Patent application number | Description | Published |
20090008816 | METHOD FOR PRODUCING MICROPOROUS POLYOLEFIN MEMBRANE AND MICROPOROUS MEMBRANE - A microporous polyolefin membrane having excellent compression resistance is obtained by stretching a gel molding comprising a polyolefin and a membrane-forming solvent, removing the membrane-forming solvent, and stretching the resultant membrane again at least uniaxially at a speed of 3%/second or more at a temperature equal to or lower than the crystal dispersion temperature +20° C. | 01-08-2009 |
20090072434 | Coextrusion die and manifold system therefor - A coextrusion die for producing a multilayer film or sheet of thermoplastic materials. The coextrusion die includes a die outlet through which a layered melt stream of the thermoplastic materials is extruded as a multilayer film or sheet, a first die section for producing a core layer, the first die section having a flat manifold, the flat manifold having a feed entrance and a pressure manifold in communication with the slotted die outlet, a second die section for producing a first skin layer, the second die section having a cross flow manifold, the cross flow manifold having a flow path wherein a portion of a melt stream of the thermoplastic material traverses the second die section's length more than once, the cross flow manifold having a feed entrance and a pressure manifold in communication with the slotted die outlet, and a third die section for producing a second skin layer, the third die section having a cross flow manifold, the cross flow manifold having a flow path wherein a portion of a melt stream of the thermoplastic material traverses the third die section's length more than once, the cross flow manifold having a feed entrance and a pressure manifold in communication with the slotted die outlet. A process for making a multilayer extrudate of thermoplastic materials is also provided. | 03-19-2009 |
20090079102 | METHOD FOR PRODUCING MICROPOROUS POLYOLEFIN MEMBRANE - A method for producing a microporous polyolefin membrane by extruding a melt blend comprising a polyethylene resin, polypropylene having a mass-average molecular weight of 1×10 | 03-26-2009 |
20090098341 | MICROPOROUS POLYOLEFIN MEMBRANE AND METHOD FOR PRODUCING THE SAME - The microporous polyolefin membrane obtained by stretching a gel molding comprising a polyolefin and a membrane-forming solvent at least uniaxially, heat-setting it, removing the membrane-forming solvent, and re-stretching it at least uniaxially has a large pore diameter and excellent air permeability, mechanical strength and compression resistance. | 04-16-2009 |
20090098450 | MULTI-LAYER, MICROPOROUS POLYOLEFIN MEMBRANE, ITS PRODUCTION METHOD, AND BATTERY SEPARATOR - (1) a combination of a microporous layer made of a polyethylene resin and a microporous layer made of polypropylene and a heat-resistant resin having a melting point or a glass transition temperature of 170° C. or higher, or (2) a combination of a microporous layer made of a polyethylene resin and a microporous layer made of polypropylene and inorganic filler having an aspect ratio of 2 or more provides a multi-layer, microporous polyolefin membrane with well-balanced permeability, mechanical strength, heat shrinkage resistance, shutdown properties and meltdown properties. | 04-16-2009 |
20090117453 | MULTI-LAYER, MICROPOROUS POLYETHYLENE MEMBRANE, AND BATTERY SEPARATOR AND BATTERY USING SAME - A multi-layer, microporous polyethylene membrane having at least three layers comprising (a) a first microporous layer amount of a polyethylene resin and constituting at least both surface layers, and (b) at least one second microporous layer made of a polyethylene resin, a heat-resistant resin having a melting point or glass transition temperature of 150° C. or higher and a filler, and sandwiched by both surface layers. | 05-07-2009 |
20090117455 | MULTI-LAYER, MICROPOROUS POLYETHYLENE MEMBRANE, ITS PRODUCTION METHOD, AND BATTERY SEPARATOR - A multi-layer, microporous polyethylene membrane having at least two layers, which comprises (a) a microporous polyethylene resin layer A comprising high-density polyethylene A having 0.2 or more terminal vinyl groups per 10,000 carbon atoms when measured by infrared spectroscopy, and (b) a microporous polyethylene resin layer B comprising high-density polyethylene B having less than 0.2 terminal vinyl groups per 10,000 carbon atoms when measured by infrared spectroscopy, has well-balanced permeability, mechanical strength, heat shrinkage resistance, shutdown properties, meltdown properties and oxidation resistance. | 05-07-2009 |
