Patent ID: 8865852

Claim:
A low-dielectric-constant thin film with a low dielectric constant of 2.5 or less prepared from a silsesquioxane polymer matrix as a precursor, the silsesquioxane polymer matrix being a silsesquioxane sol prepared by adding one or more stereoisomers of a 3- to 12-membered hydroxycyclosiloxane consisting of 3 to 12 Si atoms with an organic functional group selected from a group consisting of trans, random and twist stereoisomers and a combination thereof to an alkoxysilane, wherein the trans stereoisomer is trans-cis-trans cyclosiloxane, the random stereoisomer is cis-cis-trans cyclosiloxane, and the twist stereoisomer is trans-trans-trans cyclosiloxane, and wherein the organic functional group one or more selected from a group consisting of C1-C12 n-alkyl, isoalkyl, aryl, vinyl, an n-alkyl substituted or unsubstituted aliphatic organic functional group, amine, acryl, halogen and a combination thereof.