Conjugated diene-based polymer composition and tires

Abstract

Conjugated diene-based polymer composition comprising: 20 to 99 parts by mass of rubber component (A), which is a conjugated diene-based polymer having a glass transition temperature of -35°C or more and -10°C or less; 1 to 90 parts by mass of rubber component (B) having a glass transition temperature of -50°C or less and -100°C or more; and an inorganic silicon dioxide-based filler in an amount of 0.5 to 300 parts by mass in relation to 100 parts by mass of the total amount of rubber component (A) and rubber component (B), wherein the rubber component (A) comprises a conjugated diene-based polymer (A1) comprising an aromatic vinyl compound and a conjugated diene-based compound.the conjugated diene-based polymer (A1) has an absolute molecular weight of 40 × 10⁴ or more and 5000 × 10⁴ or less, determined by a GPC light scattering method with a viscosity detector, and a degree of branching (Bn) of 8 or more, determined by a GPC light scattering method with a viscosity detector; the conjugated diene-based polymer (A1) is a conjugated diene-based polymer with a three- or more-branched star-shaped high-molecular-weight structure; at least one branched chain of the star-shaped structure has a portion derived from a vinyl-based monomer comprising an alkoxysilyl group or a halosilyl group; and the portion derived from the vinyl-based monomer comprising the alkoxysilyl group or the halosilyl group has a further branched main-chain structure; and the portion of the conjugated diene-based polymer (A1),which is derived from the vinyl-based monomer comprising the alkoxysilyl group or the halosilyl group, is a monomer unit based on a compound represented by formula (1) or (2) below, wherein the conjugated diene-based polymer has a branch point of a high molecular weight chain through the monomer unit based on the compound represented by formula (1) or (2) below, wherein at least one end of the conjugated diene-based polymer (A1) is coupled using a coupling agent, wherein in formula (1) R1 denotes a hydrogen atom or an alkyl group with 1 to 20 carbon atoms or an aryl group with 6 to 20 carbon atoms and may have a branched structure at part of it,R2 to R3 independently indicate an alkyl group with 1 to 20 carbon atoms or an aryl group with 6 to 20 carbon atoms and may have a branched structure on some of them; R1 to R3 are independent of each other if a plurality of them are present; X1 represents an independent halogen atom; m indicates an integer from 0 to 2, n indicates an integer from 0 to 3, and l indicates an integer from 0 to 3, where (m + n + l) represents 3; in formula (2), R2 to R5 independently indicate an alkyl group with 1 to 20 carbon atoms or an aryl group with 6 to 20 carbon atoms and may have a branched structure on some of them; R2 to R5 are independent of each other if a plurality of them are present; X2 to X3 represent independent halogen atoms; m indicates an integer from 0 to 2, n indicates an integer from 0 to 3, and l indicates an integer displays from 0 to 3, where (m + n + l) displays 3,a displays an integer from 0 to 2, b displays an integer from 0 to 3, and c displays an integer from 0 to 3, where (a + b + c) displays 3.

Description

[Technical field] The present invention relates to a conjugated diene-based polymer composition and a vulcanized product, in particular a tire. [Background technology] In recent years, winter tires have been required to improve not only their driving performance on snow-covered roads (performance in snow) but also their driving performance on wet road surfaces (performance in wet conditions). Due to societal demands to reduce environmental pollution on Earth, the need for longer tire lifespans is also increasing, and improvements in tire performance and wear resistance are in high demand. With the aim of improving performance in snow by reducing the modulus of elasticity at low temperatures and ensuring high grip of a tread rubber on a snowy road surface, methods such as reducing the amount of filler added to a rubber composition and increasing the amount of oil added are proposed. However, such methods have the problem that they tend to cause a reduction in wet performance and wear resistance. In contrast, to improve performance in wet conditions, methods are proposed to increase energy loss by increasing the glass transition temperature of the rubber composition or by increasing the amount of added filler. However, these methods have the problem that they tend to increase the modulus of elasticity at low temperatures and decrease performance in snow. Especially in recent years, as road surface conditions in winter have become increasingly regulated, it has become ever more important for winter tires to improve their performance not only on snow-covered roads but also on wet road surfaces. Traditionally, rubber compositions are proposed in which the performance is improved in both snow and wet conditions by mixing rubbers with different glass transition temperatures (see, for example, patent disclosure JP 2005-154473 A). US 2018 / 0066076 A1 discloses a rubber composition comprising a polymer based on conjugated diene with a glass transition temperature of -45°C to -15°C and a rubber polymer as well as a silicon dioxide-based filler. EP 3862371 A1 and EP 4026704 A1 disclose compositions containing a rubber component and a polymer based on conjugated diene. [Overview of the invention] [Problem to be solved by the invention] However, the rubber composition specified in patent disclosure JP 2005-154473 A has a problem in that the reactivity between modifying groups of a terminally modified styrene-butadiene rubber and silicon dioxide is insufficient, and there is room for further improvement of performance in both snow and wet conditions. Therefore, the present invention aims to provide a conjugated diene-based polymer composition which exhibits good dispersibility of silicon dioxide as a filler, and from which a rubber composition with a highly developed balance between performance in snow and performance in wet conditions is obtained. [Means of solving the problem] As a result of intensive studies to solve the aforementioned problems of the prior art, the inventors of the present invention have found that a conjugated diene-based polymer composition comprising two types of rubber components A and rubber components B with different glass transition temperatures, wherein a conjugated diene-based copolymer (A1) is included, wherein an absolute molecular weight of the rubber component A is in a predetermined range and a degree of branching (Bn) is in a specified range, yields a rubber composition with a highly developed balance between performance in snow and performance in wet conditions, and has thus arrived at the present invention. That is, the present invention is described in the patent claims. [Effects of the invention] According to the present invention, a conjugated diene-based polymer composition can be provided from which a rubber composition is obtained that exhibits a high degree of equilibrium between performance in snow and performance in wet conditions. [Emphasis of the invention] One embodiment of the invention (hereinafter referred to as the "present embodiment") will be explained in more detail below. The following embodiment is an example to illustrate the present invention, and the present invention is not limited to the following embodiment. The present invention can be modified and implemented to the extent of its essential content as required by the circumstances. [Conjugated diene-based polymer composition] The conjugated diene-based polymer composition of the present embodiment comprises: 20 to 99 parts by mass of a rubber component (A) that is a conjugated diene-based polymer having a glass transition temperature of -35°C or more and -10°C or less, and 1 to 90 parts by mass of a rubber component (B) having a glass transition temperature of -50°C or less and -100°C or more. The rubber component (A) comprises the conjugated diene-based polymer (A1) which contains an aromatic vinyl compound and a conjugated diene compound, wherein the conjugated diene-based polymer (A1) has an absolute molecular weight of 40 × 104 or more and 5000 × 104 or less, as determined by a GPC light scattering method with a viscosity detector, and a degree of branching (Bn) of 8 or more, as determined by a GPC light scattering method with a viscosity detector. According to the conjugated diene-based polymer composition of the present embodiment, the rubber composition is obtained which is highly distinguished in the balance between performance in snow and performance in wet conditions. (Rubber component (A)) The rubber component (A) included in the conjugated diene-based polymer composition of the present embodiment has a glass transition temperature of -35°C or more and -10°C or less and comprises a conjugated diene-based polymer (A1) which will be described later. The conjugated diene-based polymer (A1) has an absolute molecular weight of 40 × 104 or more and 5000 × 104 or less, as determined by GPC light scattering method measurement with a viscosity detector, and a degree of branching (Bn) of 8 or more, as determined by GPC light scattering method measurement with a viscosity detector, and comprises the aromatic vinyl compound and the conjugated diene compound. The conjugated diene-based polymer (A1) may also include components other than the aromatic vinyl compound and the conjugated diene compound; however, the aromatic vinyl compound and the conjugated diene compound are the main components, with the proportion of these components preferably being 90 wt% or more and more preferably 95 wt% or more. As a rubber component for tire treads, it is common for this rubber component to comprise no other components than the aromatic vinyl compound and the conjugated diene compound. Furthermore, from the point of view of improving wear resistance, the rubber component (A) preferably comprises 20 wt% or more of the conjugated diene-based polymer (A1) based on the total mass of the rubber component (A), more preferably 40 wt% or more, and even more preferably 60 wt% or more. <Glasübergangstemperatur von Kautschukkomponenten (A)> The glass transition temperature of the rubber component (A) is -35°C or higher and -10°C or lower, as stated above. The glass transition temperature can be controlled by adjusting the microstructure of the conjugated diene-based polymer (A1), specifically by controlling the amount of aromatic vinyl compound and the amount of vinyl in the conjugated diene-based polymer (A1) within the numerical range mentioned above. Specifically, the glass transition temperature can be improved by increasing the amount of aromatic vinyl compound or by increasing the amount of vinyl compound in the conjugated diene-based polymer. Regarding the method for setting the glass transition temperature of the rubber component (A) to -35°C or higher, the glass transition temperature can be brought into the above range by, for example, setting the amount of aromatic vinyl to 20 to 45 wt% and the amount of vinyl compound in the conjugated diene-based polymer compound to 10 to 70 wt%. When the glass transition temperature is within the above range, wet performance tends to improve even further. Regarding the glass transition temperature, the DSC curve is recorded according to ISO 22768:2006 while the temperature is increased within a predetermined temperature range, with the inflection point of the DSC derivative curve being considered the glass transition temperature. Specifically, the measurement can be carried out using the method described in the embodiments outlined later. The upper limit of the glass transition temperature of the rubber component (A) is -10°C or less. In this range, performance in snow tends to improve even further. The conjugated diene-based polymer (A1) included in the rubber component (A) is explained below. (Conjugated diene-based polymer (A1)) <Absolutes Molekulargewicht> The rubber component (A) comprises a conjugated diene-based polymer (A1) which includes an aromatic vinyl compound and a conjugated diene compound, wherein the conjugated diene-based polymer (A1) exhibits, from the point of view of wear resistance and fracture properties, an absolute molecular weight value of 40 × 104 or more and 5000 × 104 or less as measured by GPC light scattering method with a viscosity detector. In general, polymers with a branched structure tend to have a smaller molecular size compared to linear polymers of the same molecular weight. Therefore, the molecular weight of polymers with a branched structure tends to be underestimated in the reduced molecular weight of polystyrene, which is determined by gel permeation chromatography (GPC), a relative comparison method to standard polystyrene samples. In contrast, the absolute molecular weight measured using a GPC light scattering method with a viscosity detector is not influenced by the structure of the high-molecular-weight polymer or its interaction with a column filler, unlike the reduced molecular weight in polystyrene determined by gel permeation chromatography (GPC). This is because the molecule size is directly observed using the light scattering method, and the molecular weight (absolute molecular weight) is measured. Therefore, the molecular weight can be accurately measured without being affected by the polymer structure, such as the branching structure of the conjugated diene-based polymer. The absolute molecular weight of the conjugated diene-based polymer (A1) is 40 × 104 or more, preferably 50 × 104 or more, more preferably 60 × 104 or more, more preferably 80 × 104 or more, and more preferably 100 × 104 or more. The absolute molecular weight of the conjugated diene-based polymer (A1) is also 5000 × 104 or less, preferably 4500 × 104 or less, more preferably 4000 × 104 or less, even more preferably 3500 × 104 or less and still more preferably 3000 × 104 or less. An absolute molecular weight of 40 × 10⁴ or higher results in excellent wear resistance when processed into a vulcanizate. An absolute molecular weight of 5000 × 10⁴ or lower also results in excellent processability and filler dispersibility when processed into a vulcanizate, as well as excellent wet performance. The absolute molecular weight of the conjugated diene-based polymer (A1) can be measured using the method described in the embodiments described later. The absolute molecular weight of the conjugated diene-based polymer (A1) can also be controlled by adjusting the amount of polymerization initiator, the number of functional groups of a branching agent, the amount of branching agent added, the timing of branching agent addition, the amount of coupling agent added, and a modifier within the above numerical range. <verzweigungsgrad> The conjugated diene-based polymer (A1) exhibits a degree of branching (Bn) of 8 or more with regard to processability and wet performance. A degree of branching (Bn) of 8 or more means that the conjugated diene-based polymer (A1) has eight or more high molecular weight side chains for the essentially longest high molecular weight main chain. The degree of branching (Bn) of the conjugated diene-based polymer (A1) is defined as g' = 6Bn / {(Bn + 1)(Bn + 2)} using a contraction factor (g') measured by a GPC light scattering method with a viscosity detector. In general, polymers with branches tend to have a smaller molecular size compared to linear polymers with the same absolute molecular weight. The contraction factor (g') is an indicator of the ratio of the molecule's size to that of a linear polymer with the same absolute molecular weight. That is, the greater the degree of branching of the polymer, the smaller the contraction factor (g') tends to be. For this contraction factor, the intrinsic viscosity is used in the present embodiment as an indicator of the molecular size, and the linear polymers are subject to the relationship of intrinsic viscosity [η] = -3.883M0.771. In the equation, M is the absolute molecular weight. However, the contraction factor (g') expresses the rate of decrease in molecule size and not exactly the branching structure of the polymer. Therefore, the degree of branching (Bn) of the conjugated diene-based polymer (A1) is calculated using the value of the contraction factor (g') at each absolute molecular weight of the conjugated diene-based polymer (A1). The calculated "degree of branching (Bn)" is an exact expression of the number of polymers directly or indirectly linked to each other for the longest main chain structure. The calculated degree of branching (Bn) is an indicator for expressing the branching structure of the conjugated diene-based polymer (A1). For example, in the case of a general 4-branched star-shaped high molecule (four polymer chains are connected to the central part), two high-molecular-weight chain arms are connected for the longest highly branched main chain structure, where the degree of branching (Bn) is rated as 2. In the case of a general 8-branched star-shaped high molecule, six high-molecular-weight chain arms are linked to form the longest highly branched main chain structure, with the degree of branching (Bn) being rated as 6. Although the conjugated diene-based polymer (A1) has a branching degree (Bn) of 8 or more, in such cases this means that it is a conjugated diene-based polymer that has the same branching as a 10-branched star-shaped high molecular weight structure. In this process, "branching" is formed by the direct or indirect bonding of one polymer to another. The "degree of branching (Bn)" is also the number of polymers directly or indirectly bonded to each other for the longest main chain structure. Due to the degree of branching (Bn) being 8 or more, the conjugated diene-based polymer (A1) is distinguished in processability and wet performance when processed into a vulcanizate. In general, processability tends to deteriorate with increasing absolute molecular weight. When the absolute molecular weight is increased in the linear high-molecular-weight structure, the viscosity of the vulcanizate rises considerably, and processability deteriorates significantly. Therefore, even if a variety of functional groups are introduced into the polymer to improve its affinity and / or reactivity with the silicon dioxide mixed in as a filler, the silicon dioxide may not be sufficiently dispersed in the polymer during the kneading step. As a result, the function of the introduced functional group is not realized, and the expected improvement in wet performance from the introduction of a functional group is not achieved. In contrast, specifying that the degree of branching (Bn) in the conjugated diene-based polymer (A1) is 8 or higher significantly suppresses the viscosity increase of the vulcanizate caused by the increase in absolute molecular weight. This ensures that the polymer mixes sufficiently with silicon dioxide and the like during the kneading step, and that the silicon dioxide can be dispersed around the conjugated diene-based polymer (A1). Consequently, specifying a high molecular weight for the conjugated diene-based polymer (A1) allows for improved wear resistance and enables sufficient wet performance for practical applications. This is achieved by dispersing the silicon dioxide around the polymer through adequate kneading, allowing the functional groups to act and / or react. The absolute molecular weight of the conjugated diene-based polymer (A1) can be measured using the method described in the embodiments described later. The degree of branching (Bn) of the conjugated diene-based polymer (A1) is 8 or more, preferably 10 or more, more preferably 12 or more and more preferably 15 or more. A conjugated diene-based polymer (A1) with a degree of branching (Bn) in this range tends to exhibit good processability when processed