2 BIAXIALLY ORIENTED POLYESTER FILM FOR MOLD RELEASE

摘要

It consists of three layers and has a surface layer (A layer), an intermediate layer (B layer), and a surface layer (C layer), and the A layer has an inorganic particle having a volume average particle diameter (dA) of 0.1 μm or more and 1.0 μm or less and a Mohs hardness of 7 or less. / Or an organic particle containing 0.05% by weight or more and 1.0% by weight or less based on the weight of the layer A, a layer having a thickness of 3.0 μm or more and 8.0 μm or less, and the B layer has a volume average particle diameter (dB) of 0.3 μm or more and 1.5 μm or less And Mohs hardness is 7 or less inorganic particles and/or organic particles, and Mohs hardness is 7 or less inorganic particles are contained in an amount of 0.6% by weight or more and 6% by weight or less based on the weight of the layer B, and the organic particles are the weight of the layer B It contains 0.05% by weight or more and 5% by weight or less, and is a layer having a thickness of 10.0 μm or more and 35.0 μm or less, and the C layer is one or two in a particle size distribution curve having a volume average particle diameter (dC) of 0.2 μm or more and 1.0 μm or less. It is a layer having a thickness of 0.5 μm or more and 2.0 μm or less, containing an organic particle having two peaks in an amount of 0.03% by weight or more and less than 1.0% by weight based on the weight of the C layer, and satisfies the formula (1), and the thickness of the entire layer is The biaxially oriented polyester film for mold release which is 20 micrometers or more and 40 micrometers or less. dAdC≤dB...Equation (1)