Abstract: A heat-resistant release sheet is configured to be disposed, when a resin or a target including a resin is used in a step involving heating and melting of the resin, between the resin or the target and a member to be brought into contact with the resin or the target to prevent direct contact between the resin or the target and the member. The sheet includes a skived sheet including polytetrafluoroethylene (PTFE) or a modified PTFE. A content of a tetrafluoroethylene (TFE) unit in the modified PTFE is 99 mass % or more. In each of two directions being in-plane directions of the heat-resistant release sheet and being perpendicular to each other, a rate of dimensional shrinkage induced by heating at 175° C. for 30 minutes is more than 0%. The sheet includes the skived sheet including the heat-resistant resin but prevents occurrence of problems attributable to inclusion of the skived sheet.

Abstract: The polymer film of the present invention has through holes extending from one principal surface of the polymer film to the other principal surface of the polymer film. The through holes are straight holes having a central axis extending straight, and have a shape in which the area of a cross-section perpendicular to the direction of the central axis increases from the one principal surface of the polymer film toward the other principal surface. This polymer film has passages in its thickness direction, has an unconventional structure, and can be used in various applications, such as in a waterproof sound-permeable membrane, in a waterproof gas-permeable membrane, and in a suction sheet. The ratio a/b of the opening diameter a of the through holes at the one principal surface to the opening diameter b of the through holes at the other principal surface is 80% or is less than 80%.

Abstract: Provides is a waterproof sound-permeable membrane (10) adapted to permit passage of sound and prevent entry of water. The waterproof sound-permeable membrane (10) includes a sound-permeation region (11) having a polytetrafluoroethylene (PTFE) membrane (20). The polytetrafluoroethylene membrane (20) has an average pore diameter of 0.02 ?m or more and 0.1 ?m or less as measured according to ASTM F316-86 and has a porosity of 5% or more and 25% or less. The waterproof sound-permeable membrane (10) is suitable for application to an electronic device containing an acoustic device.

Abstract: The polymer film of the present invention has through holes extending from one principal surface of the polymer film to the other principal surface of the polymer film. The through holes are straight holes having a central axis extending straight, and have a shape in which the area of a cross-section perpendicular to the direction of the central axis increases from the one principal surface of the polymer film toward the other principal surface. This polymer film has passages in its thickness direction, has an unconventional structure, and can be used in various applications, such as in a waterproof sound-permeable membrane, in a waterproof gas-permeable membrane, and in a suction sheet. The ratio a/b of the opening diameter a of the through holes at the one principal surface to the opening diameter b of the through holes at the other principal surface is 80% or is less than 80%.

Abstract: A waterproof sound-permeable membrane (10) includes a polytetrafluoroethylene (PTFE) membrane (20). The PTFE membrane (20) is obtained by stretching a PTFE sheet so as to obtain a porous PTFE membrane having a porous structure including a plurality of fibrils and pores between the plurality of fibrils and then applying a pressure to only a region of one principal surface of the porous PTFE membrane in a thickness direction of the porous PTFE membrane or by applying a greater pressure to a region of one principal surface of the porous PTFE membrane than to a remaining region of the one principal surface other than the region to which the greater pressure is applied, in the thickness direction of the porous PTFE membrane. The PTFE membrane (20) has a low-density portion (21) having the porous structure and a high-density portion (22) having a lower porosity than the low-density portion (21).

Abstract: Provides is a waterproof sound-permeable membrane (10) adapted to permit passage of sound and prevent entry of water. The waterproof sound-permeable membrane (10) includes a sound-permeation region (11) having a polytetrafluoroethylene (PTFE) membrane (20). The polytetrafluoroethylene membrane (20) has an average pore diameter of 0.02 ?m or more and 0.1 ?m or less as measured according to ASTM F316-86 and has a porosity of 5% or more and 25% or less. The waterproof sound-permeable membrane (10) is suitable for application to an electronic device containing an acoustic device.

