JPS6253824A - Laminated porous film - Google Patents
Laminated porous filmInfo
- Publication number
- JPS6253824A JPS6253824A JP60193144A JP19314485A JPS6253824A JP S6253824 A JPS6253824 A JP S6253824A JP 60193144 A JP60193144 A JP 60193144A JP 19314485 A JP19314485 A JP 19314485A JP S6253824 A JPS6253824 A JP S6253824A
- Authority
- JP
- Japan
- Prior art keywords
- porous membrane
- laminated porous
- laminated
- membrane
- polyethylene
- 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
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、微細かつ均一な孔径を有し、ピンホールの全
くない積層多孔膜に関するものであり、該積層多孔膜は
人工肺用等の医療用隔膜、医薬食品用口過ＩＩ！２、電
池用隔膜等産業上の利用分野に使用される。Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a laminated porous membrane having fine and uniform pore diameters and no pinholes, and the laminated porous membrane is used for use in oxygenators, etc. Medical diaphragm, pharmaceutical and food diaphragm II! 2. Used in industrial fields such as battery diaphragms.
（従来技術とその問題点）
公知の多孔膜は一般に単層である。そしてこれらの単層
フィルムは、ミクロ相分離法、延伸法等いずれの製法で
製作されたものでも、ピンホール（粗大孔）を皆無にす
ることは困難である。(Prior art and its problems) Known porous membranes are generally single-layered. It is difficult to completely eliminate pinholes (coarse holes) in these single-layer films, regardless of whether they are produced by a microphase separation method, a stretching method, or the like.
ピンホールとは、多孔膜の孔径分布から、孔径の大きい
方にはずれた粗大孔をいう。例えば、平均孔径０．ｌμ
ｍ、最大有効孔径０．３ｕＬｍの多孔膜中の数ｇｍの粗
大な孔をいう。A pinhole is a coarse pore that deviates from the pore size distribution of a porous membrane toward the larger pore size. For example, the average pore size is 0. lμ
m, refers to coarse pores of several gm in a porous membrane with a maximum effective pore diameter of 0.3 uLm.
このようなピンホールを含む多孔膜は、口過用ミクロフ
ィルターとして用いた場合、数ｐｍまでの微粒子や細菌
類が透過してしまい、ミクロフィルターとしての＊ ｆ
＠を果さなくなる。When a porous membrane containing such pinholes is used as a microfilter for oral filtration, fine particles and bacteria up to a few pm will pass through it, making it difficult to use as a microfilter.
I won't be able to do @.
またポリオレフィン製多孔膜を人工肺用隔膜として用い
た場合、ポリオレフィンの撥水性及び微細孔の耐水圧に
より、血液は通さずにガスのみを通す、しかし数Ｊｉｍ
のピンホールが存在すると耐水圧が低いため、低圧で血
液漏れを生じ１人工肺としての機能を果さなくなる。In addition, when a polyolefin porous membrane is used as a diaphragm for an oxygenator, due to the water repellency of the polyolefin and the water pressure resistance of the micropores, only gas can pass through without blood.
If a pinhole exists, the water pressure resistance is low, and blood leaks at low pressure, making it impossible to function as an artificial lung.
ピンホールを防ぐには、Ｉ８！を検査して、ピンホール
の存在を見つけ、この部分を取り除くか、［１詰をする
必要がある。ピンホールを見つける方法としては、レー
ザー、光、高電圧等を用いた連続ピンホール検出機によ
る方法が一般的である。To prevent pinholes, I8! It is necessary to inspect and find the presence of a pinhole, and either remove this part or fill it. A common method for detecting pinholes is to use a continuous pinhole detector using laser, light, high voltage, or the like.
しかしながら、既存のピンホール検出機では、１０数７
ｔｍ以上のピンホールしか検出できず、数μｍさらには
１ｇｍ以下のピンホールを検出するり１は困難である。However, with existing pinhole detectors,
Only pinholes larger than tm can be detected, and it is difficult to detect pinholes smaller than several μm or even smaller than 1 gm.
