TWI488747B

• Main Authors: SATO, KENTA, TAKAMIYA, HIROYUKI, UENO, KENJI, INO, MASATAKA
• Format: Patent
• Language: Chinese
• Published: 21.06.2015
• Subjects: ADHESIVES; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMICAL PAINT OR INK REMOVERS; CHEMISTRY; COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS; COMPOSITIONS BASED THEREON; CORRECTING FLUIDS; DYES; FILLING PASTES; GENERAL PROCESSES OF COMPOUNDING; INKS; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; ORGANIC MACROMOLECULAR COMPOUNDS; PAINTS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; PERFORMING OPERATIONS; POLISHES; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; USE OF MATERIALS THEREFOR; WOODSTAINS; WORKING-UP

The present invention provides an optical layered body which prevents the occurrence of curling (warpage), has excellent durability while maintaining pencil hardness, and can prevent the degradation of durability of an image display screen by external light by using the optical layered body as a protective film of the image display screen. An optical layered body including a light-transmitting substrate and at least a hard coat layer formed on the light-transmitting substrate, wherein the hard coat layer is formed by hardening a composition for a hard coat layer containing a polyfunctional (meth)acrylate ultraviolet curable resin, an ultraviolet absorber and a photopolymerization initiator by ultraviolet irradiation, and wherein the hard coat layer has a Martens hardness (A) of 230 to 320 N/mm2 at the surface opposite to the light-transmitting substrate and has a Martens hardness (B) of 160 to 250 N/mm2 at the surface on the side of the light-transmitting substrate, and the Martens hardness (A) is larger than