TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The thiol compound (B) contains aromatic ring(s) and/or linear or branched 2-20C alicyclic carbon chain in a molecule. The portion of carbon atoms in carbon chain is optionally substituted by oxygen, sulfur or silicon. The thiol compound is aromatic thiol, aromatic thiol having sulfur, aliphatic thiol having sulfur or non-aromatic ring-containing thiol, and/or aliphatic thiol, preferably diethane(ethylenedithio)thiol, bis(mercaptomethyl)benzene, benzenedithiol, benzenetrithiol, naphthalenedithiol, thiobisbenzenethiol, ethylene glycol bis(3-mercaptopropionate), butanediol bis(3-mercaptopropionate), trimethylol-propane tris(3-mercaptopropionate), and/or pentaerythritol tetrakis(3-mercaptopropionate), more preferably bis(mercaptomethyl)benzene, benzenedithiol, benzenetrithiol, naphthalenedithiol and/or thiobisbenzenethiol. The aromatic ester compound (c1) of compound (C) is ester compound of aromatic or aliphatic carboxylic acid and aromatic alcohol, ester compound of aliphatic carboxylic acid and aromatic alcohol, and/or ester compound of aliphatic or aromatic carboxylic acid and bisphenol A. The reaction material of organic compound (c2) is diallyl phthalate and bis (dimethyl silyl) benzene, diallyl phthalate and diphenylsilane, divinylbenzene and bis(dimethylsilyl)benzene, vinylbenzene and bis(dimethylsilyl)benzene, adipic acid divinyl ester and bis(dimethylsilyl)benzene, adipic acid divinyl ester and diphenylsilane, diallyl phthalate and dimethyl phenyl silane, and/or triarylisocyanurate and bis(dimethylsilyl)benzene. The organic compound (c3) is addition reactant of aliphatic thiol and carbon-carbon unsaturated double bond-containing aromatic compound, or addition reactant of aromatic thiol and carbon-carbon unsaturated double bond-containing aliphatic compound, preferably ethylene glycol bis(3-mercaptopropionate), vinylbenzene or allyl benzene, ethylene glycol bis(thioglycolate), vinyl benzene or allyl benzene, trimethylol-propane tris(3-mercaptopropionate), vinylbenzene or allyl benzene, and/or dimercapto benzene and hexene. The content of compound (A) is 50-90 wt.% with respect to total content of titanoxane compound (A), thiol compound (B), and aromatic ring-containing organic compound (C). The titanoxane compound (A) is of formula: TiaOb(OR)c.R=1-12C alkyl;a=2-80;b=1.8a to a;andc=4a-b.Preferred Property: The thiol compound (B) has thiol group equivalent of 1000 g/eq or less.