JP3358339B2 - Hydrophilic membrane and its manufacturing method - Google Patents
Hydrophilic membrane and its manufacturing methodInfo
- Publication number
- JP3358339B2 JP3358339B2 JP28047194A JP28047194A JP3358339B2 JP 3358339 B2 JP3358339 B2 JP 3358339B2 JP 28047194 A JP28047194 A JP 28047194A JP 28047194 A JP28047194 A JP 28047194A JP 3358339 B2 JP3358339 B2 JP 3358339B2
- Authority
- JP
- Japan
- Prior art keywords
- fatty acid
- acid ester
- copolymer
- solvent
- alcohol
- 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.)
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- Separation Using Semi-Permeable Membranes (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、疎水性多孔質膜に、ビ
ニルアセタール単位と親水性モノマー単位とを含むビニ
ルアセタール系共重合体と添加成分との混合物を保持さ
せることによる親水化膜に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydrophilic membrane obtained by retaining a mixture of a vinyl acetal copolymer containing a vinyl acetal unit and a hydrophilic monomer unit and an additive component on a hydrophobic porous membrane. .
【０００２】[0002]
【従来の技術】ポリオレフィンに代表される疎水性多孔
質膜は、化学的安定性が高いことなどの利点を有し、水
または水溶液の分離精製、処理等の分野や医療分野で利
用されている。しかし、そのままでは水との親和性が乏
しいので、水または水溶液を処理する用途に用いる場合
には、予め親水化する必要がある。疎水性多孔質膜の親
水化処理のための方法としては、例えば、アルコール、
ケトン等の有機溶剤によって、疎水性多孔質膜の外表
面、微細孔内表面を湿潤処理した後、有機溶剤を水で置
換する方法がある。また、水可溶性親水性高分子や界面
活性剤等の親水化剤を疎水性多孔質膜表面に保持させる
ことによる親水化方法もある。2. Description of the Related Art Hydrophobic porous membranes represented by polyolefins have advantages such as high chemical stability and are used in fields such as separation and purification of water or aqueous solution, treatment, and medical fields. . However, if it is used as it is, it has a poor affinity for water, so that it needs to be hydrophilized in advance when used for treating water or an aqueous solution. As a method for hydrophilizing the hydrophobic porous membrane, for example, alcohol,
There is a method in which the outer surface of the hydrophobic porous membrane and the inner surface of the fine pores are wet-treated with an organic solvent such as ketone, and then the organic solvent is replaced with water. There is also a method of hydrophilization by retaining a hydrophilic agent such as a water-soluble hydrophilic polymer or a surfactant on the surface of the hydrophobic porous membrane.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、有機溶
剤による親水化方法は、疎水性多孔質膜を常に湿潤状態
に保持する必要があり、その維持管理が煩雑となってい
る。また、水可溶性親水性高分子による親水化方法は細
孔表面に保持させた親水化剤が水に溶けだし、そのよう
な状態の多孔質膜は一旦乾燥すると、親水性を失ってし
まうので、このような用途では好ましくない。界面活性
剤による親水化方法も水への溶出が懸念される他、雑菌
による資化を受けやすいといった問題がある。本発明は
これらの問題を解決することを目的とする。However, in the method for hydrophilizing with an organic solvent, it is necessary to keep the hydrophobic porous membrane in a wet state at all times, and the maintenance and management thereof are complicated. Also, in the method of hydrophilization using a water-soluble hydrophilic polymer, the hydrophilic agent held on the pore surface starts to dissolve in water, and the porous membrane in such a state loses hydrophilicity once dried, so Such a use is not preferable. The method of hydrophilizing with a surfactant also has a problem that it is liable to be eluted into water and is susceptible to assimilation by various bacteria. The present invention aims to solve these problems.
