ADHESIVE LAYER FOR SOLAR CELL BACKSIDE PROTECTIVE SHEET AND MANUFACTURING METHOD THEREOF

摘要

PURPOSE: An adhesive layer for a solar battery backside-protective sheet is provided to have excellent initial adhesion and to minimize degradation of adhesion even under severe environment of high temperature and high humidity. CONSTITUTION: An adhesive layer for a solar battery backside-protective sheet is formed by hardening an adhesive composition and has a glass transition temperature of (-5) -30°C. An adhesion change after 72 hours in condition of 120°C, 100%RH and 2atm is (-25)-5%. The adhesive composition comprises polyester-based polyol with a glass transition temperature of (-15)-5°C and a crosslinking agent. Initial adhesion of the adhesive layer is 9 N/15mm. the adhesive composition additionally comprises 0.01-60 parts by weight of epoxy resin based on 100.0 parts by weight of the polyester-based polyol. [Reference numerals] (AA) Substrate film; (BB) Adhesive layer; (CC) Substrate film