# US 4,397,932 A · Electrophotographic composition and elements

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- Number: US 4,397,932 A
- Document ID: US4397932A
- Status: Granted
- Kind: A
- Application number: 06/314,976
- Filed: 1981-10-26
- Granted: 1983-08-09
- Earliest claimed: 1981-10-26
- Assignees: A. B. Dick Company
- Inventors: Hepburn S. Young
- Web page: https://patentgrep.com/patent/US4397932A

## CPC

- G03G 5/0609: {containing oxygen}
- G03G 5/073: {comprising pending carbazole groups}
- G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY

## Abstract

An electrophotographic member having increased sensitivity to a longer wave length formulated of a complex formed by the reaction of Ninhydrin with a tertiary amine and which includes a polyalkenyl carbazole.

## Claims

### Claim 1

An electrophotographic member comprising a conductive substrate, a photoconductive coating on the substrate formulated of an electron-sensitizer complex formed by reaction of Ninhydrin with a tertiary amine and in which the coating composition includes a polyalkenyl carbazole.

### Claim 2 (depends on 1)

An electrophotographic member as claimed in claim 1 in which the substrate is a metalized plastic film.

### Claim 3 (depends on 1)

An electrophotographic member as claimed in claim 1 in which the polyalkenyl carbazole is poly-N-vinyl carbazole.

### Claim 4 (depends on 1)

An electrophotographic member as claimed in claim 1 in which the tertiary amine is selected from the group consisting of 4,4'-tetramethyl diamino triphenyl methane; 4,4',4"-methylidyne tris(N,N-dimethylaniline); and methylene bis-(N,N-dimethylaniline).

### Claim 5 (depends on 1)

An electrophotographic member as claimed in claim 1 in which the Ninhydrin and tertiary amine are present in the ratio of 0.25 to 25 moles of Ninhydrin per amine hydrogen of the tertiary amine.

### Claim 6 (depends on 1)

An electrophotographic member as claimed in claim 1 in which the Ninhydrin and tertiary amine are present in the weight ratio of 1 part by weight tertiary amine per 0.5-5 parts by weight Ninhydrin.

### Claim 7 (depends on 1)

An electrophotographic member as claimed in claim 1 in which the carbazole is present in the ratio of 3 to 500 parts by weight per 10 to 100 parts by weight of the complex.

### Claim 8 (depends on 1)

An electrophotographic member as claimed in claim 1 in which the carbazole is present in the ratio of 1 part by weight of the complex to 1 to 10 parts by weight of the carbazole.

### Claim 9

The method of preparing a photoconductive element comprising coating a conductive substrate with a photoconductive composition in the form of a solvent solution of an electron-sensitizer complex formed of Ninhydrin and a tertiary amine and which includes a polyalkenyl carbazole.

### Claim 10 (depends on 9)

The method as claimed in claim 9 in which the solvent is selected from the group consisting of tetrahydrofuran and cyclohexanone.

### Claim 11 (depends on 9)

The method as claimed in claim 9 in which the components are present in the solution in an amount within the range of 1 to 10 percent by weight solids.

### Claim 12 (depends on 9)

The method as claimed in claim 9 in which the Ninhydrin and tertiary amine are present in the ratio of 0.25 to 25 moles of Ninhydrin per amine hydrogen.

### Claim 13 (depends on 9)

The method as claimed in claim 9 in which the Ninhydrin and tertiary amine are present in the weight ratio of 1 part by weight amine per 0.5 to 5 parts by weight Ninhydrin.

### Claim 14 (depends on 9)

The method as claimed in claim 9 in which the polyalkenyl carbazole is present in a weight ratio of 5 to 500 parts by weight and the complex of the Ninhydrin and tertiary amine are present in an amount of 10 to 100 parts by weight.