【０００４】[0004]
【課題を解決するための手段】本発明者らはこれらの問
題点を改良する方法として、親水性部分を有する高分子
であって、かつ膜成分樹脂に対して親和性があり、疎水
性多孔質膜に保持させた際の被処理水中への溶出が生じ
にくい化合物を、親水性−疎水性のバランスを考慮して
選定し、多孔質膜微細孔表面上に付着保持させる方法を
鋭意検討した結果、本発明を完成させるに至った。Means for Solving the Problems As a method for solving these problems, the present inventors have proposed a polymer having a hydrophilic portion, having an affinity for a membrane component resin, and a hydrophobic porous material. A compound that hardly dissolves into the water to be treated when retained on the porous membrane was selected in consideration of the balance between hydrophilicity and hydrophobicity, and a method for adhering and retaining the compound on the microporous surface of the porous membrane was studied. As a result, the present invention has been completed.
【０００５】本発明は、片面から他の面に連通している
微細孔を少なくとも一部に有する熱可塑性樹脂からなる
膜において、ビニルアセタール系共重合体と、その他の
一種類以上の添加成分との混合物を該微細孔を有する膜
の少なくとも一部に付着させて親水性を付与したことを
特徴とする親水化膜である。さらに、該熱可塑性樹脂が
疎水性熱可塑性樹脂のポリエチレン、ポリプロピレン、
ポリフロロエチレン、ポリアクリロニトリル、ポリエチ
レンテレフタレート、ポリスルホン、ポリアミド及びポ
リイミドから選ばれた少なくとも１種の物質または２種
以上の共重合体または２種以上の混合物であり、該ビニ
ルアセタール系共重合体のビニルアセタール環のアルキ
ル基の炭素数が１〜６であり、該ビニルアセタール系共
重合体が単独または２種以上の混合物を用い、特に、該
ビニルアセタール系共重合体のビニルアセタール環のア
ルキル基がメチル基、エチル基、ノルマルプロピル基、
イソプロピル基及びフェニル基である。本発明で用いる
ビニルアセタール系共重合体は、下記一般式で示され、[0005] The present invention relates to a film made of a thermoplastic resin having at least a part of micropores communicating from one surface to the other surface, wherein the vinyl acetal copolymer and one or more additional components are added. Is a hydrophilic film provided by imparting hydrophilicity by adhering a mixture of the above to at least a part of the film having micropores. Further, the thermoplastic resin is a hydrophobic thermoplastic resin polyethylene, polypropylene,
It is at least one kind of substance selected from polyfluoroethylene, polyacrylonitrile, polyethylene terephthalate, polysulfone, polyamide and polyimide, or two or more kinds of copolymers or a mixture of two or more kinds thereof, and the vinyl acetal copolymer vinyl The alkyl group of the acetal ring has 1 to 6 carbon atoms, and the vinyl acetal copolymer is used alone or in a mixture of two or more. Particularly, the vinyl group of the vinyl acetal copolymer has an alkyl group of a vinyl acetal ring. Methyl group, ethyl group, normal propyl group,
An isopropyl group and a phenyl group. The vinyl acetal copolymer used in the present invention is represented by the following general formula,
【０００６】[0006]
【化１】 Embedded image
【０００７】式中、Ｒ＝Ｃ1 〜Ｃ6 のアルキル基及びフ
ェニル基、好ましくはＣＨ3 、Ｃ2Ｈ5 、Ｃ3 Ｈ7 及び
Ｃ5 Ｈ6 であり、１＋ｍ＝１０〜７０モル％、ｎ＝３０
〜９０モル％が好ましい。親水性モノマー単位が３０モ
ル％未満では十分な親水性を付与できず、９０モル％を
越えると水溶性となり、使用できない。Wherein R = C 1 -C 6 alkyl and phenyl, preferably CH 3 , C 2 H 5 , C 3 H 7 and C 5 H 6 , 1 + m = 10-70 mol%, n = 30
~ 90 mol% is preferred. If the amount of the hydrophilic monomer unit is less than 30 mol%, sufficient hydrophilicity cannot be imparted. If the amount exceeds 90 mol%, the compound becomes water-soluble and cannot be used.
