Molding material composed of polyorganosiloxane compound, sealing material, and sealed optical device

A method of producing an optical device sealing material, comprising:

• reacting a silane compound (1) shown by X0—CH(R1)-A-Si(OR4)p(X2)3-p wherein X0 represents a haloalkyl group having 1 to 10 carbon atoms, or a cyano group, R1 represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, A represents an alkylene group having 1 to 6 carbon atoms or an alkyleneoxy group having 1 to 6 carbon atoms of which the carbon atom bonds to the silicon atom, R4 represents an alkyl group having 1 to 6 carbon atoms, X2 represents a halogen atom, and p is an integer from 0 to 3 and a silane compound (2) shown by R2Si(OR5)q(X3)3-q wherein R2 represents a substituted or unsubstituted phenyl group, an alkyl group having 1 to 20 carbon atoms that is optionally substituted except with a halogen atom or a cyano group, an alkenyl group having 2 to 20 carbon atoms, or a group shown by -A1-CH(X1)—R3 wherein A1 represents a single bond or a linking group, X1 represents a hydrogen atom or a group shown by OG wherein G represents a protecting group for a hydroxyl group, R3 represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, R5 represents an alkyl group having 1 to 6 carbon atoms, X3 represents a halogen atom, and q is an integer from 0 to 3 in a molar ratio of 5:95 to 100:0 (=silane compound (1):silane compound (2)) in the presence of a catalyst to obtain a polyorganosiloxane compound;
• preparing a cured molding material comprising the polyorganosiloxane as a main component to produce the optical device sealing material;
• wherein the polyorganosiloxane compound has a weight average molecular weight of 1,000 to 10,000.

A sealed optical device comprising an optical device, the optical device being sealed with a cured product of a sealing material comprising a polyorganosiloxane compound as a main component, the polyorganosiloxane compound having a ladder structure including a repeating unit shown by the following formula (I) in the molecule,

• wherein A represents an alkylene group having 1 to 6 carbon atoms or an alkyleneoxy group having 1 to 6 carbon atoms of which the carbon atom bonds to the silicon atom,
• R1 represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms,
• X0 represents a haloalkyl group having 1 to 10 carbon atoms, or a cyano group,
• R2 represents a substituted or unsubstituted phenyl group, an alkyl group having 1 to 20 carbon atoms that is optionally substituted except with a halogen atom or a cyano group, an alkenyl group having 2 to 20 carbon atoms, or a group shown by -A1-CH(X1)—R3 wherein A1 represents a single bond or a linking group, X1 represents a hydrogen atom or a group shown by OG wherein G represents a protecting group for a hydroxyl group, and R3 represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, and
• l, m, and n are individually 0 or an arbitrary natural number, provided that l and n are not 0 at the same time.