into a vulcanizate. Furthermore, the upper limit of the degree of branching (Bn) is not particularly restricted and may be equal to or above the detection limit, but is preferably 84 or less, more preferably 80 or less, even more preferably 64 or less and still more preferably 57 or less. A value of 84 or less tends to indicate excellent wear resistance when processed into a vulcanizate. The degree of branching of the conjugated diene-based polymer (A1) can be controlled to 8 or more by a combination of the amount of branching agent added and the amount of terminal modifier added. Specifically, the degree of branching can be controlled by adjusting the number of functional groups of the branching agent, the amount of branching agent added, the timing of branching agent addition, and the amount of modifier added. This will be shown in more detail in the following section [Manufacturing Process of Conjugated Diene-Based Polymer]. <modifizierungsgrad> From the perspective of improving fuel-saving performance, the degree of modification of the conjugated diene-based polymer (A1) in relation to the total amount of the conjugated diene-based polymer is preferably 60 wt% or more. In the present description, the term “degree of modification” represents the mass ratio of the conjugated diene-based polymer with a nitrogen-containing functional group to the total amount of the conjugated diene-based polymer. For example, if a nitrogen-containing modifier has been reacted at the terminal end, the mass ratio of the conjugated diene-based polymer with a nitrogen-containing functional group through the nitrogen-containing modifier to the total amount of the conjugated diene-based polymer is expressed as the degree of modification. In contrast, if the polymer has been branched by a nitrogen-containing branching agent, the branched polymer is also counted when calculating the degree of modification, since the resulting conjugated diene-based polymer has a nitrogen-containing functional group. That is, if the conjugated diene-based polymer in the present description is in particular a “modified conjugated diene-based polymer”, the mass ratio of the sum of the coupling polymer by the modifier with a nitrogen-containing functional group and / or of the branched polymer by the branching agent with a nitrogen-containing functional group represents the degree of modification. The degree of modification of the conjugated diene-based polymer (A1) is preferably 65 wt% or more, more preferably 70 wt% or more, more preferably 75 wt% or more, more preferably 80 wt% or more and more preferably 82 wt% or more. A modification rate of 60% by mass or more tends to be superior to excellent fuel-saving performance when processed into a vulcanizate. Unless otherwise specified in this description, the term “conjugated diene-based polymer” also includes a modified (containing functional groups) conjugated diene-based polymer. The degree of modification can be measured by chromatography, which can separate modified components containing functional groups from unmodified components. A method using this chromatography is described as a method for quantification using a column for gel permeation chromatography by means of a polar substance such as silicon dioxide, which adsorbs a specific functional group, as a filler and using the internal standard of the non-adsorbing component for comparison. More specifically, the degree of modification is obtained by measuring the adsorption capacity of the silica column from the difference between the chromatogram obtained when the sample solution containing the sample and the internal standard low molecular weight polystyrene was measured using a polystyrene gel column and the chromatogram obtained using a silica column. The degree of modification can be measured even more precisely using the method described in the exemplary embodiments. In the conjugated diene-based polymer (A1), the degree of modification can be controlled by adjusting the amount of modifier added and the reaction procedure, and can thereby be controlled to 60 wt% or more. For example, the above degree of modification can be achieved by combining a polymerization process using an organolithium compound with at least one nitrogen atom in the molecule as a polymerization initiator, as described later, a process for copolymerizing a monomer with at least one nitrogen atom in the molecule, and a process using a modifier with the structural formula described later, and by controlling the polymerization conditions. <Struktur von konjugiertem Dien-basiertem Polymer (A1)> The conjugated diene-based polymer (A1) is, from the point of view of a balance between processability and wear resistance, a conjugated diene-based polymer with a triple or more branched star-shaped high molecular weight structure, with a part derived from a vinyl monomer comprising an alkoxysilyl group or a halosilyl group in at least one branched chain of the star-shaped structure, and with a further branched main chain structure in the part derived from the vinyl monomer comprising the alkoxysilyl group or the halosilyl group. The term “star-shaped high-molecular-weight structure” in the present description means a structure in which a large number of high-molecular-weight chains (arms) are bound from a central branching point. The one central branching point also features a “substituent containing an atom derived from a coupling agent” or a “substituent containing a nitrogen atom derived from a modifier”. The “branched main chain structure” in the present description means a structure in which the high molecular weight chain forms a branch point at a part derived from the vinyl monomer comprising the alkoxysilyl group or the halosilyl group, and furthermore the high molecular weight chain (arm) extends from the branch point. The conjugated diene-based polymer (A1) preferably has four or more main chain branching points, derived from a vinyl monomer comprising an alkoxysilyl group or a halosilyl group, with the branching structure derived from the star-shaped high molecular weight structure formed in the reaction step by the modifier preferably having three or more branches, more preferably four or more branches, and even more preferably eight or more branches. Although the number of Bn branches increases both in the case of modification by a coupling agent leading to a star-shaped structure and in the case of the introduction of a branching agent into the polymer, the contribution to the number of Bn branches is greater when the entire high molecular weight chain is branched by the coupling agent. When designing the polymer, the number of Bn branches can be controlled by choosing the coupling agent and selecting the type and adjusting the amount of the branching agent; however, controlling the number of Bn branches is easier by also taking the contribution rate into account. <hauptkettenverzweigungsstruktur> In the aforementioned main chain branching structure, the portion derived from the vinyl monomer comprising the alkoxysilyl group or the halosilyl group has two or more branching points, preferably three or more branching points, and more preferably four or more branching points. Furthermore, the branching points that form the main chain branching structure preferably have at least two or more high molecular weight chains, more preferably three or more high molecular weight chains that are not main chains, and even more preferably four or more high molecular weight chains that are not main chains. In particular, in the main chain branching structure comprising a vinyl monomer with an alkoxysilyl group or a halosilyl group, a main chain branching peak is detected in the range of -45 ppm to -65 ppm, and furthermore to a more limited extent, in the range of -50 ppm to -60 ppm, when the signal is detected by 29Si-NMR. <Sternförmige hochmolekulare Struktur> The conjugated diene-based polymer (A1) has a star-shaped high molecular weight structure and has three or more branches derived from the star-shaped high molecular weight structure, more preferably four or more branches, more preferably six or more branches, and more preferably eight or more branches. With regard to a process for obtaining the conjugated diene-based polymer (A1) with a star-shaped polymer structure having three or more branches, wherein at least one branching chain of the star-shaped structure has a part derived from the vinyl monomer containing an alkoxysilyl group or a halosilyl group, and the part derived from the vinyl monomer containing the alkoxysilyl group or the halosilyl group has another main-chain branching structure, the “star-shaped high-molecular-weight structure” can be formed by adjusting the number of functional groups of the modifier and the amount added by the modifier, wherein the “main-chain branching structure” can be controlled by adjusting the number of functional groups of the branching agent, the amount added by the branching agent, and the timing of the addition of the branching agent. To obtain a conjugated diene-based polymer with a star-shaped high-molecular-weight structure with three or more branches, which in at least one branched chain of the star-shaped structure has a part derived from the vinyl monomer comprising an alkoxysilyl group or a halosilyl group, and on the part derived from the vinyl monomer comprising the alkoxysilyl group or the halosilyl group has another branched main-chain structure, for example, a process is cited in which an organolithium compound is used as a polymerization initiator and the polymerization is carried out, during or after the polymerization a branching agent which further provides a specific branching point is added and the polymerization is continued, and then the modification with a modifier which provides a specific branching rate is carried out. The control mechanism under such polymerization conditions is specified in the manufacturing process in the embodiments described later. <Detaillierte Struktur von Hauptkettenverzweigungsstruktur> The conjugated diene-based polymer (A1) is a conjugated diene-based polymer in which a portion derived from the vinyl monomer comprising the alkoxysilyl group or the halosilyl group is a monomer unit based on a compound represented by formula (1) or (2) below, wherein the conjugated diene-based polymer has a branch point of a high molecular weight chain through the monomer unit based on a compound represented by formula (1) or (2) below, and at least one end of the conjugated diene-based polymer is coupled using a coupling agent, wherein at least one end of the conjugated diene-based polymer is more preferably modified with a nitrogen-containing group. (In formula (1) R1 shows a hydrogen atom or an alkyl group with 1 to 20 carbon atoms or an aryl group with 6 to 20 carbon atoms and may have a branched structure on part of it. R2-R3 independently exhibit an alkyl group with 1 to 20 carbon atoms or an aryl group with 6 to 20 carbon atoms and may have a branched structure in some of them. R1-R3 are independent of each other if multiples are present. X1 represents an independent halogen atom. m represents an integer from 0 to 2, n represents an integer from 0 to 3, and l represents an integer from 0 to 3. (m + n + l) represents 3.) (In formula (2), R2-R5 independently exhibit an alkyl group with 1 to 20 carbon atoms or an aryl group with 6 to 20 carbon atoms and may have a branched structure on some of them. R2-R5s are independent of each other if a plurality of them are present.) X2-X3 represent independent halogen atoms. m represents an integer from 0 to 2, n represents an integer from 0 to 3, and l represents an integer from 0 to 3. (m + n + l) represents 3. a represents an integer from 0 to 2, b represents an integer from 0 to 3, and c represents an integer from 0 to 3. (a + b + c) represents an integer of 3.) The conjugated diene-based polymer (A1) preferably has a monomer unit based on the compound represented by formula (1), where R1 of the above formula (1) is a hydrogen atom and m = 0. This improves the number of branches and results in improved wear resistance and processability. Furthermore, the conjugated diene-based polymer (A1) preferentially has a monomer unit based on the compound represented by formula (2), where in formula (2) m = 0 and b = 0. This results in an improvement in wear resistance and processability. Furthermore, the conjugated diene-based polymer (A1) preferably has a monomer unit based on the compound represented by formula (1), where R1 of the above formula (1) is a hydrogen atom and m = 0 and 1 = 0. This improves the branching rate and results in improved wear resistance and processability. Furthermore, the conjugated diene-based polymer (A1) is preferably a conjugated diene-based polymer with a monomer unit based on the compound represented by formula (2), where in formula (2) m = 0, 1 = 0, a = 0 and b = 0. This results in an improvement in wear resistance and processability. Furthermore, the conjugated diene-based polymer (A1) is preferably a conjugated diene-based polymer with a monomer unit based on the compound represented by formula (1), where in formula (1) R1 is a hydrogen atom and l = 0 and n = 3. This improves the degree of modification and branching, resulting in improved fuel-saving performance, wear resistance, and processability. (branching agent) In the conjugated diene-based polymer (A1), a branching agent is preferably used as the branching agent in the construction of the main chain branching structure, which is represented by the following formula (1) or formula (2). (In formula (1) R1 shows a hydrogen atom or an alkyl group with 1 to 20 carbon atoms or an aryl group with 6 to 20 carbon atoms and may have a branched structure on part of it. R2-R3 independently exhibit an alkyl group with 1 to 20 carbon atoms or an aryl group with 6-20 carbon atoms and may have a branched structure on some of them. R1-R3 are independent of each other if there are multiples of them. X1 represents an independent halogen atom. m represents an integer from 0 to 2, n represents an integer from 0 to 3, and l represents an integer from 0 to 3. (m + n + l) represents 3.) (In formula (2) R2-R5 independently show an alkyl group with 1 to 20 carbon atoms or an aryl group with 6-20 carbon atoms and may have a branched structure on some of them. R2-R5 are independent of each other if a plurality of them are present. X2-X3 represent independent halogen atoms. m represents an integer from 0 to 2, n represents an integer from 0 to 3, and l represents an integer from 0 to 3. (m + n + l) represents 3. a represents an integer from 0 to 2, b represents an integer from 0 to 3, and c represents an integer from 0 to 3. (a + b + c) represents 3.) The branching agent used in the construction of the main chain branching structure of the conjugated diene-based polymer (A1) is preferably, from the point of view of continuity of polymerization and improvement of the degree of branching, a compound wherein R1 of formula (1) is a hydrogen atom and m = 0. Furthermore, the branching agent used in the construction of the main chain branching structure of the conjugated diene-based polymer (A1) is preferably a compound in which m = 0 and b = 0 in formula (2) from the point of view of improving the degree of branching. Furthermore, the branching agent used in the construction of the main chain branching structure of the conjugated diene-based polymer (A1) is more preferably, from the point of view of continuity of polymerization as well as improvement of the degree of modification and the degree of branching, a compound wherein R1 of formula (1) is a hydrogen atom and m = 0 and l = 0. Furthermore, the branching agent used in the construction of the main chain branching structure of the conjugated diene-based polymer (A1) is, from the point of view of improving the degree of modification and the degree of branching, even more preferably a compound wherein in formula (2) m = 0, l = 0, a = 0, b = 0. Furthermore, the branching agent used in the construction of the main chain branching structure of the conjugated diene-based polymer (A1) is more preferably, from the point of view of continuity of polymerization as well as improvement of the degree of modification and the degree of branching, a compound wherein in formula (1) R1 is a hydrogen atom and 1 = 0 and n = 3. Als durch die Formel (1) dargestellte Verzweigungsmittel werden z. B. die folgenden angeführt, ohne darauf beschränkt zu sein: Trimethoxy(4-vinylphenyl)silan, Triethoxy(4-vinylphenyl)silan, Tripropoxy(4-vinylphenyl)silan, Tributoxy(4-vinylphenyl)silan, Triisopropoxy(4-vinylphenyl)silan, Trimethoxy (3-vinylphenyl)silan, Triethoxy(3-vinylphenyl)silan, Tripropoxy(3-vinylphenyl)silan, Tributoxy(3-vinylphenyl)silan, Triisopropoxy(3-vinylphenyl)silan, Trimethoxy(2-vinylphenyl)silan, Triethoxy(2-vinylphenyl)silan, tripropoxy(2-vinylphenyl)silan, Tributoxy(2-vinylphenyl) Silan, Triisopropoxy(2-vinylphenyl)silan, Dimethoxymethyl(4-vinylphenyl)silan, Diethoxymethyl(4-vinylphenyl)silan, Dipropoxymethyl(4-vinylphenyl)silan, Dibutoxymethyl(4-vinylphenyl)silan, Diisopropoxymethyl(4-vinylphenyl)silan, Dimethoxymethyl(3-vinylphenyl)silan, Diethoxymethyl(3-vinylphenyl)silan, Dipropoxymethyl(3-vinylphenyl)silan, Dibutoxymethyl(3-vinylphenyl)silan, Diisopropoxymethyl(3-vinylphenyl)silan,Dimethoxymethyl(2-vinylphenyl)silan, Diethoxymethyl(2-vinylphenyl)silan, Dipropoxymethyl(2-vinylphenyl)silan, Dibutoxymethyl(2-vinylphenyl)silan, Diisopropoxymethyl(2-vinylphenyl)silan, Dimethylmethoxy(4-vinylphenyl)silan, Dimethylethoxy(4-vinylphenyl)silan, Dimethylpropoxy(4-vinylphenyl)silan, Dimethylbutoxy(4-vinylphenyl)silan, Dimethylisopropoxy(4-vinylphenyl)silan, Dimethylmethoxy(3-vinylphenyl)silan, Dimethylethoxy(3-vinylphenyl)silan, Dimethylpropoxy(3-vinylphenyl)silan, Dimethylbutoxy(3-vinylphenyl)silan, Dimethylisopropoxy(3-vinylphenyl)silan, Dimethylmethoxy(2-vinylphenyl)silan, Dimethylethoxy(2-vinylphenyl)silan, Dimethylpropoxy(2-vinylphenyl)silan, Dimethylbutoxy(2-vinylphenyl)silan, Dimethylisopropoxy(2-vinylphenyl)silan, Trimethoxy(4-isopropenylphenyl)silan, Trietoxy(4-isopropenylphenyl)silan, Tripropoxy(4-isopropenylphenyl)silan, Tributoxy(4-isopropenylphenyl)silan, Triisopropoxy(4-isopropenylphenyl)silan, Trimethoxy(3-isopropenylphenyl)silan,Triethoxy(3-isopropenylphenyl)silan, Tripropoxy(3-isopropenylphenyl)silan, Tributoxy(3-isopropenylphenyl)silan, Triisopropoxy(3-isopropenylphenyl)silan, Trimethoxy(2-isopropenylphenyl)silan, Trietoxy(2-isopropenylphenyl)silan, Tripropoxy(2-isopropenylphenyl)silan, Tributoxy(2-isopropenylphenyl)silan, Triisopropoxy(2-isopropenylphenyl)silan, Dimethoxymethyl(4-isopropenylphenyl)silan, Diethoxymethyl(4-isopropenylphenyl)silan, Dipropoxymethyl(4-isopropenylphenyl)silan, Dibutoxymethyl(4-isopropenylphenyl)silan, Diisopropoxymethyl(4-isopropenylphenyl)silan, Dimethoxymethyl(3-isopropenylphenyl)silan, Diethoxymethyl(3-isopropenylphenyl)silan, Dipropoxymethyl(3-isopropenylphenyl)silan, Dibutoxymethyl(3-isopropenylphenyl)silan, Diisopropoxymethyl(3-isopropenylphenyl)silan, Dimethoxymethyl(2-isopropenylphenyl)silan, Diethoxymethyl(2-isopropenylphenyl)silan, Dipropoxymethyl(2-isopropenylphenyl)silan, Diprotoxymethyl(2-isopropenylphenyl)silan, Diisopropoxymethyl(2-isopropenylphenyl)silan,Dimethylmethoxy(4-isopropenylphenyl)silan, Dimethylethoxy(4-isopropenylphenyl)silan, Dimethylpropoxy(4-isopropenylphenyl)silan, Dimethylbutoxy(4-isopropenylphenyl)silan, Dimethylisopropoxy(4-isopropenylphenyl)silan, Dimethylmethoxy(3-isopropenylphenyl)silan, Dimethylethoxy(3-isopropenylphenyl)silan, Dimethylpropoxy(3-isopropenylphenyl)silan, Dimethylbutoxy(3-isopropenylphenyl)silan, Dimethylisopropoxy(3-isopropenylphenyl)silan, Dimethylmethoxy(2-isopropenylphenyl)silan, Dimethylethoxy(2-isopropenylphenyl)silan, Dimethylpropoxy(2-isopropenylphenyl)silan, Dimethylbutoxy(2-isopropenylphenyl)silan, Dimethylisopropoxy(2-isopropenylphenyl)silan, Trichloro(4-vinylphenyl)silan, Trichloro(3-vinylphenyl)silan, Trichloro(2-vinylphenyl)silan, Tribromo(4-vinylphenyl)silan, Tribromo(3-vinylphenyl)silan, Tribromo(2-vinylphenyl)silan, Dichlormethyl(4-vinylphenyl)silan, Dichlormethyl(3-vinylphenyl)silan, Dichlormethyl(2-vinylphenyl)silan, Dibrommethyl(4-vinylphenyl)silan,Dibrommethyl(3-vinylphenyl)silan, Dibrommethyl(2-vinylphenyl)silan, Dimethylchlor(4-vinylphenyl)silan, Dimethylchlor(3-vinylphenyl)silan, Dimethylchlor(2-vinylphenyl)silan, Dimethylbromo(4-vinylphenyl)silan, Dimethylbromo(3-vinylphenyl)silan