Trifunctional compound, composition and polymer thereof

A compound represented by Formula (I) or (II):

• wherein in Formulas (I) and (II),
• Ra, Ra1 and Ra2 are independently any of the groups represented by Formulas (2-1) to (2-6), and Ra1 is not the same as Ra2;
• A is independently 1,4-cyclohexylene, 1,4-cyclohexenylene, 1,4-phenylene, naphthalene-2,6-diyl, tetrahydronaphthalene-2,6-diyl, fluorene-2,7-diyl or bicyclo[2.2.2]octane-1,4-diyl;
• in these rings, optional —CH2— may be replaced by —O—, optional —CH═ may be replaced by —N═ and optional hydrogens may be replaced by halogen, alkyl having 1 to 5 carbon atoms or halogenated alkyl having 1 to 5 carbon atoms;
• Z is independently a single bond or alkylene having 1 to 20 carbon atoms;
• in the alkylene, optional —CH2— may be replaced by —O—, —CO—, —COO—, —OCO—, —CH═CH—, —CF═CF— or —C≡C— and optional hydrogen may be replaced by halogen;
• Y is independently a single bond or alkylene having 1 to 20 carbon atoms;
• in the alkylene, optional —CH2— may be replaced by —O—, —CO—, —COO—, —OCO— or —CH═CH—;
• and optional hydrogen may be replaced by halogen;
• provided that when all Ra in Formula (I) are methacryloyloxy groups, excluded is the case in which two A are 1,4-phenylene, two Z are single bonds, two Y adjacent to A are —(OCH2)4— or —(OCH2CH2)1-10— and remaining Y is —CH2CH2—;
• and wherein in Formulas (2-1) to (2-6), Rb is independently hydrogen, halogen or alkyl having 1 to 5 carbon atoms, and optional hydrogen in the alkyl may be replaced by halogen.