US4895782A — Process for preparing dispersion liquid containin…

Claim 1

Independent Claim 130 words

In a process for preparing an electrophotographic, photosensitive member, which comprises (a) a step of forming a charge generation layer by applying and drying a dispersion liquid containing an organic photoconductive azo pigment represented by the following general formula: ##STR9## wherein R 1 represents a hydrogen atom of a substituted or unsubstituted alkyl group and A represents a coupler residue having a phenolic hydroxyl group, and (b) a step of forming a charge transport layer by applying and drying a solution of a charge-transporting substance, said charge transport layer being formed on an electroconductive support either before or after formation of said charge generation layer, the improvement which comprises subjecting said organic photoconductive azo pigment to a heating pretreatment step in a ketone-type solvent prior to forming said dispersion liquid.

Claim 2

Dependent Claim 130 words

In a process for preparing an electrophotographic, photosensitive member, which comprises (a) a step of forming a charge generation layer by applying and drying a dispersion liquid containing an organic photoconductive azo pigment represented by the following general formula: ##STR9## wherein R 1 represents a hydrogen atom of a substituted or unsubstituted alkyl group and A represents a coupler residue having a phenolic hydroxyl group, and (b) a step of forming a charge transport layer by applying and drying a solution of a charge-transporting substance, said charge transport layer being formed on an electroconductive support either before or after formation of said charge generation layer, the improvement which comprises subjecting said organic photoconductive azo pigment to a heating pretreatment step in a ketone-type solvent prior to forming said dispersion liquid.

Claim 3

Dependent Claim 86 words

A process according to claim 1, wherein the A of the general formula is represented by the following general formula: ##STR10## wherein R 2 represents a substituted or unsubstituted alkyl group, aryl group, aralkyl group or heterocyclic group and R 3 , R 4 , R 5 R 6 represent a hydrogen atom, a halogen atom, a hydroxyl group, a nitro group, a trifluoromethyl group, a cyano group, an alkyl group, an alkoxy group or a substituted or unsubstituted aryl group, aralkyl group or amino group.

Claim 4

Dependent Claim 20 words

A process according to claim 1, wherein the solvent for dispersion of the azo pigment is a ketone type solvent.

Claim 5

Dependent Claim 21 words

A process according to claim 1, wherein the ketone type solvent for the heating treatment is methylisobutylketone, di-n-propylketone, cyclopentanone or cyclohexanone.

Claim 6

Dependent Claim 21 words

A process according to claim 1, wherein the heating treatment is carried out at a temperature of 50° C. or higher.

Claim 7

Dependent Claim 41 words

A process according to claim 1, wherein the charge transporting substance is selected from a hydrazone type compound, a styryl type compound, a pyrazoline type compound, an oxazole type compound, a thiazole type compound, a triarylmethane type compound and a polyarylalkane.

Claim 8

Dependent Claim 125 words

In an electrophotographic photosensitive member, which comprises an electroconductive support, a charge generation layer formed by applying and drying a dispersion liquid containing an organic photoconductive azo pigment represented by the following general formula: ##STR11## wherein R 1 represents a hydrogen atom of a substituted or unsubstituted alkyl group and A represents a coupler residue having a phenolic hydroxyl group and a charge transport layer formed by applying and drying a solution of a charge-transporting substance, said charge transport layer being formed on said electroconductive support either before or after formation of said charge generating layer the improvement which comprises employing said organic photoconductive azo pigment which has been subjected to a heating pretreatment step in a ketone-type solvent prior to forming said dispersion liquid.

Claim 9

Dependent Claim 125 words

In an electrophotographic photosensitive member, which comprises an electroconductive support, a charge generation layer formed by applying and drying a dispersion liquid containing an organic photoconductive azo pigment represented by the following general formula: ##STR11## wherein R 1 represents a hydrogen atom of a substituted or unsubstituted alkyl group and A represents a coupler residue having a phenolic hydroxyl group and a charge transport layer formed by applying and drying a solution of a charge-transporting substance, said charge transport layer being formed on said electroconductive support either before or after formation of said charge generating layer the improvement which comprises employing said organic photoconductive azo pigment which has been subjected to a heating pretreatment step in a ketone-type solvent prior to forming said dispersion liquid.

Claim 10

Dependent Claim 89 words

An electrophotographic photosensitive member according to claim 7, wherein the a of the general formula is represented by the following general formula: ##STR12## wherein R 2 represents a substituted or unsubstituted alkyl group, aryl group, aralkyl group or heterocyclic group and R 3 , R 4 , R 5 and R 6 represent a hydrogen atom, a halogen atom, a hydroxyl group, a nitro group, a trifluoromethyl group, a cyano group, an alkyl group, an alkoxy group, or a substituted or unsubstituted aryl group, aralkyl group or amino group.

Claim 11

Dependent Claim 43 words

An electrophotographic photosensitive member according to claim 7, wherein the charge transporting substance is selected from a hydrazone type compound, a styryl type compound, a pyrazoline type compound, an oxazole type compound, a thiazole type compound, a triarylmethane type compound and a polyarylalkane.

Claim 12

Dependent Claim 14 words

A process according to claim 1, which comprises a step of forming an underlayer.

Claim 13

Dependent Claim 18 words

A process according to claim 1, wherein a charge transport layer is formed on a charge generation layer.

Claim 14

Dependent Claim 90 words

In a process for preparing an electrophotographic, photosensitive member, which comprises a step of forming a photosensitive layer by applying and drying a dispersion liquid containing a charge-transporting substance and an organic photoconductive azo pigment represented by the following general formula: ##STR13## wherein R 1 represents a hydrogen atom of a substituted of unsubstituted alkyl group and A represents a coupler residue having a phenolic hydroxyl group, the improvement comprising subjecting said organic photoconductive azo pigment to a heating treatment in a ketone-type solvent prior to forming said dispersion liquid.

Claim 15

Dependent Claim 90 words

In a process for preparing an electrophotographic, photosensitive member, which comprises a step of forming a photosensitive layer by applying and drying a dispersion liquid containing a charge-transporting substance and an organic photoconductive azo pigment represented by the following general formula: ##STR13## wherein R 1 represents a hydrogen atom of a substituted of unsubstituted alkyl group and A represents a coupler residue having a phenolic hydroxyl group, the improvement comprising subjecting said organic photoconductive azo pigment to a heating treatment in a ketone-type solvent prior to forming said dispersion liquid.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1993-01-22	1993-07-24	1994-01-23	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1997-01-22	1997-07-24	1998-01-23	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2001-01-22	2001-07-24	2002-01-23	$7700.00	Window Closed / Lapsed

Process for preparing dispersion liquid containing organic, photoconductive azo pigment and process for preparing electrophotographic, photosensitive member

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