{
  "$type": "site.standard.document",
  "description": "In order to provide a porous polypropylene film in which the ratio of change in air permeability is small and the initial air-permeating property is satisfactory even under high temperature environment, a porous polypropylene film is proposed, satisfying the following conditions (1) and (2)…",
  "path": "/patents/993658",
  "publishedAt": "2013-01-23T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B29C55/005",
    "MITSUBISHI PLASTICS INC [JP]"
  ],
  "textContent": "In order to provide a porous polypropylene film in which the ratio of change in air permeability is small and the initial air-permeating property is satisfactory even under high temperature environment, a porous polypropylene film is proposed, satisfying the following conditions (1) and (2) regarding air-permeability (Pa 1 ) at 20°C and air-permeability (Pa 2 ) after heating at 95°C for one hour: (1) The Pa 1 is 800 seconds/100 ml or less (2) The ratio of change in air permeability calculated by the formula below is 120% or less",
  "title": "POROUS POLYPROPYLENE FILM"
}