FILM FOR OPTICAL COMPONENT, WINDING LAMINATE OF FILM, OPTICAL COMPONENT, AND OPTICAL DISC

摘要

A film for optical parts exhibiting high transmittance of short-wavelength light on the order of 400 nm, low birefringence, and excellent flexibility in which warping can be prevented after use for a long term, and a coiled film laminate using the film for optical parts, and an optical parts and an optical discs. The film for optical parts is characterized by comprising a light transmitting layer principally comprising thermosetting resin where an integrated value of the ratio of loss modulus to storage modulus in a temperature range of 30 DEG C to 80 DEG C as determined by a dynamic viscoelasticity measurement under a tensile stress mode at a frequency of 10 Hz with a heating rate of 3 DEG C/min is 2 or more.