| Patent application number | Description | Published |
|---|
| 20090023825 | Microporous polyethylene film and method of producing the same - Disclosed is a microporous polyethylene film for a battery separator and a method of producing the same. The microporous polyethylene film comprises a resin mixture, which includes 100 parts by weight of composition containing 20-50 wt % polyethylene with a weight average molecular weight of 5×10 | 01-22-2009 |
| 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 |
| 20090130547 | Microporous polyethylene film with improved strength, permeability and surface energy - The present invention relates a microporous polyethylene film with improved mechanical strength, porosity, pore size and, particularly, improved surface energy, thereby having improved electrolyte wettability and being adequate for use as separators in high-capacity and long lifetime lithium secondary batteries. The microporous polyethylene film of the present invention is characterized by having a surface energy of at least 50 dynes/cm | 05-21-2009 |
| 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 |
| 20100041779 | Preparing Method of Microporous Polyolefin Film Through Effective Extrusion - The present invention relates to a process for manufacturing a microporous polyolefin film which can be used for various battery separators, separating filters and membranes for microfiltration. The process for manufacturing a microporous polyolefin film according to the invention comprises mixing/extrusion through efficient and separate injection of 15-55% by weight of polyolefin (Component I), and 85-45% by weight of a diluent (Component II) which forms thermodynamic single phase with the polyolefin and a diluent (Component III) which can undergo thermodynamic liquid-liquid phase separation with the polyolefin, into an extruder. | 02-18-2010 |
| 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 |
| 20110104468 | MICROPOROUS POLYOLEFIN MULTI LAYER FILM AND PREPARING METHOD THEREOF - Disclosed is a microporous polyolefin multilayer film which can be used as a separator for a battery, and a preparing method thereof. The microporous polyolefin multilayer film is a trilayer microporous film which is prepared by a wetting method to have both surface layers containing polyethylene of 95 wt % or more having a melting temperature of 125° C. or more, and an intermediate layer containing polypropylene of 50 to 90 wt % having a melting temperature of 160° C. or more and polyethylene of 10 to 50 wt % having a melting temperature of 125° C. or more, wherein a thickness of the film is 9-50 μm, a puncture strength is 0.15 N/μm or more, a permeability is 1.5×10 | 05-05-2011 |
