Sumitomo Electric Fine Polymer, Inc.

Sumitomo Electric Industries, Limited

Vascular Graft Research Center Co., Ltd.

Fumihiro Hayashi

Yasuhiro Okuda

Atsushi Uno

Yasuhiko Muroya

Yasuhito Masuda

Yoshimasa Suzuki

Takamasa Hashimoto

Aya Murata

Hiroyuki Tsujiwaki

Taro Fujita

Tsuyoshi Haga

Motomi Nakata

Shinichi Kanazawa

Hirokazu Katayama

Mayo Uenoyama

Yuichi Idomoto

Koichiro Natori

Atsushi Fukunaga

Yongrong Dong

Toshio Shigematsu

Kazuaki Ikeda

Kei Hanafusa

Tooru Morita

Shigetoshi Ikeda

Hajime Funatsu

Toshiaki Yagi

Toshiya Nishibe

Yutaka Okumura

Aya Oya

Akira Udagawa

Naoki Shimbara

Aya Ooya

Toshihiko Kumada

Itsumu Furumoto

Hidehiko Miura

The present disclosure relates to a micro or nano porous membrane composed of a stretched membrane of a fluororesin membrane, wherein the fluororesin membrane contains sintered bodies of a plurality of core-shell particles containing fluororesins, wherein the core-shell particles include cores and shells covering outer surfaces of the cores, wherein an average particle size of the core-shell particles before being sintered is greater than or equal to 100 nm and less than or equal to 1,000 nm, wherein a ratio of a volume of the shells to a volume of the cores in the core-shell particles before being sintered is greater than or equal to 2/98 and less than or equal to 50/50, wherein a fluororesin of the cores is a tetrafluoroethylene-hexafluoropropylene copolymer, a tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer or a combination thereof, and a fluororesin of the shells is polytetrafluoroethylene, and wherein a first heat of fusion of the fluororesins in the core-shell particles is less than or equal to 68 J/g.

Micro or nano porous membrane, manufacturing method of same, porous resin membrane complex, and filter element

A method for manufacturing a hollow fiber membrane module, the hollow fiber membrane module including: a hollow fiber membrane bundle including a plurality of hollow fiber membranes; a housing configured to contain the hollow fiber membrane bundle; and a potting part in which a potting agent is added between an outer surface of the hollow fiber membranes and an inner surface of the housing at both end regions or at one end region of the hollow fiber membrane bundle, wherein the method including: providing a sheet-shaped spacer in a space between the hollow fiber membranes at the both end regions or at the one end region of the hollow fiber membrane bundle; and adding a potting agent between the outer surface of the hollow fiber membranes and the inner surface of the housing at the both end regions or at the one end region of the hollow fiber membrane bundle such that the provided spacer is embedded, wherein the potting agent includes resin, rubber, or elastomer, as a main ingredient, and wherein the spacer is a net, a non-woven fabric, a porous sheet, or a film.

Method for manufacturing hollow fiber membrane module, and hollow fiber membrane module

A hollow-fiber membrane module according to an embodiment of the present disclosure includes a rectangular tubular outer casing with at least one sidewall being open, the outer casing having a plurality of open ports, and an inner casing configured such that a plurality of hollow-fiber membranes aligned in a longitudinal direction of the outer casing are placeable in the inner casing and configured to be insertable into the one sidewall.

Hollow-fiber membrane module

A hollow-fiber membrane according to an aspect of the present disclosure contains a polytetrafluoroethylene or a modified polytetrafluoroethylene as a main component and has an average outer diameter of 1 mm or less and an average inner diameter of 0.5 mm or less. In a measurement of a heat of fusion of the polytetrafluoroethylene or the modified polytetrafluoroethylene with a differential scanning calorimeter, when the polytetrafluoroethylene or modified polytetrafluoroethylene is subjected to a first step of heating from room temperature to 365&#xb0; C., a second step of cooling from 365&#xb0; C. to 350&#xb0; C., maintaining the temperature, subsequently cooling from 350&#xb0; C. to 330&#xb0; C., and further cooling from 330&#xb0; C. to 305&#xb0; C., and a third step of cooling from 305&#xb0; C. to 245&#xb0; C. at a rate of &#x2212;50&#xb0; C./min and subsequently heating from 245&#xb0; C. to 365&#xb0; C. at a rate of 10&#xb0; C./min, a heat of fusion from 296&#xb0; C. to 343&#xb0; C. in the third step is 30.0 J/g or more and 45.0 J/g or less.

