Electrostatic printing

Claim 2

A PAPER COPY MEMBER HAVING AN IMAGE RECEIVING SURFACE FOR RECEIVING A DEVELOPED IMAGE IN THE FORM OF A PATTERNED DISTRIBUTION OF PIGMENTED TONER PARTICLES AND TO WHICH SAID TONER PARTICLES ARE FUSABLE BY THE APPLICATION OF HEAT, AND MEANS FOR MAKING SAID IMAGE RECEIVING SURFACE COUNTERACTIVE TO THE RETENTION OF STATIC CHARGES WHICH ARE TRANSFERRED WITH SAID TONER PARTICLES TO SAID IMAGE RECEIVING SURFACE IN A LOW HUMIDITY, HIGH TEMPERATURE ENVIRONMENT IN WHICH THE COPY MEMBER IS LOCATED WHILE THE TONER PARTICLES ARE BEING FUSED THERETO, SAID COPY MEMBER ALSO INCLUDING A WEB OF CELLULOSIC MATERIAL, AND SAID MEANS FOR MAKING SAID IMAGE RECEIVING SURFACE COUNTERACTIVE TO THE RETENTION OF STATIC CHARGES THEREON BEING AN ELECTRICAL CONDUCTIVITY IMPARTING ADDITIVE DISTRIBUTED ON OR IN THE WEB IN AN AMOUNT SUFFICIENT TO REDUCE THE SURFACE RESISTIVITY OF THE IMAGE RECEIVING SURFACE TO REDUCE NOT MORE THAN 3 X 10**11 OHMS/SQUARE AT A RELATIVE HHUMIDITY OF 225 PERCENT UP TO NOT MORE THAN 60 X 10**11OHMS/SAUARE AT A RELATIVE HUMIDITY OF 10 PERCENT TO THEREBY FACILITATE THE DISSIPATION OF STATIC CHARGES THEREFROM IN SAID LOW HUMIDITY, HIGH TEMPERATURE ENVIRONMENT AND THEREBY KEEP SAID CHARGES FROM REDENCY FOR THE COPY MEMBER TO STICK TO ANOTHER CHARGED COPY MEMBER OR TO PARTS OF THE COPY MAKING APPARATUS.

Claim 3

The paper copy member of claim 1, wherein said conductivity imparting additive is an ionizable salt and wherein said cellulosic web has distributed in the surface portions thereof an amount of said ionizable salt which is sufficient to produce a surface resistivity of not more than about 0.9 X 1011 IPC ohms/square at a relative humidity of 25 percent and a surface resistivity of not more than about 25 X 1011 IPC ohms/square at a relative humidity of 10 percent.

Claim 4

A paper copy member having an image receiving surface to which a developed image, which is composed of a patterned distribution of pigmented toner particles, is transferable and to which said toner particles are fusable by the application of heat and means for making said image receiving surface counteractive to the retention of static charges which are transferred with said toner particles to said image receiving surface in a low humidity, high temperature environment in which the paper copy member is located whiLe the toner particles are fused thereto, said paper copy member also including a web of cellulosic material, and the means for making said image receiving surface counteractive to the retention of static charges thereon being an electrical conductivity-imparting additive distributed on or in the web in an amount which is not less than 0.012 grams per standard sheet and which is sufficient to reduce the surface resistivity of the image receiving surface to from not more than 3 X 1011 ohms/square at a relative humidity of 25 percent up to not more than 60 X 1011 ohms/square at a relative humidity of 10 percent to thereby facilitate the dissipation of static charges therefrom in said low humidity, high temperature environment and thereby keep said charges from remaining on said image receiving surface and creating a tendency for the paper copy member to stick to another charged paper copy member or to parts of the copy making apparatus.

Claim 5

A paper copy member having an image receiving surface to which a developed image, which is composed of a patterned distribution of pigmented toner particles, is transferable and to which said toner particles are fusable by the application of heat and means for making said image receiving surface counteractive to the retention of static charges which are transferred with said toner particles to said image receiving surface in a low humidity, high temperature environment in which the paper copy member is located whiLe the toner particles are fused thereto, said paper copy member also including a web of cellulosic material, and the means for making said image receiving surface counteractive to the retention of static charges thereon being an electrical conductivity-imparting additive distributed on or in the web in an amount which is not less than 0.012 grams per standard sheet and which is sufficient to reduce the surface resistivity of the image receiving surface to from not more than 3 X 1011 ohms/square at a relative humidity of 25 percent up to not more than 60 X 1011 ohms/square at a relative humidity of 10 percent to thereby facilitate the dissipation of static charges therefrom in said low humidity, high temperature environment and thereby keep said charges from remaining on said image receiving surface and creating a tendency for the paper copy member to stick to another charged paper copy member or to parts of the copy making apparatus.

Claim 6

The paper copy member of claim 3, wherein said additive is non-silicaceous.

Claim 7

The paper copy member of claim 3, wherein said additive is an ionizable salt.

Claim 8

The paper copy member of claim 3, wherein said additive is a readily ionizable inorganic salt.

Claim 9

The paper copy member of claim 5, together with a humectant dispersed in the image receiving surface portions of said cellulosic web to increase the effectiveness of the ionizable salt in dissipating static charges at low relative humidities, said humectant being soluble or miscible in water and being free of coloring effect on said cellulosic web, and said humectant having a sufficiently high boiling point to withstand temperatures of up to about 250*C. without significant evaporation from the web.

Claim 10

The paper of claim 5, wherein said ionizable salt is free of coloring effect on the cellulosic web, soluble in water, an electrolyte, non-volatile, and discoloration resistant at temperatures of up to about 250*C.

Claim 11

The paper copy member of claim 8, wherein the salt is sodium chloride.

Claim 12

The paper copy member of claim 7, wherein the humectant is glycerin and is present in a ratio of at least about 1 1/2 pounds of glycerin per ton of cellulosic web.

Claim 13

The paper copy member of claim 1, together with a binder dispersed in the surface portions of the cellulosic web.

Claim 14

The paper copy member of claim 11, wherein the binder is an enzyme converted potato starch.