Bridgestone Patente

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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.

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.

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 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.

With the aim of providing an efficient decomposition method for vulcanized rubber, a decomposition method for vulcanized rubber includes a first decomposition step of causing a radical initiator to act on vulcanized rubber or a composition containing the vulcanized rubber under an atmosphere containing oxygen gas to thereby cause conversion into a soluble decomposition product, and a second decomposition step of converting the soluble decomposition product obtained in the first decomposition step into a low molecular weight compound having 10 or fewer carbon atoms through thermal decomposition.

With the aim of providing an efficient decomposition method for vulcanized rubber, a decomposition method for vulcanized rubber includes causing a radical initiator selected from peroxides to act on vulcanized rubber or a composition containing the vulcanized rubber at 0°C to 60°C in a solvent, under an atmosphere containing oxygen gas, to thereby cause conversion into a soluble decomposition product.

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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.

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 300°C to 950°C under an inert gas atmosphere and in the presence 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.

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 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 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" />

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With the aim of providing a rubber composition that is capable of increasing the ratio of sustainable materials in rubber products and also improving elongation at break (EB) after thermal aging, a rubber composition contains a rubber component (A), recovered carbon black (B), at least two types of antioxidants (C), and zinc oxide (D), wherein a mass ratio "recovered carbon black (B)/zinc oxide (D)" of the recovered carbon black (B) to the zinc oxide (D) is more than 0 and not more than 5.0.