一方、多孔膜を２枚貼り合わせた公知の膜としては、
■接着剤を部分的または、全面に塗７Ｉシ接看したもの
■ホットメルト剤を多孔膜間に分布させ、加熱ニップロ
ールで加熱接着したもの
■多孔膜を加熱したニップロールで加熱圧着したもの
等がある。しかしながら、■■の膜は、接着剤等の丑が
少なく部分的に接着している場合には、接着剤のついて
いない部分は多孔膜と多孔膜の間に隙間があり、この隙
間を通してピンホールがつながってしまう、また、接着
剤等を全面に塗布した膜は、接着剤等により多孔膜の孔
が塞がれることにより、膜の透過性は失われる。On the other hand, known membranes in which two porous membranes are bonded together include: 1) A film in which adhesive is applied partially or over the entire surface; 2) A hot-melt agent is distributed between the porous films and the film is heated and bonded with a heated nip roll. There are some types of porous membranes that are heat-pressed using heated nip rolls. However, if the membrane of ■■ is partially adhered with a small amount of adhesive, etc., there is a gap between the porous membranes in the part where the adhesive is not attached, and the pinhole can be inserted through this gap. In addition, if the entire surface of the membrane is coated with an adhesive or the like, the permeability of the membrane is lost due to the pores of the porous membrane being blocked by the adhesive or the like.
さらに接着剤やホットメルト剤が液体と接触した場合、
接着剤やホットメルト剤の成分の溶出もおきる。Additionally, if adhesives or hot melts come into contact with liquids,
Elution of components of adhesives and hot melt agents also occurs.
ｔ■の方法で作られた膜は、単に加熱、加圧しただけの
ものは、第２図に示したように多孔膜がほとんど接着し
ていないので、多孔膜の間の隙間を通してピンホールが
、実質上つながってしまっている。これを解決するため
に、樹脂の融点以上に温度を」二げたり、加圧を大きく
して作られた膜は、接着強度は向上するが、膜が融解し
たり、圧力でつぶれることにより、透過性能が著しく低
下する。If the membrane made by method t■ is simply heated and pressurized, as shown in Figure 2, the porous membranes are hardly adhered to each other, so pinholes cannot penetrate through the gaps between the porous membranes. , are virtually connected. To solve this problem, membranes made by raising the temperature above the melting point of the resin or increasing the pressure improve adhesive strength, but the membrane melts or collapses under pressure. Transmission performance is significantly reduced.
（発明の目的）
本発明は、従来の多孔膜が持つ以上のような問題点を解
消させ、ピンホールを皆無にした多孔膜を提供すること
を目的とする。(Objective of the Invention) An object of the present invention is to solve the above-mentioned problems of conventional porous membranes and to provide a porous membrane completely free of pinholes.
（発明の構成）
本発明の膜は、熱可塑性樹脂からなる多孔膜を２枚以上
績層融合した膜であって、積層多孔膜の表面を形成する
多孔膜の有効孔径分布の最大孔径よりも大きな孔径を有
する孔（ピンホール）が積層多孔膜の表面から裏面へ連
通していないことを特徴とする積層多孔膜である。(Structure of the Invention) The membrane of the present invention is a membrane in which two or more porous membranes made of thermoplastic resin are laminated and fused, and the membrane is larger than the maximum pore diameter of the effective pore size distribution of the porous membranes forming the surface of the laminated porous membrane. This is a laminated porous membrane characterized in that pores (pinholes) having large pore diameters do not communicate from the front surface to the back surface of the laminated porous membrane.
本発明に用いられる多孔膜とは構成要素としての膜であ
り、積層多孔膜とはこれらの多孔膜を２枚以上重ねて融
合一体化した膜である。The porous membrane used in the present invention is a membrane as a component, and the laminated porous membrane is a membrane in which two or more of these porous membranes are stacked and fused together.
