Patent ID: 6025102
Filing Date: 2000-02-15
Classification: G03G

Abstract:
An electrophotographic imaging member comprising a substrate and at least one imaging layer comprising a first charge transport material and a different second charge transporting material dissolved or molecularly dispersed in a film forming binder and a high bolling point solvent, said at least one imaging layer having been formed by drying at a predetermined drying temperature a coating comprising a solution of said first and second charge transporting materials and said film forming polymer binder in a mixture of a low boiling point solvent and said high boiling point solvent, said high boiling point solvent having a boiling point at least about said drying temperature and said low boiling point solvent having a boiling point at least about 10.degree. C. lower than said drying temperature whereby residual us high boiling solvent remains in said at least one imaging layer after said drying, said solution comprising between about 60 percent by weight and about 40 percent by weight of said film forming binder and between about 3 percent and about 10 percent by weight of said second charge transport material and between about 37 percent by weight and about 50 percent by weight said first charge transport molecule, all based on the total weight of solids in said solution, said second transporting material is derived from a charge transporting reactant selected from the group consisting of a tertiary amine containing molecules and represented by the formula: ##STR13## m is 0 or 1, Z is selected from the group consisting of: ##STR14## n is 0 or 1, Ar is selected from the group consisting of: ##STR15## R is selected from the group consisting of --CH.sub.3, --C.sub.2 H.sub.5, --C.sub.3 H.sub.7, and --C.sub.4 H.sub.9,Ar' is selected from the group consisting of; ##STR16## X is selected from the group consisting of: ##STR17## s is 0,1 or 2, and Q is represented by the formula: ##STR18## wherein: p is 1 or 0R.sub.1, R.sub.2, R.sub.3, R.sub.4 are independently selected from --H, --CH.sub.3,--(CH.sub.2 --).sub.v CH.sub.3,--CH(CH.sub.3).sub.2,--C(CH.sub.3).sub.3 wherein v is 1 to 10, ands and n are independently selected from 0 to 10, and said first charge transport material is an aromatic amine compound having the general formula: ##STR19## wherein: Z is selected from the group consisting of: ##STR20## n is 0 or 1, Ar is selected from the group consisting of: ##STR21## R is selected from the group consisting of --CH.sub.3, --C.sub.2 H.sub.5, --C.sub.3 H.sub.7, and --C.sub.4 H.sub.9,Ar' is selected from the group consisting of; ##STR22## X is selected from the group consisting of: ##STR23## s is 0, 1 or 2.