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AssigneeAsahi Kasei Kogyo Kabushiki Kaisha
InventorsTakashi Yamada, Masayuki Nakatani
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An aromatic polyamide film is disclosed, which contains micro-particles in an amount in a range from 0.001 to 10% by weight, characterized in that, at least on one film surface, a distribution density of projections having a height in a range from 0.01 .mu.m to 0.05 .mu.m is in a range from 10.sup.2 to 10.sup.7 /mm.sup.2 ; that of projections having a height in a range from 0.27 .mu.m to less than 0.54 .mu.m is in a range from 0 to 5/cm.sup.2 ; that of projections having a height in a range from 0.54 .mu.m to less than 0.81 .mu.m is in a range from 0 to 2/10 cm.sup.2 ; and that of projections having a height of 0.81 .mu.m or more is in a range from 0 to 0.5/100 cm.sup.2. The aromatic polyamide film has both satisfactory slipperiness and surface smoothness, and is suitably used as an electro-insulating material for a high rotational speed electric appliance, a base film for a solar cell, or a flexible printed circuit board. This aromatic polyamide film is prepared by preparing a dispersion of inorganic or organic micro-particles well dispersed in a solvent for the aromatic polyamide, filtering the dispersion, preparing an aromatic polyamide solution while using this dispersion as a solvent, and forming the film from the solution after filtering the solution.
An aromatic polyamide film containing micro-particles in an amount in a range from 0.001 to 10% by weight, characterized in that, at least on one film surface, a distribution density of projections having a height in a range from 0.01 .mu.m to 0.05 .mu.m is in a range from 10.sup.2 to 10.sup.7 /mm.sup.2 ;
An aromatic polyamide film as defined by any one of the preceding claims, wherein the aromatic polyamide is a para-oriented aromatic polyamide.
A magnetic recording medium comprising:
A solar cell comprising:
A method for producing an aromatic polyamide film by a dry or wet film formation system from an aromatic polyamide solution, comprising:
Dependencies are inferred from the claim text.