Asahi Kasei Kogyo Kabushiki Kaisha

Morishita Pharm.

Kazuo Toyomoto

Jyoji Ibata

Kazuhiro Suzuoki

Hidehiko Kobayashi

Kaoru Ohmura

Yoshio Hayashi

Hiroshi Komoto

Masakazu Kurihara

Hiroshi Kobayashi

Nobuatsu Watanabe

Fusakazu Hayano

Takayuki Yokoyama

Noboru Kubota

Tsuneo Hoki

Yasuo Hashino

Sumitaka Nogami

Katsuyuki Nakamura

Kiichiro Sasaguri

Takehiko Otoyo

Einosuke Fujimoto

Yoshio Matsumoto

Keiichi Waki

Tooru Okada

Mikio Sato

Kenji Ito

Saburo Minekawa

Shunji Matsuo

Koretaka Yamaguchi

Shikazo Senoh

Takashi Ogawa

Eigo Terada

Izumi Fujita

Yoshiaki Kageura

Norikatu Nakayama

Shougi Misawa

Chikako Nagano

Masayuki Nanpo

Hideo Sekiguchi

Yashio Hayashi

Shoichi Doi

Bunzo Uda

A method for simultaneously removing a plurality of different heavy metal ions from contaminated water is disclosed. A plurality of different heavy metal ions can be simultaneously, efficiently removed by filtering contaminated water through a porous membrane comprising a membranous, porous resin matrix and a plurality of side chains chemically bound to both surfaces and pore wall surfaces of the matrix, which side chains each have a chelate group, preferably an iminodiacetic acid group, and terminating the filtration when the concentration of a determinant heavy metal ion in the filtrate reaches a predetermined level. By the method of the present invention, a plurality of different heavy metal ions, such as a cobalt ion and a nickel ion, can be simultaneously, efficiently removed from contaminated water, such as water to be used for and waste water from a nuclear power generator, on a commercial scale.

Method for removing heavy metal ions from contaminated water and a

A selectively ion-adsorptive, porous membrane comprising a membranous, porous resin matrix of a hydrophobic polyolefin or a hydrophobic copolymer of an olefin and a halogenated olefin and a plurality of side chains chemically bonded to both surfaces, which in turn are inclusive of pore wall surfaces, of the membranous porous resin matrix is disclosed. The side chains collectively contain both neutral hydroxyl groups and ion exchange groups. The selectively ion-adsorptive, porous membrane is suitable for use in selective purification or selective removal of desired ionic substances including not only ionic inorganic substances but also an ionic organic substances, such as a protein and an amino acid, on a commercial scale. Further, the selectively ion-adsorptive, porous membrane has not only excellent heat resistance, but also excellent mechanical strength. Therefore, the porous membrane of the present invention can advantageously be used for industrial applications, such as pharmacy, fermentation and the like.

Selectively ion-adsorptive, porous membrane having side chains

A permeable polymer membrane, formed of a fluorine type copolymer containing a repeating unit represented by the general formula: ##STR1## wherein m is 0 or 1 and n is an integer of the value of 2 to 5 and satisfying the relation between the water absorption ratio, W, and the ion-exchange capacity, Q, represented by the following formula:

Permeable polymer membrane for dessication of gas

There is disclosed a hollow fiber semipermeable membrane element comprising hollow fiber semipermeable membranes having their respective one end portions or both end portions bonded together by means of a vulcanized rubber, so that the semipermeable membrane element has a high resistance to chemicals. The incorporation of a graphite fluoride in the rubber serves to further increase not only the hardness of the bonding rubber portions but also the resistance of the bonding rubber portions to chemicals. Such a semipermeable element can be easily, efficiently produced on a commercial scale.

