ELECTROPHOTOGRAPHIC COATING COMPOSITIONS EMPLOYING STYRENE TERPOLYMERS AS BINDERS

• US 3,620,729 A
• Filed: 08/28/1969
• Issued: 11/16/1971
• Est. Priority Date: 08/28/1969
• Status: Expired due to Term

• Current Assignee: Dilip K. Ray-Chaudhuri, Paul C. Georgoudis, Stanley Field
• Original Assignee: Dilip K. Ray-Chaudhuri, Paul C. Georgoudis, Stanley Field
• Inventors: Dilip, K. Ray-Chaudhuri, Paul, C. Georgoudis, Field, Stanley
• Primary Examiner(s): Charles E. Van Horn
• Application Number:
  US04/853,959
• Time in Patent Office: 810 Days
• Field of Search: 96/1,1.5,1.8 252/501 260/78.5HC,80.73,80.75,80.8
• US Class Current: 430/84
• CPC Class Codes: G03G 5/0535 Polyolefins; Polystyrenes; Waxes
• CPC Class Codes: G03G 5/0546 Polymers comprising at least one carboxyl radical, e.g. polyacrylic acid, polycrotonic acid, polymaleic acid; Derivatives thereof, e.g. their esters, salts, anhydrides, nitriles, amides

Abstract

Photoconductive coating compositions for application to solid substrates which are to be utilized in electrophotographic operations are described; the resultant photoconductive coatings comprise a layer of photoconductive pigment particles bonded to themselves and to the solid substrate with a styrene terpolymer.

Claims

2. The coating composition of claim 1, wherein the ratio of pigment solids to binder solids ranges from about 2:

1 to 12;

1, by weight.

3. visibly developing said electrostatic image.

4. The coating composition of claim 1, wherein said random styrene terpolymer contains moieties derived from styrene, dioctyl fumarate and monoethyl maleate.

5. The coating composition of claim 1, wherein said photoconductive pigment is selected from the group consisting of zinc oxide, titanium dioxide, selenium oxide and zinc sulfide.

6. An assembly suitable for use in electrophotographic operations, said assembly comprising a solid substrate coated on at least one surface thereof with a photoconductive coating composition comprising a finely divided photoconductive pigment whose particles are bound to said substrate and to one another by means of the dried consolidated residue of an organic solvent solution of a random styrene terpolymer containing moieties derived from:

A. at least one styrene monomer selected from the group consisting of styrene, alpha-methyl styrene and chlorostyrene;

B. at least one monomer selected from the group consisting of the C1-C18 alkyl, the C3-C6 cycloalkyl and the C1-C12 aralkyl esters of an ethylenically unsaturated dicarboxylic acid, wherein the stated carbon atom range for said aralkyl esters refers to the carbon atom content of the alkyl moiety thereof; and

, C. at least one monomer selected from the group consisting of the ethylenically unsaturated monocarboxylic acids, the anhydrides of ethylenically unsaturated dicarboxylic acids, and the C1-C8 monoalkyl esters of ethylenically unsaturated dicarboxylic acids;

the molar ratio of monomers from groups A, B and C being in the range of from about 1.0;

0.95;

0.05 to 1.0;

0.05;

0.5.

7. The assembly of claim 6, wherein the ratio of pigment solids to binder solids ranges from about 2:

1 to 12;

1, by weight.

8. The assembly of claim 6, wherein there is also present from about 0.02 to 0.5 percent of at least one sensitizer dye as based on the weight of the photoconductive pigment solids therein.

9. The assembly of claim 6, wherein said photoconductive pigment is selected from the group consisting of zinc oxide, titanium dioxide, selenium oxide and zinc sulfide.

10. A method for producing an electrostatic image which comprises the steps of