【０００８】本発明に用いる添加成分は、ショ糖脂肪酸
エステル、グリセリン脂肪酸エステル、ポリオキシエチ
レングリセリン脂肪酸エステル、ソルビタン脂肪酸エス
テル、ポリオキシエチレンソルビタン脂肪酸エステル、
プロピレングリコール脂肪酸エステル、ポリエチレング
リコール脂肪酸エステル、ポリプロピレングリコール脂
肪酸エステル、ポリオキシエチレン脂肪族アルコール、
及びポリオキシプロピレンポリオキシエチレンブロック
ポリマー等の非イオン性界面活性剤、あるいは、ポリア
ミド、ポリアクリル酸、エチルセルロース、ポリビニル
ピロリドン、ポリビニルアルコール、エチレン−ビニル
アルコール共重合体、ビニルピロリドン−酢酸ビニル共
重合体、マレイン酸樹脂、ポリビニルアセタールジエチ
ルアミノアセテート等の親水性高分子を挙げることがで
きる。本発明はポリビニルアセタール系共重合体の単独
コーティングで通水性能が十分に得られなかった場合に
有効な手段となる。[0008] The additional components used in the present invention include sucrose fatty acid ester, glycerin fatty acid ester, polyoxyethylene glycerin fatty acid ester, sorbitan fatty acid ester, polyoxyethylene sorbitan fatty acid ester,
Propylene glycol fatty acid ester, polyethylene glycol fatty acid ester, polypropylene glycol fatty acid ester, polyoxyethylene fatty alcohol,
And non-ionic surfactants such as polyoxypropylene polyoxyethylene block polymer, or polyamide, polyacrylic acid, ethyl cellulose, polyvinyl pyrrolidone, polyvinyl alcohol, ethylene-vinyl alcohol copolymer, vinyl pyrrolidone-vinyl acetate copolymer And hydrophilic polymers such as maleic acid resin and polyvinyl acetal diethylaminoacetate. The present invention is an effective means when sufficient water permeability cannot be obtained with a single coating of a polyvinyl acetal copolymer.
【０００９】本発明における疎水性多孔質膜としては、
中空糸膜、平膜、管状膜等の任意の形態を用いることが
できる。疎水性多孔質膜の素材は、ポリエチレン等前記
記載の単量体または共重合体である。The hydrophobic porous membrane in the present invention includes:
Arbitrary forms such as a hollow fiber membrane, a flat membrane, and a tubular membrane can be used. The material of the hydrophobic porous membrane is the above-described monomer or copolymer such as polyethylene.
【００１０】本発明の親水化方法は、ビニルアセタール
系共重合体と添加成分をアルコール系、アセトン系、芳
香族系等の溶媒の単独または混合溶媒、あるいはその含
水溶媒、好ましくは、メチルアルコール、エチルアルコ
ール、イソプロピルアルコールまたはアセトンの一種ま
たは二種以上の混合物、あるいはそれらの含水物に溶解
し、浸漬液を調製する。浸漬液の濃度は、ビニルアセタ
ール系共重合体と添加成分を合計した１〜５重量部を溶
媒１００容量部に溶解したものが好ましい。浸漬液が常
温で粘性が高い場合は、適宜加温して浸漬液の粘度を下
げて浸漬処理を行うことができる。次いで、疎水性多孔
質膜を浸漬し、膜の貫通微細孔内にも十分溶液を行き渡
らせた後、乾燥して溶媒を除去する。乾燥手段は、溶媒
の種類により風乾、減圧乾燥、加熱乾燥など通常の方法
を適宜用いることができる。また、ビニルアセタール系
共重合体と添加成分についての溶液をそれぞれ別々に調
製し、１種の溶液に浸漬するごとに疎水性多孔質膜を乾
燥し、次々に浸漬処理を行う多段浸漬処理を行ってもよ
い。溶媒種、及び浸漬の順序は適宜選んでよい。膜上の
親水化剤の量を示す担持率は次式で表され、本発明にお
ける親水化剤の担持率は５〜４０重量％が好ましい。 担持率（重量％）＝親水化剤量（ｇ）／疎水糸重量
（ｇ）×１００In the method for hydrophilization of the present invention, a vinyl acetal copolymer and an additive component may be used alone or in a mixed solvent of an alcohol-based, acetone-based, aromatic-based solvent or the like, or a water-containing solvent thereof, preferably methyl alcohol, It is dissolved in one or a mixture of two or more of ethyl alcohol, isopropyl alcohol and acetone, or a hydrate thereof to prepare an immersion liquid. The concentration of the immersion liquid is preferably a solution obtained by dissolving 1 to 5 parts by weight of the total of the vinyl acetal copolymer and the additional component in 100 parts by volume of the solvent. When the immersion liquid has a high