JP2000248093A5 - - Google Patents
Download PDFInfo
- Publication number
- JP2000248093A5 JP2000248093A5 JP1999055461A JP5546199A JP2000248093A5 JP 2000248093 A5 JP2000248093 A5 JP 2000248093A5 JP 1999055461 A JP1999055461 A JP 1999055461A JP 5546199 A JP5546199 A JP 5546199A JP 2000248093 A5 JP2000248093 A5 JP 2000248093A5
- Authority
- JP
- Japan
- Prior art keywords
- molecular weight
- microporous
- polyolefin
- membrane
- average molecular
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 229920000098 polyolefin Polymers 0.000 description 29
- 239000012528 membrane Substances 0.000 description 22
- -1 polyethylene Polymers 0.000 description 5
- 239000004698 Polyethylene (PE) Substances 0.000 description 4
- 229920000573 polyethylene Polymers 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 229920001903 high density polyethylene Polymers 0.000 description 2
- 239000004700 high-density polyethylene Substances 0.000 description 2
- 229920001684 low density polyethylene Polymers 0.000 description 2
- 239000004702 low-density polyethylene Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000004707 linear low-density polyethylene Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
Description
【特許請求の範囲】
【請求項1】 重量平均分子量が50万以上の超高分子量ポリオレフィン(A)又は重量平均分子量50万以上の超高分子量ポリオレフィンを含む組成物(B)からなるポリオレフィン微多孔膜であって、空孔率が35〜95%、熱収縮率が3%を超えて15%以下、突刺強度が400〜650g/25μmであることを特徴とするポリオレフィン微多孔膜。
【請求項2】 融点(DSC測定により求められる)におけるシャットダウン時間が、10秒以下であることを特徴とする請求項1記載のポリオレフィン微多孔膜。
【請求項3】 熱収縮率がMD、TDともに5%〜15%であることを特徴とする請求項1又は2いずれかに記載のポリオレフィン微多孔膜。
【請求項4】 請求項1ないし3いずれかに記載のポリオレフィン微多孔膜を用いた電池セパレータ。
【請求項5】 請求項1ないし3いずれかに記載のポリオレフィン微多孔膜を電池セパレータとして用いた電池。
【請求項6】 請求項1ないし3いずれかに記載のポリオレフィン微多孔膜を用いたフィルター。
【請求項7】 重量平均分子量50万以上の超高分子量ポリオレフィン(A)又は重量平均分子量50万以上の超高分子量ポリオレフィンを含む組成物(B)5〜25重量%、溶剤95〜75重量%からなる溶液を、溶融押出しによりゲル状物を得、当該ゲル状物を3×3倍以上に延伸し、しかる後に溶剤を除去、乾燥後、95℃以上121℃以下にて熱セットを行うことを特徴とする請求項1ないし3いずれかに記載のポリオレフィン微多孔膜の製造方法。
[Claims]
1. A microporous polyolefin membrane comprising an ultrahigh molecular weight polyolefin (A) having a weight average molecular weight of 500,000 or more or a composition (B) containing an ultrahigh molecular weight polyolefin having a weight average molecular weight of 500,000 or more, A microporous polyolefin membrane having a porosity of 35 to 95%, a heat shrinkage of more than 3% to 15% or less, and a puncture strength of 400 to 650 g / 25 μm.
(2) The polyolefin microporous membrane according to claim 1, wherein a shutdown time at a melting point (determined by DSC measurement) is 10 seconds or less.
(3) 3. The microporous polyolefin membrane according to claim 1, wherein the heat shrinkage is 5% to 15% for both MD and TD. 4.
Claims4Claim 1Or one of threeA battery separator using the microporous polyolefin membrane of the above.
Claims5Claim 1Or one of threeA battery using the microporous polyolefin membrane according to the above as a battery separator.
Claims6Claim 1Or one of threeA filter using the microporous polyolefin membrane described in the above.
Claims7A solution comprising 5 to 25% by weight of an ultrahigh molecular weight polyolefin having a weight average molecular weight of 500,000 or more (A) or a composition containing an ultrahigh molecular weight polyolefin having a weight average molecular weight of 500,000 or more (B) and 95 to 75% by weight of a solvent. A gel-like material is obtained by melt extrusion, the gel-like material is stretched 3 × 3 times or more, then the solvent is removed, dried, and heat set at 95 ° C. or more and 121 ° C. or less. Claim 1Or one of threeThe method for producing a microporous polyolefin membrane according to the above.