本発明の積層多孔膜を構成する多孔膜の有効孔径分布と
は、多孔膜の平均孔径を中心に分布し。The effective pore size distribution of the porous membrane constituting the laminated porous membrane of the present invention is a distribution centered on the average pore size of the porous membrane.
多孔膜の機能を発現する孔径の分布であり、ピンホール
とはこの有効孔径分布の最大孔径よりも大きな孔径を有
する孔で、多孔膜の機７１を阻害するものである。積層
する多孔膜の数は、２枚以上であれば、２枚でも３枚で
も特に限定されない。A pinhole is a pore diameter distribution that exhibits the function of a porous membrane, and a pinhole is a pore having a pore diameter larger than the maximum pore diameter of this effective pore diameter distribution, which obstructs the function 71 of the porous membrane. The number of porous membranes to be laminated is not particularly limited, and may be two or three, as long as it is two or more.
本発明の積層多孔膜は、構成する多孔膜にピンホールが
存在する場合にも、ピンホールが表面から裏面へ積層多
孔膜中を連通ずることは皆無であり、ピンホールが全く
ない膜である。The laminated porous membrane of the present invention is a membrane without any pinholes, even if there are pinholes in the porous membranes that constitute it, the pinholes do not communicate from the front surface to the back surface in the laminated porous membrane. .
（実施ｆｉ様及び作用）
本発明における熱可塑性樹脂としては、ポリエチレン、
ポリプロピレン等のポリオレフィン系樹脂及びその共重
合体、ポリ弗化ビニリデン、エチレン−テトラフロロエ
チレン共重合体等の弗素系樹脂、ナイロン６、ナイロン
６６等のポリアミド樹脂、ポリエステル樹脂等の熱可塑
性樹脂であればいずれでも良い。(Implementation mode and effect) As the thermoplastic resin in the present invention, polyethylene,
Polyolefin resins such as polypropylene and their copolymers, fluorine resins such as polyvinylidene fluoride and ethylene-tetrafluoroethylene copolymers, polyamide resins such as nylon 6 and nylon 66, and thermoplastic resins such as polyester resins. Either is fine.
これら熱可塑性樹脂のうちポリオレフィン系樹脂が好ま
しい、さらには、ポリエチレン及びポリエチレンを主と
したポリエチレン共重合体が特に好ましい。Among these thermoplastic resins, polyolefin resins are preferred, and polyethylene and polyethylene copolymers mainly composed of polyethylene are particularly preferred.
２枚以上貼り合わせる熱可塑性樹脂の材質の組合せは、
例えば、ポリエチレンとポリプロピレンの組合せのよう
に、同系の組合せであれば使用できる。ポリエチレンと
ポリエチレンを主とした共重合体の組合せのように、同
種の組合せがより好ましく、ポリエチレンとポリエチレ
ンのように全く同一の材質であることが最も好ましい。The combination of thermoplastic resin materials that bond two or more sheets together is
For example, a combination of the same type can be used, such as a combination of polyethylene and polypropylene. A combination of the same kind, such as a combination of polyethylene and a copolymer mainly composed of polyethylene, is more preferable, and it is most preferable that the materials are exactly the same, such as polyethylene and polyethylene.
本発明に於ける多孔膜の平均孔径は０．０２〜５ｇｍで
あり、好ましくは０．０５〜５ｇｍの範囲にある。積層
多孔膜を構成する各多孔膜の平均孔径は異なっていても
良いが同じであるのがより々ｆましい。本発明に於ける
多孔膜の気孔率は３０〜９０％であり、好ましくは５０
〜８０％である。気孔率３０％未満では多孔膜としての
機能が低く好ましくない、また、気孔率が９０％を超え
ると、膜の強さが弱く好ましくない。The average pore diameter of the porous membrane in the present invention is in the range of 0.02 to 5 gm, preferably in the range of 0.05 to 5 gm. Although the average pore diameters of the porous membranes constituting the laminated porous membrane may be different, it is more preferable that they be the same. The porosity of the porous membrane in the present invention is 30 to 90%, preferably 50%.
