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AssigneeToyo Boseki Kabushiki Kaisha
InventorsToshiyuki Shimizu, Naofumi Kajita, Yasumasa Morimoto
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Disclosed is a polyamide resin film which has excellent dimensional stability with respect to moisture absorption, excellent mechanical characteristics and sliding properties under high temperature and high humidity conditions, and excellent handling properties. Specifically disclosed is a biaxially stretched polyamide resin film, to which 0.3-10% by weight of an inorganic material including a layered compound is added. The biaxially stretched polyamide resin film is characterized in that the layered compound is in-plane oriented, and that the film has a haze of 1.0-20%, an elastic modulus in the longitudinal direction of 1.7-3.5 GPa at a relative humidity (RH) of 35%, a surface roughness (Sa) of 0.01-0.1 μm, and a coefficient of static friction (F/B) of 0.3-1.0 at a normal stress of 0.5 N/cm2.
A biaxially stretched polyamide resin film containing 0.3 to 10 wt. % of an inorganic material including an layered compound, wherein the layered compound is in-plane oriented and the film has a haze of 1.0 to 20%, an elastic modulus in the longitudinal direction of 1.7 to 3.5 GPa at a relative humidity of 35% RH, a surface roughness (Sa) of 0.01 to 0.1 and a static friction coefficient (F/B) of 0.3 to 1.0 at a normal stress of 0.5 N/cm2.
A biaxially stretched multilayer polyamide resin film having 8 or more layers in total and using a same resin composition for 80% based on the ratio of the number of the layers, wherein the film is stretched 2.5 to 5.0 times in the longitudinal direction of the film and has an in-plane orientation coefficient (ΔP) of 0.057 to 0.07 and a strain of 0.1 to 2.0% after boiling treatment.
Dependencies are inferred from the claim text.