Biaxially-oriented polypropylene film
AssigneeToyobo Co., Ltd.
InventorsMahiro NAKANO, Toru IMAI
Life of this patent
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Abstract
The invention provides a biaxially-oriented polypropylene film that contains a base layer (A) comprising a polypropylene resin as a main component, a surface layer (B) provided at one side of the base layer (A), and a surface layer (C) provided at one side of the base layer (A) opposite to the surface layer (B), wherein the surface layer (B) has a wetting tension of 38 mN or more, a surface resistance value of 14.0 LogΩ or more, an arithmetic average roughness (Ra) of 3.0-5.5 nm, a Martens hardness of 248 N/mm2 or less, and a center plane average surface roughness (SRa) of 0.010-0.026 µm, and the surface layer (C) has a center plane average surface roughness (SRa) of 0.020 µm or more and a Martens hardness of 270 N/mm2 or more.
Claims8
A biaxially-oriented polypropylene film, comprising
- a base layer (A) comprising a polypropylene resin as a main component,
- a surface layer (B) provided at one side of the base layer (A), and
- a surface layer (C) provided at one side of the base layer (A) opposite to the surface layer (B),
- wherein the surface layer (B) satisfies the following (1) to (5) and the surface layer (C) satisfies the following (6) and (7):
- (1) the surface layer (B) has a wetting tension of 38 mN or more;
- (2) the surface layer (B) has a surface resistance value of 14.0 LogΩ or more;
- (3) the surface layer (B) has an arithmetic average roughness (Ra) of 3.0 nm or more and 5.5 nm or less;
- (4) the surface layer (B) has a Martens hardness of 248 N/mm2 or less;
- (5) the surface layer (B) has a center plane average surface roughness (SRa) of 0.010 or more and 0.026 µm or less;
- (6) the surface layer (C) has a center plane average surface roughness (SRa) of 0.020 µm or more;
- (7) the surface layer (C) has a Martens hardness of 270 N/mm2 or more.
Dependencies are inferred from the claim text.