~80%. If the porosity is less than 30%, the function as a porous membrane is low and undesirable, and if the porosity exceeds 90%, the strength of the membrane is undesirable.
積層多孔膜を構成する各多孔膜の気孔率は異なっていて
も良いが、同じであるのがより好ましい０本発明に於け
る多孔膜の厚さは５ｐｍ”１ｍｍである。本発明を構成
する各多孔膜の厚さは異なっていても良いが、同じであ
るのがより好ましい。The porosity of each porous membrane constituting the laminated porous membrane may be different, but it is more preferable that they be the same.The thickness of the porous membrane in the present invention is 5 pm" and 1 mm. Although the thickness of each porous membrane may be different, it is more preferable that the thickness be the same.
本発明の融合一体化の方法の例としては、時分１眉６０
−２３１３０号公報に開示された製法により、ポリエチ
レン、フタル酸ジオクチル及び微粉シリカを溶融成形し
た後、フタル酸ジオクチル、シリカを抽出して、ポリエ
チレン多孔膜を作り、この多孔膜を２枚重ね合わせ、ポ
リエチレンの融点以下７０℃〜融点以下１℃の温度に加
熱したロールで縦方向に１．２〜１５倍−軸延伸する方
法があるが、本発明の積層多孔膜はこれらの製法によっ
て限定されるものではない。As an example of the method of fusion and integration of the present invention, hour 1 eyebrow 60
According to the manufacturing method disclosed in Publication No. 23130, polyethylene, dioctyl phthalate and finely powdered silica are melt-molded, the dioctyl phthalate and silica are extracted, a polyethylene porous membrane is made, and two of these porous membranes are stacked together. There is a method in which the film is axially stretched 1.2 to 15 times in the longitudinal direction with rolls heated to a temperature of 70°C below the melting point of polyethylene to 1°C below the melting point, but the laminated porous membrane of the present invention is limited by these manufacturing methods. It's not a thing.
本発明の積層多孔膜の境界面は、第１図のように構成す
る２枚以上の多孔膜が融合一体化して。The boundary surface of the laminated porous membrane of the present invention is formed by fusion of two or more porous membranes configured as shown in FIG.
その境界面が観察されなくなり、実質上単層となってい
る。第２図は、加熱したニップロールで加熱圧着した公
知の積層膜で、２枚の多孔膜は融合しておらず単に重な
っているだけの状態であり、境界面が明瞭にあられれて
いる。Ｍ層多孔膜の層間剥離強度は、Ｉｇ／Ｃｍ巾以上
であり、好ましくは５ ｇ ／ ｃ ｍ ｌＪ以」−で
ある。The boundary surface is no longer observed, and it is essentially a single layer. FIG. 2 shows a known laminated film that was heat-pressed using heated nip rolls, and the two porous films are not fused but simply overlapped, and the boundary surface is clearly defined. The interlayer peel strength of the M-layer porous membrane is Ig/Cm width or more, preferably 5 g/cm lJ or more.
本発明による積層多孔膜は構成する多孔膜が元来備えて
いた透過性能を損なうことがなく融合一体化して、実質
的に単層となった膜であり、更にその際ピンホールが連
通ずる確率は皆無であるから、ピンホールを全く有しな
い多孔膜である。The laminated porous membrane according to the present invention is a membrane in which the constituent porous membranes are fused and integrated into a substantially single layer without impairing their original permeability. Since there are no pinholes, it is a porous film with no pinholes at all.
本発明による積層多孔膜がポリエチレンの場合には人工
肺用隔膜として使用することができる。When the laminated porous membrane according to the present invention is made of polyethylene, it can be used as a diaphragm for an oxygenator.