Abstract: Provided is a multilayer porous suction sheet having an unprecedented structure to prevent contact between a suction object and a suction surface of a suction unit when the sheet is disposed on the suction surface. The porous suction sheet includes a base layer having air permeability and a surface layer disposed on the base layer. The surface layer is made of a porous body composed of resin fine particles that are bonded together, one principal surface of the surface layer opposite to the other principal surface facing the base layer has a surface roughness (Ra) of 1.0 ?m or less, and the base layer and the surface layer are coupled together by an air-permeable adhesive layer disposed between the base layer and the surface layer. The base layer and/or the surface layer is made of, for example, ultrahigh molecular weight polyethylene (UHMWPE).

Abstract: Provided is a sliding member having excellent adhesion and slidability suitable for use as a transfer pad in an image forming apparatus. A sliding member (10) includes a porous body (1) that is a sintered body of ultrahigh molecular weight polyethylene (UHMWPE) particles and having a surface of the porous body (1) as a sliding surface (5). The sliding surface (5) has a particle occupation ratio of 50% or less, and a surface roughness Ra of 2.0 ?m or less. The sliding member (10) can be obtained by heating the porous body obtained by cutting the sintered body of UHMWPE particles to make the sliding surface (5) smoother than before the heating.

Abstract: A suction sheet (1) to be attached onto a suction surface (4a) of a suction apparatus (4) that holds an object by vacuum suction is provided with a substrate (2) and a porous body (3). The substrate (2) has one surface (2a) and the other surface (2b), and the one surface (2a) is brought into contact with the suction surface (4a). Further, a plurality of through holes (21) are provided in the substrate (2). The porous body (3) has a thickness of 1.4 mm or less, and is adhered onto the other surface (2b) of the substrate (2) so as to cover the through holes (21).

Abstract: Provided is a sliding member having excellent adhesion and slidability suitable for use as a transfer pad in an image forming apparatus. A sliding member (10) includes a porous body (1) that is a sintered body of ultrahigh molecular weight polyethylene (UHMWPE) particles and having a surface of the porous body (1) as a sliding surface (5). The sliding surface (5) has a particle occupation ratio of 50% or less, and a surface roughness Ra of 2.0 ?m or less. The sliding member (10) can be obtained by heating the porous body obtained by cutting the sintered body of UHMWPE particles to make the sliding surface (5) smoother than before the heating.

Abstract: An object is to provide an electrolyte membrane that maintains excellent cell characteristics for a long time under high temperature and low water retention, as this is the most important point in fuel cells. A process for producing a polymer electrolyte membrane for fuel cells is provided, which process comprises in sequence: forming graft molecular chains by graft-polymerization of a vinyl silane coupling agent on a polymer film substrate that has phenyl groups capable of holding sulfonic acid groups; introducing sulfonic acid groups into phenyl groups contained in the graft molecular chains; and hydrolyzing and condensing alkoxy groups contained in the graft molecular chains so that a silane crosslinked structure is introduced between the graft molecular chains. A polymer electrolyte membrane produced by the process is also provided.

Abstract: In the method for allowing a work object (15) to be sucked onto a suction unit (14) and the method for manufacturing a ceramic capacitor according to the present invention, a resin sheet (11) that has air permeability in a thickness direction is used as a suction sheet. In the resin sheet (11), air permeability is more enhanced than that of a conventional resin sheet while the diameter (opening diameter) of holes for ensuring air permeability serving as air passages is kept small. The resin sheet (11) is a non-porous sheet in which two or more through holes extending in a thickness direction of the non-porous sheet are formed. The through holes are straight holes extending linearly through the resin sheet. The through holes have a diameter of 20 ?m or less. The resin sheet has an air permeance, in the thickness direction, of 10 seconds/100 mL or less in terms of Gurley number measured in accordance with JIS P8117.

Abstract: Polymer ion-exchange membranes having outstanding electrical conductivity, water retention and oxidation resistance are produced by the steps of uniformly mixing an organic high-molecular weight resin with functional inorganics having the abilities to promote graft polymerization of polymerizable monomers, adsorb water and conduct protons, irradiating the resulting functional inorganics/polymer membrane to initiate graft polymerization or graft copolymerization of polymerizable monomers having functional groups, and then introducing sulfonic acid groups into the graft chains.