und Dimethylbromo(2-vinylphenyl)silan., Unter diesen sind Trimethoxy(4-vinylphenyl)silan, Triethoxy(4-vinylphenyl)silan, tripropoxy(4-vinylphenyl)silan, Tributoxy(4-vinylphenyl)silan, Triisopropoxy(4-vinylphenyl)silan, Trimethoxy(3-vinylphenyl)silan, Triethoxy(3-vinylphenyl)silan, Tripropoxy(3-vinylphenyl)silan, Tributoxy(3-vinylphenyl)silan, Triisopropoxy(3-vinylphenyl)silan und Trichlor(4-vinylphenyl)silan bevorzugt und Trimethoxy(4-vinylphenyl)silan, Triethoxy(4-vinylphenyl)silan, Tripropoxy(4-vinylphenyl)silan, Tributoxy(4-vinylphenyl) silan, Triisopropoxy(4-vinylphenyl)silan mehr bevorzugt. The branching agents represented by formula (2) include, for example,The following are listed, but are not limited to: 1,1-bis(4-trimethoxysilylphenyl)ethylene, 1,1-bis(4-triethoxysilylphenyl)ethylene, 1,1-bis(4-tripropoxysilylphenyl)ethylene, 1,1-bis(4-tripentoxysilylphenyl)ethylene, 1,1-bis(4-triisopropoxysilylphenyl)ethylene, 1,1-bis(3-trimethoxysilylphenyl)ethylene, 1,1-bis(3-triethoxysilylphenyl)ethylene, 1,1-bis(3-tripropoxysilylphenyl)ethylene, 1,1-bis(3-triisopropoxysilylphenyl)ethylene, 1,1-bis(2-trimethoxysilylphenyl)ethylene, 1,1-bis(2-triethoxysilylphenyl)ethylene 1,1-bis(3-tripropoxysilylphenyl)ethylene, 1,1-bis(2-tripentoxysilylphenyl)ethylene, 1,1-bis(2-triisopropoxysilylphenyl)ethylene, 1,1-bis(4-(dimethylmethoxysilyl)phenyl)ethylene, 1,1-bis(4-(diethylmethoxysilyl)phenyl)ethylene, 1,1-bis(4-(dipropylmethoxysilyl)phenyl)ethylene, 1,1-bis(4-(dimethylethoxysilyl)phenyl)ethylene, 1,1-bis(4-(diethylethoxysilyl)phenyl)ethylene, 1,1-bis(4-(dipropylethoxysilyl)phenyl)ethylene. Among these, 1,1-bis(4-trimethoxysilylphenyl)ethylene, 1,1-bis(4-triethoxysilylphenyl)ethylene, 1,1-bis(4-tripropoxysilylphenyl)ethylene, 1,1-bis(4-tripentoxysilylphenyl)ethylene, and 1,1-bis(4-triisopropoxysilylphenyl)ethylene are preferred, and 1,1-bis(4-trimethoxysilylphenyl)ethylene is more preferred. [Manufacturing process of conjugated diene-based polymer (A1)] The manufacturing process of a conjugated diene-based polymer (A1) comprises: a polymerization / branching step in which, in the presence of an organolithium compound, at least one conjugated diene compound is polymerized to obtain a conjugated diene-based polymer with a main chain branching structure using at least one of the above-mentioned different branching agents, and a coupling step of the conjugated diene-based polymer using a coupling agent and / or a modification step of the conjugated diene-based polymer by means of a modifier having a nitrogen-containing group. The conjugated diene-based polymer that forms the modified conjugated diene-based polymer can be either a single polymer consisting of a single conjugated diene compound or a polymer consisting of different types of conjugated diene compounds, namely a copolymer or a copolymer consisting of a conjugated diene compound and an aromatic vinyl compound. (Polymerization / branching step) In the polymerization / branching step of the manufacturing process of a conjugated diene-based polymer (A1), an organolithium compound, e.g., an organomonolithium compound, is used as a polymerization initiator, and at least one conjugated diene compound is polymerized in order to obtain a conjugated diene-based polymer with a main chain branching structure by adding a branching agent. In the polymerization step, polymerization is preferably carried out via a growth reaction using a living anionic polymerization reaction, thereby yielding a conjugated diene-based polymer with an active end. There is a tendency to subsequently control the main-chain branching in the branching step using a branching agent, and to continue polymerization at the active end after main-chain branching, thus obtaining a modified conjugated diene-based polymer with a high degree of modification. <polymerisationsinitiator> An organolithium compound is used as the polymerization initiator, and it is preferred to use at least one organomonolithium compound. Examples of organomonolithium compounds include, but are not limited to, low molecular weight compounds and solubilized oligomeric organomonolithium compounds. Furthermore, organomonolithium compounds, in the bonding mode between the organic group and the lithium, include, for example, a compound with a carbon-lithium bond, a compound with a nitrogen-lithium bond, and a compound with a tin-lithium bond. The amount of organomonolithium compound used as a polymerization initiator is preferably determined depending on the molecular weight of the desired conjugated diene-based polymer. The amount of monomer or conjugated diene compound used in relation to the amount of polymerization initiator is related to the degree of polymerization of the desired conjugated diene-based polymer. That is, the relationship tends to be to the number-mean molecular weight and / or the weight-mean molecular weight. To increase the molecular weight of the conjugated diene-based polymer, the polymerization initiator should therefore be adjusted towards a decrease, and to reduce the molecular weight, the amount of polymerization initiator should be adjusted towards an increase. From the point of view that the organomonolithium compounds are used in a method for introducing a nitrogen atom into a conjugated diene-based polymer, preferably an alkyllithium compound with a substituted amino group or a dialkylaminolithium. In this case, a conjugated diene-based polymer is obtained, which at the end of the Polymerization initiation has a nitrogen atom from an amino group. The substituted amino group is an amino group that does not have an active hydrogen, or with a structure in which the active hydrogen is protected. Examples of alkyllithium compounds with an amino group that does not have an active hydrogen include, but are not limited to: 3-Dimethylaminopropyllithium, 3-diethylaminopropyllithium, 4-(Methylpropylamino)butyllithium and 4-Hexamethyleneiminobutyllithium. Examples of alkyllithium compounds with an amino group having a structure in which active hydrogen is protected include, but are not limited to, 3-bistrimethylsilylaminopropyllithium and 4-trimethylsilylmethylaminobutyllithium. Examples of dialkylaminolithiums include, but are not limited to: lithium dimethylamide, lithium diethylamide, lithium dipropylamide, lithium dibutylamide, lithium di-n-hexylamide, lithium diheptylamide, lithium diisopropylamide, lithium dioctylamide, lithium di-2-ethylhexylamide, lithium didecylamide, lithium ethylpropylamide, lithium ethylbutylamide, lithium ethylbenzylamide, lithium methylphenethylamide, lithium hexamethyleneimide, lithium pyrrolidide, lithium piperidide, lithium heptamethyleneimide, lithium morpholide, 1-lithioazacyclooctane, 6-lithio-1,3,3-trimethyl-6-azabicyclo[3.2.1]octane and 1-lithio-1,2,3,6-tetrahydropyridine. These organomonolithium compounds with a substituted amino group can be used as oligomeric organomonolithium compounds, soluble in n-hexane and cyclohexane, by reacting a small amount of a polymerizable monomer, e.g., a monomer such as 1,3-butadiene, isoprene, or styrene. From the perspective of easy industrial availability and easier control of polymerization reactions, the organomonolithium compound is preferably an alkyllithium compound. In this case, a conjugated diene-based polymer with an alkyl group at the end of the polymerization initiation is obtained. Examples of alkyllithium compounds include, but are not limited to: n-butyllithium, sec-butyllithium, tert-butyllithium, n-hexyllithium, benzyllithium, phenyllithium and stilbenelithium. From the point of view of easy industrial availability and easy control of polymerization reactions, n-butyllithium and sec-butyllithium are preferred as alkyllithium compounds. These organomonolithium compounds can be used alone or in combination with two or more. They can also be used in combination with other organometallic compounds. Other examples of organometallic compounds include: alkaline earth metal compounds, other alkali metal compounds, and other organometallic compounds. Examples of alkaline earth metal compounds include, but are not limited to: organic magnesium compounds, organic calcium compounds, and organic strontium compounds. Furthermore, alkoxides, sulfonates, carbonates, and amide compounds of alkaline earth metals are also mentioned. Examples of organic magnesium compounds include dibutylmagnesium and ethylbutylmagnesium. Other examples of organometallic compounds include organic aluminum compounds. Examples of polymerization reaction modes in the polymerization step include, but are not limited to: a batch type and a continuous polymerization reaction type. In the continuous type, one, two, or more interconnected reactors can be used. For example, a tank-type reactor with a stirrer or a pipe-type reactor is used. In a continuous type, a monomer, an inactive solvent, and a polymerization initiator are preferably fed continuously into the reactor, a polymer solution containing the polymer is obtained in the reactor, and the polymer solution is continuously drained off. A batch reactor, for example, is a tank-type reactor equipped with a stirring machine. In a batch reactor, the monomer, the inactive solvent, and the polymerization initiator are preferably added, and the monomer is added continuously or intermittently as needed during polymerization. A polymer solution containing the polymer is obtained in the reactor, and the polymer solution is drained off after polymerization is complete. In order to obtain a conjugated diene-based polymer with a high proportion of active ends in the manufacturing process of the conjugated diene-based polymer (A1), the continuous type is preferred, in which the polymer can be continuously drained and subjected to the next reaction in a short time. In the polymerization step of a conjugated diene-based polymer, it is preferred to carry out the polymerization in an inactive solvent. Examples of inactive solvents include hydrocarbon solvents such as saturated hydrocarbons and aromatic hydrocarbons. Specific examples of hydrocarbon solvents include, but are not limited to: aliphatic hydrocarbons such as butane, pentane, hexane, and heptane; alicyclic hydrocarbons such as cyclopentane, cyclohexane, methylcyclopentane, and methylcyclohexane; aromatic hydrocarbons such as benzene, toluene, and xylene; and hydrocarbons comprising mixtures of these. Before it is subjected to a polymerization reaction, treatment of the allenes and acetylenes, which are impurities, with a metal-organic compound tends to yield a conjugated diene-based polymer with a high concentration of active end, and a modified conjugated diene-based polymer with a high degree of modification is obtained, which is preferred. A polar compound can also be added during the polymerization step. This allows an aromatic vinyl compound to be randomly copolymerized with a conjugated diene compound, and the polar compound can potentially also be used as a vinylizing agent to control the microstructure of the conjugated diene moiety. Furthermore, it tends to be effective in promoting the polymerization reaction. Polar compounds used include, but are not limited to: ethers such as tetrahydrofuran, diethyl ether, dioxane, ethylene glycol dimethyl ether, ethylene glycol dibutyl ether, diethylene glycol dimethyl ether, diethylene glycol dibutyl ether, dimethoxybenzene, 2,2-bis(2-oxolanyl)propane; tertiary amine compounds such as tetramethylethylenediamine, dipiperidinoethane, trimethylamine, triethylamine, pyridine, quinuclidine; alkali metal alkoxide compounds such as potassium tert-amylate, potassium tert-butyrate, sodium tert-butyrate, sodium amylate; and phosphine compounds such as triphenylphosphine, etc. These polar compounds can be used alone or in combination with two or more. The amount of polar compound used is not particularly limited and can be selected according to the objective, etc., although it is preferred that it be 0.01 mol or more and 100 mol or less with respect to 1 mol of polymerization initiator. Such a polar compound (vinylating agent) can be used in a suitable amount corresponding to a desired amount of vinyl bonding as a regulator of the microstructure of the conjugated diene moiety of the conjugated dein-based polymer. Many polar compounds exhibit an effective randomization effect in the copolymerization of conjugated diene compounds and aromatic vinyl compounds and can tend to be used as a regulator to adjust the distribution of aromatic vinyl compounds or the amount of styrene block. As a method for randomizing the conjugated diene compound and the aromatic vinyl compound, a process can be used, as specified, for example, in patent disclosure JP 59-140221A, in which a copolymerization reaction is started with the total amount of styrene and a portion of 1,3-butadiene, and the remaining 1,3-butadiene is added intermittently during the copolymerization reaction. The polymerization temperature in the polymerization step is preferably the temperature at which the living anionic polymerization takes place, and, from a productivity standpoint, is more preferably 0°C or higher, and even more preferably 120°C or lower. Being in such a range increases the likelihood that a sufficient amount of the modifier reacts with the active end after completion of the polymerization. Even more preferably, the temperature is 50°C or higher and 100°C or lower. In the manufacturing process of the conjugated diene-based polymer (A1), the amount of branching agent added in the branching step in which the main chain branching structure is formed is not particularly limited and can be selected according to the purpose, etc., but it is preferably 0.03 mol and more and 0.5 mol and less based on 1 mol of the polymerization initiator, more preferably 0.05 mol and more and 0.4 mol and less, and even more preferably 0.01 mol and more and 0.25 mol and less. The branching agent can be used in an appropriate amount according to the number of branching points in the main chain branching structure of the conjugated diene moiety of the desired conjugated diene-based polymer (A1). Although the timing of the addition of the branching agent in the branching step is not particularly restricted and can be selected according to the purpose, etc., from the point of view of improving the absolute molecular weight of the conjugated diene-based polymer and improving the degree of modification, the timing is preferred at which a raw material conversion rate after the addition of the polymerization initiator is 20% or more, more preferably 40% or more, even more preferably 50% or more, even more preferably 65% ​​or more, and even more preferably 75% or more. Furthermore, after the addition of the branching agent, the polymerization step after branching can be continued by adding further desired raw materials, and the specified contents can be repeated. Although the monomer to be added is not particularly limited, from the point of view of improving the degree of modification of the conjugated diene-based polymer it is preferably 5% or more of the total amount of the conjugated diene monomer used in the polymerization step, e.g. the total amount of butadiene, more preferably 10% or more, more preferably 15% or more, more preferably 20% or more, and more preferably 25% or more. The conjugated diene-based polymer prior to the modification reaction step obtained in the polymerization / branching step in the manufacturing process of conjugated diene-based polymer (A1) preferably has a Mooney viscosity measured at 110°C of 10 or more and 150 or less, more preferably 15 or more and 140 or less, and even more preferably 20 or more and 130 or less. In this area, the conjugated diene-based polymer composition of the present embodiment tends to stand out in terms of processability and wear resistance. The conjugated diene-based polymer (A1) of the present embodiment can be a polymer comprising an aromatic vinyl compound and a conjugated diene-based polymer, wherein this can be either a polymer with a conjugated diene monomer, an aromatic vinyl monomer and a branching agent or a copolymer with a conjugated diene monomer, an aromatic vinyl monomer, a branching agent and monomers other than these. For example, if the conjugated diene monomer is butadiene or isoprene and this is polymerized with a branching agent containing an aromatic vinyl moiety, a polymer is produced in which the polymerized chain is a so-called polybutadiene or polyisoprene, and the branched portion comprises a structure derived from aromatic vinyl. This structure allows for improved linearity per polymer chain and increased cross-linked density after vulcanization, resulting in enhanced wear resistance of the polymer. Therefore, it is suitable for applications such as tires, resin modification, automotive interiors / exteriors, anti-vibration rubber, and footwear. When the conjugated diene-based polymer is used for tire tread applications, a copolymer of a conjugated diene monomer, an aromatic vinyl monomer, and a branching agent is suitable, and in the copolymer for this application, the amount of bonded conjugated diene is preferably 40 wt% or more and 100 wt% or less, and more preferably 55 wt% or more and 80 wt% or less. Furthermore, the amount of bound aromatic vinyl in the conjugated diene-based polymer (A1) is not particularly limited, but is 0 wt% or more and 60 wt% or less and more preferably 20 wt% or more and 45 wt% or less. If the amount of bound conjugated diene and the amount of bound aromatic vinyl are within the above range, the balance between low hysteresis loss and wet performance, as well as wear resistance and fracture properties, tend to be better when these are processed into a vulcanizate. The amount of bound aromatic vinyl can be measured here by the UV absorption of the phenyl group, from which the amount of bound conjugated diene can also be determined. Specifically, the amount is measured according to the method described in the embodiments outlined later. In the conjugated diene-based polymer (A1), the amount of vinyl bonds in the bonding unit of the conjugated diene is not particularly limited, but is preferably 10 mol% or more and 75 mol% or less and more preferably 20 mol% or more and 65 mol% or less. If the amount of vinyl bonds is within the above range, the balance between low hysteresis loss and wet performance, as well as wear resistance and fracture strength, tend to be better when these have been processed into a vulcanizate. If the conjugated diene-based polymer (A1) is a copolymer of butadiene and styrene, the amount of vinyl bonds in the butadiene bonding unit (1,2 bond quantity) can be determined by Hampton's method (RR Hampton, Analytical Chemistry, 21, 923(1949)). Specifically, it is measured using the method described in the embodiments described later. Regarding the microstructure of the conjugated diene-based polymer (A1), there is a tendency that if the amount of each bond in the conjugated diene-based polymer (A1) is within the above-mentioned numerical range and furthermore the glass transition temperature of the conjugated diene-based polymer (A1) is in the range of -70°C or more and -15°C or less, a vulcanizate with an even more excellent balance between fuel-saving performance and wet-weather performance can be obtained. Regarding