Ceramic slurry composition, method for producing thin green sheet by extrusion, and electronic device fabricated using the green sheet

Abstract

Disclosed herein is a ceramic slurry composition. The ceramic slurry composition comprises 20˜50 wt. % of a ceramic powder, 2˜10 wt. % of a polymer having an average molecular weight of 400,000 or more, 0.1˜2 wt. % of a polymer having hydrogen bond-forming functional groups, and 40˜75 wt. % of a solvent. If necessary, the ceramic slurry composition further comprises 1˜5 wt. % of a polymer having an average molecular weight of 400,000 or less. Further disclosed are a method for producing a thin green sheet using an extrusion-stretching process, and an electronic device fabricated using the green sheet. The green sheet thus produce has a thickness of 10 μm or less, and can be laminated to form a 40-layer or more stack. No interlayer cracks and pillowing phenomenon occur even when the green sheets are laminated high.

1 . A ceramic slurry composition comprising 20˜50 wt. % of a ceramic powder, 2˜10 wt. % of a polymer having an average molecular weight of 400,000 or more, 0.1˜2 wt. % of a polymer having hydrogen bond-forming functional groups, and 40˜75 wt. % of a solvent.  
     
     
         2 . A ceramic slurry composition comprising 20˜50 wt. % of a ceramic powder, 2˜10 wt. % of a polymer having an average molecular weight of 400,000 or more, 0.1˜2 wt. % of a polymer having hydrogen bond-forming functional groups, 40˜75 wt. % of a solvent, and 15 wt. % of a polymer having an average molecular weight of 400,000 or less.  
     
     
         3 . The ceramic slurry composition according to  claim 1 , wherein the polymer is polyolefins.  
     
     
         4 . The ceramic slurry composition according to  claim 1 , wherein the hydrogen bond-forming functional groups are selected from the group consisting of —OH, —COOH, —COOCH 3 —NH 2  and —NHCO.  
     
     
         5 . The ceramic slurry composition according to  claim 4 , wherein the polymer having the hydrogen bond-forming functional groups is at least one polymer selected from the group consisting of polyvinylacetates, ethylene-acrylic acid copolymers, ethylene-ethylacryl copolymers, ethylene methylacryl copolymers, polyacrylic acids, polymethacrylic acids, polylactic acids, polyvinylbutyrals, polyvinyl alcohols, polyvinylamines, amine-derived polymers, polyurethanes, polyureas and polyamides.  
     
     
         6 . A method for producing a thin green sheet comprising: 
 extruding a ceramic slurry composition to prepare an extruded sheet;    and stretching the extruded sheet,    wherein the ceramic slurry composition comprises 20˜50 wt. % of a ceramic powder, 2˜10 wt. % of a polymer having an average molecular weight of 400,000 or more, 0.1˜2 wt. % of a polymer having hydrogen bond-forming functional groups, and 40˜75 wt. % of a solvent.    
     
     
         7 . A method for producing a thin green sheet comprising: 
 extruding a ceramic slurry composition to prepare an extruded sheet; and    stretching the extruded sheet,    wherein the ceramic slurry composition comprises 20˜50 wt. % of a ceramic powder, 2˜10 wt. % of a polymer having an average molecular weight of 400,000 or more, 0.1˜2 wt. % of a polymer having hydrogen bond-forming functional groups, 40˜75 wt. % of a solvent, and 1˜5 wt. % of a polymer having an average molecular weight of 400,000 or less.    
     
     
         8 . An electronic device comprising: 
 dielectric ceramic layers;    internal electrodes interposed between the respective dielectric ceramic layers; and    external electrodes electrically connected to the 10 respective internal electrodes,    wherein the dielectric ceramic layers are 40-layer or more stacks formed by laminating green sheets, with a thickness of 10 μm or less which are produced in accordance with the method of  claim 6 , and the internal electrodes contain conductive components.