Oji Holdings Corporation

Kōtō-ku, Japan

Oji Holdings Corporation

Kōtō-ku, Japan
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This optical element has, on one surface thereof, a plurality of recessed sections arranged at a most frequent pitch equal to or less than the wavelength of light in the operating environment, the optical element having, when seen in plan view, a plurality of domains in which the plurality of recessed sections are aligned in a predetermined arrangement, and a plurality of protruding sections formed in a region sandwiched between the plurality of domains and/or in a region surrounded by the plurality of recessed sections inside the domains, the plurality of protruding sections accounting for a surface area ratio of 1%-15% as seen in plan view.


Patent
Oji Holdings Corporation | Date: 2017-08-09

Provided is a biaxially stretched polypropylene film for capacitors having a thin thickness and having excellent initial voltage resistance and excellent long-term heat resistance and voltage resistance, and also provided is a metallized polypropylene film for capacitors. The polypropylene film for capacitors is obtained by biaxially stretching a polypropylene resin, the polypropylene film having a crystallite size of 122 or less as determined by the Scherrers equation from the half width of the reflection peak from (040) plane of -crystal measured by a wide angle X-ray diffraction method, and the polypropylene film having a value of birefringence Nyz with respect to a thickness direction of 7.0 x 10^(-3) or more and 10.0 x 10^(-3) or less as measured by an optical birefringence measurement.


Patent
Oji Holdings Corporation | Date: 2017-03-01

It is an object to provide a composite in which the adhesion between a sheet layer and a curable resin layer or a film layer is high, and which has high strength and high transparency. The present invention provides a composite wherein a curable resin layer or a film layer is laminated on the one or both surfaces of the sheet layer with a covering layer interposed therebetween, the sheet layer containing fine fibers with an average fiber width of 2 to 1000 nm.


An object of the present invention is to provide a method for producing an ultrafine fiber-containing sheet with suppressed yellowing. Another object of the present invention is to provide an efficient method for eliminating an introduced substituent, and a composite sheet comprising an organic layer and/or an inorganic layer laminated on the obtained sheet. The present invention provides a method for producing an ultrafine fiber-containing sheet, comprising (a) introducing a substituent having electrostatic and/or steric functionality to a fiber raw material to obtain substituent-introduced fiber; (b) machine-processing the substituent-introduced fiber obtained in the step (a) to obtain substituent-introduced ultrafine fiber; (c) preparing a sheet from the substituent-introduced ultrafine fiber obtained in the step (b); and (d) eliminating at least a portion of introduced substituents from the sheet obtained in the step (c). In a preferred aspect, the substituent having electrostatic and/or steric functionality is a phosphoric acid-derived group, and the method may further comprise, after the step (a) and before the step (c), the step of (e) changing the degree of neutralization of the substituent-introduced fiber or the substituent-introduced ultrafine fiber.


Patent
Oji Holdings Corporation | Date: 2017-02-08

The present invention addresses the problem of providing a biaxially stretched polypropylene film for capacitors, which has high voltage resistance and excellent breakdown properties. The present invention also addresses the problem of providing a biaxially stretched polypropylene film for capacitors, which can be used suitably in a high-capacity capacitor to which a high voltage is to be applied under a higher temperature, and which preferably has a small thickness. The present invention relates to a biaxially stretched polypropylene film for capacitors, wherein a polypropylene resin which constitutes the polypropylene film has a number average molecular weight of 40,000 to 100,000 inclusive and a Z average molecular weight of 950,000 to 1,500,000 inclusive, wherein, in a molecular weight distribution curve, the value of the difference obtained by subtracting a differential distribution value at a logarithmic molecular weight Log (M) of 6.0 from a differential distribution value at a logarithmic molecular weight Log (M) of 4.5 is -15 to 11% inclusive.


Patent
Oji Holdings Corporation | Date: 2017-08-23

An object of the present invention is to provide a salt water thickener that uniformly (favorably) disperses ultrafine cellulose fibers even in a liquid containing a salt (electrolyte). The salt water thickener comprises ultrafine cellulose fibers and a water-soluble polymer and can thereby uniformly disperse the ultrafine cellulose fibers even in a liquid containing a salt. The salt water thickener of the present invention is uniformly dispersed even in a liquid containing a salt and therefore exerts a high viscosity. The salt water thickener of the present invention can also be used as an additive for a fluid. The salt water thickener of the present invention can be used for purposes, for example, subterranean formation processing.


Patent
Oji Holdings Corporation | Date: 2017-06-21

The optical element according to the present invention is provided with, on a substrate, an anti-reflection layer on which a plurality of small concave protrusions, which have a modal pitch less than or equal to a wavelength of light in an environment where the optical element is to be used, are formed; wherein 80% or more of the concave protrusions include one or more steps, and satisfy the following conditions: 0.12d w_(s) 0.17d and 0.42h z_(s) 0.52h, wherein d is a diameter of the concave protrusions, h is a depth of the concave protrusions, w_(s) is a total width of the steps in any cut surface; and z_(s) is an average depth of the steps.


Patent
Oji Holdings Corporation | Date: 2017-05-03

A main object is to provide a biaxially stretched polypropylene film for capacitors that has high voltage resistance at high temperatures and excellent dielectric breakdown properties and that can be formed into an ultrathin film. Furthermore, a capacitor obtained by using the biaxially stretched polypropylene film for capacitors described above is provided. The biaxially stretched polypropylene film for capacitors, includes a polypropylene resin, and the film has a spacing value of (040) face of -crystal measured by X-ray diffraction of 0.525 to 0.530 nm.


Patent
Bridgestone and Oji Holdings Corporation | Date: 2016-01-20

Provided are a rubber composition provided with excellent reinforcement properties by improving the dispersibility of fibers in a rubber component when the fibers are added to the rubber, a method for manufacturing the same, a vulcanized rubber, and a tire. A rubber composition comprising a rubber component and short fibers, wherein the short fibers are cationized. A method for manufacturing the rubber composition, comprising a mixing step for mixing cationized short fibers and rubber latex to prepare a rubber-short fiber mixed solution, and a drying step for drying the rubber-short fiber mixed solution to give a rubber composition.


Patent
Oji Holdings Corporation | Date: 2016-03-30

A primary object of the present invention is to provide a thermosensitive recording material that achieves high recording density and excellent preservability of a recorded part, or to provide a thermosensitive recording material that achieves high recording density, and excellent heat resistant and resistance to thermal background fogging property in a high temperature environment, as well as excellent sticking resistance and resistance to dirt adhesion of head. The present invention is a thermosensitive recording material having a thermosensitive recording layer containing at least a leuco dye and a developer on a support; the thermosensitive recording material containing, as the developer, a sulfonamide compound represented by general formula (1); (a) the thermosensitive recording material further having a protective layer on the thermosensitive recording layer; the protective layer containing at least one type of adhesive agent selected from the group consisting of water soluble adhesive agents and water dispersible adhesive agents; and at least one of the thermosensitive recording layer or the protective layer containing a water resistance-imparting agent; or (b) the thermosensitive recording layer further containing saturated fatty acid amide represented by general formula (2).

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