Abstract: A polyisocyanate composition includes at least a pentamethylenediisocyanate derivative. The polyisocyanate composition contains 5 mass % or more and 95 mass % or less of a uretdione derivative composed of an isocyanate bimolecular-product of pentamethylenediisocyanate.

Abstract: A self-repairing polyurethane resin material is produced by reaction of a polyisocyanate compound consisting of aliphatic polyisocyanate and/or araliphatic polyisocyanate with an active hydrogen group-containing compound, used for producing polyurethane resin having self-repairing properties, has an isocyanate group at its molecular terminal, contains an allophanate group and an isocyanate trimer, and the mole ratio of the allophanate group relative to the isocyanate trimer is 0.1 to 20.

Abstract: In a self-repairing polyurethane resin material produced by reaction of pentamethylenediisocyanate with an active hydrogen group-containing compound, the active hydrogen group-containing compound contains a polyol compound having a number average molecular weight of 100 to 2000 and an average functionality of 2 to 3.

Abstract: A polyisocyanate composition is produced by reaction of bis(isocyanatomethyl) cyclohexane with trimethylolpropane, and contains a trimethylolpropane-monomolecular-body obtained by reaction of three molecules of bis(isocyanatomethyl) cyclohexane with one molecule of trimethylolpropane, and a trimethylolpropane-bimolecular-body obtained by reaction of five molecules of bis(isocyanatomethyl) cyclohexane with two molecules of trimethylolpropane; and the molar ratio of trimethylolpropane-monomolecular-body relative to trimethylolpropane-bimolecular-body (trimethylolpropane-monomolecular-body/trimethylolpropane-bimolecular-body) contained in the polyisocyanate composition is 1.5 or more and 4.5 or less.

Abstract: Disclosed is a polyurethane resin which is obtained by a reaction between a polyisocyanate component, which contains 1,4-bis(isocyanatomethyl)cyclohexane including not less than 80% by mole of trans isomers, and an active hydrogen compound component.

Abstract: The eyewear material is an eyewear material containing thermoplastic polyurethane. The eyewear material has a tan ? peak at both less than 0° C. and 0° C. or more and 70° C. or less observed in dynamic viscoelasticity measurement in tensile mode under the measurement conditions of a temperature increase speed of 5° C./min and a measurement frequency of 10 Hz.

Abstract: Disclosed is a polyurethane resin which is obtained by a reaction between a polyisocyanate component, which contains 1,4-bis(isocyanatomethyl)cyclohexane including not less than 80% by mole of trans isomers, and an active hydrogen compound component.

Abstract: A polymerizable composition for an optical material of the present invention includes polyisocyanate (a) including aliphatic polyisocyanate (a1) and a modified aliphatic polyisocyanate (a2), an episulfide (b), and a polythiol (c).

Abstract: Disclosed is a polymerizable composition for an optical material containing polyisocyanate (a) including aliphatic polyisocyanate (a1) and a modified aliphatic polyisocyanate (a2); and polythiol (b) having a di- or higher functional thiol group, in which the modified aliphatic polyisocyanate (a2) is contained in the polyisocyanate (a) in the amount of less than or equal to 60 weight %.

Abstract: 1,4-bis(isocyanatomethyl)cyclohexane contains 70 mol % or more and 95 mol % or less of a trans isomer relative to a total amount of a cis isomer and the trans isomer, and 0.

Abstract: 1,4-bis(isocyanatomethyl)cyclohexane contains 70 mol % or more and 95 mol % or less of a trans isomer relative to a total amount of a cis isomer and the trans isomer, and 0.

Abstract: Disclosed is a polymerizable composition for an optical material containing polyisocyanate (a) which is obtained from a plant-derived raw material and includes a modified product of aliphatic polyisocyanate, and polyol (d) which is a plant-derived compound.

Abstract: The eyewear material is an eyewear material containing thermoplastic polyurethane. The eyewear material has a tan ? peak at both less than 0° C. and 0° C. or more and 70° C. or less observed in dynamic viscoelasticity measurement in tensile mode under the measurement conditions of a temperature increase speed of 5° C./min and a measurement frequency of 10 Hz.

Abstract: Disclosed is a polymerizable composition for an optical material containing polyisocyanate (a) which is obtained from a plant-derived raw material and includes a modified product of aliphatic polyisocyanate, alicyclic polyisocyanate (b), and polyol (c) which has a hydroxyl value of 300 mgKOH/g to 650 mgKOH/g and the average number of functional groups of 2 or more and less than 7, and which is obtained from a plant-derived raw material.

Abstract: In a method for producing 1,5-pentamethylenediamine, a lysine decarboxylase-expressing microorganism that is subjected to a treatment is used.

Abstract: A Pentamethylene diisocyanate is obtained by phosgenating pentamethylenediamine or its salt obtained by a biochemical method, and contains 5 to 400 ppm of a compound represented by the general formula (1) below and a compound represented by the general formula (2) below in total:

Abstract: A Pentamethylene diisocyanate is obtained by phosgenating pentamethylenediamine or its salt obtained by a biochemical method, and contains 5 to 400 ppm of a compound represented by the general formula (1) below and a compound represented by the general formula (2) below in total:

Abstract: An oceanographic information collection system includes an anchor arranged on a sea bottom, an intermediate buoy connected to the anchor and floating in a sea, a mooring cable connected at one end to the intermediate buoy and at another end to an observation buoy. The observation buoy includes a main body whose longitudinal direction is arranged in a flowing direction of an ocean current. A specific gravity adjuster is arranged in the main body and includes an expandable and shrinkable buoyancy bag, an antenna arranged on the main body and transfers data, and an observation unit arranged in the main body and acquires prescribed oceanographic information. The observation buoy floats upward by expanding the buoyancy bag of the specific gravity adjuster, and sinks by shrinking the buoyancy bag in order to stand by in the sea. The buoy can easily float, sink and stand by in the sea.

Abstract: A Pentamethylene diisocyanate is obtained by phosgenating pentamethylenediamine or its salt obtained by a biochemical method, and contains 5 to 400 ppm of a compound represented by the general formula (1) below and a compound represented by the general formula (2) below in total:

Abstract: An underwater mobile body capable of acquiring information on hydrosphere and moving between a position under water and a water surface includes: a body unit provided with a data acquisition device that acquires hydrosphere information, and a specific gravity adjusting device that adjusts the position of the underwater mobile body under water; and an antenna unit arranged at a tail of the body unit and provided with an antenna that transmits the acquired hydrosphere information, wherein the antenna unit holds the antenna such that the antenna is able to turn in a vertical direction.