METHOD FOR MANUFACTURING POLYESTER FILM AND HEATING ROLL FOR FILM FORMING

• Main Authors: TSUSHIMA TAKAAKI, KAWAUCHI YUICHI, KITAGAWA TOSHIHISA, TANIGUCHI KOJI, OTA KOJI
• Format: Patent
• Language: English; Japanese
• Published: 04.10.2018
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; CHEMISTRY; COMPOSITIONS BASED THEREON; GENERAL PROCESSES OF COMPOUNDING; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL; WORKING-UP

PROBLEM TO BE SOLVED: To provide a method for manufacturing polyester film and a heating roll for film forming with the reduced occurrence of separation unevenness.SOLUTION: The method for manufacturing polyester film includes: a preheating step of a polyester film using a heating roll having a surface layer containing a silicone resin satisfying the relation: Pa/Pb≤2.0, where Pa: a maximum absorption peak intensity derived from the Si-H stretching vibration in the range of 2079 cm- 2415 cmobtained by a Fourier transform infrared spectroscopy-attenuated total reflectance method under the condition of infrared light incident angle of 45°, and Pb: a maximum absorption intensity derived from the Si-O-Si stretching vibration in the range of 1040 cm-1060 cm, and having a thickness of 0.5 μm-3.0 μm, and the surface temperature T (°C) of the surface layer satisfies Tg≤T (°C)≤(Tg+10); and a step for stretching the preheated polyester film, where Tg is the glass transition temperature of the polyester film.SELECTED DRAWING: Figure 1 【課題】剥離ムラの発生を低減させたポリエステルフィルムの製造方法及びフィルム成形用加熱ロールを提供する。【解決手段】ポリエステルフィルムの製造方法は、赤外光入射角４５°の条件でフーリエ変換赤外分光減衰全反射法により求められる、２０７９ｃｍ−１〜２４１５ｃｍ−１の範囲におけるＳｉ−Ｈの伸縮振動に由来する最大吸収ピーク強度Ｐａと、１０４０ｃｍ−１〜１０６０ｃｍ−１の範囲におけるＳｉ−Ｏ−Ｓｉの伸縮振動に由来する最大吸収ピーク強度Ｐｂと、がＰａ／Ｐｂ≦２．０を満たすシリコーン樹脂を含み、かつ、厚さが０．５μｍ〜３．０μｍである表面層を有し、前記表面層における表面温度Ｔ（℃）がＴｇ≦Ｔ（℃）≦（Ｔｇ＋１０）を満たす加熱ロールを用いて、ポリエステルフィルムを予熱する工程と、予熱された前記ポリエステルフィルムを延伸する工程とを有する。Ｔｇはポリエステルフィルムのガラス転移温度を示す。【選択図】図１