Patent ID: 8034417

Claim:
A process for the production of a ceramic green sheet, comprising: (1) producing a casting film which comprises forming, on a substrate film, an undercoat layer consisting of a condensation polymer from a metal alkoxide, a partially hydrolyzed product of a metal alkoxide, or a combination thereof, and then forming a cured layer on the undercoat layer, wherein the forming of the undercoat layer comprises: placing a coating solution comprising the metal alkoxide, the partially hydrolyzed product of the metal alkoxide, or the combination thereof, in a coating amount of 0.05 to 0.2 g/m 2 , expressed in terms of solid content; and heat treating the coating solution at 80 to 110° C.; and wherein the forming of the cured layer comprises: placing an addition reaction type silicone resin composition comprising a photosensitizer, a platinum based compound as a catalyst, a polyorganosiloxane bearing a hexenyl group, and a polyorganosiloxane bearing at least two hydrogen atoms each bonded to a silicon atom in a coating amount of 0.05 to 0.2 g/m 2 , expressed in terms of solid content, on the undercoat layer; heat treating the composition at 40 to 120° C.; and ultraviolet irradiating the heat-treated composition to cure the composition and form the cured layer; and (2) producing the ceramic green sheet which comprises: placing a ceramic slurry comprising one or more ceramic powders, solvent and a binder on the cured layer of the casting film; and drying the slurry.