Ube Industries, Inc.

Shigeru Yao

Yukihiko Asano

Shyusei Ohya

Kenji Fukunaga

Tomonori Kanougi

Takashi Atoguchi

Tatsuya Shoji

Masayuki Kinouchi

Kenji Kawabata

Kimio Nakayama

Toshikazu Hamamoto

Kazuhiro Miyoshi

Koji Shiba

Yoshihisa Kakuta

Koji Shibata

Yuuichi Fujii

Yoichi Okubo

Hideo Sano

Takashi Kino

Takeshi Kita

Ryo Konishi

The present invention provides an optical filter comprising a crystalline polymer having a spherulite structure, particularly an optical filter comprising porous particles formed of a crystalline polymer in which single particles per se have a spherulite structure. This optical filter can convert linear polarized light to nonpolarized light close to natural light with high efficiency.

Optical filter

Polyamide porous spherical particles having a number-average particle diameter of 2 to 30 &#x3bc;m, a BET specific surface area of 100 to 80,000 m/kg, and a ratio of a volume-average particle diameter to the number-average particle diameter in the range of 1.52 to 2.50 is reduced in luminous reflectance.

Polyamide porous spherical particle

Silicon carbide-based fine particles containing an electrically conducting inorganic substance and a electromagnetic wave absorbing material, which are fine particles comprising a particle inner portion of a silicon carbide-based material and a surface layer formed of an electrically conducting inorganic substance mainly comprising carbon, wherein a gradient layer with the compositional ratio of the electrically conducting inorganic substance gradiently increasing toward the particle surface is present and the thickness of the electrically conducting inorganic substance gradient layer is from 1 to 500 nm. The electromagnetic wave absorbing material of the present invention can selectively absorb a electromagnetic wave of 1 to 300 GHz in a wide band.

Electrically conducting-inorganic substance-containing silicon carbide-based fine particles, electromagnetic wave absorbing material and electromagnetic wave absorber

Porous spherical particles of polyamide 11 or polyamide 12 can be produced by an industrially advantageous process which comprises the steps of mixing a polyamide solution of polyamide 11 or polyamide 12 dissolved in a phenol compound and a low molecular weight aliphatic alcohol which is a poor solvent for the polyamides but is well compatible with the phenol compound in the presence of a high molecular weight alkylene glycol to prepare a mixture solution having an initial viscosity of 10 mPa&#xb7;s or more, and allowing the mixture solution to stand, to precipitate polyamide particles.

Process for producing porous spherical polyamide particle

A porous insulating film comprising a highly heat resistant resin film having a fine porous structure with a mean pore size of 0.01-5 &#x3bc;m in at least the center of the film, and a porosity of 15-80%. A laminate is prepared by forming a heat resistant adhesive layer or a conductive metal layer or an inorganic or metal substrate on one or both sides of the porous insulating film or by forming an inorganic or metal substrate on one side of the porous insulating film and a conductive metal layer on the other side.

Porous insulating film and its laminates

Disclosed are a proton type &#x3b2; zeolite in which an acid site showing a desorption peak with a range of &#xb1;100&#xb0; C. with a center of 330&#xb0; C. exists in a spectrum measured by the ammonia temperature programmed desorption method (NH-TPD), and an amount of a strong acid site showing a desorption peak of 500&#xb0; C. or higher is controlled to 2.5 &#x3bc;mol/g or less, a method for preparing the same, and a process for preparing a phenol compound by oxidizing a benzene compound with a peroxide in the presence of the proton type &#x3b2; zeolite.

Proton type &#x3b2;  zeolite, preparation method thereof and process for preparing phenol compound using the same

An electrode material for a secondary cell comprising as its essential component a powder of graphite having a crystallinity of 90% or more obtained by graphitizing a highly heat resistant polymer compact in an anaerobic atmosphere and crushing into a powder, and a process for the production of an electrode material for a secondary cell comprising heating and graphitizing a composition in which 0-10 wt % of a boron compound is added to a highly heat-resistant polymer to produce a powder of graphite having crystallinity of 90% or more contained as its essential component. An electrode material for a secondary cell having excellent charge/discharge cycle life and discharge voltage performance is provided.

Electrode material for a secondary cell and its production process

A porous carbonized film with fine continuous pores, obtained by carbonization of a highly heat-resistant resin porous film in an anaerobic atmosphere, and a process for its production.

Porous carbonized film and process for its production

A polyimide porous film obtained by drying and imidizing a polyimide precursor porous film which is substantially homogeneous on both sides, the polyimide porous film having pores on both sides wherein the pores all satisfy the conditions: 1) the difference in the mean pore size of both sides is less than 200% based on the smaller average value of the mean pore size, 2) the coefficient of variation for the pore size on each side is smaller than 70%, 3) the coefficient of variation for the pore centroid distance on each side is smaller than 50%, and 4) the mean pore size on each side is 0.05-5 &mgr;m.

Polyimide porous film

A process for producing a zirconium oxide precursor comprising precipitating a zirconium oxide precursor from an alcoholic solution of a zirconium compound, and a process for producing zirconium oxide having infrared absorption peaks assigned to an S&mdash;O bond between 1010 cm and 1025 cm and between 1035 cm and 1050 cm , which comprises heat treating the zirconium oxide precursor prepared by the above process. The zirconium oxide precursor and the zirconium oxide obtained in the process are effective as a catalyst for removing or decomposing nitrogen oxides.

Zirconium oxide and zirconium oxide precursor and process for producing them

There are disclosed a process for producing a dihydric phenol which comprises oxidizing a monohydric phenol by a peroxide compound in the presence of a &bgr;-zeolite, a ketone and a phosphoric acid, and a process for producing a dihydric phenol which comprises oxidizing a monohydric phenol in the presence of a &bgr;-zeolite, a ketone and a phosphoric acid, by feeding a monohydric phenol, hydrogen peroxide, a ketone and a phosphoric acid into a reactor in which a &bgr;-zeolite is charged, to oxidize the monohydric phenol into a dihydric phenol, and delivering the resultant reaction mixture from the reactor.

Growing community of inventors

Ichihara, Japan

Shigeru Yao