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Polymer Composition and Porous Membrane

a technology of porous membrane and polymer composition, which is applied in the direction of water/sewage treatment, osmosis/dialysis, electrical equipment, etc., can solve the problems that the fractionation performance of porous membrane cannot be said to be sufficient for ultrafiltration applications, and the cost-effectiveness of porous membrane cannot be said to be high, so as to achieve favorable fractionation performance and high water permeability

Inactive Publication Date: 2017-03-30
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0026]According to the invention, it is possible to obtain a polymer composition and a porous membrane suitable for obtaining a membrane exhibiting favorable fractionation performance and high water permeability by using a polymer easily obtained by a usual radical polymerization.
[0027]In addition, the polymer composition and the porous membrane of the invention exhibit the above performance, and thus the application thereof is not limited to the water treatment field but they are suitable for a support of an electrolyte solution, in particular, for a support that is swollen with a lithium ion electrolyte solution in a lithium ion battery.MODE(S) FOR CARRYING OUT THE INVENTION
[0029]A membrane forming polymer (A) may be contained in the polymer composition according to the first aspect of the invention and is one of the constituents of the porous membrane according to the second aspect of the invention.
[0030]The membrane forming polymer (A) is used for maintaining the structure of the polymer composition and the porous membrane of the invention, and the composition of the membrane forming polymer (A) can be selected according to the properties required to the polymer composition and the porous membrane.
[0031]In a case in which chemical resistance, oxidative deterioration resistance, and heat resistance are required, examples of the membrane forming polymer (A) may include a fluorine-containing polymer such as polyvinylidene fluoride (PVDF), PVDF-co-hexafluoropropylene (HFP), ethylene-co-chlorotrifluoroethylene (ECTFE), polyvinyl fluoride, or polytetrafluoroethylene (PTFE), polyvinyl chloride (PVC), polyethylene, polypropylene, polystyrene, a polystyrene derivative, a polyamide, a polyurethane, a polycarbonate, a polysulfone, a polyethersulfone, and cellulose acetate. Among these, a fluorine-containing polymer such as polyvinylidene fluoride (PVDF), PVDF-co-hexafluoropropylene (HFP), ethylene-co-chlorotrifluoroethylene (ECTFE), polyvinyl fluoride, or polytetrafluoroethylene (PTFE) is preferred from the viewpoint of chemical resistance and oxidative deterioration resistance of the polymer composition and the porous membrane. Among these, PVDF is preferred from the viewpoint of oxidative deterioration resistance and mechanical durability of the polymer composition and the porous membrane.
[0032]The membrane forming polymer (A) can be used singly or in combination of two or more kinds thereof.

Problems solved by technology

However, the porous membrane described in Patent Document 1 has a bubble point diameter of about from 122 to 198 nm and thus the fractionation performance thereof cannot be said to be sufficient for an ultrafiltration application.
In addition, the block copolymer used in Patent Document 1 is produced by a controlled radical polymerization method such as nitroxide-mediated polymerization (NMP), thus the monomer is required to be removed after the polymerization, and as a result, the porous membrane cannot be said to be cost-effective.

Method used

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  • Polymer Composition and Porous Membrane
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  • Polymer Composition and Porous Membrane

Examples

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examples

[0160]Hereinafter, the invention will be described in detail with reference to Examples. Incidentally, in the following, the composition and structure of the macromonomer (b1) and the polymer, the Mw of the polymer, the Mn and Mw / Mn of the macromonomer (b1) and the polymer were evaluated by the following methods.

[0161]In addition, in the following, the “parts” and the “%” indicate the “parts by mass” and the “% by mass”, respectively.

[0162](1) Composition and Structure of Macromonomer (b1) and Polymer

[0163]The composition and structure of the macromonomer (b1) and the polymer were analyzed by 1H-NMR (product name: JNM-EX270 manufactured by JEOL Ltd.).

[0164](2) Mw of Membrane Forming Polymer (A)

[0165]The Mw of the membrane forming polymer (A) was determined using a GPC (“HLC-8020” (trade name) manufactured by TOSOH CORPORATION) under the following conditions.

