Polyurethane adhesive, solar battery protection sheet adhesive, and back side protective sheet for a solar cell

摘要

And to provide an adhesive bond strength to the surface untreated material untreated polyester films is good and to suppress the decrease of adhesive strength with time also in conditions of outdoor exposure, and can maintain the adhesive strength over a long period of time. A polyurethane adhesive using a base material with the curing agent, wherein the base resin, polyester polyol specific (A), polycarbonate polyurethane polyol specific (B), and polyurethane adhesive according to the present invention, bisphenol specific includes at a specific ratio, type epoxy resin and (C), contains a specific amount of a polyisocyanate component having an isocyanurate skeleton, wherein the curing agent.