viscosity at room temperature, the immersion treatment can be performed by appropriately heating to lower the viscosity of the immersion liquid. Next, the hydrophobic porous membrane is immersed, the solution is sufficiently spread even in the through-holes of the membrane, and then the solvent is removed by drying. As a drying means, an ordinary method such as air drying, reduced pressure drying, and heat drying can be appropriately used depending on the type of the solvent. In addition, a solution for the vinyl acetal copolymer and the solution for the additional component were separately prepared, and the hydrophobic porous membrane was dried each time it was immersed in one type of solution, and a multi-stage immersion treatment was performed in which immersion treatment was performed one after another. You may. The solvent type and the order of immersion may be appropriately selected. The loading rate indicating the amount of the hydrophilic agent on the membrane is represented by the following formula, and the loading rate of the hydrophilic agent in the present invention is preferably 5 to 40% by weight. Loading ratio (% by weight) = amount of hydrophilic agent (g) / weight of hydrophobic yarn (g) × 100
【００１１】[0011]
【実施例】以下に実施例及び比較例によって本発明を更
に詳細に説明する。The present invention will be described in more detail with reference to the following Examples and Comparative Examples.
【００１２】実施例１ ポリビニルブチラール〔商品名：エスレックＢＬ−１、
積水化学工業（株）製、親水性モノマー部３０モル％〕
１重量部とポリオキシエチレン（２０）グリセリンモノ
ステアレート〔商品名：リケマールＳ−１２０、理研ビ
タミン（株）製〕１重量部をアセトン１００容量部に溶
解し浸漬液とし、その中へポリプロピレン多孔質中空糸
膜〔宇部興産（株）製，平均孔径０．３μｍ，空孔率７
０％〕を３０秒間浸漬した。その後、風乾により溶剤の
除去を行い、担持率２５％の親水化膜を得た。この親水
化処理した中空糸膜を１００本束ねて末端をウレタン樹
脂で固め、有効面積１００ｃｍ2 の膜モジュールを作成
した。この膜モジュールに水圧１ｋｇ／ｃｍ2 をかけて
水を濾過したところ透水量は６０ｃｃ／ｍ2 ・ｍｉｎで
あり、優れた透水性を示した。また、水圧１ｋｇ／ｃｍ
2 で５リットルの水を濾過した後、完全に乾燥させた後
も透水性の低下はみられなかった。Example 1 Polyvinyl butyral [trade name: Eslec BL-1,
Sekisui Chemical Co., Ltd., hydrophilic monomer part 30 mol%]
1 part by weight and 1 part by weight of polyoxyethylene (20) glycerin monostearate (trade name: Riquemar S-120, manufactured by Riken Vitamin Co., Ltd.) are dissolved in 100 parts by volume of acetone to prepare an immersion liquid, into which polypropylene is porous. Hollow fiber membrane [Ube Industries, Ltd., average pore size 0.3 μm, porosity 7
0%] was immersed for 30 seconds. Thereafter, the solvent was removed by air drying to obtain a hydrophilic film having a loading rate of 25%. One hundred hollow fiber membranes subjected to the hydrophilic treatment were bundled and the ends were solidified with a urethane resin to prepare a membrane module having an effective area of 100 cm 2 . When water was filtered by applying a water pressure of 1 kg / cm 2 to the membrane module, the water permeability was 60 cc / m 2 · min, indicating excellent water permeability. In addition, water pressure 1kg / cm
After filtration of 5 liters of water in 2 and complete drying, no decrease in water permeability was observed.