[0166]Column: TSK GUARD COLUMN a (7.8 mm×40 mm) and three TSK-GEL α-M (7.8×300 mm) are connected in series

[0167]Eluent: DMF 20 ...

synthesis example 2

(Synthesis Example 2) Synthesis of Dispersant 1

[0189]Into a reactor equipped with a stirrer, a cooling tube, and a thermometer, 61.6 parts of 17% aqueous solution of potassium hydroxide, 19.1 parts of methyl methacrylate (trade name: ACRYESTER M manufactured by Mitsubishi Rayon Co., Ltd.), and 19.3 parts of deionized water were introduced. Subsequently, the liquid in the reactor was stirred at room temperature, the exothermic peak thereof was confirmed, and then the liquid was further stirred for 4 hours. Thereafter, the reaction mixture in the reactor was cooled to room temperature, thereby obtaining an aqueous solution of potassium methacrylate.

[0190]Subsequently, 900 parts of deionized water, 70 parts of a 42% aqueous solution of sodium 2-sulfoethyl methacrylate (trade name: ACRYESTER SEM-Na manufactured by Mitsubishi Rayon Co., Ltd.), 16 parts of the above aqueous solution of potassium methacrylate, and 7 parts of methyl methacrylate (trade name: ACRYESTER M manufactured by Mits...

example 1

[0201]In a glass container, 16 parts of Kynar 761A (manufactured by Arkema Inc., PVDF homopolymer, trade names, Mw=550,000) as the membrane forming polymer (A), 12 parts of the polymer (B-1) as the polymer (B), and 72 parts of NMP (manufactured by Wako Pure Chemical Industries, Ltd., Wako special grade) as the solvent (C3) were blended and stirred for 10 hours at 50° C. using a stirrer, thereby preparing the membrane forming solution.

[0202]The membrane forming solution thus obtained was allowed to stand for one day at room temperature, subsequently coated on a glass substrate using a bar coater so as to have a thickness of 125 μm, thereby obtaining a coating film layered body. The coating film layered body was immersed in a coagulating bath containing 70 parts of deionized water and 30 parts of NMP as the coagulating bath solvent at room temperature.

[0203]The coating film layered body was allowed to stand in the coagulating bath for 5 minutes, and the coagulated product of coating f...

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Abstract

A polymer composition containing a polymer (B) obtained by polymerizing a monomer composition containing: a methacrylic acid ester macromonomer (b1) represented by the following formula (1); and another monomer (b2). Also, a porous membrane formed from a membrane forming polymer (A) and the aforementioned polymer composition.

Description

TECHNICAL FIELD[0001]The present invention relates to a polymer composition and a porous membrane.[0002]This application is based upon and claims the benefit of priority of the prior Japanese Patent Application No. 2012-278592, filed in the Japan Patent Office on Dec. 20, 2012, and the prior Japanese Patent Application No. 2013-029966, filed in the Japan Patent Office on Feb. 19, 2013, the entire contents of which are incorporated herein by reference.BACKGROUND ART[0003]Porous membranes are utilized in various fields such as a water treatment field including drinking water production, water purification treatment, and waste water treatment. In recent years, simplified manufacturing process is desired in addition to the membrane performance such as high fractionation performance or hydrophilicity.[0004]As a porous membrane, a polymer membrane containing a hydrophobic matrix polymer such as polyvinylidene fluoride and an amphiphilic block copolymer has been proposed in Patent Document...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B01D71/80B01D71/34B01D61/14B01D69/08C08J9/28H01M10/0525H01M2/16H01M10/0565C08L27/16C08J9/00B01D71/40C02F1/44H01M50/414
CPCB01D71/80C08J2201/0544B01D71/34B01D61/145B01D69/08C02F1/444H01M10/0525H01M2/1653H01M10/0565C08L27/16C08J9/0061C08J9/28B01D2323/02B01D2325/36H01M2300/0085C08J2327/16C08J2451/00C08J2205/042B01D71/40C08F290/04C08J5/18B01D61/14C09D127/16C08L55/00C08L101/00B01D71/32B01D69/02B01D2325/02Y02E60/10H01M50/414B01D2325/0283B01D71/401B01D71/4011C08L33/06B01D67/0006
Inventor HIKITA, SHINGONODA, TETSUYA
Owner MITSUBISHI CHEM CORP
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