Electrophotographic photoconductor, method of manufacturing the same, and electrophotographic apparatus
An electrophotographic photoconductor including a sequentially-provided conductive substrate, an undercoat layer, and a photosensitive layer. Photosensitive layer is a negatively-charged stacked type including a charge generation layer and a charge transport layer. Undercoat layer contains a resin binder and a first filler, the first filler including a zinc oxide particle surface-treated with an N-acylated amino acid or an N-acylated amino acid salt, and the charge generation layer containing an adduct compound of titanyl phthalocyanine and butanediol.
1 . An electrophotographic photoconductor comprising:
a conductive substrate; and
an undercoat layer and a photosensitive layer sequentially provided on the conductive substrate, wherein
the photosensitive layer is a negatively-charged stacked type having a charge generation layer and a charge transport layer, the charge generation layer containing an adduct compound of titanyl phthalocyanine and butanediol;
the undercoat layer contains a resin binder and a first filler, the first filler containing a zinc oxide particle surface-treated with an N-acylated amino acid or an N-acylated amino acid salt;
the undercoat layer further contains a second filler, the second filler containing a titanium oxide particle surface-treated with an aminosilane compound; and
an amount of the zinc oxide particle surface-treated with the N-acylated amino acid or the N-acylated amino acid salt thereof, with respect to a total amount of fillers including the first filler and the second filler is 20% by mass or more and 80% by mass or less.
2 . The electrophotographic photoconductor according to claim 1 , wherein the adduct compound of titanyl phthalocyanine and butanediol contains one or more compound selected from the group consisting of an adduct compound of titanyl phthalocyanine and 1,2-butanediol, an adduct compound of titanyl phthalocyanine and 2,3-butanediol, and their optical isomers.
3 . The electrophotographic photoconductor according to claim 1 , wherein an average primary particle size of the zinc oxide particle is 1 nm to 350 nm.
4 . The electrophotographic photoconductor according to claim 1 , wherein the resin binder contains two or more resins selected from the group consisting of an acrylic resin, a melamine resin, and a polyvinyl phenol resin.
5 . The electrophotographic photoconductor according to claim 1 , wherein a mass ratio between the first filler and the resin binder in the undercoat layer is 50/50 to 90/10.
6 . A method of manufacturing the electrophotographic photoconductor according to claim 1 , comprising the steps of:
preparing an undercoat layer coating liquid containing the zinc oxide particle surface-treated with an N-acylated amino acid or its salt;
coating a surface of the conductive substrate with the undercoat layer coating liquid to thereby form the undercoat layer on the conductive substrate;
preparing a charge generation layer coating liquid containing the adduct compound of titanyl phthalocyanine and butanediol; and
coating a surface of the undercoat layer with the charge generation layer coating liquid to thereby form the charge generation layer on the undercoat layer.
7 . An electrophotographic apparatus comprising the electrophotographic photoconductor according to claim 1 .