【００１３】比較例１ ポリビニルブチラール〔商品名：エスレックＢＬ−１、
積水化学工業（株）製、親水性モノマー部３０モル％〕
１重量部をアセトン１００容量部に溶解した浸漬液を用
いた以外は実施例１と同様の操作をし、膜モジュールの
性能を評価したが、水は全く透過しなかった。Comparative Example 1 Polyvinyl butyral [trade name: Eslec BL-1,
Sekisui Chemical Co., Ltd., hydrophilic monomer part 30 mol%]
The same operation as in Example 1 was carried out except that an immersion solution obtained by dissolving 1 part by weight of acetone in 100 parts by volume of acetone was used to evaluate the performance of the membrane module. However, no water permeated.
【００１４】実施例２ ポリビニルブチラール〔商品名：エスレックＢＬ−１、
積水化学工業（株）製、親水性モノマー部３０モル％〕
１重量部をアセトン１００容量部に溶解したものを第１
浸漬液とし、その中へ実施例１で用いたのと同じポリプ
ロピレン中空糸膜を３０秒間浸漬した。その後、５分間
風乾し、８０℃の熱風を５分間あてた後、ポリオキシエ
チレン（２０）グリセリンモノステアレート〔商品名：
リケマールＳ−１２０、理研ビタミン（株）製〕１重量
部をアセトンに溶解した第２浸漬液中へ３０秒間浸漬し
た。その後、風乾し、実施例１と同様の膜モジュールに
よる透水性評価の結果、７５ｃｃ／ｍ2 ・ｍｉｎの透水
量を得た。Example 2 Polyvinyl butyral [trade name: Eslec BL-1,
Sekisui Chemical Co., Ltd., hydrophilic monomer part 30 mol%]
1 part by weight dissolved in 100 parts by volume of acetone
The same polypropylene hollow fiber membrane used in Example 1 was immersed in the immersion liquid for 30 seconds. Then, air-dry for 5 minutes and apply hot air of 80 ° C. for 5 minutes, and then polyoxyethylene (20) glycerin monostearate [trade name:
1 part by weight of Riquemar S-120, manufactured by Riken Vitamin Co., Ltd.] was immersed in a second immersion liquid dissolved in acetone for 30 seconds. Thereafter, it was air-dried, and as a result of a water permeability evaluation using the same membrane module as in Example 1, a water permeability of 75 cc / m 2 · min was obtained.
【００１５】比較例２ ポリビニルブチラール〔商品名：エスレックＢＬ−１、
積水化学工業（株）製、親水性モノマー部３０モル％〕
２重量部をアセトン１００容量部に溶解した浸漬液を用
いた以外は実施例１と同様の操作をし、膜モジュールの
性能を評価したが、水は全く透過しなかった。Comparative Example 2 Polyvinyl butyral [trade name: Eslec BL-1,
Sekisui Chemical Co., Ltd., hydrophilic monomer part 30 mol%]
The same operation as in Example 1 was carried out except that an immersion liquid in which 2 parts by weight of acetone was dissolved in 100 parts by volume of acetone was used, and the performance of the membrane module was evaluated.
【００１６】実施例３ ポリビニルアセタール系共重合体〔商品名：エスレック
ＫＸ−１、積水化学工業（株）製、親水性モノマー部７
８モル％〕２重量部とソルビタンモノラウレート〔商品
名：ＳＭＬ、第一工業製薬（株）製〕１重量部にエタノ
ール−水（８０：２０）混合液を加えて１００容量部と
した浸漬液を用いた以外は実施例１と同様の操作をし、
膜モジュールの性能を評価した結果、５５ｃｃ／ｍ2 ・
ｍｉｎの透水量を得た。Example 3 Polyvinyl acetal copolymer [trade name: Eslek KX-1, manufactured by Sekisui Chemical Co., Ltd., hydrophilic monomer part 7]
8 mol%] and 1 part by weight of sorbitan monolaurate (trade name: SML, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) were mixed with ethanol-water (80:20) to make 100 parts by volume. The same operation as in Example 1 was performed except that the liquid was used,
As a result of evaluating the performance of the membrane module, 55 cc / m 2 ·
min water permeability was obtained.
