PRESSURE-SENSITIVE ADHESIVE COMPOSITION FOR TRIACETYL CELLULOSE, AS WELL AS LAMINATE USING THE SAME, OPTICAL FILM AND OPTICAL ELEMENT

PROBLEM TO BE SOLVED: To provide a pressure-sensitive adhesive composition with which shrinkage stress of a triacetyl cellulose (TAC) substrate is relaxed and floating from a glass substrate is prevented without using a peroxide even in high temperature and high humidity environment when a TAC substrate 11 and a glass substrate 13 are laminated via a pressure-sensitive adhesive layer 12.SOLUTION: The pressure-sensitive adhesive composition for TAC contains: an acrylic pressure-sensitive adhesive with weight average molecular weight of 400,000 to 900,000; an isocyanate-based curing agent of 0.01 to 0.5 pt.mass in terms of the solid content with respect to the solid content of the acrylic pressure-sensitive adhesive of 100 pts.mass; and an acrylic copolymer composed of a methacrylate polymer block (M) and an acrylate polymer block (A), while the composition does not substantially contain any acid component. The copolymer is suitably an M-A-M type three-block copolymer with weight average molecular weight of 10,000-300,000, and the curing agent is suitably a hexamethylene diisocyanate-based agent.