Hollow-fiber membrane and hollow-fiber membrane module

A method of making an oil repellent sheet material according to an embodiment of the present disclosures includes a step of applying to a porous sheet a composition for forming an oil repellent layer, the composition containing a solvent and an amorphous fluorine resin dispersed therein, and a step of swaging the porous sheet after the step of applying, wherein the porous sheet has a fibrous skeleton composed mainly of polytetrafluoroethylene, the method of making an oil repellent sheet material further comprising a heat treatment step of heating the porous sheet to which the composition for forming an oil repellent layer is applied, before or after the step of swaging.

Method of making oil repellent sheet material and gas sensor

A semipermeable membrane according to an embodiment of the present invention includes a semipermeable membrane layer containing an amorphous resin as a main component, and a sheet-like supporting body that supports the semipermeable membrane layer. The supporting body has a porous first supporting layer and a porous second supporting layer laminated on one of surfaces of the first supporting layer. The second supporting layer has a smaller mean flow pore diameter than the first supporting layer. The second supporting layer is impregnated with the semipermeable membrane layer. A ratio of the mean flow pore diameter of the second supporting layer to the mean flow pore diameter of the first supporting layer is preferably 1/1,000 or more and &#x2155; or less. The mean flow pore diameter of the first supporting layer is preferably 0.05 &#x3bc;m or more and 20 &#x3bc;m or less, and the mean flow pore diameter of the second supporting layer is preferably 0.01 &#x3bc;m or more and 1 &#x3bc;m or less.

Semipermeable membrane and method for producing semipermeable membrane

A method for producing a laminated complex according to one embodiment of the present invention is a method for producing a laminated complex that includes a sheet-shaped or tube-shaped porous support and a semipermeable membrane layer stacked on an outer surface of the support, the method including a coating step of coating an outer surface of the support with a semipermeable membrane layer-forming composition in which a fluororesin is dispersed in a solvent; an immersing step of immersing the coated surface of the support in water after the coating step; and a heating step of heating water in which the support is immersed.

Method for producing laminated complex, and laminated complex

A porous filter includes a porous laminate in which a plurality of biaxially stretched porous sheets made of PTFE are stacked. The Gurley number G and the bubble point B (kPa) of the porous laminate satisfy the following expressions (1) and (2):log&#x3e;3.7&#xd7;10&#x2212;0.8&#x2003;&#x2003;(1)log&#x3c;4.9&#xd7;10+0.45&#x2003;&#x2003;(2).

Porous filter

A redox flow cell membrane includes a porous membrane that has a mean flow pore size of not more than 100 nm, that has a thickness of not more than 500 &#x3bc;m, and that has an air flow rate of not less than 0.1 ml/s&#xb7;cm. When the redox flow cell membrane is used for a V&#x2014;V-based redox flow cell, the porous membrane preferably has a mean flow pore size of not more than 30 nm.

Redox flow cell membrane

A porous polytetrafluoroethylene film comprising a fluororesin containing polytetrafluoroethylene as a main component, wherein an envelope surface area of resin fibers included per film having an area of 1 mand a thickness of 25 &#x3bc;m is 4,000 mor more, and a melting point peak is 333&#xb0; C. or lower.