ポリエチレンは、血液に対して不活性で°あり、人工肺
用隔膜の材質として優れており、ポリエチレン多孔膜は
微細な孔構造とポリエチレンの臨界表面張力を利用して
、血液は通さずに、ガスのみを通すことができ、更にポ
リエチレン積層多孔膜はピンホールが皆無であるので、
血液漏れを生じることがなく、更に剥離強度が高い為長
時間使用しても′Ａ離を生じて、血液漏れを起こすこと
もない。従って本発明によるポリエチレン積層多孔膜は
、品性ず駐かつ高信頼性を有する人工肺用隔１漠を提供
することができる。Polyethylene is inert to blood and is an excellent material for diaphragms for oxygenators. Porous polyethylene membranes utilize the fine pore structure and critical surface tension of polyethylene to prevent blood from passing through, while allowing gas to pass through. Furthermore, the polyethylene laminated porous membrane has no pinholes, so
No blood leakage occurs, and since the peel strength is high, even if used for a long time, no separation occurs and no blood leakage occurs. Therefore, the polyethylene laminated porous membrane according to the present invention can provide an artificial lung septum having a high quality and high reliability.
また、本発明による積層多孔膜がポリオレフィン樹脂で
あれば、優れた耐薬品性の結果、アルカリ′１ヒ池やリ
チウム電池その他の各種−次電池、二次電池のセパレー
ターとして使用することができる。Further, if the laminated porous membrane according to the present invention is a polyolefin resin, it can be used as a separator for alkaline batteries, lithium batteries, and various other secondary batteries and secondary batteries due to its excellent chemical resistance.
本発明による積層多孔膜は構成する多孔膜の平均孔径が
０．０２〜５ｇｍであれば、高い口過精度と高い信頼性
が要求される医薬、食品用口過膜として使用することが
できる。また、本発明による積層多孔膜は、剥離強度が
ｌ ｇ ／ ｃ ｍ １１１以上であれば、屈曲、折曲
げ等の変形を加えても′ＡＳすることがなく、機械加工
性に優れ、かつ長時間使用しても剥離を生じることがな
いので、高信頼性を要求される工業用ミクロフィルター
として使用することができる。The laminated porous membrane according to the present invention can be used as a oral membrane for pharmaceuticals and foods, which requires high oral accuracy and high reliability, if the average pore diameter of the porous membrane is 0.02 to 5 gm. Furthermore, if the laminated porous membrane according to the present invention has a peel strength of l g/cm 111 or more, it will not undergo AS even when deformed by bending or bending, has excellent machinability, and can be used for long periods. Since it does not peel off even after being used for a long time, it can be used as an industrial microfilter that requires high reliability.
更に剥離強度が５ ｇ ／ ｃ ｍ ｒ口以上であれば
、連続して変形を加えても剥離することがなく、連続機
械加工性に優れ、工業的に有用である０本発明の効果を
明らかにするために実施例を示す、しかし本発明はこれ
らの実施例によって限定されるものではない。Furthermore, if the peel strength is 5 g/cmr or more, the material will not peel even if it is continuously deformed, has excellent continuous machinability, and is industrially useful. Examples are shown to illustrate the invention, but the present invention is not limited to these examples.
（実施例１）
特公昭６０−２３１３０号公報に開示される製法によっ
て、ポリエチレン、フタル酸ジオクチル及び微粉シリカ
を溶融成形した後、フタル酸ジオクチル、微粉シリカを
抽出して厚さ１００ ｐｍ。(Example 1) Polyethylene, dioctyl phthalate and finely powdered silica were melt-molded according to the manufacturing method disclosed in Japanese Patent Publication No. 60-23130, and then the dioctyl phthalate and finely divided silica were extracted to form a product with a thickness of 100 pm.
