A paper suitable for use as a separator paper in electrochemical cells and an electrochemical cell comprising same, the paper comprising as the sole fibrous components 95 to 100 weight percent fibrils and 0 to 5 weight percent aramid fibrids and having a thickness of 10 to 40 micrometers and a tensile strength of at least 15 megapascals or greater, the fibrils comprising a polymer blend of 80 to 96 weight percent polyparaphenylene terephthalamide and 4 to 20 weight percent of polyvinylpyrrolidone; the fibrils having a diameter of 10 to 2000 nanometers, a length of 0.2 to 3 millimeters, a surface area of 3 to 40 square meters/gram, and a Canadian Standard Freeness of 0 to 10 milliliters.

An aqueous coating material for synthetic papers includes 26 wt % to 75 wt % of an acrylic emulsion, 2 wt % to 10 wt % of hollow latex microspheres and 26 wt % to 70 wt % of an inorganic ink-absorbing material. Each of the hollow latex microspheres has a particle size between 500 nm and 1100 nm, and includes a hollow core, a buffering layer covering the hollow core, and a shell covering the buffering layer. The aqueous coating material can be applied onto a surface of a synthetic paper substrate and formed into a surface coating layer.

To provide a medical sheet with which a surface (a portion) subjected to ion bombardment, and a surface (a portion) which has not been subjected to ion bombardment can be distinguished from each other; and a production method therefor. When b refers to the difference between value b1, which is the b value of a roughened surface portion 3, and value b2, which is the b value of a second surface 7, this medical sheet has a b in the range of 1.5-11 inclusive. A production method for the medical sheet includes: a surface roughening step in which a portion or the entirety of a first surface 5 of a sheet including polytetrafluoroethylene is subjected to surface roughening treatment to form a roughened surface portion 5; and a heating step in which the sheet which includes the polytetrafluoroethylene and which has undergone the surface roughening step is heated to obtain the medical sheet.

A paper suitable for use as a separator paper in electrochemical cells and an electrochemical cell comprising same, the paper comprising as the sole fibrous components 95 to 100 weight percent fibrils and 0 to 5 weight percent aramid fibrids and having a thickness of 10 to 40 micrometers and a tensile strength of at least 15 megapascals or greater, the fibrils comprising a polymer blend of 80 to 96 weight percent polyparaphenylene terephthalamide and 4 to 20 weight percent of polyvinylpyrrolidone; the fibrils having a diameter of 10 to 2000 nanometers, a length of 0.2 to 3 millimeters, a surface area of 3 to 40 square meters/gram, and a Canadian Standard Freeness of 0 to 10 milliliters.

A paper suitable for use as a separator paper in electrochemical cells and an electrochemical cell comprising same, the paper comprising as the sole fibrous components 95 to 100 weight percent fibrils and 0 to 5 weight percent aramid fibrids and having a thickness of 10 to 40 micrometers and a tensile strength of at least 15 megapascals or greater, the fibrils comprising a polymer blend of 80 to 96 weight percent polyparaphenylene terephthalamide and 4 to 20 weight percent of polyvinylpyrrolidone; the fibrils having a diameter of 10 to 2000 nanometers, a length of 0.2 to 3 millimeters, a surface area of 3 to 40 square meters/gram, and a Canadian Standard Freeness of 0 to 10 milliliters.

A non-woven fabric that absorbs only a small amount of volatile low molecular weight compound, and that has good texture when used as a non-woven fabric that makes contact with human skin. This thermal bond non-woven fabric containing cyclic olefin resin includes at least: fibers (A) containing at least 50 mass % of a cyclic olefin resin (A1) having a glass transition temperature Tg.sub.A1 C.; and fibers (B) containing at least 10 mass % of either a cyclic olefin resin (B1) having a glass transition temperature Tg.sub.B1 C., or a crystalline thermoplastic resin (B2) having a melting point Mp.sub.B2 C.; the fibers (A) and the fibers (B) being heat-spliced together; wherein Tg.sub.A1>Tg.sub.B1 or Tg.sub.A1>Mp.sub.B2, and either the difference between the glass transition temperature Tg.sub.A1 C. and the glass transition temperature TgB1 C. or the difference between the glass transition temperature Tg.sub.A1 C. and the melting point Mp.sub.B2 C. exceeds 20 C.

A non-woven fabric that absorbs only a small amount of volatile low molecular weight compound, and that has good texture when used as a non-woven fabric that makes contact with human skin. This thermal bond non-woven fabric containing cyclic olefin resin includes at least: fibers (A) containing at least 50 mass % of a cyclic olefin resin (A1) having a glass transition temperature Tg.sub.A1 C.; and fibers (B) containing at least 10 mass % of either a cyclic olefin resin (B1) having a glass transition temperature Tg.sub.B1 C., or a crystalline thermoplastic resin (B2) having a melting point Mp.sub.B2 C.; the fibers (A) and the fibers (B) being heat-spliced together; wherein Tg.sub.A1>Tg.sub.B1 or Tg.sub.A1>Mp.sub.B2, and either the difference between the glass transition temperature Tg.sub.A1 C. and the glass transition temperature TgB1 C. or the difference between the glass transition temperature Tg.sub.A1 C. and the melting point Mp.sub.B2 C. exceeds 20 C.

The present invention relates to a process for manufacturing a composite article comprising cellulose pulp fibers and a thermoplastic matrix, wherein said process comprises the steps of: a) mixing a refined aqueous pulp suspension with a water suspension of thermoplastic fibers into a composition, b) forming the composition into a fiber web, c) dewatering the fiber web, d) drying the fiber web, and e) heating and pressing the dried fiber web from step d) to melt said thermoplastic fibers into a thermoplastic matrix and form a composite article.

The present invention relates to a process for manufacturing a composite article comprising cellulose pulp fibers and a thermoplastic matrix, wherein said process comprises the steps of: a) mixing a refined aqueous pulp suspension with a water suspension of thermoplastic fibers into a composition, b) forming the composition into a fiber web, c) dewatering the fiber web, d) drying the fiber web, and e) heating and pressing the dried fiber web from step d) to melt said thermoplastic fibers into a thermoplastic matrix and form a composite article.

A carbon substrate for a gas diffusion layer that has a porosity gradient in a thickness direction thereof, a gas diffusion using the carbon substrate, an electrode and a membrane-electrode assembly for a fuel cell that include the gas diffusion layer, and a fuel cell including the membrane-electrode assembly having the gas diffusion layer are provided. The gas diffusion layer has improved water discharge ability and improved bending strength both in the machine direction and cross-machine direction.