BIAXIALLY STRETCHED POLYESTER FILM, MOLDED PLASTIC PRODUCT USING THE SAME, AND MANUFACTURING METHOD OF THE SAME

• Main Authors: NAKURA NOBUYUKI, OHIRA TAKAYUKI, IKEDA SADAFUMI
• Format: Patent
• Language: English; Japanese
• Published: 27.10.2014
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; GENERAL PROCESSES OF COMPOUNDING; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS; WORKING-UP

PROBLEM TO BE SOLVED: To provide a biaxially stretched polyester film including excellent irregularity processability.SOLUTION: There is provided a biaxially stretched polyester film having void therein, in which cushion rate (0-50)(%) calculated by Expression 1 is 5.0% or more when film thickness when a load obtained by conditions below is not added is T0 (μm), and film thickness when a 50 g load is added is T1 (μm). The cushion rate (0-50)(%)=(T0-T1)/T0×100 (Expression 1) Film thickness measurement conditions when a load is added: film is cut out into the size of 5 cm×5 cm as a test piece, a 10 mm standard gauge head (No.101117) of flat type is attached to a dial gauge (manufactured by Mitutoyo Corporation, No.2109-10), and thickness T0 (μm) when load is not added and the thickness T1 (μm) when the 50 g load is added to the test piece are measured. 【課題】本発明は、優れた凹凸加工性を備えた二軸延伸ポリエステルフィルムを提供することを目的とする。【解決手段】内部にボイドを有する二軸延伸ポリエステルフィルムであって、下記条件にて求められる荷重が加えられていないときのフィルム厚みをＴ０（μｍ）、５０ｇ荷重を加えたときのフィルム厚みをＴ１（μｍ）としたとき、式１により算出されるクッション率（０−５０）（％）が５．０％以上である二軸延伸ポリエステルフィルム。クッション率（０−５０）（％）＝（Ｔ０−Ｔ１）／Ｔ０?１００ （式１）荷重を加えたときのフィルム厚み測定条件：フィルムを５ｃｍ?５ｃｍの大きさに切り出して試験片とし、ダイアルゲージ（株式会社ミツトヨ製、Ｎｏ．２１０９−１０）に１０ｍｍ 平型の標準測定子（Ｎｏ．１０１１１７）を取り付け、上記試験片に荷重を加えていないときの厚さＴ０（μｍ）、５０ｇ荷重を加えた際の厚さＴ１（μｍ）を測定する。【選択図】なし