Patent ID: 8951456
Filing Date: 2015-02-10
Classification: B29C,B29D,B29K,C08J

Abstract:
1. A method for producing an ultra-high-molecular-weight polyethylene porous membrane, comprising: a step of molding a film using an ultra-high-molecular-weight polyethylene raw material having a viscosity average molecular weight of from 1,000,000 to 12,000,000; a step of biaxially stretching the film obtained in the above step, in X-axis and Y-axis directions in a temperature range of from a melting point of the film to 180° C.; a step of shrinking the biaxially stretched film obtained in the above step, along at least one axis of the X-axis or Y-axis; and a pore-forming step of stretching the shrunk film obtained in the above step, along at least one axis of the X-axis or Y-axis in a temperature range of from 142° C. to 170° C.