{
  "$type": "site.standard.document",
  "description": "The present invention provides a propylene-based resin microporous film which has excellent lithium ion permeability, can constitute a high-performance lithium ion battery, and can prevent a short circuit between a positive electrode and a negative electrode due to dendrites. [0002] The…",
  "path": "/patents/969131",
  "publishedAt": "2014-10-08T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B29C48/0018",
    "SEKISUI CHEMICAL CO LTD [JP]"
  ],
  "textContent": "The present invention provides a propylene-based resin microporous film which has excellent lithium ion permeability, can constitute a high-performance lithium ion battery, and can prevent a short circuit between a positive electrode and a negative electrode due to dendrites. [0002] The propylene-based resin microporous film of the present invention is a propylene-based resin microporous film containing micropores, wherein the degree of gas permeability is 100 to 400 s/100 mL, the standard deviation of the degree of gas permeability is 7 s/100 mL or less, the thermal shrinkage ratio during heating at 105°C for 2 hours is 6% or less, and the standard deviation of the thermal shrinkage ratio is 1% or less.",
  "title": "PROPYLENE RESIN MICROPOROUS FILM, SEPARATOR FOR BATTERY, BATTERY, AND METHOD FOR PRODUCING PROPYLENE RESIN MICROPOROUS FILM"
}