Patent ID: 7601396

Claim:
A coating film forming method comprising the steps of: applying a coating liquid for forming a SOG film on a material to be treated; and performing heat treatment so as to form a SOG film on the material to be treated, wherein the coating liquid includes a hydrolytic condensation product obtained using an organic solvent, an acid catalyst, and at least one type of alkoxysilane compound which undergoes hydrolysis and condensation within the organic solvent under the acid catalyst, and wherein the heat treatment includes at least a drying process and a subsequent baking process, the temperature of the surface of the material to be treated is escalated from a lower temperature to a higher temperature by setting at least three ranges of the temperature in the drying process, and the temperature of the surface of the material to be treated is further increased to 250-500° C. and once a desired temperature within the range is reached, such temperature is maintained within the range of ±3° C. during the baking process.