Barrier coated electrophotographic sheet suitable for liquid development

Claim 2

A reproduction sheet as defined in claim 1 wherein said conductor material is polydimethyl diallyl ammonium chloride.

Claim 3

A reproduction sheet as defined in claim 1 wherein the conductor material is an ammonium salt of an alkyl aryl sulfonate in which the aryl group is selected from a group consisting of a benzene group and a naphthalene group and contains one or more alkyl groups having 1-20 carbon atoms.

Claim 4

A reproduction sheet as defined in claim 1 wherein coating contains 5-50 percent by weight of said barrier material and 1-75 percent by weight of said conductor material.

Claim 5

A reproduction sheet as defined in claim 1 wherein said barrier coating includes vinyl acetate.

Claim 6

A reproduction sheet as defined in claim 6 wherein said vinyl acetate is present in an amount up to 40 percent by weight of said coating.

Claim 7

A reproduction sheet as defined in claim 1 wherein said barrier coating includes a hydrated ammonium silicate.

Claim 8

A reproduction sheet as defined in claim 8 wherein said ammonium silicate is present in an amount within the range of 15-40 percent by weight of said coating.

Claim 9

A reproduction sheet as defined in claim 1 wherein said barrier coating is present in a dry coating weight of 2- 14 pounds per 3,000 square feet of surface area.

Claim 10

A reproduction sheet as defined in claim 1 wherein said material for receiving the electrostatic image is selected from the group consisting of a high insulating material and a photoconductive material.

Claim 11

An electrostatic copy process in which use is made of a liquid developer for visual development of a latent electrostatic image comprising the steps of formIng a latent electrostatic image on a copy sheet formed of a conductive base sheet, said base sheet having a thin continuous conductive barrier coating on each surface comprising a resinous barrier material which is a barrier to the penetration of liquid developer and a comductor material selected from the group consisting of a polymeric quaternary ammonium halide selected from the group consisting of polydialkyl divinyl ammonium halides and polydialkyl diallyl ammonium halides and an ammonium salt of an alkyl aryl sulfonate, and a second coating on one surface, said second coating comprising a material adapted to receive an electrostatic image and wetting the copy sheet with the developer liquid whereby the latent electrostatic image becomes visually developed without development of excessive color in the base sheet.

Claim 12

The process as defined in claim 12 wherein said barrier material is polyvinyl alcohol.

Claim 13

The process as defined in claim 12 wherein said conductor material is polydimethyl diallyl ammonium chloride.

Claim 14

The process as defined in claim 12 wherein the conductor material is an ammonium salt of an alkyl aryl sulfonate in which the aryl group is selected from a group consisting of a benzene group and a naphthalene group and contains one or more alkyl groups having 1-20 carbon atoms.

Claim 15

The process as defined in claim 12 wherein coating contains 5-50 percent by weight of said insulating material and 1-75 percent by weight of said conductor material.

Claim 16

The process as defined in claim 12 wherein said conductive barrier coating includes vinyl acetate.

Claim 17

The process as defined in claim 17 wherein said vinyl acetate is present in an amount up to 40 percent by weight of said coating.

Claim 18

The process as defined in claim 12 wherein said coating includes a hydrate ammonium silicate.

Claim 19

The process as defined in claim 19 wherein said ammonium silicate is present in an amount within the range of 15-40 percent by weight of said coating.

Claim 20

The process as defined in claim 12 wherein said coating is present in a dry coating weight of 2-14 pounds per 3,000 square feet of surface area.

Claim 21

The process as defined in claim 12 wherein said second coating is adapted to receive an electrostatic image and is selected from the group consisting of a high insulating material and a photoconductive material.

Claim 22

An electrophotographic reproduction sheet for development of a latent electrostatic image by a liquid developer comprising a conductive base sheet having a thin continuous conductive barrier coating on each side thereof, said coating comprising polyvinyl alcohol, a conductor material selected from the group consisting of a polymeric quaternary ammonium halide selected from the group consisting of polydialkyl divinyl ammonium halides and polydialkyl diallyl ammonium halides and an ammonium salt of an alkyl aryl sulfonate, vinyl acetate and a hydrated ammonium silicate, and a second coating on one side of the said base sheet, said second coating comprising a material adapted to receive an electrostatic image.