{
  "$type": "site.standard.document",
  "description": "An object of the invention is to provide vinylidene fluoride polymer powder exhibiting excellent solubility in aprotic polar solvents, and a vinylidene fluoride polymer solution obtained from the powder and an aprotic polar solvent. The inventive vinylidene fluoride polymer powder has an NMP…",
  "path": "/patents/998662",
  "publishedAt": "2012-09-05T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "C08F14/22",
    "KUREHA CORP [JP]"
  ],
  "textContent": "An object of the invention is to provide vinylidene fluoride polymer powder exhibiting excellent solubility in aprotic polar solvents, and a vinylidene fluoride polymer solution obtained from the powder and an aprotic polar solvent. The inventive vinylidene fluoride polymer powder has an NMP penetration rate of 12 to 100% as measured by an NMP penetration test. NMP penetration test: In a glass tube 8 mm in inner diameter which is packed with absorbent cotton at a lower portion, a lower sea sand layer is formed. 1 g of the vinylidene fluoride polymer powder is packed on the surface of this layer to form a vinylidene fluoride polymer powder layer. An upper sea sand layer is formed on the surface of this layer. Subsequently, 5 mL of NMP stained with methylene blue is poured onto the surface of the upper sea sand layer. After the passage of 3 minutes from the pouring, the depth of penetration of the NMP into the vinylidene fluoride polymer powder layer and the thickness of the vinylidene fluoride polymer powder layer are measured. The penetration depth is divided by the thickness of the vinylidene fluoride polymer powder layer and the quotient is multiplied by 100 to give an NMP penetration rate.",
  "title": "PROCESS FOR PRODUCING A VINYLIDENE FLUORIDE POLYMER POWDER"
}