Crystallization inhibiting mixtures of arylmethane photoconductors

Claim 2

An electrophotographic element comprising a conductive support and an organic photoconductive layer containing a crystallization inhibiting mixture of at least two different organic photoconductors selected from the class of organic photoconductors represented by the formula ##STR3## wherein R is selected from the group consisting of alkyl, aralkyl and substituted and unsubstituted aryl; X and X', which may be the same or different, are selected from the group consisting of hydrogen, alkyl, alkoxy, hydroxy, NO 2 and halogen; Y and Y', which may be the same or different, are selected from the group consisting of hydrogen, alkyl, alkoxy, hydroxyl, halogen and NO 2 ; A and B, when taken alone may be the same or different, are selected from the group consisting of hydrogen, alkoxy, hydroxyl, halogen, substituted or unsubstituted aryl, alkyl, cycloalkyl having four to ten carbon atoms, and cycloalkenyl having four to eight carbon atoms; or A and B, when taken together, represents sufficient atoms to form together with the carbon to which they are attached a substituted or unsubstituted carbocyclic ring having from 4 to 10 carbon atoms; wherein each organic photoconductor may be present in said layer up to the limit of its solubility in the binder; and wherein A and/or B in at least one of said photoconductors is substituted or unsubstituted aryl.

Claim 3

In an electrophotographic process wherein the photoconductive layer of a photoconductive element is electrostatically charged, imagewise exposed to light to form an electrostatic charge pattern, and developed to form an image, the improvement wherein said photoconductive layer comprises a crystallization inhibiting mixture of at least two different organic photoconductors selected from the class of organic photoconductors represented by the formula: ##STR4## wherein R is selected from the group consisting of alkyl, aralkyl and substituted and unsubstituted aryl; X and X', which may be the same or different, are selected from the group consisting of hydrogen, alkyl, alkoxy, hydroxy, NO 2 and halogen; Y and Y', which may be the same or different, are selected from the group consisting of hydrogen, alkyl, alkoxy, hydroxyl, halogen and NO 2 ; A and B, when taken alone may be the same or different, are selected from the group consisting of hydrogen, alkoxy, hydroxyl, halogen, substituted or unsubstituted aryl, alkyl, cycloalkyl having four to ten carbon atoms, and cycloalkenyl having four to eight carbon atoms; or A and B, when taken together, represents sufficient atoms to form together with the carbon to which they are attached a substituted or unsubstituted carbocyclic ring having from 4 to 10 carbon atoms; wherein each organic photoconductor may be present in said layer up to the limit of its solubility in the binder; and wherein A and/or B in at least one of said photoconductors is substituted or unsubstituted aryl.

Claim 4

In an electrophotographic process wherein the photoconductive layer of a photoconductive element is electrostatically charged, imagewise exposed to light to form an electrostatic charge pattern, and developed to form an image, the improvement wherein said photoconductive layer comprises a crystallization inhibiting mixture of at least two different organic photoconductors selected from the class of organic photoconductors represented by the formula: ##STR4## wherein R is selected from the group consisting of alkyl, aralkyl and substituted and unsubstituted aryl; X and X', which may be the same or different, are selected from the group consisting of hydrogen, alkyl, alkoxy, hydroxy, NO 2 and halogen; Y and Y', which may be the same or different, are selected from the group consisting of hydrogen, alkyl, alkoxy, hydroxyl, halogen and NO 2 ; A and B, when taken alone may be the same or different, are selected from the group consisting of hydrogen, alkoxy, hydroxyl, halogen, substituted or unsubstituted aryl, alkyl, cycloalkyl having four to ten carbon atoms, and cycloalkenyl having four to eight carbon atoms; or A and B, when taken together, represents sufficient atoms to form together with the carbon to which they are attached a substituted or unsubstituted carbocyclic ring having from 4 to 10 carbon atoms; wherein each organic photoconductor may be present in said layer up to the limit of its solubility in the binder; and wherein A and/or B in at least one of said photoconductors is substituted or unsubstituted aryl.