本発明の好ましい態様を以下に示す。
(1)重量平均分子量50万以上の超高分子量ポリオレフィンが、ポリエチレンまたはポリプロピレンからなる前記ポリオレフィン微多孔膜。
(2)平均貫通孔径が0.01〜0.05μmであることを特徴とする請求項1、(1)記載のポリオレフィン微多孔膜。
(3)重量平均分子量50万以上の超高分子量ポリオレフィンを含む組成物(B)が、重量平均分子量100万以上の超高分子量ポリオレフィン(B−1)と、重量平均分子量10万以上100万未満の高密度ポリエチレン(B−2)とからなる前記ポリオレフィン微多孔膜。
(4)重量平均分子量50万以上の超高分子量ポリオレフィンを含む組成物(B)が、重量平均分子量100万以上の超高分子量ポリオレフィン(B−1)と、重量平均分子量10万以上100万未満の高密度ポリエチレン(B−2)、及びポリエチレン系シャットダウンポリマー(B−3)とからなり、(B−1)と(B−2)との合計の重量と、(B−3)との重量の比が70〜95/5〜30であり、かつ(B−3)が低密度ポリエチレン(LDPE)、線状低密度ポリエチレン(LLDPE)、分子量1000〜4000の低分子量ポリエチレン及びメタロセン触媒により得られたポリエチレン系重合体よりなる群より少なくとも一つ選ばれたポリマーからなることを特徴とする前記ポリオレフィン微多孔膜。
(5)融点(DSC測定により求められる)におけるシャットダウン時間が、10秒以下であることを特徴とする前記ポリオレフィン微多孔膜。
(6)熱収縮率がMD、TDともに5%〜15%であることを特徴とする前記ポリオレフィン微多孔膜。
(7)前記ポリオレフィン微多孔膜をセパレータとして用いた電池において、電極と前記セパレータとを80℃、10kg/cm2でプレスした時の剥離強度が、1g以上であることを特徴とする前記電池。
Preferred embodiments of the present invention are described below.
(1) The microporous polyolefin membrane described above, wherein the ultrahigh molecular weight polyolefin having a weight average molecular weight of 500,000 or more is made of polyethylene or polypropylene.
(2) The microporous polyolefin membrane according to (1), wherein the average through hole diameter is 0.01 to 0.05 μm.
(3) The composition (B) containing an ultrahigh molecular weight polyolefin having a weight average molecular weight of 500,000 or more is composed of an ultrahigh molecular weight polyolefin (B-1) having a weight average molecular weight of 1,000,000 or more and a weight average molecular weight of 100,000 or more and less than 1,000,000. The microporous polyolefin membrane comprising high-density polyethylene (B-2).
(4) The composition (B) containing an ultrahigh molecular weight polyolefin having a weight average molecular weight of 500,000 or more is composed of an ultrahigh molecular weight polyolefin (B-1) having a weight average molecular weight of 1,000,000 or more and a weight average molecular weight of 100,000 or more and less than 1,000,000. Of high-density polyethylene (B-2) and polyethylene-based shutdown polymer (B-3), and the total weight of (B-1) and (B-2) and the weight of (B-3) Is 70 to 95/5 to 30 and (B-3) is obtained by low density polyethylene (LDPE), linear low density polyethylene (LLDPE), low molecular weight polyethylene having a molecular weight of 1,000 to 4,000, and a metallocene catalyst. The microporous polyolefin membrane described above, wherein the microporous membrane comprises at least one polymer selected from the group consisting of polyethylene polymers.
(5) The microporous polyolefin membrane, wherein the shutdown time at the melting point (determined by DSC measurement) is 10 seconds or less.
(6) The microporous polyolefin membrane, wherein the heat shrinkage is 5% to 15% for both MD and TD.
(7) The battery using the microporous polyolefin membrane as a separator, wherein the electrode and the separator have a peel strength of 1 g or more when pressed at 80 ° C. and 10 kg / cm 2 .
(iii)突刺強度
本発明のポリオレフィン微多孔膜の突刺強度は、400〜650g/25μmである。突刺強度が400g/25μm未満では、ポリオレフィン微多孔膜を電池セパレータとして用いた場合には、電極凹凸やバリによって生ずるセパレータの圧迫によって破膜が起こりやすく、短絡が起こりやすい。650g/25μmを超えるとシャットダウンまでの時間が長くなり問題である。
(Iii) Puncture Strength The puncture strength of the microporous polyolefin membrane of the present invention is 400 to 650 g / 25 μm. When the puncture strength is less than 400 g / 25 μm, when the polyolefin microporous membrane is used as a battery separator, the separator is easily pressed by the unevenness of the electrode or the burr due to burrs, and the short circuit is likely to occur. If it exceeds 650 g / 25 μm , the time until shutdown becomes longer, which is a problem.