20090127733 | METHOD FOR PRODUCING MICROPOROUS THERMOPLASTIC RESIN MEMBRANE - A method for producing a microporous thermoplastic resin membrane from a thermoplastic resin and a membrane-forming solvent, using as part of a starting material film waste based on the thermoplastic resin and the membrane-forming solvent, which is generated in the production process of the microporous thermoplastic resin membrane, comprising the steps of melt-blending a virgin thermoplastic resin and a membrane-forming solvent in an extruder to prepare a virgin material solution, adding the film waste generated in the same or different production processes to the virgin material solution in a molten state in the extruder at an intermediate point, melt-blending them to prepare a thermoplastic resin solution, extruding the thermoplastic resin solution through a die, cooling the extrudate to form a gel-like sheet, and removing the membrane-forming solvent from the gel-like sheet. | 05-21-2009 |
20090134538 | METHOD FOR PRODUCING MULTI-LAYER, MICROPOROUS POLYOLEFIN MEMBRANE - A multi-layer, microporous polyolefin membrane comprising a polypropylene layer and a polyethylene resin layer and having well-balanced permeability, mechanical strength, heat shrinkage resistance, shutdown properties and meltdown properties can be obtained by (1) forming a sheet comprising a gel-like polypropylene layer containing a membrane-forming solvent or a polypropylene layer containing no membrane-forming solvent and a gel-like polyethylene resin layer containing a membrane-forming solvent, stretching the sheet at two-stage temperatures, and then removing the membrane-forming solvent, or (2) forming a gel-like polypropylene sheet containing a membrane-forming solvent or a polypropylene sheet containing no membrane-forming solvent, and a gel-like polyethylene resin sheet containing a membrane-forming solvent, stretching them at two-stage temperatures, removing the membrane-forming solvent, and then laminating the resultant microporous polypropylene membrane and the resultant microporous polyethylene membrane. | 05-28-2009 |
20090146334 | METHOD FOR PRODUCING MICROPOROUS POLYOLEFIN MEMBRANE AND MICROPOROUS MEMBRANE - A microporous polyolefin membrane having large pore diameters and excellent air permeability, mechanical strength and compression resistance can be obtained by (a) stretching a gel molding comprising a polyolefin and a membrane-forming solvent at least uniaxially at a temperature from the crystal dispersion temperature of the polyolefin +15° C. to the crystal dispersion temperature of the polyolefin +40° C., removing the membrane-forming solvent, and then stretching again the resultant membrane to 1.1 to 2.5 fold at least uniaxially, or by (b) stretching the gel molding at least uniaxially, bringing the stretched film into contact with a hot solvent before and/or after removing the membrane-forming solvent, and then stretching again the resultant membrane to 1.1 to 2.5 fold at least uniaxially. | 06-11-2009 |
20090148761 | MULTI-LAYER, MICROPOROUS POLYETHYLENE MEMBRANE, BATTERY SEPARATOR FORMED THEREBY AND BATTERY - A multi-layer, microporous polyethylene membrane comprising (a) a first microporous layer made of a polyethylene resin, and (b) a second microporous layer comprising a polyethylene resin, and a heat-resistant polymer having a melting point or a glass transition temperature of 170° C. or higher, the heat-resistant polymer being dispersed in the form of fine particles in the polyethylene resin, and the second microporous layer having pores containing fine particles of the heat-resistant polymer as nuclei from which the cleavage of polyethylene resin fibrils starts, the multi-layer microporous polyethylene membrane having well-balanced shutdown properties, meltdown properties, permeability, mechanical strength, heat shrinkage resistance and compression resistance. | 06-11-2009 |
20090253032 | MULTI-LAYER, MICROPOROUS POLYOLEFIN MEMBRANE, ITS PRODUCTION METHOD, BATTERY SEPARATOR, AND BATTERY - A multi-layer, microporous polyolefin membrane comprising first microporous layers constituting at least both surface layers and at least one second microporous layer disposed between both surface layers; said first microporous layer being made of a first polyolefin comprising (i) polypropylene, or (ii) a mixture of 50% or more by mass of polypropylene and a polyethylene resin; said second microporous layer being made of a second polyolefin comprising (i) a mixture of 7% or less by mass of ultra-high-molecular-weight polyethylene having weight-average molecular weight of 1×10 | 10-08-2009 |
20100248002 | Microporous Multilayer Membrane, System And Process For Producing Such Membrane, And The Use Of Such Membrane - The invention relates to a multilayer microporous membrane comprising polyethylene and polypropylene and having an improved balance of properties including improved thickness variation in at least one planar direction. The invention also relates to a system and method for producing such a membrane, the use of such a membrane as a battery separator film, and batteries containing such a membrane. | 09-30-2010 |