MOLDING MATERIAL COMPOSED OF POLYORGANOSILOXANE COMPOUND, SEALING MATERIAL, AND SEALED OPTICAL DEVICE

摘要

Disclosed is a molding material which contains, as a main component, a ladder polyorganosiloxane compound having a repeating unit represented by formula (I) in a molecule. Also disclosed are a sealing material using the molding material, and a sealed optical device obtained by sealing an optical device with a cured product of the sealing material. A cured product of the molding material can have excellent transparency and heat resistant over a long time. In formula (I), A represents a single bond or a linking group; R1 represents a hydrogen atom or an alkyl group having 1-6 carbon atoms; X0 represents a halogen atom, a haloalkyl group having 1-10 carbon atoms or a cyano group; R2 represents an optionally substituted phenyl group, an alkyl group having 1-20 carbon atoms which may have a substituent (other than a halogen atom or a cyano group), or an alkenyl group having 2-20 carbon atoms; and l, m and n each represents an arbitrary natural number, provided that l and n are not 0 at the same time.