Kuraray Co., Ltd.

Keiji Kubo

Tomohiro Ono

Takashi Fukumoto

Hiroyuki Ohgi

Daiki Noguchi

Shinji Nakai

Takeshi Nakano

Katsuya Fujisawa

Katsuji Ujita

Takahiro Kitano

Atsushi Nagasawa

Taketomo Yamashita

Nozomu Sugoh

Kenta Takemoto

A polymer comprising a structural unit derived from a compound (A) represented by formula (I):

Polymer, and oxygen absorbent and resin composition using same

The present invention provides a polymer which has a polymerizable functional group but still can be thermoformed without being crosslinked and which undergoes crosslinking upon irradiation with an active energy ray after being formed, and a composition including the polymer. An active energy ray crosslinkable thermoplastic polymer includes specific monomer units (1). The ratio of the number of moles of the monomer units represented by the general formula (1) to the number of moles of all monomer units constituting the polymer is not less than 1 mol %. The number average molecular weight (Mn) of the active energy ray crosslinkable thermoplastic polymer is 20,000 to 500,000.

Active energy ray crosslinkable thermoplastic polymer and composition containing the same

Provided is an unsaturated double bond-containing compound capable of sufficiently advancing a crosslinking reaction or a curing reaction when used for a coating material or the like and having oxygen absorption performance. The present invention also provides an oxygen absorbent containing the unsaturated double bond-containing compound and a resin composition containing the same. Provided are an unsaturated double bond-containing compound represented by general formula (I), an oxygen absorbent containing the same, and a resin composition.

Compound containing unsaturated double bond, oxygen absorber comprising same, and resin composition

An electrolyte membrane having a structure wherein fine rubber particles having substantially no ion-conducting group and having an average particle size of 20 nm to 1 &#x3bc;m are uniformly dispersed in a matrix including a resin component having ion-conducting group. The electrolyte membrane has high bonding ability to electrodes and does not cause cracks and ruptures because it is kept flexible even under low humid or absolutely dried condition, in addition, shows high ion conductivity even under low humid or absolutely dried condition because the matrix having ion-conducting groups are continuous.

Electrolyte membrane and membrane-electrode assembly

In a membrane-electrode assembly for polymer electrolyte fuel cells comprising a polymer electrolyte membrane and two gas diffusion electrodes being bonded to the membrane so that the membrane can be between them, at least one catalyst layer constituting the gas diffusion electrodes characterized in that the ion-conductive binder comprises a block copolymer having a particle size of 1 &#x3bc;m or less comprising a polymer block (A) having ion-conductive groups and a polymer block (B) having no ion-conductive group, both polymer blocks phase separate from each other, polymer block (A) forms a continuous phase, and the contact parts of the block copolymer with catalyst particles are comprised of polymer block (A) having ion-conductive groups; a membrane-electrode assembly and a polymer electrolyte fuel cell.

Catalyst layer and preparation process thereof, and membrane-electrode assembly and polymer electrolyte fuel cell using the catalyst layer

A membrane-electrode assembly for polymer electrolyte fuel cells comprising a polymer electrolyte membrane and two gas diffusion electrodes being bonded to the membrane so that the membrane can be between them, in which assembly each gas diffusion electrode is comprised of an electrode catalyst layer and a gas diffusion layer, intermediate layer(s) being an ion conductor is/are arranged between the electrode catalyst layer(s) and the membrane, the ion conductor mainly comprises a block copolymer comprising a polymer block (A) having ion-conductive groups and a polymer block (B) having no ion-conductive group, both blocks phase-separate from each other, (A) forms a continuous phase, and the contact part(s) of the intermediate layer(s) with the polymer electrolyte membrane and the contact part(s) of the intermediate layer(s) with the electrode catalyst layer(s) are comprised of polymer block (A) having ion-conductive groups; and a polymer electrolyte fuel cell wherein the assembly is used. By the invention, a membrane-electrode assembly and a fuel cell are provided which are economical, environment-friendly, good in moldability, and small in interface resistance and excellent in power generation efficiency.

Membrane-electrode assembly and polymer electrolyte fuel cell

This invention aims to make it possible to obtain curing surfaces with different surface free energies, and to provide a method of curing an ionizing radiation curing resin composition which can be used as a coating material. Further, it aims to provide a surface modification method which permits surfaces of different surface free energy to be obtained. The above object is achieved by a method of curing a mixture comprising an ionizing radiation curing resin, characterized in that at least part of a mixture comprising 0.01-10 weight parts of a compound (b) having a surface free energy not exceeding 25 mN/m relative to 100 weight parts of an ionizing radiation curing resin composition (a) having a surface free energy of at least 30 mN/m, is cured by irradiating it with ionizing radiation in contact with a medium having a surface free energy higher than that of the ionizing radiation curing resin composition (a).

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Tsukuba, Japan

Keiji Kubo