIATION, THE BINDER BEING CAPABLE OF TRANSPORTING HOLES INJECTED FROM THE PHOTOCONDUCTIVE PARTICLES DURING IMAGEWISE EXPOSURE, WITH THE BINDER MATERIAL BEING SELECTED FROM THE GROUP CONSISTING OF, POLYVINYL CARBAZOLE, POLY-1-VINYLPYRENE, POLYMETHYLENE PYRENE, AN N-SUBSTITUTED POLYMERIC ACRYLIC ACID AMIDE OF PYRENE, CARBAZOLE, N-ETHYLCARBZOLE, N-PHENYLCARBAZOLE, PYRENE, TERAPHENE, 1-ACETYPYRENE, 2,3-BENZOCHRYSENE, 6,7-BENZOPYRENE, 1-BROMOPYRENE, 1-ETHYLPYRENE, 1METHYLPYRENE, PERYLENE, 2-PHENYLINDOLE, TETRACENE, PICENE, 1,3,6,8-TETRAPHENYLPYRENE, CHRYSENE, FLUORENE, FLUORENONE, PHENANTHRENE, TRIPHENYLENE, 1,2,5,6-DIBEZANTHRACENE, 1,2,3,4-DIBENZANTHRACENE, 2,3-BENZOPYRENEE, 2,3-BENZOCHRYSENE, ANTHRAQUINONE, DIBENZOTHIOPHENE, NAPHTHALENE, AND MIXTURES THEREOF, WITH SAID PHOTOCONDUCTIVE LAYER EXHIBITING AN ABSORPTION COEFFICIENT OF AT LEAST 1/L AND NOT MORE THAN 8/L WHERE L IS THE PHOTOCONDUCTOR LAYER THICKNESS IN MICRONS.

Claim 9

A method of imaging which comprises: a. providing a photoconductive layer comprising an unoriented mixture of finely divided photoconductive particles comprising from about one-half to about 5 parts cadmium sulfoselenide about one-half to 5 parts phthalocyanine, and from about 1 to about 5 parts by weight selenium dispersed in 100 parts by weight of an active bindeR matrix material, said photoconductive layer having a thickness of about 2 to 100 microns, with the photoconductive particles being present in a total combined concentration of about 0.5 to 5 percent by volume of the photoconductive layer, the mixture being capable of generating holes in response to imagewise radiation, the binder being capable of transporting holes injected from the photoconductive particles during imagewise exposure with the binder material being selected from the group consisting of polyvinyl carbazole, poly-1-vinylpyrene; polymethylene pyrene, an N-substituted polymeric acrylic acid amide of pyrene; carbazole; N-phenylcarbazole; pyrene; tetraphene; 1-acetylpyrene; 2,3-benzochrysene; 6,7-benzopyrene; 1-bromopyrene; 1-ethylpyrene; 1-methylpyrene; perylene; 2-phenylindole; tetracene; picene; 1,3,6,8-tetraphenylpyrene; chrysene; fluorene; fluorenone; phenanthrene; triphenylene; 1, 2,5,6-dibenzanthracene; 1,2,3,4-dibenzanthracene; 2,3-benzopyrene; 2,3-benzochrysene; anthraquinone, dibenzothiophene; naphthalene; and mixtures thereof, with said photoconductive layer exhibiting an absorption coefficient of at least 1/L and not more than 8/L where L is the photoconductor layer thickness in microns; b. uniformly electrostatically charging said layer; c. exposing said charged layer to a pattern of radiation to which the particles are sensitive and to which the active matrix binder is substantially non-absorbing until an electrostatic image is formed.

Claim 10

A method of imaging which comprises: a. providing a photoconductive layer comprising an unoriented mixture of finely divided photoconductive particles comprising from about one-half to about 5 parts cadmium sulfoselenide about one-half to 5 parts phthalocyanine, and from about 1 to about 5 parts by weight selenium dispersed in 100 parts by weight of an active bindeR matrix material, said photoconductive layer having a thickness of about 2 to 100 microns, with the photoconductive particles being present in a total combined concentration of about 0.5 to 5 percent by volume of the photoconductive layer, the mixture being capable of generating holes in response to imagewise radiation, the binder being capable of transporting holes injected from the photoconductive particles during imagewise exposure with the binder material being selected from the group consisting of polyvinyl carbazole, poly-1-vinylpyrene; polymethylene pyrene, an N-substituted polymeric acrylic acid amide of pyrene; carbazole; N-phenylcarbazole; pyrene; tetraphene; 1-acetylpyrene; 2,3-benzochrysene; 6,7-benzopyrene; 1-bromopyrene; 1-ethylpyrene; 1-methylpyrene; perylene; 2-phenylindole; tetracene; picene; 1,3,6,8-tetraphenylpyrene; chrysene; fluorene; fluorenone; phenanthrene; triphenylene; 1, 2,5,6-dibenzanthracene; 1,2,3,4-dibenzanthracene; 2,3-benzopyrene; 2,3-benzochrysene; anthraquinone, dibenzothiophene; naphthalene; and mixtures thereof, with said photoconductive layer exhibiting an absorption coefficient of at least 1/L and not more than 8/L where L is the photoconductor layer thickness in microns; b. uniformly electrostatically charging said layer; c. exposing said charged layer to a pattern of radiation to which the particles are sensitive and to which the active matrix binder is substantially non-absorbing until an electrostatic image is formed.