Patent application number | Description | Published |
20090075049 | Microporous polyethylene film with good property of strength and permeability at high temperature - The present invention relates to a microporous polyethylene film for use as battery separator. The microporous polyethylene film according to the present invention is characterized by having a film thickness of 5-40 μm, a porosity of 35-55%, a permeability from 2.5×10 | 03-19-2009 |
20090148685 | Microporous polyolefin film possessing good mechanical properties and thermal stability - The present invention relates to a microporous polyolefin film suitable as a separator for batteries and thermal properties thereof. A microporous polyolefin film according to the present invention has a film thickness of 5-40 μm, a porosity of 30%-60%, a permeability of 2.0×10 | 06-11-2009 |
20090169862 | Microporous polyolefin multi layer film and preparing method thereof - The present invention relates to a multi-layered microporous polyolefin film for a battery separator and a method for preparing the same. The microporous multi-layered film of the present invention has a characteristics to have both the low shutdown temperature conferred by the polyethylene and the high melt fracture temperature conferred by the polypropylene and heat-resistant filler. In addition, it has the high strength and stability conferred by the micropores prepared under wet process and the high permeability and high strength conferred by the macropores prepared under dry process. Therefore, this multi-layered film can be used effectively to manufacture a secondary battery with high capacity and high power. | 07-02-2009 |
20110064929 | MICROPOROUS POLYOLEFIN FILM WITH THERMALLY STABLE POROUS LAYER AT HIGH TEMPERATURE - Provided is a microporous film for a secondary battery, and more particularly, to a microporous film for a secondary battery with excellent quality stability and heat resistance, the microporous film comprising a 3 layer microporous film wherein: an inner layer that includes polypropylene of 20-80 wt % having a melting temperature of 150° C. or higher and a filler of 80-20 wt % having a melting temperature of 140° C. or higher, wherein a gross content of the filler and polypropylene in the inner layer is 60 wt % or more, and both surface layers which include polyethylene, wherein at least one layer of the both surface layers includes polyethylene of 70 wt % or more. | 03-17-2011 |
20110266707 | MICROPOROUS POLYOLEFIN MULTI LAYER FILM AND PREPARING METHOD THEREOF - The present invention relates to a multi-layered microporous polyolefin film for a battery separator and a method for preparing the same. The microporous multi-layered film of the present invention has a characteristics to have both the low shutdown temperature conferred by the polyethylene and the high melt fracture temperature conferred by the polypropylene and heat-resistant filler. In addition, it has the high strength and stability conferred by the micropores prepared under wet process and the high permeability and high strength conferred by the macropores prepared under dry process. Therefore, this multi-layered film can be used effectively to manufacture a secondary battery with high capacity and high power. | 11-03-2011 |
20110268942 | MICROPOROUS POLYOLEFIN MULTI LAYER FILM AND PREPARING METHOD THEREOF - The present invention relates to a multi-layered microporous polyolefin film for a battery separator and a method for preparing the same. The microporous multi-layered film of the present invention has a characteristics to have both the low shutdown temperature conferred by the polyethylene and the high melt fracture temperature conferred by the polypropylene and heat-resistant filler. In addition, it has the high strength and stability conferred by the micropores prepared under wet process and the high permeability and high strength conferred by the macropores prepared under dry process. Therefore, this multi-layered film can be used effectively to manufacture a secondary battery with high capacity and high power. | 11-03-2011 |
20120070644 | Microporous Polyolefin Multilayer Film Possessing Good Mechanical Properties and Thermal Stability - Provided is a microporous polyolefin multilayer film which may be used as a separator for a battery, and a method for preparing the same. At least one layer of the microporous polyolefin multilayer film contains 90˜100 wt % of polyethylene having a melting temperature of 130˜140° C. and at least the other layer has 20 wt % or more of a heat resistant resin and 80 wt % or less of a filler selected from the group consisting of an organic filler, an inorganic filler and a mixture thereof. The heat resistant resin is preferably a semi crystalline polymer or an amorphous polymer. Preferably, the semi crystalline polymer has a degree of crystallinity of 10-45% or a heat of fusion for melting of 20˜90 J/g and has a melting temperature of 145˜250° C. and a glass transition temperature of −100˜90° C. Also, preferably, the amorphous polymer has no crystal and has a glass transition temperature of 90˜120° C. | 03-22-2012 |
20120156570 | Microporous Polyethylene Film with Good Property of Strength and Permeability at High Temperature - The present invention relates to a microporous polyethylene film for use as battery separator. The microporous polyethylene film according to the present invention is characterized by having a film thickness of 5-40 μm, a porosity of 35-55%, a permeability from 2.5×10 | 06-21-2012 |
20130177755 | MICROPOROUS POLYOLEFIN FILM AND METHOD FOR PREPARING THE SAME - Provided are a microporous polyolefin film usable as a separator for a lithium ion secondary battery and a method for preparing the same, the microporous polyolefin film including one or more layers, wherein the microporous polyolefin has a thickness of 5˜40 μm, a porosity of 30˜60%, a puncture strength of 0.22 N/μm or higher, and a quality factor of 20 gf/(sec/100 cc) or greater, so that the microporous polyolefin film can have excellent mechanical strength, permeability, and heat shrinkage characteristics, and thus, is suitably used for a separator for a high-capacity and high-output battery. | 07-11-2013 |