DEVELOPER FOR ELECTRONIC PRINTING, AND PROCESS FOR PRODUCING GLASS PLATE HAVING ELECTRIC CONDUCTOR PATTERN

Abstract

To provide a process for producing a glass plate having an electric conductor pattern excellent in adhesion to the surface of the glass plate, whereby it is not required to have a screen ready for every model and adjustment to desired electric heating performance and antenna performance is easy, and a developer therefor. A developer for electronic printing, characterized in that the ratio of Ftc/Ftp is at least 2.5, where Ftc is the adhesive force acting between one toner particle containing conductive fine particles and one carrier, and Ftp is the adhesive force acting between one toner particle containing conductive fine particles and a photoconductor. A process for producing a glass plate is having an electric conductor pattern, which comprises a step of using such a developer for electronic printing and forming a pattern of a toner on a surface of a glass plate by an electronic printing system, and a step of heating the glass plate having the pattern of the toner formed on its surface, at a predetermined temperature to convert the pattern of the toner to a pattern of an electric conductor.

Description

In the accompanying drawings,

FIG. 1 is a schematic side view illustrating an example of a continuous process for producing a glass plate having an electric conductor pattern of the present invention.

FIG. 2 is a schematic view illustrating a control process relating to a preferred embodiment of the present invention.

FIG. 3 is a front view illustrating an example of rear window of an automobile.

Claims

1. A developer for electronic printing, characterized in that the ratio of Ftc/Ftp is at least 2.5, where Ftc is the adhesive force acting between one toner particle containing conductive fine particles and one carrier, and Ftp is the adhesive force acting between one toner particle containing conductive fine particles and a photoconductor.

2. The developer for electronic printing according to claim 1, wherein Ftp is at most 40 nN.

3. The developer for electronic printing according to claim 1, wherein the adhesive force Ftt acting between one toner particle containing conductive fine particles and another toner particle containing conductive fine particles, is at most 30 nN.

4. The developer for electronic printing according to claim 1, wherein the toner particles have an average particle diameter of from 10 to 35 μm.

5. The developer for electronic printing according to claim 1, wherein the toner particles comprise conductive fine particles, a heat decomposable binder resin and glass frit.

6. The developer for electronic printing according to claim 5, wherein the toner particles comprise, based on 100 parts by mass of the total solid content of the toner particles, from 59.8 to 83.8 parts by mass of the conductive fine particles, from 5 to 40 parts by mass of the heat decomposable binder resin and from 0.2 to 5 parts by mass of the glass frit.

7. A process for producing a glass plate having an electric conductor pattern, which comprises a step of using a toner in the developer for electronic printing as defined in claim 1 and forming a pattern of the toner on a surface of a glass plate by an electronic printing system, and a step of heating the glass plate having the pattern of the toner formed on its surface, at a predetermined temperature to convert the pattern of the toner to a pattern of an electric conductor.

8. The process for producing a glass plate having an electric conductor pattern according to claim 7, wherein the temperature for heating the glass plate is from 600 to 740° C.

9. The process for producing a glass plate having an electric conductor pattern according to claim 7, wherein at the same time as the glass plate is heated to convert the pattern of the toner to a pattern of an electric conductor, the heated glass plate is subjected to thermal processing.