the glass transition temperature, the DSC curve is recorded according to ISO 22768:2006 while the temperature is raised within a predefined temperature range, and the inflection point of the DSC derivative curve is considered the glass transition temperature. Specifically, the measurement is performed using the method described in the embodiments outlined later. The conjugated diene-based polymer (A1) is a conjugated diene-aromatic vinyl copolymer, and the number of blocks with 30 or more aromatic vinyl units linked together is preferably small or nonexistent. More specifically, when the conjugated diene-based polymer (A1) is a butadiene-styrene copolymer, in the known process in which the copolymer is decomposed according to Kolthoff's method (process described in I.M. KOLTHOFF, et al., J. Polym. Sci. 1, 429 (1946)) and the amount of polystyrene insoluble in methanol is analyzed, the block with 30 or more aromatic vinyl units linked together is preferably 5.0 wt% or less and more preferably 3.0 wt% or less, based on the total amount of the conjugated diene-based polymer. The conjugated diene-based polymer (A1) is a conjugated diene-aromatic vinyl copolymer, and from the point of view of improving fuel-saving performance, the proportion of aromatic vinyl units present on their own is preferably large. Specifically, if the conjugated diene-based polymer (A1) is a butadiene-styrene copolymer, and the conjugated diene-based polymer is decomposed by the ozonolysis method known as the method of Tanaka et al. (Polymer, 22, 1721 (1981)), and the styrene chain distribution is analyzed by GPC, it is preferred that the amount of isolated styrene is preferably 40 wt% or more based on the total amount of bound styrene, and that the styrene chain structure has eight or more styrene chains equal to or less than 5.0 wt%. In this case, the resulting vulcanized rubber achieves excellent performance with particularly low hysteresis losses. (Reaction step) In the manufacturing process of a conjugated diene-based polymer (A1), the active end of the conjugated diene-based polymer obtained by the above-mentioned polymerization / branching step is coupled with a coupling agent, e.g., a tri- or multifunctional reactive compound, and / or modified with a modifier containing a nitrogen atom group (preferably a coupling agent containing a nitrogen atom group). The step towards coupling and / or the step towards modification will be referred to below as the reaction step. In the reaction step, one end of the active end of the conjugated diene-based polymer is subjected to a modification reaction with a coupling agent or a modifier containing a nitrogen atom group to obtain the modified conjugated diene-based polymer. <kupplungsmittel> The coupling agent used in the reaction step of the manufacturing process of conjugated diene-based polymer (A1) can be a tri- or multifunctional reactive compound with any structure, but is preferably a silicon-containing, tri- or multifunctional reactive compound, more preferably having at least four silicon-containing functional groups. A more preferred coupling agent is a compound in which at least one silicon atom forms an alkoxysilyl group or a silanol group with 1 to 20 carbon atoms. Examples of such coupling agents include tetramethoxysilane, tetraethoxysilane, and the like. <modifikator> Als Modifikator werden z. B. angeführt, ohne darauf beschränkt zu sein: Tris(3-trimethoxysilylpropyl)amin, Tris(3-triethoxysilylpropyl)amin, Tris(3-tripropoxysilylpropyl)amin, Bis(3-trimethoxysilylpropyl)-[3(2,2-dimethoxy-1-aza-2(-silacyclopentan)propyl]amin, Tetrakis(3-trimethoxysilylpropyl)-1,3-propandiamin, Tris(3-trimethoxysilylpropyl)-[3(1-methoxy-2-trimethylsilyl-1-sila-2-azacyclopentan)propyl]-1,3-propandiamin, Tris(3-trimethoxysilylpropyl)-[3(1-methoxy-2-methyl-1-sila-2-azacyclopentan)propyl]-1,3-propandiamin, Bis(3-triethoxysilylpropyl)-[3(2,2-diethoxy-1-aza-2-silacyclopentan)propyl]-[3(1-ethoxy-2-trimethylsilyl-1-sila-2-azacyclopentan)propyl]-1,3-propandiamin, Tetrakis(3-trimethoxysilyl-propyl)-1,3-bisaminomethylcyclohexan, Tris(3-trimethoxysilylpropyl)-[3(2,2-dimethoxy-1-aza-2-silacyclopentan)propyl]-1,3-bisaminomethylcyclohexan, Tetrakis(3-trimethoxysilylpropyl)-1,6-hexamethylendiamin, Pentachys(3-trimethoxysilylpropyl)-diethylentriamin,Tris(3-trimethoxysilylpropyl)-methyl-1,3-propandiamin, Tetrakis[3(2,2-dimethoxy-1-aza-2-silacyclopentan)propyl]silan, Bis(3-trimethoxysilylpropyl)-bis[3(2,2-dimethoxy-1-aza-2-silacyclopentan)propyl]silan, Tris[3(2,2-dimethoxy-1-aza-2-silacyclopentan)propyl]-(3-trimethoxysilylpropyl)silan, Tris[3-(2,2-dimethoxy-1-aza-2-silacyclopentan)propyl]-[3-(1-methoxy-2-trimethylsilyl-1-sila-2-azacyclopentan)propyl]silan, 3-Tris[2-(2,2-dimethoxy-1-aza-2-silacyclopentan)ethoxy]silyl-1-trimethoxysilylpropan, 1-[3-(1-Methoxy-2-trimethylsilyl-1-sila-2-azacyclopentan)propyl]-3,4,5-tris(3-trimethoxysilylpropyl)-cyclohexan, 1-[3-(2,2-Dimethoxy-1-aza-2-silacyclopentan)propyl]-3,4,5-tris(3-trimethoxysilylpropyl)-cyclohexan, 3,4,5-Tris(3-trimethoxysilylpropyl)-cyclohexyl-[3(2,2-dimethoxy-1-aza-2-silacyclopentan)propyl]ether, (3-Trimethoxysilylpropyl)phosphat, Bis(3-trimethoxysilylpropyl)-[3-(2,2-dimethoxy-1-aza-2-silacyclopentan)propyl]phosphat, Bis[3-(2,2-dimethoxy-1-aza-2-silacyclopentane)propyl]-(3-trimethoxysilylpropyl)phosphate, and tris[3-(2,2-dimethoxy-1-aza-2-silacyclopentane)propyl]phosphate., The modifier preferably comprises a compound represented by one of the general formulas (A) to (C) below. (In formula (A) R1-R4 independently show an alkyl group with 1 to 20 carbon atoms or an aryl group with 6-20 carbon atoms, R5 shows an alkylene group with 1 to 10 carbon atoms and R6 shows an alkylene group with 1 to 20 carbon atoms. m represents an integer of 1 or 2, n represents an integer of 2 or 3, and (m + n) represents an integer of 4 or more. R1-R4 are independent of each other if there is a plurality of them. (In formula (B) R1-R6 independently show an alkyl group with 1 to 20 carbon atoms or an aryl group with 6-20 carbon atoms and R7-R9 independently show an alkylene group with 1 to 20 carbon atoms. m, n, and l independently represent an integer from 1 to 3, and (m + n + l) represents an integer of 4 or more. R1-R6 are independent if there is a plurality of them. (In formula (C) R12-R14 independently show a single bond or an alkylene group with 1 to 20 carbon atoms, R15-R18 and R20 independently show an alkylene group with 1 to 20 carbon atoms, R19 and R22 independently show an alkylene group with 1 to 20 carbon atoms and R21 shows an alkylene group with 1 to 20 carbon atoms or a trialkylsilyl group. m represents an integer from 1 to 3 and p represents 1 or 2. R12-R22, m and p are independent of each other and can be the same or different if there is a plurality of them. i represents an integer from 0 to 6, j represents an integer from 0 to 6, k represents an integer from 0 to 6, and (i+j+k) is an integer from 4 to 10. A stands for a hydrocarbon group with 1 to 20 carbon atoms or an organic group with at least one atom selected from the group consisting of an oxygen atom, a nitrogen atom, a silicon atom, a sulfur atom and a phosphorus atom and without active hydrogen). Examples of modifiers represented by formula (A) include, but are not limited to: 2,2-Dimethoxy-1-(3-trimethoxysilylpropyl)-1-aza-2-silacyclopentane, 2,2-Diethoxy-1(3-triethoxysilylpropyl)-1-aza-2-silacyclopentane, 2,2-Dimethoxy-1-(4-trimethoxysilylbutyl)-1-aza-2-silacyclohexane, 2,2-Dimethoxy-1-(5-trimethoxysilylpentyl)-1-aza-2-silacycloheptane, 2,2-Dimethoxy-1(3-dimethoxymethylsilylpropyl)-1-aza-2-silacyclopentane, 2,2-Diethoxy-1-(3-diethoxyethylsilylpropyl)-1-aza-2-silacyclopentane, 2-methoxy,2-methyl-1-(3-trimethoxysilylpropyl)-1-aza-2-silacyclopentane, 2-ethoxy,2-ethyl-1(3-triethoxysilylpropyl)-1-aza-2-silacyclopentane, 2-methoxy,2-methyl-1-(3-dimethoxymethylsilylpropyl)-1-aza-2-silacyclopentane and 2-Ethoxy,2-ethyl-1-(3-diethoxyethylsilylpropyl)-1-aza-2-silacyclopentane. Among these, those where m 2 and n 3 are preferred, considering reactivity and the interaction between the functional group of the modifier and an inorganic filler such as silicon dioxide, as well as processability. Specifically, 2,2-Dimethoxy-1-(3-trimethoxysilylpropyl)-1-aza-2-silacyclopentane and 2,2-Diethoxy-1-(3-triethoxysilylpropyl)-1-aza-2-silacyclopentane are preferred. Although the reaction temperature, reaction time, etc. are not particularly restricted in the reaction of the modifier represented by formula (A) with the active end of the polymerization, the reaction is preferably carried out at 0°C or more and 120°C or less for 30 seconds or longer. The total mole number of the alkoxy group bonded to the silyl group in the modifier compound represented by formula (A) is preferably in the range of 0.6 times or more and 3.0 times or less of the added mole number of the alkali metal compound and / or alkaline earth metal compound of the polymerization initiator, more preferably in the range of 0.8 times or more and 2.5 times or less, and even more preferably in the range of 0.8 times or more and 2.0 times or less.From the perspective that the resulting modified conjugated diene-based polymer retains a sufficient degree of modification, as well as a molecular weight and a branching structure, the total mole number is preferably 0.6 times or more, and in addition to the fact that, to improve processability, the polymer ends are preferably coupled together to obtain a branched polymer component, from the perspective of modifier costs, the total mole number is preferably 3.0 times or less. The more specific mole number of the polymerization initiator, relative to the mole number of the modifier, is preferably 3.0 times or more, and more preferably 4.0 times or more. Examples of modifiers represented by formula (B) include, but are not limited to: Tris(3-trimethoxysilylpropyl)amine, Tris(3-methyldimethoxysilylpropyl)amine, Tris(3-triethoxysilylpropyl)amine, Tris(3-methyldiethoxysilylpropyl)amine, Tris(trimethoxysilylmethyl)amine, Tris(2-trimethoxysilylethyl)amine and Tris(4-trimethoxysilylbutyl)amine. Among these, those where n, m, and l all exhibit 3 are preferred, considering reactivity and the interaction between the functional group of the modifier and the inorganic filler such as silicon dioxide, as well as processability. Tris(3-trimethoxysilylpropyl)amine and tris(3-triethoxysilylpropyl)amine are cited as preferred specific examples. Although the reaction temperature, reaction time, etc. are not particularly restricted in the reaction of the modifier represented by formula (B) with the active end of the polymerization, the reaction is preferably carried out at 0°C or more and 120°C or less for 30 seconds or longer. The total number of moles of alkoxy groups bonded to the silyl group in the compound of the modifier represented by formula (B) is preferably in a range of 0.6 times or more and 3.0 times or less of the number of moles of lithium forming the polymerization initiator mentioned above, more preferably in a range of 0.8 times or more and 2.5 times or less, and even more preferably in a range of 0.8 times or more and 2.0 times or less.From the perspective that the modified conjugated diene-based polymer obtains a sufficient degree of modification, as well as a molecular weight and a branching structure, the total mole number is preferably 0.6 times or more, and in addition to the fact that, to improve processability, the polymer ends are preferably coupled together to obtain the branched polymer component, from the perspective of modifier costs, the total mole number is preferably 3.0 times or less. The more specific mole number of the polymerization initiator, relative to the mole number of the modifier, is preferably 4.0 times or more, and more preferably 5.0 times or more. In formula (C), A is preferably represented by one of the following general formulas (II) to (V). (In formula (II), B1 represents a single bond or a hydrocarbon group with 1 to 20 carbon atoms, and a represents an integer from 1 to 10. B1s are independent of each other if there is a plurality of them.) (In formula (III), B2 represents a single bond or a hydrocarbon group with 1 to 20 carbon atoms, B3 represents an alkyl group with 1 to 20 carbon atoms, and a represents an integer from 1 to 10. B2 and B3 are independent of each other if a plurality of them is present.) (In formula (IV), B4 represents a single bond or a hydrocarbon group with 1 to 20 carbon atoms, and a represents an integer from 1 to 10. B4s are independent of each other if a plurality of them are present). (In formula (V), B5 represents a single bond or a hydrocarbon group with 1 to 20 carbon atoms, and a represents an integer from 1 to 10. B5s are independent of each other if a plurality of them are present). In formula (C), the following are used as modifiers in the case where A is represented by formula (II), e.g. B. listed, but not limited to: Tris(3-trimethoxysilylpropyl)amine, Bis(3-trimethoxysilylpropyl)-[3-[3(2,2-dimethoxy-1-aza-2-silacyclopentane)propyl]amine, Bis[3-(2,2-dimethoxy-1-aza-2-silacyclopentane)propyl]-(3-trimethoxysilylpropyl)amine, Tris[3-(2,2-dimethoxy-1-aza-2-silacyclopentane)propyl]amine, Tris(3-ethoxysilylpropyl)amine, Bis(3-triethoxysilylpropyl)-[3-(2,2-diethoxy-1-aza-2-silacyclopentane)propyl]amine, Bis[3-(2,2-diethoxy-1-aza-2-silacyclopentane)propyl]-(3-triethoxysilylpropyl)amine, Tris[3-(2,2-diethoxy-1-aza-2-silacyclopentane)propyl]amine, Tetrakis(3-trimethoxysilylpropyl)-1,3-propanediamine, Tris(3-trimethoxysilylpropyl)-[3-(2,2-dimethoxy-1-aza-2-silacyclopentane)propyl]-1,3-propanediamine, Bis(3-trimethoxysilylpropyl)-bis[3-(2,2-dimethoxy-1-aza-2-silacyclopentane)propyl]-1,3-propanediamine, Tris[3-(2,2-dimethoxy-1-aza-2-silacyclopentane)propyl]-(3-trimethoxysilylpropyl)-1,3-propandiamin, Tetrakis[3-(2,2-dimethoxy-1-aza-2-silacyclopentan)propyl]-1,3-propandiamin, Tris(3-trimethoxysilylpropyl)-[3-(1-methoxy-2-trimethylsilyl-1-sila-2-azacyclopentan)propyl]-1,3-propandiamin, Bis(3-trimethoxysilylpropyl)-[3-(2,2-dimethoxy-1-aza-2-silacyclopentan)propyl]-[3-(1-methoxy-2-trimethylsilyl-1-sila-2-azacyclopentan)propyl]-1,3-propandiamin, Bis[3-(2,2-dimethoxy-1-aza-2-silacyclopentan)propyl]-(3-trimethoxysilylpropyl)-[3-(1-methoxy-2-trimethylsilyl-1-sila-2-azacyclopentan)propyl]-1,3-propandiamin, Tris[3-(2,2-dimethoxy-1-aza-2-silacyclopentan)propyl]-[3(1-methoxy-2-trimethylsilyl-1-sila-2-azacyclopentan)propyl]-1,3-propandiamin, Tetrakis(3-triethoxysilylpropyl)-1,3-propandiamin, Tris(3-triethoxysilylpropyl)-[3-(2,2-diethoxy-1-aza-2-silacyclopentan)propyl]-1,3-propandiamin, Bis(3-triethoxysilylpropyl)-bis[3-(2,2-diethoxy-1-aza-2-silacyclopentan)propyl]-1,3-propandiamin, Tris[3-(2,2-diethoxy-1-aza-2-silacyclopentan]propyl]-(3-triethoxysilylpropyl)-1,3-propandiamin,Tetrakis[3-(2,2-diethoxy-1-aza-2-silacyclopentan)propyl]-1,3-propandiamin, Tris(3-triethoxysilylpropyl)-[3-(1-ethoxy-2-trimethylsilyl-1-sila-2-azacyclopentan)propyl]-1,3-propandiamin, Bis(3-triethoxysilylpropyl)-[3-(2,2-diethoxy-1-aza-2-silacyclopentan)propyl]-[3(1-ethoxy-2-trimethylsilyl-1-sila-2-azacyclopentan)propyl]-1,3-propandiamin, Bis[3-(2,2-diethoxy-1-aza-2-silacyclopentan)propyl]-(3-triethoxysilylpropyl)-[3-(1-ethoxy-2-trimethylsilyl-1-sila-2-azacyclopentan)propyl]-1,3-propandiamin, Tris[3-(2,2-diethoxy-1-aza-2-silacyclopentan)propyl]-[3(1-ethoxy-2-trimethylsilyl-1-sila-2-azacyclopentan)propyl]-1,3-propandiamin, Tetrakis(3-trimethoxysilylpropyl)-1,3-Bisaminomethylcyclohexan, Tris(3-Trimethoxysilylpropyl)-[3-(2,2-dimethoxy-1-aza-2-silacyclopentan)propyl]-1,3-bisaminomethylcyclohexan, Bis(3-trimethoxysilylpropyl)-bis[3-(2,2-dimethoxy-1-aza-2-silacyclopentan)propyl]-1,3-bisaminomethylcyclohexan, Tris[3-(2,2-dimethoxy-1-aza-2-silacyclopentan)propyl]-(3-trimethoxysilylpropyl)-1,3-bisaminomethylcyclohexan, Tetrakis[3-(2,2-dimethoxy-1-aza-2-silacyclopentan)propyl]-1,3-propandiamin, Tris(3-trimethoxysilylpropyl)-[3-(1-methoxy-2-Trimethylsilyl-1-sila-2-azacyclopentan)propyl]-1,3-bisaminomethylcyclohexan, Bis(3-trimethoxysilylpropyl)-[3-(2,2-dimethoxy-1-aza-2-silacyclopentan)propyl]-[3-(1-methoxy-2-trimethylsilyl-1-sila-2-azacyclopentan)propyl]-1,3-bisaminomethylcyclohexan, Bis[3-(2,2-dimethoxy-1-aza-2-silacyclopentan)propyl]-(3-trimethoxysilylpropyl)-[3-(1-methoxy-2-trimethylsilyl-1-sila-2-azacyclopentan)propyl]-1,3-bisaminomethylcyclohexan, Tris[3-(2,2-dimethoxy-1-aza-2-silacyclopentan)propyl]-[3-(1-methoxy-2-trimethylsilyl-1-sila-2-azacyclopentan)propyl]-1,3-bisaminomethylcyclohexan, Tetrakis(3-triethoxysilylpropyl)-1,3-propandiamin, Tris(3-triethoxysilylpropyl)-[3-(2,2-diethoxy-1-aza-2-silacyclopentan)propyl]-1,3-bisaminomethylcyclohexan, Bis(3-triethoxysilylpropyl)-bis[3-(2,2-diethoxy-1-aza-2-silacyclopentan)propyl]-1,3-bisaminomethylcyclohexan, Tris[3-(2,2-diethoxy-1-aza-2-silacyclopentan)propyl]-(3-triethoxysilylpropyl)-1,3-propandiamin, Tetrakis[3-(2,2-diethoxy-1-aza-2-silacyclopentan)propyl]-1,3-propandiamin, Tris(3-triethoxysilylpropyl)-[3-(1-ethoxy-2-trimethylsilyl-1-sila-2-azacyclopentan)propyl]-1,3-bisaminomethylcyclohexan, Bis(3-triethoxysilylpropyl)-[3-(2,2-diethoxy-1-aza-2-silacyclopentan)propyl]-[3-(1-ethoxy-2-trimethylsilyl-1-sila-2-azacyclopentan)propyl]-1,3-bisaminomethylcyclohexan, Bis[3-(2,2-diethoxy-1-aza-2-silacyclopentan)propyl]-(3-triethoxysilylpropyl)-[3-(1-ethoxy-2-trimethylsilyl-1-sila-2-azacyclopentan)propyl]-1,3-bisaminomethylcyclohexan, Tris[3-(2,2-diethoxy-1-aza-2-silacyclopentan)propyl]-[3-(1-ethoxy-2-trimethylsilyl-1-sila-2-azacyclopentan)propyl]-1,3-bisaminomethylcyclohexan, Tetrakis(3-trimethoxysilylpropyl)-1,6-hexamethylendiamin und Pentakis(3-trimethoxysilylpropyl)-diethylentriamin., In formula (C), the following are listed as modifiers in the case where A is represented by formula (III), for example, but not limited to: Tris(3-trimethoxysilylpropyl)-methyl-1,3-propanediamine, Bis(2-trimethoxysilylpropyl)-[3-(2,2-dimethoxy-1-aza-2-silacyclopentane)-propyl]-methyl-1,3-propanediamine, Bis[3-(2,2-dimethoxy-1-aza-2-silacyclopentane)propyl]-(3-trimethoxysilylpropyl)-methyl-1,3-propanediamine, Tris(3-triethoxysilylpropyl)-methyl-1,3-propanediamine, Bis(2-triethoxysilylpropyl)-[3-(2,2-diethoxy-1-aza-2-silacyclopentane)propyl]-methyl-1,3-propanediamine, Bis[3-(2,2-diethoxy-1-aza-2-silacyclopentane)propyl]-(3-triethoxysilylpropyl)-methyl-1,3-propanediamine, N1,N1'-(propane-1,3-diyl)bis(N1-methyl-N3,N3-bis(3-(trimethoxysilyl)propyl)-1,3-propanediamine) and N1-(3-(bis(3-(trimethoxysilyl)propyl)amino)propyl)-N1-methyl-N3-(3-(methyl(3-(trimethoxysilyl)propyl)amino)propyl)-N3-(3-(trimethoxysilyl)propyl)-1,3-propanediamine. In formula (C), the following are listed as modifiers in the case where A is represented by formula (IV), for example, but not limited to: Tetrakis[3-(2,2-dimethoxy-1-aza-2-silacyclopentane)propyl]silane, Tris[3-(2,2-dimethoxy-1-aza-2-silacyclopentane)propyl]-(3-trimethoxysilylpropyl)silane, Tris[3-(2,2-dimethoxy-1-aza-2-silacyclopentane)propyl]-[3-(1-methoxy-2-trimethylsilyl-1-sila-2-azacyclopentane)propyl]silane, Bis(3-trimethoxysilylpropyl)-bis[3-(2,2-dimethoxy-1-aza-2-silacyclopentane)propyl]silane, (3-trimethoxysilyl)-[3-(1-methoxy-2-trimethylsilyl-1-sila-2-azacyclopentane)-bis[3-(2,2-dimethoxy-1-aza-2-silacyclopentane)propyl]silane, Bis[3-(1-methoxy-2-trimethylsilyl-1-sila-2-azacyclopentane)-bis[3-(2,2-dimethoxy-1-aza-2-silacyclopentane)propyl]silane, tris(3-trimethoxysilylpropyl)-[3(2,2-dimethoxy-1-aza-2-silacyclopentane)propyl]silane, Bis(3-trimethoxysilylpropyl)-[3-(1-methoxy-2-trimethylsilyl-1-sila-2-azacyclopentane)propyl]-[3-(2,2-dimethoxy-1-aza(2-silacyclopentane)propyl]silane,Bis[3-(1-methoxy-2-trimethylsilyl-1-sila-2-azacyclopentane)propyl]-bis(3-trimethoxysilylpropyl)silane and bis(3-trimethoxysilylpropyl)-bis[3-(1-methoxy-2-methyl-1-sila-2-azacyclopentane)propyl]silane., In formula (C), the following are listed as modifiers in the case where A is represented by formula (V), for example, but