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The roughening of biaxially oriented polypropylene film using polypropylene (PP) blended with low melting point polymers such as polybutene‐1 and high‐density polyethylene as raw resin in a successively stretching tenter method has been studied for the same reasons as has the roughening of BOP utilizing β crystals. Rough‐surface BOPs with a low depth and a high density of roughness were obtained by using the blended PPs as raw resins. By combining this roughening method with the roughening method utilizing the β crystals, rough‐surface BOPs with a crater‐like large roughness and a fine roughness on the ground were obtained. These rough‐surface BOPs showed excellent impregnation properties of insulating oils.
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Fujiyama et al. (1988) studied this question.
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