{
  "$type": "site.standard.document",
  "description": "The porous polypropylene film roll of the present invention is a porous polypropylene film roll of which a porous polypropylene film comprising a polypropylene resin and having the average value of the porosities, µave, of 45 to 90% is wound around a core, and the unevenness of the thickness in the…",
  "path": "/patents/999435",
  "publishedAt": "2012-08-15T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "C08J5/18",
    "TORAY INDUSTRIES [JP]"
  ],
  "textContent": "The porous polypropylene film roll of the present invention is a porous polypropylene film roll of which a porous polypropylene film comprising a polypropylene resin and having the average value of the porosities, µave, of 45 to 90% is wound around a core, and the unevenness of the thickness in the film machine direction is not more than 15%. The porous polypropylene film roll of the present invention has not only excellent air permeability and porosity but also excellent thickness uniformity, and therefore a porous polypropylene film roll which can efficiently utilize the performance of an electric storage device and is suitable for a separator for an electric storage device is provided.",
  "title": "POROUS POLYPROPYLENE FILM ROLL"
}