not limited to: 3-Tris[2-(2,2-dimethoxy-1-aza-2-silacyclopentane)ethoxy]silyl-1-(2,2-dimethoxy-1-aza-2-silacyclopentane)-propane and 3-Tris[2-(2,2-dimethoxy-1-aza-2-silacyclopentane)ethoxy]silyl-1-trimethoxysilylpropane. In formula (C), A is preferably represented by formula (II) or formula (III), where k points to 0. Such modifiers tend to be easily obtained and also exhibit greater wear resistance and low hysteresis loss performance when the conjugated diene-based polymer composition of the present embodiment, comprising the conjugated diene-based polymer (A1), has been processed into a vulcanizate. Such modifiers are called, for example, ... B. listed, without being limited to: Bis(3-trimethoxysilylpropyl)-[3-(2,2-dimethoxy-1-aza-2-silacyclopentane)propyl]amine, Tris(3-trimethoxysilylpropyl)amine, Tris(3-triethoxysilylpropyl)amine, Tris(3-trimethoxysilylpropyl)-[3-(2,2-dimethoxy-1-aza-2-silacyclopentane)propyl]-1,3-propanediamine, Tetrakis[3-(2,2-dimethoxy-1-aza-2-silacyclopentane)propyl]-1,3-propanediamine, Tetrakis(3-trimethoxysilylpropyl)-1,3-propanediamine, Tetrakis(3-trimethoxysilylpropyl)-1,3-bisaminomethylcyclohexane, Tris(3-trimethoxysilylpropyl)-methyl-1,3-propanediamine and Bis[3-(2,2-dimethoxy-1-aza-2-silacyclopentane)propyl]-(3-trismethoxysilylpropyl)methyl-1,3-propanediamine. In formula (C) A is more preferably represented by formula (II) or formula (III), where k represents 0 and in formula (II) or formula (III) a represents an integer from 2 to 10. This results in a tendency towards excellent wear resistance and low hysteresis loss performance when the conjugated diene-based polymer composition is processed into a vulcanizate. Examples of such modifiers include, but are not limited to: Tetrakis[3-(2,2-dimethoxy-1-aza-2-silacyclopentane)propyl]-1,3-propanediamine, Tetrakis(3-trimethoxysilylpropyl)-1,3-propanediamine, Tetrakis(3-trimethoxysilylpropyl)-1,3-bisaminomethylcyclohexane and N1-(3-(bis(3-trimethoxysilyl)propyl)amino)propyl)-N1-methyl-N3-(3(methyl(3-(trimethoxysilyl)propyl)amino)propyl)-N3-(3-(trimethoxysilyl)propyl)-1,3-propanediamine. The amount of compound represented by formula (C) as a modifier can be adjusted such that the modifier reacts with the conjugated diene-based polymer so that the mole number of the conjugated diene-based polymer is in a desired stoichiometric ratio to the mole number of the modifier, thereby tending to achieve the desired star-shaped highly branched structure. The specific mole number of the conjugated diene-based polymer is preferably 5.0 times or more, and more preferably 6.0 times or more, relative to the mole number of the modifier. In this case, in formula (C) the number of functional groups of the modifier ((m-1) × i + p × j + k) is preferably an integer from 5 to 10 and more preferably an integer from 6 to 10. In the modified conjugated diene-based polymer (A1), the proportion of the polymer containing a modified group in the conjugated diene-based polymer (A1) is represented as the degree of modification. In the conjugated diene-based polymer (A1), the degree of modification is preferably 60 wt% or more, more preferably 65 wt% or more, even more preferably 70 wt% or more, more preferably 75 wt% or more, more preferably 80 wt% or more, and particularly preferably 82 wt% or more. By setting the degree of modification to 60% by mass or more, there is a tendency towards excellent processability when processed into a vulcanizate and towards more excellent wear resistance and performance from low hysteresis loss when processed into a vulcanizate. In the manufacturing step of the conjugated diene-based polymer (A1), a condensation reaction step can be carried out after or before the above-mentioned reaction step, in which the condensation reaction is carried out in the presence of a condensation accelerator. In the conjugated diene-based polymer (A1), the conjugated diene moiety may be hydrogenated. The process of hydrogenation of the conjugated diene moiety of the conjugated diene-based polymer (A1) is not particularly restricted, and known methods can be used. A suitable hydrogenation process can be a hydrogenation process by injecting gaseous hydrogen into a polymer solution in the presence of a catalyst. Examples of catalysts include: a heterogeneous catalyst such as one in which a noble metal is supported on a porous inorganic substance; homogeneous catalysts such as one in which a salt such as nickel or cobalt is solubilized and reacted with organic aluminum or the like; and a catalyst using metallocene such as titanocene. Among these, a titanocene catalyst is preferred due to the possibility of selecting mild hydrogenation conditions. Furthermore, the hydrogenation of the aromatic group can be carried out using a precious metal supported catalyst. Examples of hydrogenation catalysts include, but are not limited to: (1) a supported heterogeneous hydrogenation catalyst in which a metal such as Ni, Pt, Pd, or Ru is supported on carbon, silicon dioxide, aluminum oxide, diatomaceous earth, or the like; (2) a so-called Ziegler hydrogenation catalyst using a transition metal salt such as an organic acid salt like Ni, Co, Fe, Cr, or acetylacetone salt, and a reducing agent such as organic aluminum; (3) so-called organometallic complexes such as organometallic compounds like Ti, Ru, Rh, and Zr. Other known hydrogenation catalysts are also listed as hydrogenation catalysts. B. as specified in patent disclosures JP 42-8704, JP 43-6636, JP 63-4841, JP 1-37970, JP 1-53851, JP 2-9041 and JP 8-109219. A reaction mixture of a titanocene compound and a reducing organometallic compound is cited as a preferred hydrogenation catalyst. In the manufacturing process of the conjugated diene-based polymer (A1), a deactivator, a neutralizer, etc. can be added to the polymer solution after the reaction step as required. Examples of deactivators include, but are not limited to: water; alcohols such as methanol, ethanol and isopropanol, etc. Examples of neutralizers include, but are not limited to: carboxylic acids such as stearic acid, oleic acid and versatic acid (a mixture of carboxylic acids with 9 to 11 carbon atoms, mainly 10 and with many branches); an aqueous solution of an inorganic acid and carbon dioxide gas. From the point of view of preventing gel formation after polymerization and from the point of view of improving stability during processing, it is preferred in the conjugated diene-based polymer (A1) that a rubber stabilizer is added. As a stabilizer for rubber, known stabilizers can be used, without being limited to the following, however, an antioxidant such as 2,6-di-tert-butyl-4-hydroxytoluene (BHT), n-octadecyl-3-(4'-hydroxy-3',5'-di-tert-butylphenol)propinate and 2-methyl-4,6-bis[(octylthio)methyl]phenol etc. is preferred. (Extended-length conjugated diene-based polymer) The conjugated diene-based polymer (A1) can be produced as an extended conjugated diene-based polymer by incorporating at least one selected from the group consisting of an extension oil, a liquid rubber and a resin into the conjugated diene-based polymer obtained by the above-mentioned manufacturing step. The extended conjugated diene-based polymer includes not only an oil-extended conjugated diene-based polymer containing oil, but also one containing liquid polybutadiene or various resins in addition to oil. This can further improve the processability of the conjugated diene-based polymer. The method for adding the extension oil to the conjugated diene-based polymer is not limited to the following method, but the method in which the extension oil is added to and mixed with the solution of the conjugated diene-based polymer and the solution of the extended polymer is desolvated is preferred. Examples of extender oils include aromatic oil, naphthene oil, paraffin oil, etc. From the perspective of environmental safety, preventing oil bleed, and maintaining wet performance, an aromatic replacement oil with a polycyclic aromatic (PCA) component of 3% by weight or less, produced according to the IP 346 process, is preferred. Other aromatic replacement oils mentioned include TDAE (Treated Distillate Aromatic Extracts), MES (Mild Extraction Solvate), etc., which are shown in Gummi Gummi Kunststoffe 52 (12) 799 (1999), and RAE (Residual Aromatic Extracts). Examples of liquid rubber include, but are not limited to, liquid polybutadiene, liquid styrene-butadiene rubber, etc. Resins are used, for example, in... B. listed, but not limited to: aromatic petroleum resins, coumarin-indene resins, terpene resins, rosin derivatives (including tung oil resins), tall oil, tall oil derivatives, rosin ester resins, natural and synthetic terpene resins, aliphatic hydrocarbon resins, aromatic hydrocarbon resins, mixed aliphatic-aromatic hydrocarbon resins, coumarin-indene resins, phenolic resins, p-tert-butylphenol acetylene resins, phenol-formaldehyde resins, xylene-formaldehyde resins, oligomers of mono-olefins, oligomers of diolefins, aromatic hydrocarbon resins, aromatic petroleum resins, hydrogenated aromatic hydrocarbon resins, cyclic aliphatic hydrocarbon resins, hydrogenated hydrocarbon resins, hydrocarbon resins, hydrogenated tung oil resins, hydrogenated oil resins, esters from hydrogenated oil resins and mono- or polyfunctional alcohols, etc. These resins can be used individually, or two or more can be used together. In the case of hydrogenation, either all unsaturated groups can be hydrogenated, or some of them can be retained. The amount of at least one selected from the group consisting of the extension oil, the liquid rubber and the resin is not particularly limited, but is preferably 1 to 60 parts by mass, more preferably 10 to 60 parts by mass, and more preferably 15 to 37.5 parts by mass, based on 100 parts by mass of the conjugated diene-based polymer. (Desolution step) A known method can be used to obtain the conjugated diene-based polymer (A1) from the polymer solution. Examples of such methods include: a process in which, after separating the solvent by steam stripping or the like, the conjugated diene-based polymer is filtered off and further dehydrated and dried to obtain the conjugated diene-based polymer; a process in which the solvent is concentrated in a rinsing tank and subsequently deaerated using an extruder, etc.; and a process for direct deaeration using a drum dryer, etc. (Composition of conjugated diene-based polymer composition) The conjugated diene-based polymer composition of the present embodiment contains 20 to 99 parts by mass of the rubber component (A), which is a conjugated diene-based polymer having a glass transition temperature of -35°C or more and -10°C or less, and 1 to 90 parts by mass of the rubber component (B), whose glass transition temperature is -50°C or less and -100°C or more. The rubber component (A) preferably contains 20 wt% or more of the conjugated diene-based polymer (A1), based on the total mass of the rubber component (A). (Rubber component (B)) The conjugated diene-based polymer composition of the present embodiment contains a rubber component (B) with a glass transition temperature of -50°C or less and -100°C or more. The inclusion of this rubber component (B) reduces stiffness at low temperatures when processed into a vulcanizate and improves performance in snow. The lower limit of the glass transition temperature of the rubber component (B) is -100°C or lower. By setting the glass transition temperature to -100°C or lower, it tends to have improved fracture toughness and excellent wear resistance. The rubber component (B) is preferably at least one type selected from the group consisting of natural rubber, high cis-content polybutadiene rubber and polyisoprene rubber. Natural rubber is a substance consisting mainly of cis-polyisoprene, which is contained in the sap of the rubber tree and is produced in vivo by addition polymerization. It is classified and sorted by visual inspection into specific classes RSS1 to RSS5 of the international standard. The polyisoprene rubber mentioned above is a type of synthetic rubber, which is polyisoprene in which isoprene has been chemically polymerized. There are some structural differences between polyisoprene rubber and the polyisoprene found in natural rubbers. First, it is currently not possible to obtain 100% cis bodies from the synthetic polyisoprene rubber, as it contains small amounts of trans bodies. Furthermore, natural rubbers contain traces of proteins and fatty acids in addition to polyisoprene, whereas synthetic polyisoprene does not contain such impurities. Examples of polyisoprene rubber include (trade name) JSR® IR1220, manufactured by JSR, etc. The above high-cis polybutadiene rubber refers, for example, to polybutadiene with a high content of 1,4-cis bonds under polybutadiene, which is produced by solution polymerization using a Ziegler-Natta-type coordination catalyst based on titanium, cobalt, and nickel, or in the presence of an alkyllithium compound, where, for example, UBEPOL BR, manufactured by Ube Industries, Inc., etc., is cited. From the perspective of improving the fracture toughness of the vulcanizate, the rubber component (B) is preferably a natural rubber. Natural rubber tends to have a high molecular weight and excellent fracture toughness compared to synthetic rubber. Furthermore, when processed into a vulcanizate, natural rubber is incompatible with a conjugated diene-based polymer consisting mainly of a styrene-butadiene rubber. The conjugated diene-based polymer composition of the present embodiment contains a subsequently described inorganic silicon dioxide-based filler (C), and the silicon dioxide generally exhibits a high degree of interaction with the styrene-butadiene rubber, and the inorganic silicon dioxide-based filler (C) tends to be localized in the styrene-butadiene rubber phase when processed into a vulcanizate. The localization of the inorganic silicon dioxide-based filler (C) in the styrene-butadiene phase tends to improve the stiffness of the styrene-butadiene phase and the fracture toughness of the vulcanizate. The composition of the conjugated diene-based polymer rubber of the present embodiment contains 20 to 99 parts by mass of the rubber component (A) and 1 to 90 parts by mass of the rubber component (B). A content of 20 parts by mass or more of the rubber component (A) results in an excellent balance between fuel-saving performance and wet-weather performance, while a content of 99 parts by mass or less allows the filler to be sufficiently dispersed and the processability of the conjugated diene-based polymer composition to be practically sufficient. Furthermore, from the point of view of improving performance in snow, the rubber component (B) is 1 part by mass or more, and from the point of view of the practically sufficient processability of the conjugated diene-based polymer composition, it is 90 parts by mass or less. (Inorganic filler based on silicon dioxide (C)) The conjugated diene-based polymer composition of the present embodiment contains an inorganic filler based on silicon dioxide (C). From the perspective of generating rolling resistance and from the perspective of achieving practically sufficient processability, cut resistance, and fatigue resistance, the amount of the inorganic filler based on silicon dioxide is 0.5 to 300 parts by mass, more preferably 5 to 200 parts by mass, and even more preferably 20 to 100 parts by mass, wherein the total amount of the rubber component (A) and the rubber component (B) is assumed to be 100 parts by mass. The inorganic filler based on silicon dioxide (C) is not particularly restricted and, for example, a known filler can be used. Specifically, a solid particle containing SiO₂ or Si₃Al as a constituent unit is preferred as an inorganic filler based on silicon dioxide, wherein SiO₂ or Si₃Al is more preferably contained as the main component of the constituent unit. Here, "contained as the main component" means that the target component is present in the inorganic filler based on silicon dioxide at 50% by weight or more. The inorganic filler based on silicon dioxide preferably contains SiO₂ or Si₃Al at 70% by weight or more, and more preferably at 80% by weight or more. Examples of inorganic fillers based on silicon dioxide (C) include silicon dioxide, clay, talc, mica, diatomaceous earth, wollastonite, montmorillonite, zeolite, glass fiber and other inorganic fiber materials, etc. Furthermore, inorganic fillers based on silicon dioxide with hydrophobic surfaces and mixtures of inorganic fillers based on silicon dioxide and non-silicon dioxide-based inorganic fillers can also be used. From the perspective of strength, wear resistance, etc., silicon dioxide and glass fibers are preferred among these materials, with silicon dioxide being more preferred. Examples of silicon dioxide include dry silicon dioxide, moist silicon dioxide, synthetic silicon dioxide, etc. Moist silicon dioxide is preferred among these. The dry silicon dioxide mentioned above refers, for example, to a dry silicon dioxide obtained by reacting purified silicon tetrachloride in a high-temperature flame. Compared to wet silicon dioxide, this dry silicon dioxide has a high purity, a fine particle size, and an extremely low moisture content. It is widely used as a filler for silicone rubber, a thickener for resins, a reinforcing agent, a fluidizing agent for powders, and a raw material for ceramics. The wet silicon dioxide mentioned above is, for example, a light white powder with a fluffy appearance, obtained by precipitating silicon dioxide through neutralization of an aqueous solution containing sodium silicate as a raw material containing quartz sand, and then filtering / drying it. It is generally used as a reinforcing filler for synthetic rubber, for powdering and preventing solidification of liquids such as agricultural chemicals, etc., to prevent printing inks from backing onto light paper, for paints, to prevent thickening / tarnishing of printing inks, for insulating materials, and for polishing agents. In the conjugated diene-based polymer composition of the present embodiment, from the point of view of achieving better rolling resistance properties, the specific nitrogen adsorption surface area determined by the BET adsorption method of the inorganic filler based on silicon dioxide is preferably 100 to 300 m2 / g and more preferably 170 to 250 m2 / g. (Soot) In the conjugated diene-based polymer composition of the present embodiment, it is preferred, from the point of view of the enhancement of the tensile properties, etc., that it further contains, in addition to the inorganic filler based on silicon dioxide (C), 0.5 to 100 parts by mass of carbon black, wherein the total amount of the rubber component (A) and the rubber component (B) is assumed to be 100 parts by mass. The carbon black is not particularly restricted and can be any class of carbon black such as SRF, FEF, HAF, ISAF, SAF, etc. Among these, carbon black with a nitrogen adsorption surface area of ​​50 m² / g or more and a dibutyl phthalate (DBP) oil absorption of 80 mL / 100 g or more is preferred with regard to extrusion formability and rolling resistance properties. From the perspective of balancing rolling resistance properties, extrusion processability and cut strength, the amount of carbon black mixture is preferably 0.5 to 100 parts by mass, more preferably 3 to 100 parts by mass, and even more preferably 5 to 50 parts by mass, wherein the total amount of the rubber component (A) and the rubber component (B) is assumed to be 100 parts by mass. (Metal oxide, metal hydroxide) The conjugated diene-based polymer composition of the present embodiment may contain, in addition to an inorganic filler based on silicon dioxide and carbon black, a metal oxide or a metal hydroxide. A metal oxide refers to a solid particle containing the chemical formula MxOy (where M represents a metal atom and x and y