Tokuyama (TKYMF) USPTO patentsUtility application

A gas production apparatus including: an electrolysis vessel; first and second electrolyte circulation systems; and an electrolyte exchanger, the first/second electrolyte circulation system including: a first/second circulation tank receiving and storing a first/second electrolyte flowing out from an anode chamber/a cathode chamber; and a first/second circulation pump supplying the first/second electrolyte to the anode chamber/the cathode chamber, the electrolyte exchanger transferring part of the first electrolyte existing in the first electrolyte circulation system into the second electrolyte circulation system on one hand, and transferring part of the second electrolyte existing in the second electrolyte circulation system into the first electrolyte circulation system on the other hand.

A method of recovering the fly ash, including the firing step in which the raw fly ash powder containing the unburned carbon is fired to remove the unburned carbon by burning, characterized by further including the step of measuring the content of unburned carbon in the raw fly ash powder; and the sieve-classifying step of obtaining a fine fly ash powder which is the component under the sieve and has a decreased content of unburned carbon as a result of sieve-classifying the raw fly ash powder; wherein the perforation size of the sieve used in the sieve-classifying step is set depending upon the content of unburned carbon in the raw fly ash powder, the sieve having a small perforation size being used when the content of unburned carbon is large and the sieve having a large perforation size being used when the content of unburned carbon is small; and the fine fly ash powder which is the component under the sieve is recovered through the firing step.

A process for reforming the fly ash by heating a raw fly ash powder that contains the unburned carbon and thereby decreasing the content of the unburned carbon, characterized in that (a) as means for heating the raw fly ash powder, use is made of a heating unit that heats the raw fly ash powder by passing it through a heated medium-fluidized bed, (b) a high-temperature gas stream is passed through the heating unit to form the heated medium-fluidized bed and to fluidize and convey the raw fly ash powder that is thrown into the medium-fluidized bed, (c) the flow rate of the high-temperature gas stream is so set that the raw fly ash powder thrown into the heating unit is all heated in the medium-fluidized bed and is taken out from a take-out port provided at an upper part of the heating unit but that the particulate medium forming the medium-fluidized bed is not discharged from the take-out port, (d) the fly ash powder after heated and discharged from the take-out port of the heating unit is introduced into an air classifier where it is separated into a fine powder and a coarse powder, (e) the fine powder separated by the air classifier is recovered as the reformed fly ash, and (f) the coarse powder separated by the air classifier is measured for its content of the unburned carbon and when the measured value is larger than a predetermined threshold value, the coarse powder is introduced again into the heating unit so as to be heated again and when the measured value is smaller than the threshold value, the powder is recovered as the reformed fly ash.

Provided is a novel spherical polymethylsilsesquioxane particle having an unprecedentedly large specific surface area ratio.

The present invention aims to provide a method for producing granules for ceramic production, the method having high productivity and making it possible to obtain a ceramic which, when produced by press molding the granules and firing the resulting press molded product, has physical properties kept from lowering.

The present invention relates to a urethane resin obtained by reacting a polymerizable composition containing at least a urethane prepolymer (B2) having an iso(thio)cyanate group at an end of a molecule thereof, which is obtained by reacting a bifunctional active hydrogen-containing compound (C1) having two groups having active hydrogen in a molecule thereof and a bifunctional iso(thio)cyanate group-containing compound (B1) having two iso(thio)cyanate groups in a molecule thereof, a polyrotaxane (A) having a composite molecular structure formed by an axial molecule and a plurality of cyclic molecules clathrating the axial molecule, in which side chains having a group having active hydrogen are introduced into at least a part of the cyclic molecules, and a polyfunctional active hydrogen-containing compound (C2) other than the polyrotaxane (A) and having three or more groups having active hydrogen in a molecule thereof.

The present invention includes: a photochromic adhesive composition containing (A) a photochromic compound having, as a substituent, a molecular chain having a molecular weight of 300 or more, and (B) an adhesive urethane (urea) resin, and having a softening point of 140 to 220° C., and a photochromic laminate using the adhesive composition.

Provided is a method of producing a quatenary alkyl ammonium hypochlorite solution with an excellent storage stability.

The invention is a polyrotaxane monomer (A) having a composite molecular structure composed of cyclic molecules and an axial molecule that skewer-like threads through the rings of the cyclic molecules and has a bulky group at both ends thereof so as not to dethread the rings, and the polyrotaxane monomer has a polymerizable functional group in the molecule and has a water content of 5000 ppm or less.

An aluminum nitride particle including: a plurality of planes randomly arranged in a surface of the particle, the plurality of planes forming an obtuse ridge part or an obtuse valley part in the surface of the particle, the plurality of planes being observable in a scanning electron micrograph with 500 times magnification; wherein the particle has a longer diameter L of 20 to 200 μm; a ratio L/D of the longer diameter L (unit: μm) to a shorter diameter D (unit: μm) of the particle is 1 to 1.25; and the plurality of planes comprise a first plane, wherein an area S (unit: μm2) of the first plane satisfies S/L≥1.0 μm.

A crushed polycrystalline silicon lump is provided in which a surface metal concentration is 15.0 pptw or less and preferably 7.0 to 13.0 pptw, and in the surface metal concentration, a surface tungsten concentration is 0.9 pptw or less and preferably 0.40 to 0.85 pptw, and a surface cobalt concentration is 0.3 pptw or less and preferably 0.04 to 0.08 pptw.

The electrolysis vessel for alkaline water electrolysis includes an anode end unit, a cathode end unit, anode chamber cells, cathode chamber cells, and separating membranes.

A silicone oil-treated fumed silica and a method of producing the silicone oil-treated fumed silica are provided.

A hammer (1) for use in shape processing of a silicon block is a hammer for crushing a silicon block so as to carry out shape processing with respect to the silicon block, the hammer including: a handle (10) made of a resin; and a hammer head (20) fixed to the handle (10).