{
  "$type": "site.standard.document",
  "coverImage": {
    "$type": "blob",
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  "description": "A microporous battery separator is provided having a first co extruded multilayered portion and a second co-extruded multilayered portion. The two portions are bonded together. In a preferred embodiment, the battery separator has two substantially identical multilayered portions bonded together…",
  "path": "/patents/1092945",
  "publishedAt": "2003-10-01T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B29C48/10",
    "CELGARD INC [US]"
  ],
  "textContent": "A microporous battery separator is provided having a first co extruded multilayered portion and a second co-extruded multilayered portion. The two portions are bonded together. In a preferred embodiment, the battery separator has two substantially identical multilayered portions bonded together face-to-face. Each of the two multilayered portions has at least one strength layer and at least one shutdown layer. Methods for making the battery separators are also provided. Preferably, a tubular multilayered film is extruded, and collapsed onto itself to form a multilayered battery separator precursor. The precursor is then bonded and annealed before it is stretched to form a microporous multilayer battery separator.",
  "title": "Multilayer battery separators"
}