are independent integers from 1 to 6) as the main component of its constituent unit. Examples include aluminum oxide, titanium oxide, magnesium oxide, zinc oxide, etc. Mixtures of metal oxides and inorganic fillers that are not metal oxides can also be used. The metal hydroxide is not particularly limited in scope, and examples include aluminum hydroxide, magnesium hydroxide, zirconium hydroxide, etc. The method for identifying the type and content ratio of rubber components contained in the conjugated diene-based polymer composition of the present embodiment is not particularly limited, but can be identified using NMR. For example, in a previous report (JSR TECHNICAL REVIEW No. 126 / 2019), a quantitative calculation of the ratio of the styrene units, 1,2-vinyl, 1,4-vinyl, 1,4-cis bond and the isoprene units included in the conjugated diene-based polymer composition can be performed using solid-state13C-NMR. (Silane coupling agent) The conjugated diene-based polymer composition of the present formulation contains a silane coupling agent. The silane coupling agent has an affinity or bonding group for each of the rubber component, the rubber-like polymer, and the silicon dioxide-based inorganic filler, and its function is to enhance the interaction between the respective components. Generally, compounds with a sulfur bonding moiety and an alkoxysilyl group or a silanol group moiety in a single molecule are used. Silane coupling agents are used, for example, B. listed, but not limited to: 3-mercaptopropyltrimethoxysilane, 3-mercaptopropylethoxysilane, 2-mercaptoethyltrimethoxysilane, 2-mercaptoethyltriethoxysilane, ethoxy(3-mercaptopropyl)bis(3,6,9,12,15-pentaoxaoctacosane-1-illoxy)silane [manufactured by Evonik Degussa: Si363], silane coupling agents manufactured by Momentives, containing mercapto groups such as NXT-Z30, NXT-Z45, NXTZ60 and NXT Silane, bis-[3-(triethoxysilyl)-propyl]tetrasulfide, bis-[3-(triethoxysilyl)-propyl]disulfide, bis-[2-(triethoxysilyl)-ethyl]tetrasulfide, bis(3-triethoxysilylpropyl)trisulfide, Bis-[2-(triethoxysilyl)ethyl]tetrasulfide, bis(3-timethoxysilylpropyl)tetrasulfide, bis(2-trimethoxysilylethyl)tetrasulfide, 3-mercaptopropyltrimethoxysilane, 3-mercaptopropyltriethoxysilane, 2-mercaptoethyltrimethoxysilane, 2-mercaptoethyltriethoxysilane, 3-Trimethoxysilylpropyl-N,N-dimethylthiocarbamoyltetrasulfide, 3-triethoxysilylpropyl-N,N-dimethylthiocarbamoyltetrasulfide,2-Triethoxysilylethyl-N,N-dimethylthiocarbamoyltetrasulfide, 3-Trimethoxysilylpropylbenzothiazolyltetrasulfide, 3-Triethoxysilylpropylbenzolyltetrasulfide, 3-Triethoxysilylpropylmethacrylate monosulfide, 3-Trimethoxysilylpropylmethacrylate monosulfide, Bis(3-diethoxymethylsilylpropyl)tetrasulfide, 3-Mercaptopropyldimethoxymethylsilane, Dimethoxymethylsilylpropyl-N,N-dimethylthiocarbamoyltetrasulfide, Dimethoxymethylsilylpropylbenzothiazolyltetrasulfide, etc. Among them, from the point of view of high potentiation, are Bis-[3-(triethoxysilyl)-propyl]-disulfide, Ethoxy(3-mercaptopropyl)bis(3,6,9,12,15-pentaoxaoctacosan-1-yloxy)silane [manufactured by Evonik Degussa]. Si363], silane coupling agents manufactured by Momentives, containing mercapto groups such as NXT-Z®30, NXT-Z®45, NXT-Z®60, NXT silane, and preferably bis-[3-(triethoxysilyl)propyl]tetrasulfide. These silane coupling agents can be used alone or in combination with two or more of them. The amount of the silane coupling agent, in order to make the effect of the reinforcing interaction between the respective rubber component and the inorganic filler based on silicon dioxide more pronounced, is preferably 0.1 to 30 parts by mass, more preferably 0.5 to 20 parts by mass, and even more preferably 1 to 15 parts by mass, wherein the total amount of the rubber component (A) and the rubber component (B) is assumed to be 100 parts by mass. (Rubber plasticizer) The conjugated diene-based polymer composition of the present embodiment can contain a rubber plasticizer to improve processability. Suitable rubber plasticizers include, for example, a mineral oil-based rubber plasticizer and a liquid or low-molecular-weight synthetic plasticizer. The aforementioned mineral oil-based rubber plasticizers are also referred to as process oils or extender oils and serve to soften the rubber, increase its volume, and improve its processability.Furthermore, the above-mentioned mineral oil-based rubber plasticizers are mixtures of aromatic rings, naphthene rings, and paraffin chains. Those in which the carbon number of the paraffin chain is 50% or more of the total carbon are termed paraffinic, those in which the carbon number of the naphthene ring is 30 to 45% are termed naphthenic, and those in which the aromatic carbon number is 30% or more are termed aromatic. For use with modified conjugated diene-aromatic vinyl copolymers, a plasticizer with a moderate aromatic content is preferred because it tends to exhibit good affinity for the copolymer. The amount of the rubber plasticizer in the mixture, based on 100 parts by mass of the total amount of the rubber component (A) and the rubber component (B), is preferably 0 to 100 parts by mass, more preferably 10 to 90 parts by mass, and even more preferably 30 to 90 parts by mass. By setting the amount of the rubber plasticizer in the mixture to 100 parts by mass or less, based on 100 parts by mass of the total amount of the rubber components (A) and (B), the occurrence of bleeding can be suppressed and the occurrence of stickiness on the surface of the conjugated diene-based polymer composition can be prevented. (kneading process) The method for mixing the components of the conjugated diene-based polymer composition of the present embodiment, such as the rubber components including the conjugated diene-based polymers (A), (B), inorganic fillers based on silicon dioxide, carbon black and other fillers, silane coupling agents and rubber plasticizers, is not limited to the following, but includes, for example, a melt kneading process using a general mixer, such as an open roller, a Banbury mixer, a kneader, a single-screw extruder, a twin-screw extruder, a multi-screw extruder, and the like, as well as a method for heating and removing the solvent after melting and mixing each component. Among these, the hot melt kneading process using a roller, a Bunbury mixer, kneader, or extruder is preferred from the perspective of productivity and good kneading performance. Furthermore, both a process for kneading the components of the rubber composition of the present embodiment in a single step and a process for mixing the components multiple times are applicable. The conjugated diene-based polymer composition of the present embodiment can be a vulcanized composition that has been subjected to vulcanization with a vulcanizing agent. Although the vulcanizing agent is not limited to the following, examples include radical initiators such as organic peroxides, as well as azo compounds, oxime compounds, nitroso compounds, polyamine compounds, sulfur, and sulfur compounds. Sulfur compounds include sulfur monochloride, sulfur dichloride, disulfide compounds, polymeric polysulfide compounds, etc. The vulcanizing agent content, based on 100 parts by mass of the rubber component (A) and the rubber component (B), including the conjugated diene-based polymer (A1), is preferably 0.01 parts by mass or more and 20 parts by mass or less, and more preferably 0.1 parts by mass or more and 15 parts by mass or less. A conventionally known vulcanization process can be used, wherein the vulcanization temperature is preferably 120°C or more and 200°C or less, and more preferably 140°C or more and 180°C or less. A vulcanization accelerator can be used during vulcanization if necessary. Conventionally known materials can be used as vulcanization accelerators, including, but not limited to, sulfenamide, guanidine, thiuram, aldehyde amine, aldehyde ammonia, thiazole, thiourea and dithiocarbamate. Furthermore, zinc oxide and stearic acid are mentioned as vulcanizing aids, but are not limited to these. The content of the vulcanization accelerator, based on 100 parts by mass of the rubber component (A) and the rubber component (B) including the conjugated diene-based polymer (A1), is preferably 0.01 parts by mass or more and 20 parts by mass or less and more preferably 0.1 parts by mass or more and 15 parts by mass or less. In the conjugated diene-based polymer composition of the present embodiment, various additives such as plasticizers, fillers, heat stabilizers, antistatic agents, weathering stabilizers, anti-aging agents, colorants and lubricants, in addition to those mentioned above, may be used to the extent that the purpose of the present embodiment is not impaired. Other known plasticizers can be used. Other fillers specifically mentioned include calcium carbonate, magnesium carbonate, aluminum sulfate and barium sulfate. Any of the above-mentioned heat stabilizers, antistatic agents, weatherproofing agents, anti-aging agents, dyes and lubricants can be used as known materials. [Tires] The conjugated diene-based polymer composition of the present embodiment is suitably used as a rubber composition for tires. That is, the tire of the present embodiment is manufactured using the conjugated diene-based polymer composition of the present embodiment. Although the conjugated diene-based polymer compositions for tires of the present embodiment are not limited to the following, they can be used for respective parts of tires, such as for various tires like fuel-saving tires, all-season tires, high-performance tires, studless tires: treads, carcasses, sidewalls and bead parts. In particular, the rubber composition is used for tires that are more suitable for the tread of fuel-saving tires and high-performance tires, as it, being a vulcanizate, has an excellent balance between low hysteresis loss and wet performance, as well as excellent wear resistance. [Examples of implementation] The present embodiment will be explained in more detail below by providing specific exemplary embodiments and comparative examples. Various material properties in the exemplary embodiments and comparative examples were measured using the methods shown below. In the following embodiments and comparative examples, the conjugated diene-based polymer is referred to as "modified conjugated diene-based polymer" after modification. If it is unmodified, it is referred to as "unmodified conjugated diene-based polymer." Furthermore, a generic term for both modified and unmodified conjugated diene-based polymers can also be "conjugated diene-based polymer." (Material property 1) Amount of bound styrene Using a modified conjugated diene-based polymer as a sample, 100 mg of the sample was made up to 100 mL with chloroform and dissolved to prepare a measurement sample. The amount of bound styrene (wt%) relative to 100 wt% of the modified conjugated diene-based polymer as the sample was measured from the absorption of the ultraviolet absorption wavelength (around 254 nm) by the phenyl group of styrene (spectrophotometer “UV-2450”, manufactured by Shimadzu Co.). (Material property 2) Microstructure of the butadiene moiety (amount of 1,2-vinyl bond) Using the modified conjugated diene-based polymer as a sample, 50 mg of the sample was dissolved in 10 mL of carbon disulfide for the measurement sample. Using a solution cell, an infrared spectrum in the range of 600-1000 cm-1 was measured, and according to the calculation formula of the Hampton method (RR Hampton, method given in Analytical Chemistry 21, 923 (1949)) the microstructure of the butadiene fraction, i.e. the amount of 1,2-vinyl bonds (mol%), was determined by absorption at a predetermined wavenumber (Fourier transform infrared spectrophotometer “FT-IR230”, manufactured by JASCO Co.). (Material property 3) Molecular weight Measurement condition 1: The sample used was either unmodified conjugated diene-based polymer or modified conjugated diene-based polymer, and a GPC instrument (manufactured by Tosoh Co., trade name “HLC-8320GPC”) consisting of three interconnected columns packed with polystyrene gel as filler was used, with the chromatograms being measured using an RI detector (manufactured by Tosoh Co., trade name “HLC8020”), and the weight mean molecular weight (Mw) and number mean molecular weight (Mn) as well as the molecular weight distribution (Mw / Mn) being determined based on the calibration curve obtained with standard polystyrene. THF (tetrahydrofuran) with triethylamine at 5 mmol / L was used as the eluent. Three columns, trade name "TSKgel® SuperMultiporeHZ-H", manufactured by Tosoh Co., were joined together, and one column, trade name "TSKguardcolumn SuperMP (HZ)-H", also manufactured by Tosoh Co., was joined and used as a protective column in the pre-stage. 10 mg of the sample to be measured was dissolved in 10 mL of THF to prepare a measuring solution, and 10 µL of the measuring solution was injected into the GPC measuring device and the measurement was carried out under conditions of an oven temperature of 40°C and a THF flow rate of 0.35 mL / min. Of the various samples measured under measurement condition 1 above, those with a molecular weight distribution (Mw / Mn) value of less than 1.6 were remeasured under measurement condition 2 below. For samples measured under measurement condition 1 with a molecular weight distribution value of 1.6 or higher, the results of the measurements under measurement condition 1 are shown in Tables 1 to 3. Measurement condition 2: Using unmodified conjugated diene-based polymers or modified conjugated diene-based polymers as samples, the chromatogram was measured with a GPC instrument with three connected columns packed with polystyrene-based gels as filler, and the weight mean molecular weight (Mw) and number mean molecular weight (Mn) were determined based on a calibration curve using standard polystyrene. The eluent used was 5 mmol / L THF with triethylamine. The following columns were used: protective column (trade name "TSKguardcolumn SuperH-H", manufactured by Tosoh Co.), and columns (trade names "TSKgel® SuperH5000", "TSKgel® SuperH6000" and "TSKgel® SuperH7000", manufactured by Tosoh Co.). Under conditions of an oven temperature of 40°C and a THF flow rate of 0.6 ml / min, an RI detector (trade name "HLC8020", manufactured by Tosoh Co.) was used. 10 mg of the sample to be measured was dissolved in 20 mL of THF to prepare a measuring solution, 20 µL of the measuring solution was injected into the GPC meter, and the measurement was performed. For samples measured under measurement condition 1 and whose molecular weight distribution value was less than 1.6, the results of the measurements under measurement condition 2 are shown in Tables 1 to 3. (Material property 4) Contraction factor (g') Using modified conjugated diene-based polymers as samples, a GPC analyzer (trade name "GPCmax VE-2001", manufactured by Malvern) was employed, in which three columns were connected with a polystyrene gel as filler. Measurements were performed with three detectors: a light scattering detector, an RI detector, and a viscosity detector (trade name "TDA305", manufactured by Malvern) connected in series. Based on standard polystyrene, the absolute molecular weight was determined from the measurements of the light scattering detector and the RI detector, and the intrinsic viscosity was determined from the measurements of the RI detector and the viscosity detector. Linear chain polymers were used, assumed to follow the intrinsic viscosity [η] = -3.883 M0.771, where the contraction factor (g') was calculated as the ratio of the intrinsic viscosity corresponding to the respective molecular weight. 5 mmol / L THF with triethylamine was used as the eluent. The columns used were the trade names “TSKgel® G4000HXL”, “TSKgel® G5000HXL” and “TSKgel® G6000HXL”, manufactured by Tosoh Co. 20 mg of the sample to be measured was dissolved in 10 mL of THF to prepare a measuring solution, 100 µL of the measuring solution was injected into the GPC measuring device and the measurement was carried out under conditions of an oven temperature of 40°C and a THF flow rate of 1 mL / min. (Material property 5) Polymer Mooney viscosity Using unmodified conjugated diene-based polymer or modified conjugated diene-based polymer as the sample, a Mooney viscometer (trade name “VR1132”, manufactured by Ueshima Seisakusho Co., Ltd.) was used and the Mooney viscosity was measured according to JIS K6300 and with an L-shaped rotor. The measurement temperature was set to 110°C for an unmodified conjugated diene-based polymer sample and to 100°C for a modified conjugated diene-based polymer sample. First, the sample was preheated to the test temperature for 1 minute, then the rotor was turned at 2 rpm and after 4 minutes the torque was measured to determine the Mooney viscosity (ML(1+4)). (Material property 6) Glass transition temperature (Tg) Using the modified conjugated diene-based polymer as a sample, the DSC curve was recorded using a differential scanning calorimeter “DSC3200S”, manufactured by Max Science, according to ISO 22768:2006, under a distribution of 50 mL / min helium and an increase in temperature from -100°C to 20°C / min, whereby the inflection point of the DSC derivative curve was determined as the glass transition temperature. (Material property 7) Degree of modification A modified conjugated diene-based polymer was used as a sample, and the measurement was performed by applying a property of the adsorption of the modified basic polymer component to a GPC column with a silica gel as a filler. The amount of adsorption on the silica column was measured from the difference between the chromatogram measured with the polystyrene column and the chromatogram measured with the silica column of the sample solution containing the sample and the internal standard low molecular weight polystyrene, and the degree of modification was determined. Specifically, the procedure is as follows: Furthermore, for the sample measured under the above measurement condition 1 (material property 3) with a molecular weight distribution value of 1.6 or higher, the measurement was performed under the following measurement condition 3. For the sample measured under the above measurement condition 1 (material property 3) with a molecular weight distribution value of less than 1.6, the measurement was performed under the following measurement condition 4. The results are shown in Tables 1 to 3. Sample solution preparation: 10 mg of the sample and 5 mg of standard polystyrene were dissolved in 20 mL of THF to prepare a sample solution. Measurement condition 3: GPC measurement conditions using a polystyrene column: Using trade name "HLC-8320GPC" manufactured by Tosoh Co., 5 mmol / L THF with triethylamine as the eluent was used, 10 µL of the sample solution was injected into the instrument, and chromatograms were obtained under conditions of a column oven temperature of 40°C and a THF flow rate of 0.35 mL / min using an RI detector. Three trade names “TSKgel® SuperMultiporeHZ-H”, manufactured by Tosoh Co., were connected as a column, and one trade name “TSKguardcolumn SuperMP (HZ)-H”, manufactured by Tosoh Co., was connected and used in the pre-stage as a protective column. Measurement condition 4: GPC measurement conditions with a polystyrene column: Using the trade name “HLC-8320GPC”, manufactured by Tosoh Co., and using 5 mmol / L THF with triethylamine as eluent, 20 µL of the sample solution was injected into the instrument and the measurement was performed. The following columns were used: protective column (trade name "TSKguardcolumn SuperH-H", manufactured by Tosoh Co.), and columns (trade names "TSKgel® SuperH5000", "TSKgel® SuperH6000", and "TSKgel® SuperH7000", manufactured by Tosoh Co.). Measurements were performed under conditions of a column oven temperature of 40°C and a THF flow rate of 0.6 mL / min using an RI detector (HLC8020, manufactured by Tosoh Co.), and chromatograms were obtained. GPC measurement conditions using a silica column: Using the trade name "HLC-8320GPC" manufactured by Tosoh Co., 50 µL of the sample solution with THF as eluent was injected into the instrument, and chromatograms were obtained under conditions of a column oven temperature of 40°C and a THF flow rate of 0.5 ml / min using an RI detector. The columns used were the trade names "Zorbax® PSM-1000S", "PSM-300S", and "PSM-60S", and a trade name "DIOL 4.6 × 12.5 mm 5 micron" was used as a protective column in the preliminary stage. Calculation method for the degree of modification: The degree of modification (%) was determined according to the formula below, where the total peak area of ​​the chromatogram using a polystyrene column is assumed to be 100, the peak area of ​​the sample to be P1, and the peak area of ​​standard polystyrene to be P2, as well as the total peak area of ​​the chromatogram using a silica column to be 100, the peak area of ​​the sample to be P3, and the peak area of ​​standard polystyrene to be P4: (where P1 + P2 = P3 + P4 = 100) (Material property 8) Degree of branching (Bn) Using a modified conjugated diene-based polymer as a sample, a GPC analyzer (trade name "GPCmax VE-2001", manufactured by Malvern) was employed, consisting of three interconnected columns packed with polystyrene gel as filler. Measurements were performed with three detectors connected in series: a light scattering detector, a refractive index (RI) detector, and a viscosity detector (trade name "TDA305" by Malvern). Based on standard polystyrene, the absolute molecular weight was determined from the results of the light scattering detector and the RI detector, and the intrinsic viscosity was determined from the results of the RI detector and the viscosity detector. Linear chain polymers were used, assumed to follow the intrinsic viscosity [η] = -3.883 M0.771, where the contraction factor (g') was calculated as the ratio of the intrinsic viscosity corresponding to the respective molecular weight. The obtained contraction factor (g') was then used to calculate the degree of branching (Bn), which is defined as g' = 6Bn / { (Bn+1) (Bn+2)}. 