Patent ID: 6027770
Filing Date: 2000-02-22
Classification: B29C,B29K,C08J,C08K

Abstract:
A process for manufacturing a functional polyolefinic film comprising:(i) molding a tubular film from a composition consisting of 100 parts by weight of a polyolefinic resin and 20-300 parts by weight of an inorganic filler having an average 0.1-20 .mu.m diameter of particles;(ii) treating an outer surface of the tubular film with a corona discharge at an application power of within 50-3000 W/m.sup.2 /minute, and at a separate time, treating an inner surface of the tubular film with a corona discharge at a higher application power, thereby making at least one physical property value of the film selected from the group consisting of tearing strength, strength of rupture, elongation at rupture and shock strength has a relative value of less than 70 after the corona discharge application compared with 100 as the corresponding physical property value before corona discharge application.