Claim 5

An electrophotographic layer comprising an electrically insulating binder and a crystallization inhibiting mixture of at least two different organic photoconductors selected from the class of organic photoconductors represented by the formula: ##STR5## wherein R is selected from the group consisting of alkyl, aralkyl, and substituted and unsubstituted aryl; X and X', which may be the same or different, are selected from the group consisting of hydrogen, alkyl, alkoxy, hydroxy, NO 2 and halogen; Y and Y', which may be the same or different, are selected from the group consisting of hydrogen alkyl, alkoxy, hydroxy, halogen and NO 2 ; A and B, when taken alone, may be the same or different, and are selected from the group consisting of hydrogen, alkoxy, hydroxy, halogen, substituted or unsubstituted aryl, alkyl, cycloalkyl having four to ten carbon atoms and cycloalkenyl having four to eight carbon atoms; or A and B, when taken together, represents sufficient atoms to form together with the carbon to which they are attached a substituted or unsubstituted carbocyclic ring having from 4 to 10 carbon atoms; wherein each organic photoconductor may be present in said layer up to the limit of its solubility in the binder, and wherein A and/or B in at least one of said photoconductors is substituted or unsubstituted aryl.

Claim 6

An electrophotographic layer comprising an electrically insulating binder and a crystallization inhibiting mixture of at least two different organic photoconductors selected from the class of organic photoconductors represented by the formula: ##STR5## wherein R is selected from the group consisting of alkyl, aralkyl, and substituted and unsubstituted aryl; X and X', which may be the same or different, are selected from the group consisting of hydrogen, alkyl, alkoxy, hydroxy, NO 2 and halogen; Y and Y', which may be the same or different, are selected from the group consisting of hydrogen alkyl, alkoxy, hydroxy, halogen and NO 2 ; A and B, when taken alone, may be the same or different, and are selected from the group consisting of hydrogen, alkoxy, hydroxy, halogen, substituted or unsubstituted aryl, alkyl, cycloalkyl having four to ten carbon atoms and cycloalkenyl having four to eight carbon atoms; or A and B, when taken together, represents sufficient atoms to form together with the carbon to which they are attached a substituted or unsubstituted carbocyclic ring having from 4 to 10 carbon atoms; wherein each organic photoconductor may be present in said layer up to the limit of its solubility in the binder, and wherein A and/or B in at least one of said photoconductors is substituted or unsubstituted aryl.

Claim 7

A layer according to claim 3 wherein A and/or B in at least one of said photoconductors is substituted or unsubstituted phenyl.

Claim 8

A layer according to claim 3 wherein the organic photoconductors are bis (4-N,N-diethylamino-2-methylphenyl)-4-methylphenylmethane, 1,1-bis(4-N,N-diethylamino-2-methylphenyl)-2-methylpropane and 4,4'-bis-(diethylamino)-2,2'-dimethyltriphenylmethane.

Claim 9

A layer according to claim 3, 4 or 5 wherein the total amount of all organic photoconductors present in said layer is from about 5 to about 40 percent by weight.

Claim 10

A layer according to claim 3, 4 or 5, wherein the mixture of organic photoconductors is included in an aggregate photoconductive layer.

Claim 11

A layer according to claim 3, 4 or 5, wherein each organic photoconductor is present in said layer in equal amounts.

Claim 12

A layer according to claim 3, 4 or 5, wherein the binder is selected from the group consisting of bisphenol A polycarbonate and poly[ethylene-co-isopropylidene-2,2-bis(ethyleneoxyphenylene)terphthalate]

Claim 13

A layer according to claim 3, 4 or 5, which also includes a triphenylamine type photoconductor.

Claim 14

A layer according to claim 3, 4, or 5, which also includes tri-p-tolylamine.