Patent application number | Description | Published |
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 |
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 |
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 |
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 |
20090269656 | MICROPOROUS POLYETHYLENE MEMBRANE, ITS PRODUCTION METHOD, AND BATTERY SEPARATOR - A microporous polyethylene membrane made of a polyethylene resin having a ratio (mass-average molecular weight/number-average molecular weight) of 5 to 300 and comprising 1% or more by mass of ultra-high-molecular-weight polyethylene having a mass-average molecular weight of 7×10 | 10-29-2009 |