【００１７】比較例３ ポリビニルアセタール系共重合体〔商品名：エスレック
ＫＸ−１、積水化学工業（株）製、親水性モノマー部７
８モル％〕２重量部にエタノール−水（８０：２０）混
合液を加えて１００容量部に溶解した浸漬液を用いた以
外は実施例１と同様の操作をし、膜モジュールの性能を
評価したが、水は全く透過しなかった。Comparative Example 3 Polyvinyl acetal copolymer [trade name: Eslek KX-1, manufactured by Sekisui Chemical Co., Ltd., hydrophilic monomer part 7]
8 mol%] The same operation as in Example 1 was carried out except that an immersion liquid dissolved in 100 parts by volume of ethanol-water (80:20) was added to 2 parts by weight to evaluate the performance of the membrane module. However, no water was permeated.
【００１８】[0018]
【発明の効果】本発明の親水化ポリオレフィン多孔質膜
は濾過後に多孔質膜が乾燥されても透水性能の低下が認
められず、耐久性のある親水性が付与された多孔質膜で
ある。The porous polyolefin membrane of the present invention is a porous membrane having a durable hydrophilic property without a decrease in water permeability even when the porous membrane is dried after filtration.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭54−117380（ＪＰ，Ａ) 特開 昭48−36080（ＪＰ，Ａ) 特開 昭62−23403（ＪＰ，Ａ) 特開 昭62−201939（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) B01D 61/00 - 71/82 510 C02F 1/44 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-54-117380 (JP, A) JP-A-48-6080 (JP, A) JP-A-62-23403 (JP, A) JP-A-62 201939 (JP, A) (58) Field surveyed (Int. Cl. 7 , DB name) B01D 61/00-71/82 510 C02F 1/44
Claims (6)
少なくとも一部に有する熱可塑性樹脂からなる膜におい
て、ビニルアセタール系共重合体と、その他の１種類以
上の添加成分との混合物を該微細孔を有する膜の少なく
とも一部に付着保持させて親水性を付与したことを特徴
とする親水化膜。1. A film made of a thermoplastic resin having at least a part of micropores communicating from one surface to another surface, wherein a mixture of a vinyl acetal copolymer and at least one other additive component is provided. Is adhered and held on at least a part of the film having micropores to impart hydrophilicity.
ノマー単位３０〜９０モル％を含む水不溶性ビニルアセ
タール系共重合体であることを特徴とする請求項１記載
の親水化膜。2. The hydrophilic film according to claim 1, wherein the vinyl acetal copolymer is a water-insoluble vinyl acetal copolymer containing 30 to 90 mol% of a hydrophilic monomer unit.
セリン脂肪酸エステル、ポリオキシエチレングリセリン
脂肪酸エステル、ソルビタン脂肪酸エステル、ポリオキ
シエチレンソルビタン脂肪酸エステル、プロピレングリ
コール脂肪酸エステル、ポリエチレングリコール脂肪酸
エステル、ポリプロピレングリコール脂肪酸エステル、
ポリオキシエチレン脂肪族アルコール、及びポリオキシ
プロピレンポリオキシエチレンブロックポリマー等の非
イオン性界面活性剤、あるいは、ポリアミド、ポリアク
リル酸、エチルセルロース、ポリビニルピロリドン、ポ
リビニルアルコール、エチレン−ビニルアルコール共重
合体、ビニルピロリドン−酢酸ビニル共重合体、マレイ
ン酸樹脂及びポリビニルアセタールジエチルアミノアセ
テートよりなる群から選ばれた一種以上である請求項１
記載の親水化膜。3. The method according to claim 1, wherein the sucrose fatty acid ester, glycerin fatty acid ester, polyoxyethylene glycerin fatty acid ester, sorbitan fatty acid ester, polyoxyethylene sorbitan fatty acid ester, propylene glycol fatty acid ester, polyethylene glycol fatty acid ester, polypropylene glycol fatty acid ester,
Nonionic surfactants such as polyoxyethylene aliphatic alcohol and polyoxypropylene polyoxyethylene block polymer, or polyamide, polyacrylic acid, ethylcellulose, polyvinylpyrrolidone, polyvinyl alcohol, ethylene-vinyl alcohol copolymer, vinyl 2. The composition according to claim 1, which is at least one member selected from the group consisting of a pyrrolidone-vinyl acetate copolymer, a maleic acid resin, and polyvinyl acetal diethylaminoacetate.
