发明授权
EP2891677B1 METHOD FOR MANUFACTURING POLYETHYLENE POROUS FILM AND POLYETHYLENE POROUS FILM 有权
制备聚乙烯多孔膜和聚乙烯多孔膜的方法

METHOD FOR MANUFACTURING POLYETHYLENE POROUS FILM AND POLYETHYLENE POROUS FILM
摘要:
Disclosed is a polyethylene porous film having an average pore diameter of 200 nm or less, a specific surface area of 50 m 2 /g or more, and a porosity of 15% or more, each of which is measured by a mercury intrusion method at room temperature, the polyethylene porous film being obtained by forming pores only by drawing a film containing an ultrahigh molecular weight polyethylene having a viscosity average molecular weight of from 1 million to 15 million and a polyethylene having a weight average molecular weight of from 10,000 to 800,000 at a mass ratio of from 50:50 to 99:1. The polyethylene porous film is produced by molding a film using a mixture of the ultrahigh weight polyethylene and the polyethylene having a weight average molecular weight of from 10,000 to 800,000, biaxially drawing the film, then heat-treating and redrawing the film to form pores in the film.
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