Abstract: The present invention relates to an electrolyte membrane including a graft polymer having a sulfonic acid group as a proton conductive group, in which, when the electrolyte membrane is divided into four equal parts in a thickness direction thereof, a content of the sulfonic acid group in each of outer regions is larger than a content of the sulfonic acid group in each of inner regions; in which A1, A2, B1 and B2 satisfy the following formula: 1.5?(A1+A2)/(B1+B2)?8, in which A1 and A2 each represent a maximum value of a distribution amount of the sulfonic acid group in each of the two outer regions, and B1 and B2 each represent an average value of a maximum value and a minimum value of a distribution amount of the sulfonic acid group in each of the two inner regions; and in which the electrolyte membrane has an ion-exchange capacity of 0.5 to 2 meq/g.

Abstract: A crosslinked nano-inorganic particle/polymer electrolyte membrane composed of a polymer film substrate, graft molecular chains bound to the backbone skeleton of the polymer film substrate and comprising a vinyl monomer graft-polymerized, sulfonic groups bound to the graft molecular chains, and an inorganic material as nano-scale particles uniformly dispersed within a crosslinked structure ascribed to the backbone skeleton of the polymer film substrate and the graft molecular chains, wherein the backbone skeleton of the polymer film substrate, the graft molecular chains, and the nano-inorganic particles mutually construct a crosslinked structure.

Abstract: By performing photograft polymerization of functional monomers such that grafted chains will be introduced from the surface of a polymer base film into its interior without deteriorating its inherent characteristics and also by creating a multiplex crosslinked structure between the grafted chains and the base film under such conditions as to cause preferential radiation-induced crosslinking reaction, there is produced a polymer electrolyte membrane having high enough oxidation resistance and proton conductivity to be suitable for use in fuel cells.

Abstract: A suction sheet (1) to be attached onto a suction surface (4a) of a suction apparatus (4) that holds an object by vacuum suction is provided with a substrate (2) and a porous body (3). The substrate (2) has one surface (2a) and the other surface (2b), and the one surface (2a) is brought into contact with the suction surface (4a). Further, a plurality of through holes (21) are provided in the substrate (2). The porous body (3) has a thickness of 1.4 mm or less, and is adhered onto the other surface (2b) of the substrate (2) so as to cover the through holes (21).

Abstract: The present invention relates to a sliding member including: a sheet-shaped slidable substrate; a dimension-retaining layer bonded to one main surface of the slidable substrate; and an adhesive layer or a pressure-sensitive adhesive layer formed on the dimension-retaining layer, in which the dimension-retaining layer has a tensile modulus of 2 GPa or higher.

Abstract: A method for producing a polymer electrolyte membrane for electrolyte fuel cells includes: irradiating gamma rays onto a polymer substrate to obtain a crosslinked polytetrafluoroetylene substrate, grafting a styrenic monomer and bis(vinylphenyl)ethane as monomers to the crosslinked polymer substrate, and introducing sulfonic acid groups into graft side chains formed by grafting. Fluoro polymer substrates such as polytetrafluoroethylene and ethylene tetrafluoroethylene copolymer may be used.

Abstract: The present invention relates to an electrolyte membrane including a graft polymer having a sulfonic acid group as a proton conductive group, in which, when the electrolyte membrane is divided into four equal parts in a thickness direction thereof, a content of the sulfonic acid group in each of outer regions is larger than a content of the sulfonic acid group in each of inner regions; in which A1, A2, B1 and B2 satisfy the following formula: 1.5?(A1+A2)/(B1+B2)?8, in which A1 and A2 each represent a maximum value of a distribution amount of the sulfonic acid group in each of the two outer regions, and B1 and B2 each represent an average value of a maximum value and a minimum value of a distribution amount of the sulfonic acid group in each of the two inner regions; and in which the electrolyte membrane has an ion-exchange capacity of 0.5 to 2 meq/g.