Tohoku University Patente

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A drive device 10 includes a center pulley 12 that is rotatable about a center axis X, a motor 14, a spiral spring 16 serving as an energy storage part, an output part 18, and a lock mechanism 20. A first end 16A of the spiral spring 16 is fixed to the center pulley 12. Rotation of the center pulley 12 by the motor 14 in a first direction causes the spiral spring 16 to extend and store energy. When the stored energy is released, the spiral spring 16 contracts and moves around the center axis X such that a second end 16B approaches the first end 16A. The output part 18 rotates in association with the movement of the spiral spring 16. The lock mechanism 20 is switchable between a lock state that restricts movement of the spiral spring 16 and a lock release state that allows the spiral spring 16 to move freely.

The problem to be solved by the present invention is to provide a novel mitochondrial-function-improving agent. The present invention provides a mitochondrial-function-improving agent comprising lactic acid bacteria capable of suppressing the production of reactive oxygen species in mitochondria.

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With the aim of providing a method for decomposing crosslinked rubber capable of improving the yield of C4-C10 chemicals, a method for decomposing crosslinked rubber includes: a first decomposition step of decomposing crosslinked rubber containing diene rubber using a catalyst represented by any one of the following formulae (1) to (3) (in the formulae, M is ruthenium, molybdenum, etc.; X<1>, X<2>, L<1>, L<2>, and L<3> each independently represent a ligand; R<1>, R<2>, and R<3> each independently represent hydrogen, an alkyl group, an alkenyl group, an aryl group, etc. (these groups may be substituted with one or more alkyl groups, halogens, etc.); L<1> and L<2>, R<1> and R<2>, as well as L<1> and R<1> may be bonded to each other to form a ring); and a second decomposition step of heating a decomposition product obtained in the first decomposition step in the presence of a catalyst at a heating rate of 800°C/min or more from 100°C to 450°C, and performing thermal decomposition at 450°C to 950°C. <img class="EMIRef" id="703bc77b-d29f-4061-bd84-24cae146b248-ia01" /> <img class="EMIRef" id="703bc77b-d29f-4061-bd84-24cae146b248-ia02" /> <img class="EMIRef" id="703bc77b-d29f-4061-bd84-24cae146b248-ia03" />

With the aim of providing a method for decomposing crosslinked rubber capable of improving the yield of C4-C10 chemicals, a method for decomposing crosslinked rubber includes: a first decomposition step of decomposing crosslinked rubber containing diene rubber using a catalyst represented by any one of the following formulae (1) to (3) (in the formulae, M is ruthenium, molybdenum, etc.; X¹, X², L¹, L², and L³ each independently represent a ligand; R¹, R², and R³ each independently represent hydrogen, an alkyl group, an alkenyl group, an aryl group, etc. (these groups may be substituted with an alkyl group, halogen, etc.); L¹ and L², R¹ and R², as well as L¹ and R¹ may be bonded to each other to form a ring); and a second decomposition step of heating a decomposition product obtained in the first decomposition step under an inert gas atmosphere and in the absence of a catalyst, at a heating rate of 800°C/min or more from 100°C to 450°C, and performing thermal decomposition at 450°C to 950°C.

With the aim of providing a method for decomposing an organic material capable of yielding C4-C10 chemicals, particularly diene-based monomers, at a high yield, a method for decomposing an organic material includes heating an organic material selected from crosslinked rubber containing diene rubber, uncrosslinked rubber containing diene rubber, and a diene-based liquid polymer under an inert gas atmosphere, at a heating rate of 800°C/min or more, and preferably 2000°C/min or more, from 100°C to 450°C, and performing thermal decomposition at 450°C to 950°C, or at a heating rate of 800°C/min or more, and preferably 2000°C/min or more, from 100°C to 600°C, and performing thermal decomposition at 650°C to 950°C.

With the aim of providing a method for decomposing crosslinked rubber capable of yielding a diene-based monomer at a high yield, a method for decomposing crosslinked rubber includes a first decomposition step of decomposing crosslinked rubber containing diene rubber in a solvent, and a second decomposition step of thermally decomposing a decomposition product obtained in the first decomposition step at 600°C to 950°C under an inert gas atmosphere and in the absence of a catalyst. The solvent in the first decomposition step is preferably at least one selected from the group consisting of toluene, xylene, cyclohexane, and butyl acetate.

To address a problem of providing a liquid polymer that is obtained by decomposition of crosslinked rubber and enables a diene monomer to be obtained at a high yield, a solution is a liquid polymer obtained by decomposition of crosslinked rubber containing diene rubber, wherein the liquid polymer has a weight-average molecular weight of 500 to 300,000, and relative to mass of a diene monomer skeleton of the diene rubber in the crosslinked rubber before the decomposition, the liquid polymer has a retention rate of the diene monomer skeleton of 30 mass% or more. It is preferable that the diene monomer skeleton of the diene rubber is at least one selected from the group consisting of an isoprene skeleton and a butadiene skeleton.

To address a problem of providing recovered carbon black capable of maintaining the physical properties of a rubber composition even when reused in the rubber composition, and also providing a mixture of such recovered carbon black and a liquid polymer, a solution is: recovered carbon black obtained by decomposition of crosslinked rubber containing diene rubber and carbon black, wherein a proportion of aggregates having a diameter of 5 µm or more, as determined using a particle size analyzer in a state where the recovered carbon black is dispersed ultrasonically in toluene solvent, is 50 vol% or less; and a mixture of such recovered carbon black and a liquid polymer, wherein the liquid polymer has a weight-average molecular weight of 300,000 or less.

To address a problem of providing recovered carbon black capable of maintaining the physical properties of a rubber composition even when reused in the rubber composition, and also providing a mixture of such recovered carbon black and a liquid polymer, a solution is: recovered carbon black obtained by decomposition of crosslinked rubber containing diene rubber and carbon black, wherein the recovered carbon black has a dispersion stability in toluene of 0.5 or more; and a mixture of such recovered carbon black and a liquid polymer, wherein the liquid polymer has a weight-average molecular weight of 300,000 or less.

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To address a problem of providing recovered carbon black capable of maintaining the physical properties of a rubber composition even when reused in the rubber composition, and also providing a mixture of such recovered carbon black and a liquid polymer, a solution is: recovered carbon black obtained by decomposition of crosslinked rubber containing diene rubber and carbon black, wherein an organic component remaining in the recovered carbon black after toluene washing is 5 mass% or more; and a mixture of such recovered carbon black and a liquid polymer, wherein the liquid polymer has a weight-average molecular weight of 300,000 or less.

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