Mitsubishi Chemical Corporation

Mitsubishi Kasei Corporation

Kanebo, Limited

Eiji Hattori

Yasuo Oguri

Naoto Kijima

Hideaki Kaneda

Koji Shima

Takashi Hase

Masaru Utsunomiya

Yusuke Izawa

Yasuo Shimomura

Yutaka Mori

Keiichi Seki

Tomoyuki Kurushima

Toru Tagawa

Hiroyuki Sasaki

Michihiro Ikeda

Tetsuro Ota

Tomoko Takahashi

Nobuhiro Kodama

Kouichi Adachi

The present invention relates to a method for producing tetrahydrofuran comprising: feeding raw material 1,4-butanediol containing gamma butyrolactone to a reaction tank, and performing a dehydration cyclization reaction in the presence of a homogeneous acid catalyst having a pKa of 4 or less and being dissolvable in 1,4-butanediol to produce tetrahydrofuran, wherein a gas containing tetrahydrofuran, gamma butyrolactone and water in the reaction tank is introduced into a heat exchanger and when obtaining a condensate from the outlet of the heat exchanger, the ratio of the concentration of gamma butyrolactone in the condensate based on the concentration of gamma butyrolactone in the raw material 1,4-butanediol is from 20 to 100%.

Method for producing tetrahydrofuran

The present invention relates to a phosphor that satisfies requirements (1) to (3): The phosphor of the present invention has a high luminous efficiency and emits light of orange to red with high luminance. The use of the phosphor makes it possible to produce a light-emitting device, an illumination apparatus, and an image display, having a high efficiency and excellent color rendering properties.

Phosphor and light-emitting device using same

To enhance emission efficiency and color rendering, a light emitting devicecomprises: at least one light source; at least one first emitting sectionhaving at least one sort of luminescent material that can emit light including a wavelength component that is longer than the light emitted from light sourcewhen excited by the light emitted from light source; at least one second emitting sectionhaving at least one sort of luminescent material that can emit light including a wavelength component that is longer than the light emitted from first emitting sectionwhen excited by the light emitted from light sourceand first emitting section; wherein light emitting devicecomprises at least one light shielding unitthat protects at least a part of the light emitted from first emitting sectionfrom entering second emitting section

Light emitting device, lighting system, backlight unit for display device and display device

To enhance emission efficiency and color rendering, a light emitting device includes: at least one light source; at least one first emitting section having at least one sort of luminescent material that can emit light including a wavelength component that is longer than the light emitted from light source when excited by the light emitted from light source; at least one second emitting section having at least one sort of luminescent material that can emit light including a wavelength component that is longer than the light emitted from first emitting section when excited by the light emitted from light source and first emitting section; wherein light emitting device includes at least one light shielding unit that protects at least a of the light emitted from first emitting section from entering second emitting section.

Light emitting device, lighting system, backlight unit for display device, and display device

A light emitting device for enhancing emission efficiency and color rendering, comprising: a light source; a first emitting section having a luminescent material emitting light including a wavelength component longer than that of light from the light source when excited by the light from the light source; a second emitting section having a luminescent material emitting light including a wavelength component longer than that of the light from the first emitting section when excited by the lights from the light source and the first emitting section; and a light exit side from which the light from the light source, the first light-emitting section and the second light-emitting section emerges outside; and the first emitting section and the second emitting section are opened at the light exit side, and an area of a boundary surface between the first emitting section and the second emitting section is equal to or less than fifty percent of the surface area of the first emitting section.

Light emitting device, and lighting system, backlight for display and display using the same

An electroviscous fluid comprising an electrically insulated liquid and solid ectrolyte particles dispersed therein.

Electroviscous fluid containing .beta.-alumina

An electroviscous fluid comprising an electrically insulating liquid and solid electrolyte particles dispersed therein.

Electroviscous fluid

A dental filling composition comprising a polymerizable monomer and an inorganic filler, characterized in that the inorganic filler comprises (A) 20 to 80% by weight of spherical inorganic oxide particles with an average particle size of from 1.0 to 5.0 .mu.m, and (B) 80 to 20% by weight of spherical inorganic oxide particles which have a particle size range of at least 0.05 .mu.m and less than 1.0 .mu.m and at least 5% by weight of which is in a particle size range of from 0.05 to 0.2 .mu.m. The dental filling composition may have a high content of the inorganic filler and, upon curing, has good mechanical strength, good surface glass and smoothness, low water absorption, and transparency compared to that of natural teeth, in which smaller particles are sufficiently packed in interstices among larger particles, and smaller particles serve also for the good transparency.

Dental filling composition

An electroviscous fluid comprising an electrical insulating liquid and fine particles dispersed therein, wherein the fine particles are spherical particles containing an electrolytic solution, obtained by hydrolysis and polycondensation of a metal alkoxide or its derivative.

A resin composition having inorganic filler particles with an average particle size of from 0.05 to 150 .mu.m incorporated in an amount of from 20 to 85% by volume based on the entire resin composition, wherein:

Resin composition

A method for preparing silica gel particles, which comprises suspending a mixed solution of a silicic acid ester and water in an organic liquid immiscible with the mixed solution, followed by gelation wherein said organic liquid contains an ethyl cellulose having an ethoxy group content of at least 47% by weight and being soluble in the organic liquid.

Growing community of inventors

Tokyo, Japan

Eiji Hattori