5 mmol / L THF with triethylamine was used as the eluent. The product names “TSKgel® G4000HXL”, “TSKgel® G5000HXL” and “TSKgel® G6000HXL”, manufactured by Tosoh Co., were combined and used as the pillar. 20 mg of the sample to be measured was dissolved in 10 mL of THF to prepare a measuring solution, 100 µL of the measuring solution was injected into the GPC measuring device and the measurement was carried out under conditions of an oven temperature of 40°C and a THF flow rate of 1 mL / min. (Material property 8) Molecular weight (absolute molecular weight) by GPC light scattering measurement Using a modified conjugated diene-based polymer as a sample, a GPC light scattering instrument consisting of three interconnected columns packed with polystyrene gel as filler was used, measuring the chromatograms and determining the weight mean molecular weight (Mw-i) (also called "absolute molecular weight") based on the solution viscosity and the light scattering method. A mixed solution of tetrahydrofuran and triethylamine was used as the eluent (THF in TEA: 5 mL of triethylamine was mixed with 1 L of tetrahydrofuran for preparation). The protective column "TSKguardcolumn HHR-H", manufactured by Tosoh Co., was connected and used with columns "TSKgel® G6000HHR", "TSKgel® G5000HHR" and "TSKgel® G4000HHR", manufactured by Tosoh Co.). Under conditions of an oven temperature of 40°C and a THF flow rate of 1.0 mL / min, a GPC light scattering meter (trade name “Viscotek TDAmax”, manufactured by Malvern) was used. 10 mg of the sample to be measured was dissolved in 20 mL of THF to prepare a measuring solution, 200 µL of the measuring solution was injected into the GPC measuring device, and the measurement was performed. [Conjugated diene-based polymer] (Modified conjugated diene-based polymer (Sample 1)) Two tank-shaped pressure vessels were connected as polymerization reactors, each with a stirring machine and a jacket for temperature control. These tank-shaped reactors with a stirring machine have an internal volume of 10 L, an internal height (L) to diameter (D) ratio of 4.0, and an inlet at the bottom and an outlet at the top. Moisture was removed beforehand, and 1,3-butadiene was mixed at 18.6 g / min, styrene at 10.0 g / min, and n-hexane at 175.2 g / min. In a static mixer installed in the middle of the pipes supplying the mixed solution to the reactor inlet, n-butyllithium was added at 0.103 mmol / min for the inactivation treatment of the remaining impurities and mixed in, then continuously fed to the bottom of the reactor. Furthermore, 2,2-bis(2-oxolanyl)propane, as a polarizer, was added at a rate of 0.081 mmol / min, and n-butyllithium, as a polymerization initiator, was added at a rate of 0.143 mmol / min to the bottom of the first reactor, where vigorous mixing was carried out using a stirrer, while the reactor temperature was maintained at 67°C. The polymer solution was continuously drawn off from the top of the first reactor and fed to the bottom of the second reactor. The reaction was continued at 70°C, and the solution was also fed from the top of the second reactor to the static mixer. When the polymerization was sufficiently stable, trimethoxy(4-vinylphenyl)silane (abbreviated as "BS-1" in the table) was added from the bottom of the second reactor as a branching agent at a rate of 0.0190 mmol / min. Once the polymerization and branching reactions were stabilized, a small amount of the conjugated diene-based polymer solution was extracted before the addition of the modifier. The antioxidant (BHT) was added at a rate of 0.2 g per 100 g of polymer. The solvent was then removed, and the Mooney viscosity at 110°C and various molecular weights were measured.Further material properties are also shown together in Table 1. Next, the polymer solution flowing from the reactor outlet was continuously modified with 2,2-dimethoxy-1-(3-trimethoxysilylpropyl)-1-aza-2-silacyclopentane (abbreviated as "A" in the table) at a rate of 0.0360 mmol / min. This mixture was then mixed and modified using a static mixer. The time until the modifier was added to the polymerization solution flowing from the reactor outlet was 4.8 minutes, the temperature was 68°C, and the temperature difference between the polymerization temperature and the temperature before the modifier was 2°C. An antioxidant (BHT) was continuously added to the modified polymer solution at 0.055 g / min (n-hexane solution) at a rate of 0.2 g per 100 g of polymer to terminate the modification reaction. Simultaneously with the antioxidant, oil (JOMO Process NC140, manufactured by JX Nippon Oil & Energy Co.) was continuously added.) in an amount of 37.5 g per 100 g of the polymer and mixed with a static mixer. The solvent was removed by steam stripping to obtain a modified conjugated diene-based polymer (Sample 1). The material properties of Sample 1 are shown in Table 1. (Modified conjugated diene-based polymer (Sample 2)) With the exception that the modifier was changed from 2,2-dimethoxy-1-(3-trimethoxysilylpropyl)-1-aza-2-silacyclopentane to tris(3-trimethoxysilylpropyl)amine (abbreviated as "B" in the table), and the addition rate was changed to 0.0250 mmol / min, a modified conjugated diene-based polymer (Sample 2) was obtained in the same manner as in Sample 1. The material properties of Sample 2 are shown in Table 1. (Modified conjugated diene-based polymer (Sample 3)) With the exception that the modifier was changed from 2,2-dimethoxy-1-(3-trimethoxysilylpropyl)-1-aza-2-silacyclopentane to tetrakis(3-trimethoxysilylpropyl)-1,3-propanediamine (abbreviated as "C" in the table), and the addition rate was changed to 0.0190 mmol / min, a modified conjugated diene-based polymer (Sample 3) was obtained in the same manner as in Sample 1. The material properties of Sample 3 are shown in Table 1. (Modified conjugated diene-based polymer (Sample 4)) With the exception that the modifier was changed from 2,2-dimethoxy-1-(3-trimethoxysilylpropyl)-1-aza-2-silacyclopentane to tetrakis(3-trimethoxysilylpropyl)-1,3-propanediamine (abbreviated as "C" in the table), and the addition rate was changed to 0.0160 mmol / min, a modified conjugated diene-based polymer (Sample 4) was obtained in the same manner as in Sample 1. The material properties of Sample 4 are shown in Table 1. (Modified conjugated diene-based polymer (Sample 5)) With the exception that the branching agent was changed from trimethoxy(4-vinylphenyl)silane to dimethylmethoxy(4-vinylphenyl)silane (abbreviated as "BS-2" in the table), and the addition rate was changed to 0.0350 mmol / min, a modified conjugated diene-based polymer (Sample 5) was obtained in the same manner as (Sample 1). The material properties of Sample 5 are shown in Table 1. (Modified conjugated diene-based polymer (Sample 6)) With the exception that the branching agent was changed from trimethoxy(4-vinylphenyl)silane to dimethylmethoxy(4-vinylphenyl)silane (abbreviated as "BS-2" in the table), and the addition rate was changed to 0.0350 mmol / min, and the modifier was changed from 2,2-dimethoxy-1-(3-trimethoxysilylpropyl)-1-aza-2-silacyclopentane to tris(3-trimethoxysilylpropyl)amine (abbreviated as "B" in the table), and the addition rate was changed to 0.0250 mmol / min, a modified conjugated diene-based polymer (Sample 6) was obtained in the same manner as in Sample 1. The material properties of Sample 6 are shown in Table 1. (Modified conjugated diene-based polymer (Sample 7)) With the exception that the branching agent was changed from trimethoxy(4-vinylphenyl)silane to dimethylmethoxy(4-vinylphenyl)silane (abbreviated as "BS-2" in the table), and the addition rate was changed to 0.0350 mmol / min, and the modifier was changed from 2,2-dimethoxy-1-(3-trimethoxysilylpropyl)-1-aza-2-silacyclopentane to tetrakis(3-trimethoxysilylpropyl)-1,3-propanediamine (abbreviated as "C" in the table), and the addition rate was changed to 0.0160 mmol / min, a modified conjugated diene-based polymer (Sample 7) was obtained in the same manner as in Sample 1. The material properties of Sample 7 are shown in Table 1. (Modified conjugated diene-based polymer (Sample 8)) With the exception that the branching agent was changed from trimethoxy(4-vinylphenyl)silane to 1,1-bis(4-(dimethylmethoxysilyl)phenyl)ethylene (abbreviated as "BS-3" in the table) and the addition rate was changed to 0.0120 mmol / min, a modified conjugated diene-based polymer (Sample 8) was obtained in the same manner as in Sample 1. The material properties of Sample 8 are shown in Table 1. (Modified conjugated diene-based polymer (Sample 9)) With the exception that the branching agent was changed from trimethoxy(4-vinylphenyl)silane to 1,1-bis(4-(dimethylmethoxysilyl)phenyl)ethylene (abbreviated as "BS-3" in the table), and the addition rate of the modifier was changed to 0.0120 mmol / min, and the modifier was changed from 2,2-dimethoxy-1-(3-trimethoxysilylpropyl)-1-aza-2-silacyclopentane to tris(3-trimethoxysilylpropyl)amine (abbreviated as "B" in the table), and the addition rate was changed to 0.0250 mmol / min, a modified conjugated diene-based polymer (Sample 9) was obtained in the same manner as in Sample 1. The material properties of Sample 9 are shown in Table 1. (Modified conjugated diene-based polymer (Sample 10)) With the exception that the branching agent was changed from trimethoxy(4-vinylphenyl)silane to 1,1-bis(4-(dimethylmethoxysilyl)phenyl)ethylene (abbreviated as "BS-3" in the table), and the addition rate of the modifier was changed to 0.0120 mmol / min, and the modifier was changed from 2,2-dimethoxy-1-(3-trimethoxysilylpropyl)-1-aza-2-silacyclopentane to tetrakis(3-trimethoxysilylpropyl)-1,3-propanediamine (abbreviated as "C" in the table), and the addition rate was changed to 0.0160 mmol / min, a modified conjugated diene-based polymer (Sample 10) was obtained in the same manner as (Sample 1). The material properties of Sample 10 are shown in Table 1. (Modified conjugated diene-based polymer (Sample 11)) With the exception that the branching agent was changed from trimethoxy(4-vinylphenyl)silane to 1,1-bis(4-trimethoxysilylphenyl)ethylene (abbreviated as "BS-4" in the table) and the addition rate was changed to 0.0210 mmol / min, a modified conjugated diene-based polymer (Sample 11) was obtained in the same manner as in Sample 1. The material properties of Sample 11 are shown in Table 2. (Modified conjugated diene-based polymer (Sample 12)) With the exception that the branching agent was changed from trimethoxy(4-vinylphenyl)silane to 1,1-bis(4-trimethoxysilylphenyl)ethylene (abbreviated as "BS-4" in the table), and the addition rate was changed to 0.0210 mmol / min, and the modifier was changed from 2,2-dimethoxy-1-(3-trimethoxysilylpropyl)-1-aza-2-silacyclopentane to tris(3-trimethoxysilylpropyl)amine (abbreviated as "B" in the table), and the addition rate was changed to 0.0250 mmol / min, a modified conjugated diene-based polymer (Sample 12) was obtained in the same manner as in Sample 1. The material properties of Sample 12 are shown in Table 2. (Modified conjugated diene-based polymer (Sample 13)) With the exception that the branching agent was changed from trimethoxy(4-vinylphenyl)silane to 1,1-bis(4-trimethoxysilylphenyl)ethylene (abbreviated as "BS-4" in the table), and the addition rate was changed to 0.0210 mmol / min, and the modifier was changed from 2,2-dimethoxy-1-(3-trimethoxysilylpropyl)-1-aza-2-silacyclopentane to tetrakis(3-trimethoxysilylpropyl)-1,3-propanediamine (abbreviated as "C" in the table), and the addition rate was changed to 0.0160 mmol / min, a modified conjugated diene-based polymer (Sample 13) was obtained in the same manner as in Sample 1. The material properties of Sample 13 are shown in Table 2. (Modified conjugated diene-based polymer (Sample 14)) With the exception that the branching agent was changed from trimethoxy(4-vinylphenyl)silane to trichloro(4-vinylphenyl)silane (abbreviated as "BS-5" in the table), a modified conjugated diene-based polymer (Sample 14) was obtained in the same manner as (Sample 1). The material properties of Sample 14 are shown in Table 2. (Modified conjugated diene-based polymer (Sample 15)) With the exception that the branching agent was changed from trimethoxy(4-vinylphenyl)silane to trichloro(4-vinylphenyl)silane (abbreviated as "BS-5" in the table), and the modifier was changed from 2,2-dimethoxy-1-(3-trimethoxysilylpropyl)-1-aza-2-silacyclopentane to tris(3-trimethoxysilylpropyl)amine (abbreviated as "B" in the table), and the addition rate was changed to 0.0250 mmol / min, a modified conjugated diene-based polymer (Sample 15) was obtained in the same manner as in Sample 1. The material properties of Sample 15 are shown in Table 2. (Modified conjugated diene-based polymer (Sample 16)) With the exception that the branching agent was changed from trimethoxy(4-vinylphenyl)silane to trichloro(4-vinylphenyl)silane (abbreviated as "BS-5" in the table), and the modifier was changed from 2,2-dimethoxy-1-(3-trimethoxysilylpropyl)-1-aza-2-silacyclopentane to tetrakis(3-trimethoxysilylpropyl)-1,3-propanediamine (abbreviated as "C" in the table), and the addition rate was changed to 0.0160 mmol / min, a modified conjugated diene-based polymer (Sample 16) was obtained in the same manner as in Sample 1. The material properties of Sample 16 are shown in Table 2. (Modified conjugated diene-based polymer (Sample 17)) With the exception that the amount of trimethoxy(4-vinylphenyl)silane (abbreviated as "BS-1" in the table) added as a branching agent was changed to 0.0100 mmol / min, and the modifier was changed from 2,2-dimethoxy-1-(3-trimethoxysilylpropyl)-1-aza-2-silacyclopentane to tetrakis(3-trimethoxysilylpropyl)-1,3-propanediamine (abbreviated as "C" in the table), and the amount added was changed to 0.0160 mmol / min, a modified conjugated diene-based polymer (Sample 17) was obtained in the same manner as in Sample 1. The material properties of Sample 17 are shown in Table 2. (Modified conjugated diene-based polymer (Sample 18)) With the exception that the amount of trimethoxy(4-vinylphenyl)silane (abbreviated as "BS-1" in the table) added as a branching agent was changed to 0.0250 mmol / min, and the modifier was changed from 2,2-dimethoxy-1-(3-trimethoxysilylpropyl)-1-aza-2-silacyclopentane to tetrakis(3-trimethoxysilylpropyl)-1,3-propanediamine (abbreviated as "C" in the table), and the amount added was changed to 0.0160 mmol / min, a modified conjugated diene-based polymer (Sample 18) was obtained in the same manner as in Sample 1. The material properties of Sample 18 are shown in Table 2. (Modified conjugated diene-based polymer (Sample 19)) With the exception that the amount of trimethoxy(4-vinylphenyl)silane (abbreviated as "BS-1" in the table) added as a branching agent was changed to 0.0350 mmol / min, and the modifier was changed from 2,2-dimethoxy-1-(3-trimethoxysilylpropyl)-1-aza-2-silacyclopentane to tetrakis(3-trimethoxysilylpropyl)-1,3-propanediamine (abbreviated as "C" in the table), and the amount added was changed to 0.0160 mmol / min, a modified conjugated diene-based polymer (Sample 19) was obtained in the same manner as in Sample 1. The material properties of Sample 19 are shown in Table 2. (Conjugated diene-based polymer (Sample 20)) With the exception that the modifier was changed from 2,2-dimethoxy-1-(3-trimethoxysilyl-propyl)-1-aza-2-silacyclopentane to tetraethoxysilane (abbreviated as "D" in the table) as the coupling agent, and the addition rate was changed to 0.0250 mmol / min, a conjugated diene-based polymer (sample 20) was obtained in the same manner as (sample 1). The material properties of sample 20 are shown in Table 2. (Conjugated diene-based polymer (Sample 21)) With the exception that no modifier was added, an unmodified conjugated diene-based polymer (sample 21) was obtained in the same manner as in (sample 1). The material properties of sample 21 are shown in Table 2. Table 2 lists the amount of bound styrene, the amount of vinyl bonds, the glass transition temperature, the degree of branching, and the absolute molecular weight in the columns of the modified conjugated diene-based polymers. (Modified conjugated diene-based polymer (Sample 22)) Two tank-shaped pressure vessels were connected as polymerization reactors, each with a stirring machine and a jacket for temperature control. These tank-shaped reactors with a stirring machine have an internal volume of 10 L, an internal height (L) to diameter (D) ratio of 4.0, and an inlet at the bottom and an outlet at the top. Moisture was removed beforehand, and 1,3-butadiene was mixed at 18.6 g / min, styrene at 10.0 g / min, and n-hexane at 175.2 g / min. In a static mixer installed in the middle of the pipes supplying the mixed solution to the reactor inlet, n-butyllithium was added at 0.103 mmol / min for the inactivation treatment of the remaining impurities and mixed in, then continuously fed to the bottom of the reactor. Furthermore, 2,2-bis(2-oxolanyl)propane, as a polarizer, was added at a rate of 0.081 mmol / min, and n-butyllithium, as a polymerization initiator, was added at a rate of 0.143 mmol / min to the bottom of the first reactor, where vigorous mixing was carried out using a stirrer, while the reactor temperature was maintained at 67°C. The polymer solution was continuously drawn off from the top of the first reactor and fed to the bottom of the second reactor. The reaction was continued at 70°C, and the solution was then fed from the top of the second reactor to the static mixer. Once the polymerization was sufficiently stable, a small amount of the polymer solution was extracted before the addition of the modifier. The antioxidant (BHT) was added