| 摘要 |
<p>A method of producing a microporous membrane comprising the steps of: extruding a polymer at a temperature of from (polymer melting point + 10 °C) to (polymer melting point + 100 °C); drawing the extruded polymer at a rate of 5 ~ 120 m/min in 10 ~ 150 °C to obtain a polymer film; annealing the polymer film at a temperature of from (polymer melting point - 100 °C) to (polymer melting point - 5 °C) for 10 seconds to 1 hour; irradiating both surfaces of the annealed polymer film with an ion-particle amount of 10?2 ~ 1020 ion/cm2¿ energized at 10?-2 ~ 107¿ KeV, at an irradiating distance of 5 ~ 100 cm under a vacuum of 10?-2 ~ 10-8¿ torr; cold stretching the irradiated polymer film at a temperature of from - 20 °C to (polymer melting point - 40 °C); hot stretching the cold stretched polymer film at a temperature of from (polymer melting point - 40 °C) to (polymer melting point - 5 °C); and heat setting the hot stretched polymer film at a temperature of from (polymer melting point - 80 °C) to (polymer melting point - 5 °C).</p> |
