Blackened electromagnetic interference shield glass and method of producing the same

Abstract

Method of producing an electromagnetic interference shield glass, which comprises (a) forming a conductive pattern on at least one side of a front side and a rear side of the glass by using a conductive paste comprising a colored glass frit, and (b) firing the conductive pattern to blacken the conductive pattern, and a blackened electromagnetic interference shield glass.

1 . A method of producing a blackened electromagnetic interference shield glass, which comprises:
 (a) forming a conductive pattern on at least one side of a front side and a rear side of glass by using a conductive paste comprising a colored glass frit; and   (b) firing the glass on which the conductive pattern is formed.   
     
     
         2 . The method of producing a blackened electromagnetic interference shield glass as set forth in  claim 1 , wherein the conductive paste is prepared by dispersing a polymer binder, a colored glass frit and one or more metal powders selected from the group consisting of silver, copper, gold, and aluminum in an organic solvent. 
     
     
         3 . The method of producing a blackened electromagnetic interference shield glass as set forth in  claim 2 , wherein the organic solvent is selected from the group consisting of butyl carbitol acetate, carbitol acetate, cyclohexanone, cellosolve acetate, terpineol, and diethylene glycol monobutyl ether. 
     
     
         4 . The method of producing a blackened electromagnetic interference shield glass as set forth in  claim 2 , wherein the conductive paste comprises 70 to 90 wt % of metal powder, 0.1 to 15 wt % of colored glass frit, and 5 to 30 wt % of organic binder resin solution in which the polymer binder is dissolved in the organic solvent, and the amount of the polymer binder is in the range of 3 to 20 wt % of the total weight of the organic solvent and the polymer binder. 
     
     
         5 . The method of producing a blackened electromagnetic interference shield glass as set forth in  claim 1 , wherein in the (a), a conductive pattern is formed by using the printing process. 
     
     
         6 . The method of producing a blackened electromagnetic interference shield glass as set forth in  claim 5 , wherein the printing process is selected from the group consisting of an offset printing process, an inkjet printing process, and a screen printing process. 
     
     
         7 . The method of producing a blackened electromagnetic interference shield glass as set forth in  claim 6 , wherein the offset printing process comprises:
 (a) filling a concave part of a flat plate that comprises concave and convex parts with the conductive paste;   (b) bringing the flat plate into contact with a printing blanket to transfer the conductive paste from the concave part of the flat plate to the printing blanket; and   (c) bringing the printing blanket into contact with a surface of a glass to transfer the conductive paste from the printing blanket to the surface of the glass to form the conductive pattern on the surface of the glass.   
     
     
         8 . The method of producing a blackened electromagnetic interference shield glass as set forth in  claim 1 , wherein the firing is performed at the temperature in the range of 400 to 700° C. 
     
     
         9 - 16 . (canceled)