Process for producing an electrophotographic material in which a pinhole-filling dispersion is employed
AssigneeFuji Photo Film Co., Ltd.
InventorsSatoru Honjo, Masaaki Takimoto
Life of this patent
Estimating the term…
Abstract
In a process for producingan electrophotographic light-sensitive material having a porous support such as a paper support and at least one film forming resin layer directly coated on the support, the at least one resin layer is processed with a pinhole-filling dispersion comprising a liquid and a finely dispersed substance such as a pigment, a plastic particle or a pigment coated with a plastic therein, whereby the finely dispersed substance fills and seals pinholes in the film forming resin layer.
Claims21
In a process for producing an electrophotographic light-sensitive material comprising coating a paper support with an electroconductive layer and a photoconductive layer on the opposite side of said electroconductive layer, and directly coating on said paper support at least one film-forming resin layer, wherein said film-forming resin layer can be said electroconductive layer, the improvement which comprises bringing at least one film-forming resin layer directly coated on the support into contact with a pinhole-filling dispersion comprising a volatile liquid and a finely dispersed substance selected from the group consisting of a white or black pigment, a plastic particle or a pigment coated with a plastic therein, said liquid easily penetrating into the interior of the paper support through pinholes in said film forming resin layer and carrying said finely dispersed substance into said pinholes, whereby said finely dispersed substance fills and seals said pinholes which permit the penetration of said liquid and which exist in the surface of said film-forming resin layer which is itself capable of substantially completely preventing penetration of said liquid into said paper support and wherein the rate of penetration of said pinhole-filling dispersion is from about 2 .times. 10.sup.-4 mm.sup.3 to about 60 .times. 10.sup.-4 mm.sup.3 /second.
In a process for producing an electrophotographic light-sensitive material having an electroconductive carbon black-containing paper support and at least one film-forming resin layer directly coated on the support comprising coating said support with a photoconductive layer, wherein said photoconductive layer can be said film-forming resin layer, the improvement which comprises bringing at least one film-forming resin layer directly coated on the carbon black-containing support into contact with a pinhole-filling dispersion comprising a volatile liquid and a finely dispersed substance selected from the group consisting of a white or black pigment, a plastic particle or a pigment coated with a plastic therein, said liquid easily penetrating into the interior of the porous paper support through pinholes in said film-forming resin layer and carrying said finely dispersed substance into said pinholes, whereby said finely dispersed substance fills and seals said pinholes which permit the penetration of said liquid and which exist in the surface of said film-forming resin layer which is itself capable of substantially completely preventine penetration of said liquid into said paper support and wherein the rate of penetration of said pinhole-filling dispersion is from about 2 .times. 10.sup.-4 mm.sup.3 to about 60 .times. 10.sup.-4 mm.sup.3 /second.
Dependencies are inferred from the claim text.