RELEASE FILM AND LAMINATE

• Main Authors: OHASHI JUNPEI, KAI RINKO, ISHIDA YASUYUKI
• Format: Patent
• Language: English; Japanese
• Published: 06.08.2020
• 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 release film which endures transportation and processing in a post-process, in which a resin layer formed on a release layer is unlikely to lose function and finally peels off uniformly in the plane to be transferred on a molded body or to be formed into a resin film, or to provide a laminate.SOLUTION: A release film has a release layer 4 at least on one surface of a support base material 3 and satisfies the following. Condition 1: A surface free energy A of the release layer is 35 mN/m or larger and 45 mN/m or smaller. Condition 2: A surface free energy change ΔΓ of the release layer is 8 or smaller. (ΔΓ=surface free energy B - surface free energy A; surface free energy A: surface free energy of the release layer, surface free energy B: surface free energy of the release layer after a surface of the release layer is scraped 10 times with a cotton cloth wetted with methyl ethyl ketone under surface pressure of 200 g/cmof the release layer at 25°C). Condition 3: surface elasticity due to an atomic force microscope of the release layer is 300 MPa or larger and 1500 MPa or smaller.SELECTED DRAWING: Figure 1 【課題】離型層上に形成された樹脂層の機能を損ないにくく、後工程で搬送や加工に耐え、最終的に樹脂層が面内均一に剥離し、成型体に転写したり、樹脂フィルムを製造したりすることができる離型フィルム、または積層体を提供する。【解決手段】支持基材３の少なくとも一方の面に離型層４を有し、以下を満たす。条件１：前記離型層の表面自由エネルギーＡが、３５ｍＮ/ｍ以上４５ｍＮ/ｍ以下である。条件２：前記離型層の表面自由エネルギー変化ΔΓが、８以下である。（ΔΓ＝表面自由エネルギーＢ−表面自由エネルギーＡ；表面自由エネルギーＡ：離型層の表面自由エネルギー、表面自由エネルギーＢ：離型層の表面を、２５℃、２００ｇ／ｃｍ２の面圧で、メチルエチルケトンを含ませた綿布で１０回擦過後の、離型層の表面自由エネルギー）。条件３：前記離型層の原子間力顕微鏡による表面弾性率が、３００ＭＰａ以上１５００ＭＰａ以下である。【選択図】図１