PURPOSE: To obtain excellent slipperiness, abrasion resistance and electromagnetic conversion characteristics by a method wherein soft particles having low strength are included and, at the same time, surface projections, which are longer in longitudinal direction, are formed.
CONSTITUTION: The film concerned has the lamination structure consisting of two or more layers. At least one side outermost layer part contains 0.005-3wt.% of organic polymer particles, the average primary diameter of each of which is 0.1-3μm and the strength S10 of each of which under 10% deformation is 0-10kgf/mm2. The ratio β1/β2 of the tip radii of curvature of projections in the longitudinal direction and in the width direction of the film of the projections produced by the particles on the surface of the film lies within the range of 1.1-3.0.
OKAZAKI IWAO
ABE KOICHI