本発明のポリオレフィン微多孔膜は、上記の要件を満たし、収縮率と突刺強度のバランスがとれた微多孔膜であり、発熱した場合に、微孔を閉孔させ、シャットダウン機能を発揮する点に特徴があり電池用セパレータ、液体フィルター等として好適に用いることができる。
なお、本発明のポリオレフィン微多孔膜は、ポリオレフィン微多孔膜を電池セパレータとして用いるには、融点(DSC測定により求められる)におけるシャットダウン時間が、10秒以下であることが好ましい。さらに、電極とセパレータとを80℃、10kg/cm2でプレスしたときの剥離強度は1g以上が好ましく、より好ましくは5g以上である。この剥離強度が、1g未満であると、電極表面の凹凸に沿った表面変形によるセパレータの埋まり込みが十分発揮せず、いわゆるアンカー効果が弱くなり、電極との接着強度が低下するので好ましくない。剥離強度が5g以上になると、電極との接着性が良好となり、電極/セパレータ間に空隙が出来ずに電極の失活を招かず、また充放電に伴う電極変形にも追従しやすく、長期に渡って電極失活を防ぐ機能を有するので特に好ましい。
Microporous polyolefin membrane of the present invention satisfies the above requirements, a microporous membrane balanced shrinkage and puncture strength index, when heating, the microporous is closed porosity, that exerts shutdown functions And can be suitably used as a battery separator, a liquid filter and the like.
In the polyolefin microporous membrane of the present invention, in order to use the polyolefin microporous membrane as a battery separator, the shutdown time at the melting point (determined by DSC measurement) is preferably 10 seconds or less. Further, the peel strength when the electrode and the separator are pressed at 80 ° C. and 10 kg / cm 2 is preferably 1 g or more, more preferably 5 g or more. If the peel strength is less than 1 g, the separator is not sufficiently embedded due to surface deformation along irregularities on the electrode surface, so-called anchor effect is weakened, and the adhesive strength with the electrode is undesirably reduced. When the peel strength is 5 g or more, the adhesiveness with the electrode becomes good, a gap is not formed between the electrode and the separator, the electrode is not deactivated, and it is easy to follow the electrode deformation due to charge and discharge. It is particularly preferable because it has a function of preventing electrode deactivation over the entire area.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP05546199A JP4460668B2 (en) | 1999-03-03 | 1999-03-03 | Polyolefin microporous membrane and method for producing the same |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP05546199A JP4460668B2 (en) | 1999-03-03 | 1999-03-03 | Polyolefin microporous membrane and method for producing the same |
Publications (3)
Publication Number | Publication Date |
---|---|
JP2000248093A JP2000248093A (en) | 2000-09-12 |
JP2000248093A5 true JP2000248093A5 (en) | 2006-02-16 |
JP4460668B2 JP4460668B2 (en) | 2010-05-12 |
Family
ID=12999253
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP05546199A Expired - Lifetime JP4460668B2 (en) | 1999-03-03 | 1999-03-03 | Polyolefin microporous membrane and method for producing the same |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP4460668B2 (en) |
Families Citing this family (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6749961B1 (en) * | 2000-04-10 | 2004-06-15 | Celgard Inc. | Shutdown battery separator made with a blend of polymer and oligomer |
JP2002284918A (en) * | 2001-03-23 | 2002-10-03 | Tonen Chem Corp | Polyolefin microporous film, method for producing the same and use thereof |
CN100564433C (en) * | 2002-08-28 | 2009-12-02 | 旭化成电子材料株式会社 | Polyolefin microporous membrane and evaluation method thereof |
US7988895B2 (en) | 2005-09-28 | 2011-08-02 | Toray Tonen Specialty Separator Godo Kaisha | Production method of microporous polyethylene membrane and battery separator |
JP5202816B2 (en) * | 2006-04-07 | 2013-06-05 | 東レバッテリーセパレータフィルム株式会社 | Polyolefin microporous membrane and method for producing the same |
JP4902455B2 (en) * | 2006-08-01 | 2012-03-21 | 東レ東燃機能膜合同会社 | Polyolefin multilayer microporous membrane, method for producing the same, battery separator and battery |
JP5500765B2 (en) * | 2007-05-02 | 2014-05-21 | 三菱レイヨン株式会社 | Composite hollow fiber membrane for deaeration and method for producing the same |