Porous polytetrafluoroethylene film and method for producing same

A porous polytetrafluoroethylene composite includes a porous polytetrafluoroethylene film, a porous support layer that supports the porous polytetrafluoroethylene film, an adhesive layer bonded to the porous polytetrafluoroethylene film, and a porous reinforcement layer bonded to the adhesive layer, in which the adhesive layer is a layer composed of a fluororesin having a melting point, or a glass transition point when a melting point is not clearly defined, of lower than 260&#xb0; C.

Porous polytetrafluoroethylene composite and method for producing the same

Provided is a method for producing a porous polytetrafluoroethylene film having good chemical resistance, good heat resistance, a high porosity, and good dimensional stability. The method for producing a porous polytetrafluoroethylene film includes a stretching step of stretching a sheet-like molded body composed of a fluororesin containing polytetrafluoroethylene as a main component in a longitudinal direction and/or a lateral direction at a temperature lower than a melting point of the fluororesin to make a porous fluororesin film, and, after the stretching step, an annealing step of holding the porous fluororesin film in a shape-fixed state, and maintaining the porous fluororesin film at a temperature lower than the melting point of the fluororesin but not lower than a temperature 30&#xb0; C. lower than the melting point for 1 to 20 hours.

Method for producing porous polytetrafluoroethylene film and porous polytetrafluoroethylene film

There are provided a fluororesin thin film which is composed of a fluororesin, which has a thickness of 20 &#x3bc;m or less and a Gurley's number of 300 seconds or more, and which includes no defects, such as voids and/or cracks; a method for manufacturing the fluororesin thin film in which after a fluororesin dispersion including a dispersing medium and a fluororesin powder dispersed therein is applied on a flat and smooth foil, the dispersing medium is dried, and the fluororesin powder is sintered; the fluororesin dispersion; a fluororesin composite including a porous base material and the fluororesin thin film; a manufacturing method thereof, a porous fluororesin composite formed by stretching the fluororesin composite; and a separation membrane element using the porous fluororesin composite.

Manufacturing methods for a porous fluororesin composite

The invention offers a microporous modified-polytetrafluoroethylene membrane that is a microporous membrane having a significantly small pore diameter and narrow pore-diameter distribution and that can remove microscopic foreign particles at high efficiency when used as a filtration membrane. A microporous modified-polytetrafluoroethylene membrane that is a microporous membrane produced by the steps of producing a copolymer of hexafluoropropylene or perfluoroalkyl ether and tetrafluoroethylene having the number of moles not less than 50 times that of the hexafluoropropylene or perfluoroalkyl ether, forming the copolymer into the shape of a membrane, heating the membrane to the melting point of the copolymer or above to bake the copolymer, cooling the obtained baked product, and stretching the baked product and that has a mean flow pore diameter of 30 nm or less; a porous-modified-polytetrafluoroethylene-membrane composite that incorporates the microporous membrane and a production process of the composite; and a separation membrane element incorporating the porous-modified-polytetrafluoroethylene-membrane composite.

Microporous modified-polytetrafluoroethylene membrane, porous-modified-polytetrafluoroethylene-membrane composite and production process thereof, and separation membrane element

A tetrafluoroethylene resin molded article obtained by fusing PTFE by heating a tetrafluoroethylene resin by heating, and then executing a gradual cooling or a cooling including a holding at a temperature equal to or higher than 313&#xb0; C. and lower than 321&#xb0; C. for 10 minutes or longer, and having, when heated to 365&#xb0; C., then cooled to 245&#xb0; C. with a rate of &#x2212;1&#xb0; C./min, and then heated to 365&#xb0; C. with a rate of 10&#xb0; C./min, a heat of fusion which, within a range from 296 to 343&#xb0; C., is equal to or larger than 32 J/g and less than 47.8 J/g, a porous article obtained by expanding the molded article, and a composite article, a filter, an impact deformation absorber and a sealing material utilizing the molded article or the porous article.

Non-porous sinter molded article of tetrafluoroethylene resin, expanded tetrafluoroethylene resin molded article, producing methods therefor, composite member, filter, impact deformation absorber and sealing material

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Osaka, Japan

Fumihiro Hayashi