FOAM SHEET, LIGHT REFLECTION PLATE, BACK LIGHT PANEL, RESIN SHEET FOR PRODUCTION OF FOAM SHEET AND METHOD OF PRODUCING FOAM SHEET

• Main Authors: INAMORI KOJIRO, FUJINO HIDETOSHI, YOSHITANI TSUTOMU, MORITA NAGAYUKI, SUZUKI OSAMU, IKURA YUKIHIRO, KIMURA KAZUHIRO, MURAKAMI AKIHIRO, NOMURA SHINGO, KABUMOTO AKIRA, INOUE SHOTA, UMEMURA KOJI
• Format: Patent
• Language: English; Japanese
• Published: 18.12.2014
• Subjects: BLASTING; HEATING; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; LIGHTING; MECHANICAL ENGINEERING; NON-PORTABLE LIGHTING DEVICES; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PERFORMING OPERATIONS; PHYSICS; SYSTEMS THEREOF; TRANSPORTING; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLEEXTERIORS; WEAPONS

PROBLEM TO BE SOLVED: To provide a foam sheet which is formed with a specified uneven shape on the surface, with high accuracy, and shows excellent white spot resistance as a light reflection plate of a back light panel.SOLUTION: A foam sheet 10 composed of a thermoplastic resin includes a thermoplastic resin (A) layer 11 containing cells and a thermoplastic resin (B) layer 12 containing particles and no cells. The thermoplastic resin (B) layer 12 containing particles and no cells constitutes the outermost layer of the foam sheet 10 and has an arithmetic average roughness (Ra) of the surface of 0.5 μm<Ra<3 μm. 【課題】本発明は、表面に特定の凹凸が精度よく形成され、バックライトパネルの光反射板として優れたホワイトスポット耐性を示す発泡シートを提供する。【解決手段】熱可塑性樹脂からなる発泡シートであって、前記発泡シート１０は、気泡を含有する熱可塑性樹脂（Ａ）層１１と、粒子を含み気泡を含有しない熱可塑性樹脂（Ｂ）層１２とを有し、粒子を含み気泡を含有しない熱可塑性樹脂（Ｂ）層１２は発泡シート１０の最表層を構成し、かつ、表面の算術平均粗さ（Ｒａ）が０．５μｍ＜Ｒａ＜３μｍであることを特徴とする発泡シート。【選択図】図１