at a rate of 0.2 g per 100 g of polymer. The solvent was then removed, and the Mooney viscosity at 110°C and various molecular weights were measured. Further material properties are summarized in Table 3. Next, 2,2-dimethoxy-1-(3-trimethoxysilylpropyl)-1-aza-2-silacyclopentane (abbreviated as "A" in the table) was continuously added as a modifier to the polymer solution flowing from the reactor outlet at a rate of 0.0360 mmol / min. This mixture was then blended and modified using a static mixer. The time until the modifier was added to the polymer solution flowing from the reactor outlet was 4.8 minutes, the temperature was 68°C, and the temperature difference between the polymerization step and the temperature before the modifier was 2°C. An antioxidant (BHT) was continuously added to the modified polymer solution at 0.055 g / min (n-hexane solution) at a rate of 0.2 g per 100 g of polymer to terminate the modification reaction. Simultaneously with the antioxidant, oil (JOMO Process NC140, manufactured by JX Nippon Oil & Energy Co.) was continuously added.) in an amount of 37.5 g per 100 g of the polymer and mixed with a static mixer. The solvent was removed by steam stripping to obtain a modified conjugated diene-based polymer (sample 22). The material properties of sample 22 are shown in Table 3. (Modified conjugated diene-based polymer (Sample 23)) With the exception that the modifier was changed from 2,2-dimethoxy-1-(3-trimethoxysilylpropyl)-1-aza-2-silacyclopentane to tris(3-trimethoxysilylpropyl)amine (abbreviated as "B" in the table) and the addition rate was changed to 0.0250 mmol / min, a modified conjugated diene-based polymer (sample 23) was obtained in the same manner as (sample 22). The material properties of sample 23 are shown in Table 3. (Modified conjugated diene-based polymer (Sample 24)) With the exception that the modifier was changed from 2,2-dimethoxy-1-(3-trimethoxysilylpropyl)-1-aza-2-silacyclopentane to tetrakis(3-trimethoxysilylpropyl)-1,3-propanediamine (abbreviated as "C" in the table), and the addition rate was changed to 0.0190 mmol / min, a modified conjugated diene-based polymer (sample 24) was obtained in the same manner as (sample 22). The material properties of sample 24 are shown in Table 3. (Modified conjugated diene-based polymer (Sample 25)) With the exception that the amount of 2,2-bis(2-oxolanyl)propane added as a polarizing agent was changed to a rate of 0.105 mmol / min, the amount of n-butyllithium added as a polymerization initiator was changed to a rate of 0.188 mmol / min, the amount of trimethoxy(4-vinylphenyl)silane added as a branching agent was changed to 0.0350 mmol / min, and the amount of 2,2-dimethoxy-1-(3-trimethoxysilylpropyl)-1-aza-2-silacyclopentane added as a modifier was changed to 0.0510 mmol / min, a modified conjugated diene-based polymer (Sample 25) was obtained in the same manner as (Sample 22). The material properties of Sample 25 are shown in Table 3. (Modified conjugated diene-based polymer (Sample 26)) A tank-shaped pressure vessel with a stirring machine and a jacket for temperature control, wherein it is a tank-shaped reactor with a stirring machine, with an internal volume of 0.5 L, with a ratio (L / D) of internal height (L) to diameter (D) of 4.0, and with an inlet at the bottom and an outlet at the top; and as polymerization reactors, two tank-shaped pressure vessels with a stirring machine and a jacket for temperature control, wherein they are tank-shaped reactors with a stirring machine, with a capacity of 10 L, with a ratio (L / D) of internal height (L) to diameter (D) of 4.0, and with an inlet at the bottom and an outlet at the top, were connected, i.e., a total of three reactors were connected. The moisture was removed beforehand, and n-hexane was added at 175.2 g / min, 2,2-bis(2-oxolanyl)propane as a polar substance at a rate of 0.081 mmol / min, n-butyllithium as a polymerization initiator at a rate of 0.143 mmol / min, and n-butyllithium for inactivating residual impurities at 0.103 mmol / min. Trimethoxy(4-vinylphenyl)silane was also added as a branching agent (abbreviated as "BS-1" in the table) at a rate of 0.0190 mmol / min. This was vigorously mixed with a stirring machine, and the temperature in the reactor was maintained at 67°C, resulting in the formation of polymer block components. The polymer solution was continuously drawn off from the top of the first reactor and continuously fed to the bottom of the second reactor, after removing the moisture, with conditional 1,3-butadiene at 18.6 g / min and styrene at 10.0 g / min being fed from the bottom of the second reactor and mixed. The reaction was continued at 70°C, and the polymer solution was continuously drawn off from the top of the second reactor, fed to the bottom of the third reactor, and then fed from the top of the third reactor into a static mixer. This mixed solution was fed into a static mixer installed in the middle of the pipe supplying the inlet of the third reactor. If the polymerization was sufficiently stable, a small amount of the polymer solution was extracted before the addition of the modifier, and the antioxidant (BHT) was added at a rate of 0.2 g per 100 g of polymer. The solvent was then removed, and the Mooney viscosity at 110°C and various molecular weights were measured. Further material properties are also summarized in Table 3. Next, 2,2-dimethoxy-1-(3-trimethoxysilylpropyl)-1-aza-2-silacyclopentane (abbreviated as "A" in the table) was continuously added as a modifier to the polymer solution flowing from the reactor outlet at a rate of 0.0360 mmol / min. This mixture was then blended and modified using a static mixer. The time until the modifier was added to the polymerization solution flowing from the reactor outlet was 4.8 minutes, the temperature was 68°C, and the temperature difference between the polymerization temperature and the temperature before the modifier was 2°C. An antioxidant (BHT) was continuously added to the modified polymer solution at 0.055 g / min (n-hexane solution) at a rate of 0.2 g per 100 g of polymer to terminate the modification reaction. Simultaneously with the antioxidant, oil (JOMO Process NC140, manufactured by JX Nippon Oil & Energy Co.) was continuously added.) in an amount of 37.5 g per 100 g of the polymer and mixed with a static mixer. The solvent was removed by steam stripping to obtain a modified conjugated diene-based polymer (sample 26). The material properties of sample 26 are shown in Table 3. [Examples 1 to 21] and [Comparative Examples 1 to 5]. Using the conjugated diene-based polymers (samples 1 to 26) shown in Tables 1 to 3 above and natural rubbers as raw materials, conjugated diene-based polymer compositions were obtained, containing each raw rubber according to the compositions shown below. (Example 1) Conjugated diene-based polymer (Sample 1): 70 parts by mass (without oil) Natural rubber (glass transition temperature: -70°C): 30 parts by mass Silicon dioxide (trade name "Ultrasil® 7000GR", manufactured by Evonik Degussa with a specific surface area of ​​170 m² / g for nitrogen absorption): 50.0 parts by mass Carbon black (trade name "SEAST KH (N339)", manufactured by Tokai Carbon): 5.0 parts by mass Silane coupling agent (trade name "Si75", manufactured by Evonik Degussa, bis(triethoxysilylpropyl) disulfide): 6.0 parts by mass S-RAE oil (trade name "Process NC140", manufactured by JX Nippon Oil & Energy Co.): 37.5 parts by mass Zinc oxide: 2.5 parts by mass Stearic acid: 1.0 parts by mass Antioxidant (N(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine): 2.0 parts by mass; Sulfur: 2.2 parts by mass; Vulcanization accelerator 1 (N-cyclohexyl-2-benzothiazilesulfinamide): 1.7 parts by mass; Vulcanization accelerator 2 (Diphenylguanidine): 2.0 parts by mass; Total: 239.4 parts by mass (Example 22) A conjugated diene-based polymer composition was obtained in the same manner as in embodiment 1, except that the raw rubber was changed to the composition shown below. Conjugated diene-based polymer (sample 1): 50 parts by mass (without oil) Natural rubber: 50 parts by mass (Example 23) A conjugated diene-based polymer composition was obtained in the same manner as in embodiment 1, except that the raw rubber was changed to the composition shown below. Conjugated diene-based polymer (sample 1): 20 parts by mass (without oil) Natural rubber: 80 parts by mass (Example 24) A conjugated diene-based polymer composition was obtained in the same manner as in embodiment 1, except that the raw rubber was changed to the composition shown below. Conjugated diene-based polymer (sample 1): 90 parts by mass (without oil) Natural rubber: 10 parts by mass (Example 25) A conjugated diene-based polymer composition was obtained in the same manner as in embodiment 1, except that the raw rubber was changed to the composition shown below. Diene-based polymer (sample 1): 99 parts by mass (without oil) Natural rubber: 1 part by mass (Example 26) A conjugated diene-based polymer composition was obtained in the same manner as in Exemplary Example 1, except that the crude rubber was changed to the composition shown below. Conjugated diene-based polymer (Sample 1): 70 parts by mass (without oil) High cis polybutadiene rubber (trade name “BR150”, manufactured by Ube Industries, Ltd.): 30 parts by mass (Comparative example 7) A conjugated diene-based polymer composition was obtained in the same manner as in embodiment 1, except that the raw rubber was changed to the composition shown below. Conjugated diene-based polymer (sample 1): 100 parts by mass (without oil) (Comparative example 8) A conjugated diene-based polymer composition was obtained in the same manner as in embodiment 1, except that the raw rubber was changed to the composition shown below. Conjugated diene-based polymer (sample 1): 10 parts by mass (without oil) Natural rubber: 80 parts by mass (Comparative example 9) A conjugated diene-based polymer composition was obtained in the same manner as in embodiment 1, except that the crude rubber was changed to the composition shown below. Styrene-butadiene rubber (manufactured by Asahi Kasei, Tufdene® 1834, glass transition temperature: -70°C): 70 parts by mass (without oil) Natural rubber: 30 parts by mass (Comparative example 10) A conjugated diene-based polymer composition was obtained in the same manner as in embodiment 1, except that the raw rubber was changed to the composition shown below. Conjugated diene-based polymer (sample 1): 70 parts by mass (without oil) Styrene-butadiene rubber (manufactured by Arlanxeo, BUNA2353, glass transition temperature: -48°C): 30 parts by mass (without oil) The above materials were mixed according to the following procedures to obtain the rubber composition. Using a closed mixer equipped with a temperature control device (capacity 0.3 L), the raw rubber (samples 1-26, natural rubber), fillers (silicon dioxide 1, silicon dioxide 2, carbon black), silane coupling agent, process oil, zinc oxide, and stearic acid were kneaded as a first kneading stage under conditions of a 65% fill rate and a rotor speed of 30 to 50 rpm. The temperature of the closed mixer was controlled, and each rubber compound was obtained at a discharge temperature of 155-160°C. Next, in the second kneading stage, the compound obtained above was cooled to room temperature. Then, the anti-aging agent was added and the compound was kneaded again to improve the silica dispersion. The outlet temperature of the compound was again adjusted to 155–160°C by regulating the mixer temperature. After cooling, in the third kneading stage, sulfur and vulcanization accelerators 1 and 2 were added and the compound was kneaded in an open roller set to 70°C. It was then molded and vulcanized for 20 minutes in a vulcanizing press at 160°C. The properties of the rubber composition before and after vulcanization were evaluated. Specifically, the evaluations were performed using the following methods. The results are shown in Tables 4 to 7. [Evaluation of characteristics] (Rating 1) Mooney viscosity of the compound Viscosity was measured using a Mooney viscometer after preheating the rotor to 130°C for 1 minute according to JIS K6300-1 and rotating it at 2 revolutions per minute for 4 minutes, using the compound obtained above as a sample after the second kneading stage and before the third kneading stage. The results from Comparative Example 1 were indexed to 100. A lower index indicates better processability. (Rating 2) Viscoelasticity parameters Viscoelasticity parameters were measured in a torsion mode using the "ARES" viscoelasticity tester, manufactured by Rheometrics Scientific, Inc. Each measurement was indexed, with the results for the rubber composition of comparison example 1 being indexed to 100. The tan δ measured at a frequency of 10 Hz and 1% strain at 0°C was used as an indicator of wet performance. The higher the indicator, the better the wet performance. Furthermore, the tan δ measured at a frequency of 10 Hz and 3% strain at 50°C was used as an indicator of fuel-efficient performance. The lower the indicator, the better the fuel-efficient performance. Furthermore, the elastic modulus (G'), measured at -20°C at a frequency of 10 Hz and 1% strain, was used as an indicator of performance in snow. The lower the indicator, the better the performance in snow. (Rating 3) Tensile strength and elongation Tensile strength and elongation were measured in accordance with the tensile test method according to JIS K6251, and the result of comparison example 1 was indexed to 100. The higher the index, the better the tensile strength and elongation, and the more excellent the fracture strength. (Rating 4) Wear resistance The amount of wear under a load of 44.4 N and 1000 rotations was measured using an Akron abrasion tester (manufactured by Yasuda Seiki Co., Ltd.) according to JIS K6264-2, and the result from comparison example 1 was indexed to 100. The higher the index, the better the wear resistance. As shown in Tables 4 to 7, it was confirmed that embodiments 1 to 26 exhibit an excellent balance between wet performance and snow performance when used as a vulcanizate, compared to comparative examples 1 to 10. It was also confirmed that the Mooney viscosity of the compound is low when processed into a vulcanizate and that it exhibits good processability and also good wear resistance. It was subsequently confirmed that the mixture exhibits sufficient fracture strength for practical purposes when processed into a vulcanizate. [Industrial applicability] The conjugated diene-based polymer compositions of the present invention exhibit industrial applicability as materials for tire treads, automotive interior / exterior products, anti-vibration rubbers, belts, shoes, foams and various applications for industrial goods.< / modifikator> < / kupplungsmittel> < / polymerisationsinitiator> < / hauptkettenverzweigungsstruktur> < / modifizierungsgrad> < / verzweigungsgrad>

Claims

Conjugated diene-based polymer composition comprising: 20 to 99 parts by mass of rubber component (A), which is a conjugated diene-based polymer having a glass transition temperature of -35°C or more and -10°C or less; 1 to 90 parts by mass of rubber component (B) having a glass transition temperature of -50°C or less and -100°C or more; and an inorganic silicon dioxide-based filler in an amount of 0.5 to 300 parts by mass in relation to 100 parts by mass of the total amount of rubber component (A) and rubber component (B), wherein the rubber component (A) comprises a conjugated diene-based polymer (A1) comprising an aromatic vinyl compound and a conjugated diene-based compound.the conjugated diene-based polymer (A1) has an absolute molecular weight of 40 × 10⁴ or more and 5000 × 10⁴ or less, determined by a GPC light scattering method with a viscosity detector, and a degree of branching (Bn) of 8 or more, determined by a GPC light scattering method with a viscosity detector; the conjugated diene-based polymer (A1) is a conjugated diene-based polymer with a three- or more-branched star-shaped high-molecular-weight structure; at least one branched chain of the star-shaped structure has a portion derived from a vinyl-based monomer comprising an alkoxysilyl group or a halosilyl group; and the portion derived from the vinyl-based monomer comprising the alkoxysilyl group or the halosilyl group has a further branched main-chain structure; and the portion of the conjugated diene-based polymer (A1),which is derived from the vinyl-based monomer comprising the alkoxysilyl group or the halogenosilyl group, is a monomer unit based on a compound represented by formula (1) or (2) below, wherein the conjugated diene-based polymer has a branch point of a high molecular weight chain through the monomer unit based on the compound represented by formula (1) or (2) below, wherein at least one end of the conjugated diene-based polymer (A1) is coupled using a coupling agent, where in formula (1) R 1 indicates a hydrogen atom or an alkyl group with 1 to 20 carbon atoms or an aryl group with 6 to 20 carbon atoms and may have a branched structure in part of it, R 2 to R 3 They may independently indicate an alkyl group with 1 to 20 carbon atoms or an aryl group with 6 to 20 carbon atoms and may exhibit a branched structure on part of them. R 1 to R 3 are independent of each other if there are multiples of them, X 1 represents an independent halogen atom, m displays an integer from 0 to 2, n displays an integer from 0 to 3, and l displays an integer from 0 to 3, where (m + n + l) displays 3. where in formula (2) R 2 to R 5 independently of each other, they may indicate an alkyl group with 1 to 20 carbon atoms or an aryl group with 6 to 20 carbon atoms and may exhibit a branched structure on part of it, R 2 to R 5 are independent of each other if there are multiples of them, X 2 up to X 3 represent independent halogen atoms, m displays an integer from 0 to 2, n displays an integer from 0 to 3, and l displays an integer from 0 to 3, where (m + n + l) displays 3. a displays an integer from 0 to 2, b displays an integer from 0 to 3, and c displays an integer from 0 to 3, where (a + b + c) displays 3. Conjugated diene-based polymer composition according to claim 1, wherein the conjugated diene-based polymer (A1) is a modified conjugated diene-based polymer with a degree of modification of 60 wt% or more. Conjugated diene-based polymer composition according to claim 1 or 2, wherein the rubber component (B) is a natural rubber. Conjugated diene-based polymer composition according to any one of claims 1 to 4, comprising a conjugated diene-based polymer (A1) with a monomer unit based on a compound represented by formula (1), wherein in formula (1) R1 is a hydrogen atom and m = 0. Conjugated diene-based polymer composition according to any one of claims 1 to 4, comprising a conjugated diene-based polymer (A1) with a monomer unit based on a compound represented by formula (2), wherein in formula (2) m = 0 and b = 0 apply. Conjugated diene-based polymer composition according to any one of claims 1 to 4, comprising a conjugated diene-based polymer (A1) with a monomer unit based on a compound represented by formula (1), wherein in formula (1) R1 is a hydrogen atom and m = 0 and l = 0. Conjugated diene-based polymer composition according to any one of claims 1 to 5, comprising a conjugated diene-based polymer (A1) with a monomer unit based on a compound represented by formula (2), wherein in formula (2) m = 0, l = 0, a = 0, b = 0 Conjugated diene-based polymer composition according to one of claims 1 to 4, 6 or 7, comprising a conjugated diene-based polymer (A1) with a monomer unit based on a compound represented by formula (1), wherein in formula (1) R1 is a hydrogen atom and l = 0 and n = 3. Vulcanized product, in particular a tire, manufactured using the conjugated diene-based polymer composition according to any one of claims 1 to 8.