平均孔径０．１４ｍ、気孔率６８％の多孔Ｍ（融点１３
０℃）を作り、この多孔膜を２枚重ねて８０℃に予熱後
、ロール延伸機でロール温度１２０℃で縦方向に２倍延
伸すると同時に貼り合わせた。得られた積層多孔膜の剥
離強度は２０ ｇ ／ ｃｍ １１であった。Porous M with an average pore diameter of 0.14 m and a porosity of 68% (melting point 13
After preheating to 80°C, two sheets of this porous film were stacked and stretched twice in the longitudinal direction using a roll stretching machine at a roll temperature of 120°C, and simultaneously bonded together. The peel strength of the obtained laminated porous membrane was 20 g/cm11.
得られた積層多孔膜の透過性源は、１枚の多孔膜を同じ
条件で延伸した場合の多孔膜の性能とほぼ等しかった。The permeability source of the obtained laminated porous membrane was almost equal to the performance of a porous membrane when one porous membrane was stretched under the same conditions.
１枚で延伸した多孔膜にはピンホールが肉眼でも確認で
き、２枚の積層多孔膜の表面にも粗大孔が肉眼で確認で
きたが、積層多孔膜はＡｍ１ｃ。Pinholes were visible to the naked eye in the single stretched porous membrane, and coarse pores were visible to the naked eye on the surface of the two laminated porous membranes, but the laminated porous membrane was Am1c.
ｎ社製ＵＦセル（試験膜面積１６ｃｔｒｒ”）を用いた
水の漏れ試験を５０枚行なったが、漏れは全くなかった
。A water leak test was conducted on 50 sheets using a UF cell manufactured by Company N (test membrane area: 16 ctrr"), but there was no leakage at all.
（実施例２）
実施例１と同じ方法で得られた厚さ１１００ＪＬ、平均
孔径０．０５ＩＬｍ、気孔率２８％のポリエチレン多孔
膜を用いて実施例１と同じ方法で積層多孔膜を作った。(Example 2) A laminated porous membrane was produced in the same manner as in Example 1 using a polyethylene porous membrane having a thickness of 1100 JL, an average pore diameter of 0.05 ILm, and a porosity of 28%, obtained in the same manner as in Example 1.
得られた積層多孔膜の剥離強度は３０ ｇ ／ ｃ ｍ
巾であった。得られた８１層多孔膜の透過性能は１枚を
同じ条件で延伸して得られた積層多孔膜の性能とほぼ等
しかった。１枚で延伸して得られた多孔膜には、肉眼で
観察できる粗大孔は見られなかったが、実施例１と同じ
水の漏れ試験を行なったところ、５０枚の試験で８枚漏
れを生じた。これに対して積層多孔膜は５０枚の試験で
漏れは全くなかった。The peel strength of the obtained laminated porous membrane was 30 g/cm
It was wide. The permeation performance of the obtained 81-layer porous membrane was almost equal to that of a laminated porous membrane obtained by stretching one sheet under the same conditions. Although no macroscopic pores were observed in the porous membrane obtained by stretching one sheet, when the same water leakage test as in Example 1 was conducted, 8 sheets leaked out of the 50 sheets tested. occured. On the other hand, the laminated porous membrane showed no leakage at all in a test of 50 sheets.
（実施例３）
実施例１と同じ方法で得られた厚さ１１００ＩＬ、平均
孔径０．１μｍ、気孔率６８％のポリエチレン多孔膜を
３枚重ねて８０℃に予熱後、ロール延伸機でロール温度
１２０℃で縦方向に２倍延伸すると同時に貼り合わせた
。得られた積層多孔膜の各層間の剥離強度はそれぞれ２
０ ｇ ／ Ｃｍ １口であった。ピンホールは全くな
かった。(Example 3) Three polyethylene porous membranes with a thickness of 1100 IL, an average pore diameter of 0.1 μm, and a porosity of 68% obtained by the same method as in Example 1 were stacked and preheated to 80°C, and then the roll temperature was adjusted using a roll stretching machine. The film was stretched twice in the longitudinal direction at 120° C. and bonded together at the same time. The peel strength between each layer of the obtained laminated porous membrane was 2
It was 0 g/cm 1 mouth. There were no pinholes at all.