The hydrophilized film according to the above.
ン、ポリプロピレン、ポリフロロエチレン、ポリアクリ
ロニトリル、ポリエチレンテレフタレート、ポリスルホ
ン、ポリアミド及びポリイミドから選ばれた少なくとも
１種の物質または２種以上の共重合体または２種以上の
混合物であることを特徴とする請求項１〜２記載のいず
れかの親水化膜。4. The thermoplastic resin is a hydrophobic resin such as polyethylene, polypropylene, polyfluoroethylene, polyacrylonitrile, polyethylene terephthalate, polysulfone, polyamide and polyimide. 3. The hydrophilized film according to claim 1, wherein the hydrophilized film is a mixture of two or more kinds.
１種類以上の添加成分をアルコール系、ケトン系、芳香
族系溶媒、またはそれらの混合溶媒、あるいはその含水
溶媒に溶解したものを浸漬液とし、片面から他の面に連
通している微細孔を少なくとも一部に有する熱可塑性樹
脂からなる膜を浸漬し、微細孔の少なくとも一部に該ビ
ニルアセタール系共重合体と添加成分を付着保持させる
ことを特徴とする親水化膜の製法。5. An immersion liquid obtained by dissolving a vinyl acetal copolymer and at least one other additive component in an alcohol-based, ketone-based, aromatic-based solvent, or a mixed solvent thereof, or a water-containing solvent thereof. Dipping a film made of a thermoplastic resin having at least a portion of micropores communicating from one surface to the other surface, and adhering and holding the vinyl acetal copolymer and the additional component to at least a portion of the micropores A method for producing a hydrophilized film, characterized in that:
ル系、ケトン系、芳香族系溶媒、またはそれらの混合溶
媒、あるいはその含水溶媒に溶解したものを第１浸漬液
として、片面から他の面に連通している微細孔を少なく
とも一部に有する熱可塑性樹脂からなる膜を浸漬し、引
き続いて、あるいは乾燥後、その他の添加成分をアルコ
ール系、ケトン系、芳香族系溶媒、またはそれらの混合
溶媒、あるいはその含水溶媒に溶解した第２浸漬液に浸
漬し、微細孔の少なくとも一部に該ビニルアセタール系
共重合体と添加成分を付着保持させることを特徴とする
親水化膜の製法。6. A first immersion liquid obtained by dissolving a vinyl acetal-based copolymer in an alcohol-based, ketone-based, aromatic-based solvent, or a mixed solvent thereof, or a water-containing solvent thereof, from one surface to another surface. Immerse a film made of a thermoplastic resin having at least a portion of communicating micropores, and subsequently or after drying, add other additives to an alcohol-based, ketone-based, aromatic-based solvent, or a mixed solvent thereof. Or a method for producing a hydrophilized film, characterized by immersing in a second immersion liquid dissolved in a water-containing solvent to adhere and hold the vinyl acetal copolymer and an additive component to at least a part of the fine pores.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28047194A JP3358339B2 (en) | 1994-11-15 | 1994-11-15 | Hydrophilic membrane and its manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28047194A JP3358339B2 (en) | 1994-11-15 | 1994-11-15 | Hydrophilic membrane and its manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08131794A JPH08131794A (en) | 1996-05-28 |
| JP3358339B2 true JP3358339B2 (en) | 2002-12-16 |
Family
ID=17625542
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28047194A Expired - Fee Related JP3358339B2 (en) | 1994-11-15 | 1994-11-15 | Hydrophilic membrane and its manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3358339B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9450187B2 (en) * | 2012-09-04 | 2016-09-20 | Merck Patent Gmbh | Process of surface modification of dielectric structures in organic electronic devices to increase surface energy |
-
1994
- 1994-11-15 JP JP28047194A patent/JP3358339B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08131794A (en) | 1996-05-28 |
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