abstract |
PROBLEM TO BE SOLVED: To provide a composition for forming a low refractive index silica-based film capable of forming a low refractive index layer used for an optical member such as a protective film of a lens of a solid-state imaging device, an optical waveguide or the like. A composition for forming a low refractive index silica-based film includes a siloxane polymer and an alkyl quaternary amine. As the siloxane polymer, R n SiX 4-n (1) (In the formula, R independently represents H or a monovalent organic group, X represents a hydrolyzable group, n represents an integer of 0 to 2, and a plurality of R may be the same or different.) A hydrolyzate and / or partial condensate of at least one silane compound represented by [Selection figure] None |