{
  "$type": "site.standard.document",
  "description": "Provided is a porous polypropylene film that is safe and has low air permeation resistance. A porous polypropylene film of the present invention includes a polypropylene resin and a ²-crystal nucleating agent, in which a temperature at which a heat shrinkage rate of a dimension in a width direction…",
  "path": "/patents/981047",
  "publishedAt": "2013-12-11T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "C08J5/18",
    "TORAY INDUSTRIES [JP]"
  ],
  "textContent": "Provided is a porous polypropylene film that is safe and has low air permeation resistance. A porous polypropylene film of the present invention includes a polypropylene resin and a ²-crystal nucleating agent, in which a temperature at which a heat shrinkage rate of a dimension in a width direction of the film is 5% is 130 to 200 °C, air permeation resistance is 50 to 500 sec/100 ml, porosity is 35 to 70%, and when porosity is µ and air permeation resistance is G, a relation of the both satisfies the following expression (1): G + 15 × µ ¤ 1 , 200",
  "title": "POROUS POLYPROPYLENE FILM, SEPARATOR FOR ELECTRICITY STORAGE DEVICE, AND ELECTRICITY STORAGE DEVICE"
}