（実施例４）
実施例１と同じ方法で得られた厚さ１１００ＪＬ、平均
孔径０．１μｍ、気孔率６８％のポリエチレン多孔膜を
２枚重ねて６０℃に予熱後、ロール延伸機でロール温度
６０℃で縦方向に１．２倍延伸すると同時に貼り合わせ
た。得られた積層多孔ＩＶ２の剥離強度はＩｇ／ｃｍ巾
であったが、手でｋｉ】曲、折曲げ等の変形を加えても
Ｍ＃を生じなかった。(Example 4) Two polyethylene porous membranes with a thickness of 1100 JL, an average pore diameter of 0.1 μm, and a porosity of 68% obtained by the same method as in Example 1 were stacked and preheated to 60°C, and then the roll temperature was adjusted using a roll stretching machine. The film was stretched 1.2 times in the longitudinal direction at 60°C and bonded together. The peel strength of the obtained laminated porous IV2 was Ig/cm width, but M# did not occur even when deformed by hand, such as bending or bending.
第１図は本発明の積層多孔膜の境界面の結晶構造を示す
走査型電子顕微鏡写真である。（ａ）低倍率、（ｂ）拡
大図。
第２図は２枚の多孔膜を加熱したニップロールで加熱圧
着した公知の積層膜の境界面の結晶構造を示す走査型電
子顕微鏡写真である。（ａ）低倍率、（ｂ）拡大図。FIG. 1 is a scanning electron micrograph showing the crystal structure of the interface of the laminated porous membrane of the present invention. (a) Low magnification, (b) enlarged view. FIG. 2 is a scanning electron micrograph showing the crystal structure of the boundary surface of a known laminated film in which two porous films are heat-pressed by heated nip rolls. (a) Low magnification, (b) enlarged view.
Claims (6)
積層多孔膜であって、表面を形成する多孔膜の有効孔径
分布の最大孔径よりも大きな孔径を有する孔（ピンホー
ル）が、積層多孔膜の表面から裏面へ連通していないこ
とを特徴とする積層多孔膜。(1) A laminated porous membrane in which two or more thermoplastic resin porous membranes are laminated and fused, and the pores (pinholes) have a larger pore diameter than the maximum pore diameter of the effective pore size distribution of the porous membrane forming the surface. A laminated porous membrane characterized in that there is no communication from the front surface to the back surface of the laminated porous membrane.
請求の範囲第１項記載の積層多孔膜。(2) The laminated porous membrane according to claim 1, wherein the thermoplastic resin is a polyolefin resin.
重合体である特許請求の範囲第２項記載の積層多孔膜。(3) The laminated porous membrane according to claim 2, wherein the polyolefin resin is polyethylene or a copolymer thereof.
ある特許請求の範囲第１項記載の積層多孔膜。(4) The laminated porous membrane according to claim 1, wherein the laminated porous membrane has an interlayer peel strength of 1 g/cm width or more.
２〜５μｍ、気孔率が３０〜９０％である特許請求の範
囲第１項記載の積層多孔膜。(5) The average pore diameter of the porous membrane constituting the laminated porous membrane is 0.0
The laminated porous membrane according to claim 1, which has a porosity of 2 to 5 μm and a porosity of 30 to 90%.
