A method for measuring birefringence temperature dependency of a pressure sensitive adhesive, a method for designing and manufacturing a pressure sensitive adhesive, a pressure sensitive adhesive, a display and an optical film

摘要

By bonding the glass plate and the optical film to the pressure sensitive adhesive of the birefringence temperature dependency, even if the glass plate and the optical film are used under an environment of large temperature change, birefringence due to deformation of the pressure- And an optical film with a pressure-sensitive adhesive can be provided with an excellent optical performance by suppressing the occurrence of light leakage or the like. The present invention, in order to obtain the above effect, the display has a structure in which the optical film is attached fit across the pressure-sensitive adhesive layer to a transparent substrate and, a pressure-sensitive adhesive used in the adhesive layer of the optical film, the pressure-sensitive adhesive intrinsic birefringence (Δn ⁰⁾ measurements, ± 0.2 in the range of × 10 ^-4, also, the temperature coefficient (dΔn ⁰ / dT) of the pressure-sensitive adhesive intrinsic birefringence, ± 0.02 × 10 ^-5 / birefringence and temperature dependence of the birefringence is zero both in the range of ℃ To a technique capable of stably providing a pressure-sensitive adhesive of the present invention.