发明授权
- 专利标题: Porous membrane of vinylidene fluoride resin and process for producing the same
- 专利标题(中): 偏氟乙烯树脂的多孔膜及其制造方法
-
申请号: US10548826申请日: 2004-03-10
-
公开(公告)号: US07351338B2公开(公告)日: 2008-04-01
- 发明人: Yasuhiro Tada , Takeo Takahashi , Toshiya Mizuno
- 申请人: Yasuhiro Tada , Takeo Takahashi , Toshiya Mizuno
- 申请人地址: JP Tokyo
- 专利权人: Kureha Corporation
- 当前专利权人: Kureha Corporation
- 当前专利权人地址: JP Tokyo
- 代理机构: Wenderoth, Lind & Ponack, L.L.P.
- 优先权: JP2003-068689 20030313; JP2003-112012 20030416
- 国际申请: PCT/JP2004/003074 WO 20040310
- 国际公布: WO2004/081109 WO 20040923
- 主分类号: B01D39/00
- IPC分类号: B01D39/00
摘要:
There is provided a porous membrane of vinylidene fluoride resin which has pores of appropriate size and distribution and also excellent mechanical strength represented by tensile strength and elongation at break and is useful as a microfiltration membrane or a separator for batteries. The porous membrane of vinylidene fluoride resin is characterized by the presence in mixture of a crystalline oriented portion and a crystalline non-oriented portion as confirmed by X-ray diffraction, and is produced by subjecting a melt-extruded composition obtained by mixing a vinylidene fluoride resin having a molecular weight distribution which is appropriately broad and high as a whole with a plasticizer and a good solvent for vinylidene fluoride resin, to cooling for solidification from one surface, extraction of the plasticizer and stretching.