Casting film for producing ceramic green sheet

Abstract

There is disclosed a casting film which is used for producing a ceramic green sheet and which comprises a substrate film (e.g. polyethylene terephthalate film) and a releasing layer formed thereon comprising a mixture of a silicone based releasing agent (e.g. addition reaction type silicone based releasing agent) and a cellulose derivative (e.g. ethyl cellulose, methyl cellulose, hydroxyethyl cellulose, carboxymethyl cellulose or hydroxypropyl cellulose). The casting film has excellent wettability of ceramic slurry and moderate releasability for the ceramic green sheet, and prevents the occurrence of repelling even in the case of the ceramic slurry being coated in a small thickness, and also the occurrence of lifting or peeling off of the green sheets even in the case of the ceramic slurry being repeatedly coated.

What is claimed is:  
     
         1 . A casting film which is used for producing a ceramic green sheet and which comprises a substrate film and a releasing layer formed on at least either side thereof, wherein said releasing layer comprises a mixture of a silicone based releasing agent and a cellulose derivative.  
     
     
         2 . The casting film for producing a ceramic green sheet according to  claim 1 , wherein the silicone based releasing agent is an addition reaction type silicone based releasing agent.  
     
     
         3 . The casting film for producing a ceramic green sheet according to  claim 1 , wherein the cellulose derivative is at least one member selected from the group consisting of ethyl cellulose, methyl cellulose, hydroxyethyl cellulose, carboxymethyl cellulose and hydroxypropyl cellulose.  
     
     
         4 . The casting film for producing a ceramic green sheet according to  claim 1 , wherein the ratio of solid content by weight of the silicone based releasing agent to the cellulose derivative (silicone based releasing agent: cellulose derivative) is in the range of 90:10 to 3:97.  
     
     
         5 . The casting film for producing a ceramic green sheet according to  claim 1 , wherein the substrate film comprises polyethylene terephthalate.