Patent ID: 8486519
Filing Date: 2013-07-16
Classification: G02B,Y10T

Abstract:
1. A white film for a reflecting structure for surface light source comprising: a film containing voids formed by melt extrusion of a mixture of a polyester resin and a resin not miscible with the polyester resin and/or organic or inorganic fine particles, and then stretching in at least one direction, and a light stabilizer-containing coating layer comprising a copolymer of 1) a resin component and 2) a light stabilizer component comprising a hindered amine and a benzotriazole, the copolymer having a molecular weight of at least 20,000, and having a thickness of 5 to 10 μm formed on at least one surface of the film, wherein the white film has 1) a mean reflectance of at least 85%, measured on the light stabilizer-containing coating layer thereof exposed to light having a wavelength of from 400 to 700 nm and 2) a degree of glossiness of at most 40% as measured on the light stabilizer-containing coating layer thereof.