ｍｍである特許請求の範囲第１項記載の積層多孔膜。(6) The thickness of the porous membrane constituting the laminated porous membrane is 5 μm to 1
The laminated porous membrane according to claim 1, which is mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60193144A JPS6253824A (en) | 1985-09-03 | 1985-09-03 | Laminated porous film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60193144A JPS6253824A (en) | 1985-09-03 | 1985-09-03 | Laminated porous film |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6253824A true JPS6253824A (en) | 1987-03-09 |
| JPH044944B2 JPH044944B2 (en) | 1992-01-29 |
Family
ID=16303014
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60193144A Granted JPS6253824A (en) | 1985-09-03 | 1985-09-03 | Laminated porous film |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6253824A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0277108A (en) * | 1987-07-04 | 1990-03-16 | Toray Ind Inc | Electrolyte separator |
| US5627457A (en) * | 1993-07-21 | 1997-05-06 | Seiko Epson Corporation | Power supply device, liquid crystal display device, and method of supplying power |
| JP2001087632A (en) * | 1999-09-21 | 2001-04-03 | Asahi Kasei Corp | Method for preparing hollow fibrous porous film |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5017474A (en) * | 1973-06-16 | 1975-02-24 | ||
| JPS5751450A (en) * | 1980-09-13 | 1982-03-26 | Junkosha Co Ltd | Baked drawn porous tetrafluoroethylene resin laminate and its manufacture |
| JPS5878369A (en) * | 1981-10-08 | 1983-05-11 | エナジ−・リサ−チ・コ−ポレ−シヨン | Electrochemical battery and electrochemical device |
-
1985
- 1985-09-03 JP JP60193144A patent/JPS6253824A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5017474A (en) * | 1973-06-16 | 1975-02-24 | ||
| JPS5751450A (en) * | 1980-09-13 | 1982-03-26 | Junkosha Co Ltd | Baked drawn porous tetrafluoroethylene resin laminate and its manufacture |
| JPS5878369A (en) * | 1981-10-08 | 1983-05-11 | エナジ−・リサ−チ・コ−ポレ−シヨン | Electrochemical battery and electrochemical device |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0277108A (en) * | 1987-07-04 | 1990-03-16 | Toray Ind Inc | Electrolyte separator |
| US5627457A (en) * | 1993-07-21 | 1997-05-06 | Seiko Epson Corporation | Power supply device, liquid crystal display device, and method of supplying power |
| JP2001087632A (en) * | 1999-09-21 | 2001-04-03 | Asahi Kasei Corp | Method for preparing hollow fibrous porous film |
| JP4605840B2 (en) * | 1999-09-21 | 2011-01-05 | 旭化成ケミカルズ株式会社 | Method for forming hollow fiber porous membrane |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH044944B2 (en) | 1992-01-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5565281A (en) | Shutdown, bilayer battery separator | |
| US7851043B2 (en) | Laminates of asymmetric membranes | |
| JP6149052B2 (en) | Microporous membrane, battery separator and method for producing the same | |
| JP3003500B2 (en) | Polytetrafluoroethylene composite porous membrane | |
| JP3960437B2 (en) | Closed three-layer battery separator | |
| TW305890B (en) | Supported membrane assembly | |
| JPH07507237A (en) | supported microporous membrane | |
| JPH06500499A (en) | smoke filter | |
| EP1409118B1 (en) | Method of making a laminated edge filter structure | |
| JPS60238103A (en) | Support of separation membrane | |
| JP5207569B2 (en) | Lithium battery separator | |
| JPS6253824A (en) | Laminated porous film | |
| JP5097326B2 (en) | Asymmetric membrane stack | |
| JPH0365776B2 (en) | ||
| US6921608B2 (en) | Battery separator | |
| JPH02269034A (en) | Sterile, hydrophobic polytetrafluoroethylene membrane laminate | |
| JP2942867B2 (en) | Multilayer composite membrane | |
| JPS60257820A (en) | Gas separation composite membrane | |
| JPH0687140B2 (en) | Method for manufacturing roll-shaped photosensitive material package | |
| JPH0899008A (en) | Electret filter | |
| KR100371390B1 (en) | Separator having multi-layer structure | |
| JPH0329150Y2 (en) | ||
| JPS6360742A (en) | Manufacture of laminated article | |
| JPS6117658B2 (en) | ||
| JPS63274433A (en) | Preparation of oxygen enriching multilayer composite hollow yarn membrane |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |