The type of organic solvent is appropriately selected corresponding to the type of a monovalent hydrocarbon contained in each component of the silicone resin or to the molecular weight of each component of the silicone resin. [0051] Examples of such an organic solvent may include, but is not limited to, lower aliphatic alcohols such as methanol, ethanol, isopropanol, n-butanol and isobutanol; ethy