[특허]Microporous membrane and method for forming

Microporous membrane and method for forming 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	B01D-053/22
출원번호	US-0129145 (2009-10-22)
등록번호	US-8540801 (2013-09-24)
국제출원번호	PCT/US2009/061572 (2009-10-22)
§371/§102 date	20110513 (20110513)
국제공개번호	WO2010/059327 (2010-05-27)
발명자 / 주소	Romdhane, Ilyess H. Mezhirov, Mikhail S.
출원인 / 주소	3M Innovative Properties Company
대리인 / 주소	Baker, James A.
인용정보	피인용 횟수 : 0 인용 특허 : 20

초록

The present disclosure describes a method for forming microporous membranes. More specifically, vapor induced phase separation techniques are used for forming multizone microporous membranes having improved material throughput.

대표청구항 ▼

1. A method for forming a microporous membrane comprising: casting a plurality of dope formulations on a support to provide a multilayer sheet having a first major surface;exposing the multilayer sheet to a first relative humidity level such that water vapor diffuses into the first major surface;exposing the multilayer sheet to a second relative humidity level such that additional water vapor diffuses into the multilayer sheet effecting a phase separation to provide the microporous membrane, wherein the second relative humidity level is greater than the first relative humidity level;washing the microporous membrane; anddrying the microporous membrane. 2. The method of claim 1, wherein casting a plurality of dope formulations comprises casting a first dope formulation and a second dope formulation to provide the multilayer sheet. 3. The method of claim 2, wherein the first dope formulation is the same formulation as the second dope formulation. 4. The method of claim 1, further comprising formulating the plurality of dope formulations, each of the plurality of dope formulations comprising a polymeric material, an adjuvant and a solvent. 5. The method of claim 4, wherein the polymeric material in each of the plurality of dope formulations is selected from the group consisting of polyethersulfones, polyetherimides, nylons, polyimides, polyamides, polysulfones, polyarylsulphones, polyvinyl chloride, polyalkylene terephthalates, polycarbonates, polyolefins, cellulosics, polystyrenes, acrylic polymers, methacrylic polymers, copolymers of acrylic or methacrylic polymers, and combinations thereof. 6. The method of claim 4, wherein the adjuvant comprises a poly(alkylene glycol), a polyether, or combinations thereof. 7. The method of claim 6, wherein the poly(alkylene glycol) is poly(ethylene glycol). 8. The method of claim 4, wherein a concentration of the adjuvant of the first dope formulation and the second dope formulation independently is in a range from about 60 to about 70 weight percent based on the total weight of the dope formulation. 9. The method of claim 4, wherein a concentration of polymeric material of the second dope formulation is greater than a concentration of polymeric material of the first dope formulation. 10. The method of claim 4, wherein the concentration of polymeric material of the first dope formulation and the second dope formulation independently is in a range from about 5 to about 15 weight percent based on the total weight of the dope formulation. 11. The method of claim 1, wherein the second relative humidity level is at least 5 percent greater than the first relative humidity level. 12. The method of claim 11, wherein the first relative humidity level is in a range from about 45 to about 55 percent and the second relative humidity level is in a range from about 60 to about 80 percent. 13. The method of claim 1, wherein exposing the multilayer sheet further comprises exposing the multilayer sheet to an intermediate humidity level. 14. The method of claim 13, wherein the intermediate humidity level is intermediate to the first relative humidity level and to the second relative humidity level.

이 특허에 인용된 특허 (20)

Malon Raymond F. (St. Charles MO) Cruse Clint A. (St. John MO), Asymmetric gas separation membranes having improved strength.
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Wrasidlo Wolfgang J. (La Jolla CA), Asymmetric membranes.
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Dennison Kathleen A. (Grant Township ; Washington County MN), Azlactone functional particles incorporated in a membrane formed by solvent phase inversion.
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Dennison Kathleen A. (Grant Township ; Washington County MN) La Londe Monserrat R. (Stillwater MN) Stefely James S. (Woodbury MN), Azlactone-functional membranes and methods of preparing and using same.
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Wrasidlo Wolfgang J. (La Jolla CA), Dispersing casting of integral skinned highly asymmetric polymer membranes.
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Ophir, Amos; Cohen, Eyal; Dishon, David; Colman, Joshua Lewis, Drying substances, preparation and use thereof.
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Clough Thomas J. (Santa Monica CA) Grosvenor Victor L. (Topanga CA) Pinsky Naum (Thousand Oaks CA), Gas separation process.
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Wang I-fan, Highly asymmetric polyethersulfone filtration membranes.
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Calis, Gijsbertus Hendrikus Maria; Steenbakkers, Edwin Henricus Adriaan; Osenar, Paul; Formato, Richard M.; Sabin, Paul; Avis, Seth, Humidifier membrane.
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Ji, Jiang; Dicecca, Candeloro; Mehta, Mahesh J., Hydrophilic hollow fiber ultrafiltration membranes that include a hydrophobic polymer and a method of making these membranes.
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Oyama, S. Ted; Gu, Yungeng, Hydrothermally-stable silica-based composite membranes for hydrogen separation.
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Hughes, Shannon Kay; Kody, Robert Steven; Mrozinski, James Stephen; Brostrom, Myles Lee, Microporous materials and methods of making the same.
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David, Moses Mekala; Lakshmi, Brinda Balasubramaniam, Plasma treatment of porous materials.
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David,Moses Mekala; Lakshmi,Brinda Balasubramaniam, Plasma treatment of porous materials.
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Sale, Richard; Ostreicher, Eugene, Pre-metered, unsupported multilayer microporous membrane.
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Sale,Richard; Ostreicher,Eugene, Pre-metered, unsupported multilayer microporous membrane.
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Pall David B. (Roslyn Estates NY) Model Frank (Dix Hills NY), Process for preparing liquophilic polyamide membrane filter media and product.
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Meldrum Ian G. (Leatherhead GB2) Naylor Timothy d. (Woking GB2), Separation of water from organic fluids.
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Mark T. Meyering ; William R. Kelly ; Jack H. Vining ; C. Thomas Baddenhop ; Joseph G. Wallace, System for manufacturing reinforced three-zone microporous membrane.
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Baker Richard W. (Palo Alto CA) Louie Jenny (Fremont CA) Pfromm Peter H. (Palo Alto CA) Wijmans Johannes G. (Menlo Park CA), Ultrathin composite metal membranes.
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A	생활필수품
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A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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Microporous membrane and method for forming 원문보기

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