Abstract: A method for manufacturing an externally circular precursor lens that is processed into a rim-shaped lens includes inputting processing data to specify the shape of the rim-shaped lens, and processing a material block based on the processing data so as to manufacture a precursor lens. An elliptical virtual rim surrounding the precursor lens manufactured at that time is imaginarily set, and is processed based on the processing data up to that range, and, outside the virtual rim, an amount of sag is changed to secure the edge thickness of the precursor lens. This method for manufacturing a precursor lens for a rim-shaped lens reduces an excessive load imposed on a processing tool during processing, allows the precursor lens to be processed into a rim-shaped lens while satisfactorily maintaining its edge thickness without the lack of the edge of the precursor lens, and results in a thin lens.

Abstract: Disclosed is an ultraviolet oxidation device for decompositing organic materials present in water in low energy consumption and low cost, an ultrapure water production device using the same, an ultraviolet oxidation method, and an ultrapure water production method. An ultraviolet oxidation device including: a flow tank 10; photocatalyst fibers 12; an ultraviolet radiating unit 14; and an ultraviolet radiating unit housing unit 16 which is arranged to occupy an entire cross-section of the flow tank intersecting with flowing direction of the water to be processed in the flow tank 10; wherein the ultraviolet radiating unit housing unit 16 is constructed such that the water to he processed flows toward the ultraviolet radiating unit 14 from an upstream side, and after flowing in the housing unit 16, the water to be processed flows out to a downstream side, and is formed of a material that allows the ultraviolet rays from the ultraviolet radiating unit 14 to radiate the photocatalyst fibers 12.

Abstract: Provided are a high-activity photocatalyst fiber and a production method thereof. The photocatalyst fiber is a silica-based composite oxide fiber including a composite oxide phase of an oxide phase (first phase) mainly including a silica component and a metal oxide phase (second phase) including a metal other than silica, in which the ratio of at least one or more metal elements present in a metal oxide constituting the metal oxide phase (second phase) increases gradiently toward the fiber surface, a metal constituting the metal oxide phase (second phase) is formed in the form of particles, mesopores having an average micropore diameter of 2 nm to 30 nm are formed between the particles from the fiber surface toward the inside of the fiber, and platinum (Pt) particles having an average particle diameter of 0.5 nm to 10 nm are supported inside the mesopores.

Abstract: A silica base composite photocatalyst that has appropriate water purification capability, inhibiting precipitation of metal oxides; and a process for producing the same. The silica base composite photocatalyst is one composed mainly of a composite oxide phase consisting of an oxide phase (first phase) composed mainly of silica component and a titania phase (second phase) wherein the ratio of presence of the second phase increases aslope toward the surface layer, characterized in that at least one metal oxide selected from among strontium titanate and barium titanate is contained in the second phase.

Abstract: It is to provide an aqueous polyurethane dispersion which gives a coating film excellent in abrasion resistance. It is an aqueous polyurethane resin dispersion which comprises a polyurethane resin obtained by reacting (A) a polyurethane prepolymer which is obtained by reacting (a) a polyisocyanate compound, (b) a polyol compound containing a polycarbonate polyol having an alicyclic structure, and (c) a polyol compound having an acidic group, and (B) a chain elongating agent having a reactivity with the isocyanate group of (A) the polyurethane prepolymer, being dispersed in an aqueous medium, a content of an alicyclic structure is 26.0 to 60.0% by weight in terms of a solid component(s), and a sum of a content of an urethane boding and a content of a urea bonding is 17.7 to 30.0% by weight in terms of a solid component(s).

Abstract: A method for manufacturing an externally circular precursor lens that is processed into a rim-shaped lens includes inputting processing data to specify the shape of the rim-shaped lens, and processing a material block based on the processing data so as to manufacture a precursor lens. An elliptical virtual rim surrounding the precursor lens manufactured at that time is imaginarily set, and is processed based on the processing data up to that range, and, outside the virtual rim, an amount of sag is changed to secure the edge thickness of the precursor lens. This method for manufacturing a precursor lens for a rim-shaped lens reduces an excessive load imposed on a processing tool during processing, allows the precursor lens to be processed into a rim-shaped lens while satisfactorily maintaining its edge thickness without the lack of the edge of the precursor lens, and results in a thin lens.

Abstract: An object is to provide a silica-based composite oxide fiber which is a continuous fiber high in strength and has, in the fiber surface thereof, mesopores each having an appropriate size, and to provide a catalyst fiber, containing the silica-based composite oxide fiber, in which a noble metal catalyst can be selectively carried into its pores, whereby preventing sintering of the noble metal catalyst.

Abstract: A silica base composite photocatalyst that has appropriate water purification capability, inhibiting precipitation of metal oxides; and a process for producing the same. The silica base composite photocatalyst is one composed mainly of a composite oxide phase consisting of an oxide phase (first phase) composed mainly of silica component and a titania phase (second phase) wherein the ratio of presence of the second phase increases aslope toward the surface layer, characterized in that at least one metal oxide selected from among strontium titanate and barium titanate is contained in the second phase.

