LAMINATED FILM

• Main Authors: MORI KENICHI, IWADE SHIGENORI, FUJITA ATSUSHI, ONO YUJI, NAKATANI MITSUHARU, SUGIMOTO YUKA
• Format: Patent
• Language: English; Japanese
• Published: 10.02.2022
• Subjects: LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; PERFORMING OPERATIONS; TRANSPORTING

To provide a laminated film capable of manufacturing a resin sheet having both high smoothness and excellent slipperiness without substantially adding particles into the resin sheet.SOLUTION: A laminated film is obtained by sequentially laminating a resin sheet 12 and a slippery layer 13 on at least one surface of a base material film 10. The base material film consisting of a polyester film satisfies the following (1)-(6): (1) the arithmetic average height (Sa) of the surface of the base material film laminated by the resin sheet is 20 nm or less, and the maximum projection height (P) is 200 nm or less; (2) the thickness (t1) of the resin sheet is 1 μm or more and 20 μm or less; (3) the slippery layer includes at least a binder resin and particles; (4) the thickness (t2) of the slippery layer is 0.001 μm or more and 1 μm or less; (5) the thickness (t2) of the slippery layer is 20% or less of the thickness (t1) of the resin sheet; and (6) a peeling force when peeling the resin sheet having the slippery layer from the base material film is 800 mN/25 mm width or less.SELECTED DRAWING: Figure 1 【課題】樹脂シート内部に実質的に粒子添加することなく高平滑で良好な滑り性を併せ持つ樹脂シートを製造できる積層フィルムを提供する。【解決手段】基材フィルム１０の少なくとも片面に樹脂シート１２、易滑層１３を順に積層してなる積層フィルムであって、基材フィルムがポリエステルフィルムからなり以下の（１）～（６）を満たす積層フィルム：（１）基材フィルムの樹脂シートを積層する面の算術平均高さ（Sa）が２０ｎｍ以下、最大突起高さ（P）が２００ｎｍ以下、（２）樹脂シートの膜厚（ｔ1）が１μｍ以上２０μｍ以下、（３）易滑層は、少なくともバインダー樹脂と粒子を含有する、（４）易滑層の膜厚（ｔ2）が０．００１μｍ以上１μｍ以下、（５）易滑層の膜厚（ｔ2）が樹脂シートの膜厚（ｔ1）の２０％以下、（６）基材フィルムから易滑層付き樹脂シートを剥離するときの剥離力が８００ｍＮ／２５ｍｍ幅以下。【選択図】図１