Hollow fiber semipermeable membrane element and a method of producing

Thermoplastic elastomers of conjugated diolefins having 4 to 6 carbon atoms and monovinyl aromatic hydrocarbons are prepared by polymerizing 8 to 65 parts by weight of a monomer mixture A.sub.1 comprising a conjugated diolefin having 4 to 6 carbon atoms and a monovinyl aromatic hydrocarbon in a weight ratio of 85-10:15-90 in a hydrocarbon solvent and an inert atmosphere in the presence of 0.2 to 20 mmol., per 100 g. of the total amount of the mixture A.sub.1 and the mixture A.sub.2 described below, of a monolithium hydrocarbon calculated as active lithium to form an active copolymer, and after substantial completion of the polymerization, copolymerizing said active copolymer with 92 to 35 parts by weight of a monomer mixture A.sub.2 comprising the same conjugated diolefin having 4 to 6 carbon atoms and monovinyl aromatic hydrocarbon as said mixture A.sub.1 in a weight ratio of 95-20:5-80, such that the total amount of said mixtures A.sub.1 and A.sub.2 is 100 parts by weight, to thereby obtain a final copolymer having a monovinyl aromatic content of 10 to 70% by weight based on the total amount of said mixtures A.sub.1 and A.sub.2. The thus obtained thermoplastic elastomers have at least four polymeric blocks, and are comparable in elastic property to conventional thermoplastic elastomers and excellent in thermal resistance, resistance to oils and processability. Further, said thermoplastic elastomer does not require vulcanization or chemical cross-linking, and can be molded into an article having an excellent shape maintenance property.

Thermoplastic elastomers

An inline intravenous final filter unit especially of the bacteria-retentive type and adapted to be incorporated in administering sets for administering infusion solutions to patients. The filter unit comprises a casing having an inlet cap at its one end and an outlet cap at the other end thereof, at least one porous hollow fiber arranged within the casing in parallel to the longitudinal direction thereof and having a porosity rating of 0.1 to 5.mu., the hollow fiber being closed at its one end opposed to the inlet cap and open at the other end thereof opposed to the outlet cap, the hollow fiber further being tightly fixed at the outer peripheral portion of its open end to the inner wall of the casing by a securing member, and the ratio of the total effective filtration area of the hollow fiber to the capacity of the casing being at least about 4:1.

Inline intravenous final filter unit

An epoxy resin composition comprising an epoxy compound having an average of one or more epoxy groups per molecule, an amine curing agent and a reductive metal compound or complex can produce excellent developed color images, and concave-convex images by energy irradiation. The epoxy resin composition can give excellent physical, chemical and electrical properties to the formed images and various inorganic and organic materials can be used as substrate.

Epoxy resin composition for image formation

A photopolymerizable composition comprising a polyester-polyether block polymer which is useful for preparing relief images and printing plates.

Photosensitive compositions comprising a polyester-polyether block

An acrylic powder resin coating composition having good handling characteristics and capable of providing a coating having a well-balanced combination of the reflection sharpness and other physical properties is provided. This coating composition is prepared by incorporating in an acrylic copolymer resin a compound containing in the molecule one phenolic hydroxyl group and one carboxyl group and further containing at least one ester linkage between the benzene nucleus to which the phenolic hydroxyl group is bonded and the carboxyl group, said compound having a melting point of 45.degree. to 160.degree.C. and a number average molecular weight of up to 10,000. Especially good results are obtained when a polyester resin having a melting point of 40.degree. to 160.degree.C. and a number average molecular weight of 1,000 to 10,000 is further incorporated in this powder coating composition.

Powder coating composition

A photopolymerizable composition comprising a polyester - polyether block polymer which is useful for preparing relief images and printing plates.

An epoxy resin aqueous composition of the room-temperature hardening type having improved rust preventive, anti-corrosive and weatherproof properties, which comprises an aqueous dispersion containing

Aqueous epoxy resin composition containing a fatty acid polyamide

An epoxy resin composition having excellent curability comprising 100 parts by weight of an epoxy resin having at least two epoxy groups per molecule and about 1 to 300 parts by weight of an amide derivative of 4-aminomethyl-1,8-diaminooctane.

Epoxy resin composition including amide derivative of

A polyester obtained from dibasic acids mixture containing 10 to 50 mole-% of endomethylene-tetrahydrophthalic acid and glycols is used in a resin composition for powder coatings. This composition has a good storage stability and when heated in the air at 150.degree. to 220.degree.C exhibits favorable fluidity to form an even coating which quickly hardens to a film with excellent characteristics.

Polyester resin composition for powder coatings prepared from

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Yokohama, Japan

Kazuo Toyomoto