LIGHT-BLOCKING MEMBER FOR OPTICAL INSTRUMENT

摘要

Disclosed is a light-blocking member that is for an optical instrument and has resilience even if made thin, and of which rupture, etc. of a film is difficult to arise. The light-blocking member for an optical instrument contains: a substrate comprising a synthetic resin film; and a light-blocking film that is formed on at least one side of the abovementioned substrate. The abovementioned light-blocking film is characterized by containing: a binder resin of which the hydroxyl value is at least 100 (mg KOH/g); carbon black; inorganic particles; and resin particles of which the average particle size is 1-10 µm. Also, the aforementioned resin particles are characterized by being cross-bridged polymethyl methacrylate particles.