Micro-Porous Polyolefin Composite Film Having Excellent Heat Resistance and Stability and Method for Producing the Same

摘要

Provided is a micro-porous polyolefin composite film, the micro-porous polyolefin composite film including a porous coating layer containing a polymer binder and inorganic particles, the polymer binder simultaneously employing an aqueous polymer and a non-aqueous polymer. The contents of the aqueous polymer and the non-aqueous polymer are controlled, and thus optimize heat resistance, adhesive strength, and the moisture content to thereby improve high-temperature stability, and, further, improve the adhesive strength to thereby improve stability in production, and minimize the moisture content to thereby improve reliability of a battery.

主权项

1. A micro-porous polyolefin composite film formed by coating or laminating a solution containing a polymer binder and inorganic particles on a micro-porous polyolefin film as a base layer, wherein the polymer binder includes 50 to 90 wt % of a non-aqueous polymer having a glass transition temperature (Tg) of −60° C. to 0° C. and 50 to 10 wt % of an aqueous polymer having a melting point (Tm) or a glass transition temperature (Tg) of 200° C. or higher and a surface tension of 65 dyne/cm or less in a state of 0.5 wt % of an aqueous solution thereof at 20° C.