WO2008149895A1 (en) * | 2007-06-06 | 2008-12-11 | Teijin Limited | Polyolefin microporous membrane base for nonaqueous secondary battery separator, method for producing the same, nonaqueous secondary battery separator and nonaqueous secondary battery |
JP5325405B2 (en) * | 2007-10-09 | 2013-10-23 | 旭化成イーマテリアルズ株式会社 | Polyolefin microporous membrane |
CN101747549B (en) * | 2008-12-18 | 2013-06-19 | 比亚迪股份有限公司 | Polyolefin micro porous polyolefin membrane and method for preparing same |
US9276244B2 (en) | 2012-02-08 | 2016-03-01 | Sumitomo Chemical Company, Limited | Method for producing polyolefin porous film, and laminated porous film |
JP5694971B2 (en) * | 2012-02-08 | 2015-04-01 | 住友化学株式会社 | Method for producing polyolefin microporous film and method for producing laminated porous film |
JP6095226B2 (en) * | 2013-12-06 | 2017-03-15 | 株式会社日本製鋼所 | Stretching method in film stretching machine and stretching apparatus for polyolefin microporous stretched film |
EP3181622B1 (en) | 2014-08-12 | 2020-12-30 | Toray Industries, Inc. | Polyolefin microporous membrane and method for manufacturing same, separator for nonaqueous-electrolyte secondary cell, and nonaqueous-electrolyte secondary cell |
JP6886839B2 (en) * | 2017-02-27 | 2021-06-16 | 旭化成株式会社 | Polyolefin microporous membrane |
CN110382605B (en) * | 2017-03-22 | 2022-06-17 | 东丽株式会社 | Polyolefin microporous membrane and battery using the same |
KR102199549B1 (en) * | 2018-03-28 | 2021-01-07 | 주식회사 엘지화학 | Evaluating method of stability of separator |
-
1999
- 1999-03-03 JP JP05546199A patent/JP4460668B2/en not_active Expired - Lifetime
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP2000248093A5 (en) | ||
Deimede et al. | Separators for lithium‐ion batteries: a review on the production processes and recent developments | |
JP5440171B2 (en) | Storage device separator | |
JP5690832B2 (en) | Multilayer porous film, separator for nonaqueous electrolyte secondary battery, and nonaqueous electrolyte secondary battery | |
JP5419817B2 (en) | Multilayer porous film, separator for nonaqueous electrolyte secondary battery, and nonaqueous electrolyte secondary battery | |
JP5267032B2 (en) | Porous film | |
WO2011062285A1 (en) | Laminated porous film, separator for battery, and battery | |
JP5697328B2 (en) | Multilayer porous film, battery separator, and battery | |
JP5732853B2 (en) | Porous film and power storage device | |
JP2015514812A (en) | Polyolefin composite microporous membrane excellent in heat resistance and stability and method for producing the same | |
JP5712629B2 (en) | Porous film and power storage device | |
JP2002544310A5 (en) | ||
JP6093636B2 (en) | Multilayer porous film, separator for nonaqueous electrolyte secondary battery, and nonaqueous electrolyte secondary battery | |
KR20060101541A (en) | Composite microporous film, and production method and use thereof | |
JP2008144039A (en) | Fluid-permeable fine porous material and its manufacturing method | |
CN108779282A (en) | Polyolefin micro porous polyolefin membrane and its manufacturing method, battery separator and battery | |
JP2004196871A5 (en) | ||
WO2017010480A1 (en) | Laminated porous film, separator for non-aqueous electrolyte secondary cell, non-aqueous electrolyte secondary cell, and production method for laminated porous film | |
JP2011184671A (en) | Heat resistant polyolefin microporous film and manufacturing method thereof | |
JP4884008B2 (en) | Polyethylene microporous membrane | |
JPWO2019065073A1 (en) | Polyolefin microporous membrane, battery separator and secondary battery | |
JP2002170540A (en) | Separator | |
JP2000248093A (en) | Microporous polyolefin membrane and its production | |
JP2018076475A (en) | High temperature low heat shrinkable polyolefin monolayer microporous film and method for producing the same | |
JP2019196470A (en) | Low heat shrinking polyolefin microporous film and its production method |