Patent ID: 8679709

Claim:
An electrophotographic photoreceptor, comprising: a conductive substrate; and a photosensitive layer provided on a surface of the conductive substrate, an outermost layer of the photosensitive layer containing a colloidal silica, a binding resin, and a crosslinked product composed of a guanamine compound and at least one charge transporting material comprising a compound represented by Formula (II): where Ar 1 through Ar 4 may be the same or different from each other and each independently represent a substituted or unsubstituted aryl group; Ar 5 represents a substituted or unsubstituted aryl group or a substituted or unsubstituted arylene group; D represents —(—R 7 —X) n1 R 8 —Y; R 7 and R 8 each independently represent a linear or branched alkylene group having 1 to 5 carbon atoms; n1 represents 0 or 1; X represents oxygen, NH, or sulfur atom; Y represents —OH, —OCH 3 , —NH 2 , —SH, or —COOH; each c independently represents 0 or 1; k represents 0 or 1; and a total number of D is 3 or 4, wherein the guanamine compound is at least one selected from the group consisting of a compound represented by the following formula (A) and multimers thereof: where in the formula (A), R 1 represents a linear or branched alkyl group having 1 to 10 carbon atoms, a substituted or unsubstituted phenyl group having 6 to 10 carbon atoms, or a substituted or unsubstituted alicyclic hydrocarbon group having 4 to 10 carbon atoms; R 2 through R 5 each independently represent a hydrogen atom, —CH 2 —OH, or —CH 2 —O—R 6 ; and R 6 represents a hydrogen atom or a linear or branched alkyl group having 1 to 10 carbon atoms; a ratio by weight of the charge transporting material to the guanamine compound in the outermost layer is from 0.2:1 to 4:1; an amount of the guanamine compound in the outermost layer with respect to the entire outermost layer is from 10% by weight to 80% by weight; and the binding resin of the outermost layer consists of the guanamine compound or consists of the guanamine compound and at least one of a polyvinyl acetal resin or a polyvinyl phenolic resin.