Patent ID: 7998567

Claim:
A coating liquid for formation of a protective film for semiconductor processing having a Young's modulus of at least 8 GPa and a specific dielectric constant in a range from 2.7 to 3.0, the coating liquid consisting essentially of: (a) a silicon compound obtained by hydrolyzing tetraalkyl orthosilicate (TAOS) and alkoxysilane (AS) expressed by the following general formula (I) in the presence of tetramethyl ammonium hydroxide (TMAOH), optionally, tetrapropyl ammonium hydroxide (TPAOH), and water, wherein TMAOH functions as a catalyst for the hydrolysis reaction and as a template material for the protective film, X n Si(OR) 4-n (I) ,wherein X denotes a hydrogen atom, a fluorine atom, an alkyl group having 1 to 8 carbon atoms, a fluorine-substituted alkyl group, an aryl group, or a vinyl group, and R denotes a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, an aryl group, or a vinyl group, and n is an integer from 1 to 3; (b) an organic solvent including propylene glycol monomethyl ether (PGME); and (c) water, wherein the water comprises 35% to 65% by weight of the liquid composition.