Teijin Dupont Films Japan Limited

Hiroshi Kusume

Atsushi Oyamatsu

Tetsuo Yoshida

A laminated film for a reflecting plate is provided that comprises a layer A and a layer B, the layer A comprising a polyester that comprises substantially no antimony element and preferably comprises 1 to 25 wt % of inert particles having an average particle diameter of 0.3 to 3.0 &#x3bc;m and the layer B being in contact with the layer A and comprising a polyester which preferably comprises 31 to 80 wt % of inert particles having an average particle diameter of 0.3 to 3.0 &#x3bc;m. This laminated film has a practically satisfactory capability of reflecting visible light, can be produced stably even if inert particles are added in high concentration, hardly has streak-like defects, and can be suitably used as a substrate for a reflecting plate for a liquid crystal display or an internally illuminating electrical billboard.

Laminated film for reflection plate

There is provided a white polyester film which retains practically satisfactory reflectivity with respect to the visible light range, can undergo stable film production even when inorganic fine particles are added in high concentration and is stable against a dimensional change caused by heat generated from a light source. The polyester film is a polyester film which comprises a composition comprising a copolyester and 30 to 50 wt % of inorganic fine particles based on the composition, shows a thermal shrinkage at 85&#xb0; C. in longitudinal and transverse directions of not higher than 0.7% and a thermal shrinkage at 150&#xb0; C. in the longitudinal and transverse directions of not higher than 5.0%, and shows an average reflectance at a wavelength of 400 to 700 nm of not lower than 90%.

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Gifu, Japan

Hiroshi Kusume