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1. (EP0514557) COATING SOLUTION FOR FORMING TRANSPARENT ELECTRICALLY CONDUCTIVE FILM, METHOD OF PREPARATION THEREOF, ELECTRICALLY CONDUCTIVE SUBSTRATE, METHOD OF PREPARATION THEREOF, AND DISPLAY DEVICE HAVING TRANSPARENT ELECTRICALLY CONDUCTIVE SUBSTRATE
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Claims

1. A coating solution for forming a transparent conductive coating comprising conductive particles having

(a) a weight average particle diameter of not more than 500 Å, and

(b) an amount of particles having a particle diameter of not more than 600 Å being more than 60% by weight,

(c) an amount of particles having a particle diameter of not more than 100 Å being more than 5% by weight, and

(d) an amount of particles having a particle diameter of more than 1000 Å being not more than 15% by weight, and

a matrix consisting of a silica polymer having

(A) an average degree of polymerization of 1,500-10,000, and

(B) an amount of the polymer having a degree of polymerization of not more than 3,000 being not more than 50% by weight, and

(C) an amount of the polymer having a degree of polymerization of more than 10,000 being not more than 20% by weight

wherein the degree of polymerization signifies the degree of polymerization in terms of polystyrene as determined by means of gel chromatography.
  2. A process for preparing a coating solution for forming a transparent conductive coating which comprises dispersing or dissolving in water and/or organic solvent powdered conductive particles or conductive particles dispersed in a sol having

(a) a weight average particle diameter of not more than 500 Å, and

(b) an amount of particles having a particle diameter of not more than 600 Å being more than 60% by weight,

(c) an amount of particles having a particle diameter of not more than 100 Å being more than 5% by weight, and

(d) an amount of particles having a particle diameter of more than 1000 Å being not more than 15% by weight, and

a matrix consisting of a silica polymer having

(A) an average degree of polymerization of 1,500-10,000, and

(B) an amount of the polymer having a degree of polymerization of not more than 3,000 being not more than 50% by weight, and

(C) an amount of the polymer having a degree of polymerization of more than 10,000 being not more than 20% by weight

wherein the degree of polymerization signifies the degree of polymerization in terms of polystyrene as determined by means of gel chromatography.
  3. A conductive substrate having on the surface thereof a transparent conductive coating formed from the coating solution for forming a transparent conductive coating as described in claim 1.
  4. The conductive substrate as claimed in claim 3 wherein a transparent protective coating is formed on the surface of the transparent conductive coating.
  5. The conductive substrate as claimed in claim 3 or 4 wherein the surface of the substrate, on which the transparent conductive coating has been formed, has a surface resistivity of 10 3 to 10 10 ohm per square, and a haze of not more than 1%.
  6. The conductive substrate as claimed in claim 3 or 4 wherein the surface of the substrate, on which the transparent conductive coating has been formed, has a surface resistivity of 10 3 to 10 10 ohm per square, and a glossiness of 40 to 90%.
  7. The conductive substrate claimed in claim 4 wherein the surface of the substrate, on which the transparent conductive coating and transparent protective coating have been formed, has a surface resistivity of 10 3 to 10 10 ohm per square, a glossiness of 40 to 90%, and a surface reflectance of not more than 1%.
  8. A process for preparing a conductive substrate comprising coating the substrate surface with the coating solution for forming a transparent conductive coating as claimed in claim 1 and heating the transparent conductive coating formed on said substrate surface, characterised in that the transparent conductive coating is irradiated at an uncured stage with an electromagnetic wave having a wavelength of shorter than that of visible light.
  9. A process for preparing a conductive substrate comprising coating the substrate with the coating solution for forming a transparent conductive coating as claimed in claim 1 and heating the transparent conductive coating formed on said substrate surface, characterised in that the transparent conductive coating is exposed at an uncured stage to a gas atmosphere wherein curing reaction of the uncured coating is promoted.
  10. The process for preparing the conductive substrate as claimed in claim 9 wherein the gas which promotes curing reaction is ammonia.
  11. The process for preparing the conductive substrate as claimed in claim 9 wherein the gas which promotes curing reaction is ozone.
  12. A display device provided with a display panel having on its face-plate a transparent conductive coating formed by using a coating solution for forming a transparent conductive coating containing conductive particles having

(a) a weight average particle diameter of not more than 500 Å, and

(b) an amount of particles having a particle diameter of not more than 600 Å being more than 60% by weight,

(c) an amount of particles having a particle diameter of not more than 100 Å being more than 5% by weight, and

(d) an amount of particles having a particle diameter of more than 1000 Å being not more than 15% by weight, and

a matrix consisting of a silica polymer having

(A) an average degree of polymerization of 1,500-10,000, and

(B) an amount of the polymer having a degree of polymerization of not more than 3,000 being not more than 50% by weight, and

(C) an amount of the polymer having a degree of polymerization of more than 10,000 being not more than 20% by weight

wherein the degree of polymerization signifies the degree of polymerization in terms of polystyrene as determined by means of gel chromatography.
  13. A display device provided with a display panel as claimed in claim 12 having a transparent protective coating formed on the surface of the transparent conductive coating.
  14. The display device as claimed in claim 12 or 13 wherein the display panel, on which the transparent conductive coating has been formed, has a surface resistivity of 10 3 to 10 10 ohm per square, a haze of not more than 1% and a resolving power of more than 70 bar/cm.
  15. The display device as claimed in claim 12 or 13 wherein the display panel, on which the transparent conductive coating has been formed, has a surface resistance of 10 3 to 10 10 ohm per square, a glossiness of 40 to 90%, and a resolving power of more than 60 bar/cm.
  16. The display device as claimed in claim 13 wherein the display panel, on which the transparent conductive coating and the transparent protective coating have been formed, has a surface resistivity of 10 3 to 10 10 ohm per square, a glossiness of 40 to 90%, a surface reflectance of not more than 1%, and a resolving power of more than 60 bar/cm.