Provided are a phenyl-modified hybrid prepolymer, a phenyl-modified polydimethylsiloxane-based hybrid prepolymer, and a phenyl-modified polydimethylsiloxane-based hybrid polymer, in which the material hardness or the surface tackiness can be controlled in accordance with uses or purposes. The phenyl-modified hybrid prepolymer (B) is produced by subjecting a polydimethylsiloxane having a trialkoxysilyl group at each of both terminals, a phenyltrialkoxysilane, and a diphenyldialkoxysilane to a hydrolysis/condensation reaction. The phenyl-modified polydimethylsiloxane-based hybrid prepolymer (C) comprises the prepolymer (B) and is preferably produced by mixing the prepolymer (B) with a phenyl-modified hybrid prepolymer (A) produced by subjecting a polydimethylsiloxane having a silanol group at each of both terminals and a phenyltrialkoxysilane to a condensation reaction. The phenyl-modified polydimethylsiloxane-based hybrid polymer is obtained by heating and solidifying the prepolymer (C).
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