Polymerizable silane compound

A polysiloxane being a copolycondensation product of a polymerizable silane compound of formula [1]:

• wherein
• X is a phenyl group having at least one substituent having a polymerizable double bond, a naphthyl group having at least one substituent having a polymerizable double bond, a biphenyl group having at least one substituent having a polymerizable double bond, or a phenanthryl group having at least one group having a polymerizable double bond,
• Ar1 is a phenanthryl group, and
• R1 is a methyl group, an ethyl group, or an isopropyl group
• with an alkoxysilane compound different from the polymerizable silane compound.

A polysiloxane being a copolycondensation product of a polymerizable silane compound of formula [1]:

• wherein
• X is a phenyl group having at least one substituent having a polymerizable double bond, a naphthyl group having at least one substituent having a polymerizable double bond, a biphenyl group having at least one substituent having a polymerizable double bond, or a phenanthryl group having at least one group having a polymerizable double bond,
• Ar1 is a phenanthryl group, and
• R1 is a methyl group, an ethyl group, or an isopropyl group
• with an aromatic silane compound of formula [2]:
• Ar2—Si(OR2)3 [2]
• wherein
• Ar2 is a condensed polycyclic hydrocarbon group (optionally substituted with a C1-6 alkyl group), or a hydrocarbon ring assembly group in which two or more aromatic rings are directly bonded through a single bond (optionally substituted with a C1-6 alkyl group), and
• R2 is a methyl group, an ethyl group, or an isopropyl group.

A polysiloxane being a copolycondensation product of (1) a polymerizable silane compound of formula [1]:

• wherein
• X is a phenyl group having at least one substituent having a polymerizable double bond, a naphthyl group having at least one substituent having a polymerizable double bond, a biphenyl group having at least one substituent having a polymerizable double bond, or a phenanthryl group having at least one group having a polymerizable double bond,
• Ar1 is a condensed polycyclic hydrocarbon group (optionally substituted with a C1-6 alkyl group), or a hydrocarbon ring assembly group in which two or more aromatic rings are directly bonded through a single bond (optionally substituted with a C1-6 alkyl group), and
• R1 is a methyl group, an ethyl group, or an isopropyl group, with (2) an aromatic silane compound of formula [2]:
• Ar2—Si(OR2)3 [2]
• wherein
• Ar2 is a phenanthryl group, and
• R2 is a methyl group, an ethyl group, or an isopropyl group.