Abstract: The present invention is characterized in that a base material is coated with a ceramic thin film comprising a composite phase composed of a first phase mainly formed of a silicon ceramic component and a second phase mainly formed of a ceramic component other than the silicon ceramic component of the first phase, in which the amount of fine crystal particles of at least one ceramic component that constitutes the second phase slopingly increases toward a surface layer. According to the present invention, there are provided a ceramic thin film coating material having a slope constitution, which not only has an excellent function such as a photocatalyst function, an electrical function, a thermal catalyst function or a catalyst-supporting function or environment resistance such as oxidation resistance, alkaline resistance or wear resistance but also has excellent dynamic properties, and a process for the production thereof.

Abstract: The present invention is characterized in that a base material is coated with a ceramic thin film comprising a composite phase composed of a first phase mainly formed of a silicon ceramic component and a second phase mainly formed of a ceramic component other than the silicon ceramic component of the first phase, in which the amount of fine crystal particles of at least one ceramic component that constitutes the second phase slopingly increases toward a surface layer. According to the present invention, there are provided a ceramic thin film coating material having a slope constitution, which not only has an excellent function such as a photocatalyst function, an electrical function, a thermal catalyst function or a catalyst-supporting function or environment resistance such as oxidation resistance, alkaline resistance or wear resistance but also has excellent dynamic properties, and a process for the production thereof.

Abstract: A silicon carbide fiber having a boron nitride layer in a fiber surface and having the following properties of a to c, a. the existent ratio of boron slopingly increases towards the surface of the fiber, b. the existent ratio of boron in the region of from the fiber surface to a depth of 500 nm is 0.5 to 1.5% by weight, c. the existent ratio of boron in a fiber central portion which is a region of a depth of at least 3 ?m below the fiber surface is 0 to 0.2% by weight, and a process for the production thereof.

Abstract: The present invention is characterized in that a base material is coated with a ceramic thin film comprising a composite phase composed of a first phase mainly formed of a silicon ceramic component and a second phase mainly formed of a ceramic component other than the silicon ceramic component of the first phase, in which the amount of fine crystal particles of at least one ceramic component that constitutes the second phase slopingly increases toward a surface layer. According to the present invention, there are provided a ceramic thin film coating material having a slope constitution, which not only has an excellent function such as a photocatalyst function, an electrical function, a thermal catalyst function or a catalyst-supporting function or environment resistance such as oxidation resistance, alkaline resistance or wear resistance but also has excellent dynamic properties, and a process for the production thereof.

Abstract: A silicon carbide fiber having a boron nitride layer in a fiber surface and having the following properties of a to c, a. the existent ratio of boron slopingly increases towards the surface of the fiber, b. the existent ratio of boron in the region of from the fiber surface to a depth of 500 nm is 0.5 to 1.5% by weight, c. the existent ratio of boron in a fiber central portion which is a region of a depth of at least 3 ?m below the fiber surface is 0 to 0.2% by weight, and a process for the production thereof.

Abstract: Polyetherpolyamide elastomer showing a low water absorption, a high stress relaxation, and a high elastic recovery percentage of elongation is obtainable by polymerizing an aminocarboxylic acid compound and/or a lactam compound, a triblock polyetherdiamine compound having the following formula, and a dicarboxylic acid compound: [x is a value of 1 to 20, y is a value of 4 to 50, z is a value of 1 to 20].

Abstract: A silicon carbide fiber having a boron nitride layer in a fiber surface and having the following properties of a to c, a. the existent ratio of boron slopingly increases towards the surface of the fiber, b. the existent ratio of boron in the region of from the fiber surface to a depth of 500 nm is 0.5 to 1.5% by weight, c. the existent ratio of boron in a fiber central portion which is a region of a depth of at least 3 ?m below the fiber surface is 0 to 0.2% by weight, and a process for the production thereof.

Abstract: A silica-based photocatalyst fiber having visible-light activity, which fiber comprises a composite oxide phase comprising an oxide phase (first phase) mainly made of a silica component and a titania phase (second phase), wherein the second phase contains a metal element other than titanium and the existent ratio of the second phase slopingly increases towards the surface of the fiber, and a process for the production thereof.

Abstract: A silica-based photocatalyst fiber having visible-light activity, which fiber comprises a composite oxide phase comprising an oxide phase (first phase) mainly made of a silica component and a titania phase (second phase), wherein the second phase contains a metal element other than titanium and the existent ratio of the second phase slopingly increases towards the surface of the fiber, and a process for the production thereof.

Abstract: Polyetherpolyamide elastomer showing a low water absorption, a high stress relaxation, and a high elastic recovery percentage of elongation is obtainable by polymerizing an aminocarboxylic acid compound and/or a lactam compound, a triblock polyetherdiamine compound having the following formula, and a dicarboxylic acid compound: 1

Abstract: A silicon carbide fiber having a boron nitride layer in a fiber surface, wherein the existent ratio of boron slopingly increases towards the surface of the fiber and the boron nitride layer has a layered structure which is parallel to the surface of the fiber, and a process for the production thereof.