Multiactive electrophotographic element

• US 4,840,861 A
• Filed: 03/16/1988
• Issued: 06/20/1989
• Est. Priority Date: 03/16/1988
• Status: Expired due to Term

• Current Assignee: Eastman Kodak Company
• Original Assignee: Eastman Kodak Company
• Inventors: Weiss, David S., Pavlisko, Joseph A., Staudenmayer, William J.
• Primary Examiner(s): Michl, Paul R.
• Assistant Examiner(s): Lindeman, Jeffrey A.
• Application Number:
  US07/168,835
• Time in Patent Office: 461 Days
• Field of Search: 430/59, 430/96
• US Class Current: 430/58.75
• CPC Class Codes: G03G 5/056 Polyesters
• CPC Class Codes: G03G 5/0564 Polycarbonates

Abstract

An improved reusable multiactive electrophotographic element has a charge-transport layer comprising a triarylamine charge-transport material in a mixture of binders comprising poly[2,2-bis(4-hydroxyphenyl)propane carbonate] and a polyester of 2,2-bis(4-hydroxyphenyl)propane and terephthalic and isophthalic acids, with the weight ratio of the polycarbonate to the polyester being in the range of 9:1 to 3:7.

Claims

1. In an electrophotographic element comprising:

an electrically conductive support;

a charge-generation layer comprising a photoconductive material sensitive to visible or infrared radiaton; and

a charge-transport layer containing a triarylamine charge-transport material,

the improvement wherein the charge-transport layer comprises a mixture of a polycarbonate comprising poly[2,2-bis(4-hydroxyphenyl)propane carbonate] and a polyester formed from 2,2-bis(4-hydroxyphenyl)propane and terephthalic and isophthalic acids, and the weight ratio of the polycarbonate to the polyester is in the range of 9;

1 to 3;

7.

2. The electrophotographic element of claim 1, wherein the molar ratio of terephthalic acid:

isophthalic acid from which the polyester was formed is 55;

45.

3. The electrophotographic element of claim 1, wherein the triarylamine charge-transport material comprises 1,1-bis[4-(di-4-tolylamino)phenyl]-3-phenylpropane.