JP2013108035A - Rubber composition and pneumatic tire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rubber composition capable of improving a fuel economical efficiency, breaking strength and processability in a balanced manner, and to provide a pneumatic tire using the same.SOLUTION: The rubber composition includes silica, and a conjugated diene-based polymer obtained by reacting a nitrogen and/or silicon-containing compound with the active terminal of a copolymer obtained by polymerizing a monomer component including a conjugated diene compound and silicon-containing vinyl compound using a polymerization initiator represented by formula (I) (wherein i is 0 or 1; Ris 1-100C hydrocarbylene; Rand Rare each hydrocarbyl which may have substituents or trihydrocarbylsilyl, or hydrocarbylene which may have as a hetero atom, at least one atom selected from the atom group consisting of silicon, nitrogen and oxygen, while Rand Rbond to each other; and M is an alkali metal atom). The content of the conjugated diene-based polymer is ≤90 mass% in 100 mass% of a rubber component, and the content of silica is 5-40 pts.mass based on 100 pts.mass of the rubber component.

Description

The present invention relates to a rubber composition and a pneumatic tire produced using the rubber composition.

Conventionally, the fuel consumption of a vehicle has been reduced by reducing tire rolling resistance and suppressing heat generation. In recent years, there has been a great demand for lower fuel consumption of vehicles by using tires, and in particular, there has been a great demand for lower fuel consumption by improving treads and sidewalls. Is required. Further, not only passenger car tires but also heavy duty tires such as trucks and buses are required to have low fuel consumption.

As a method for suppressing heat generation of the rubber composition and improving fuel efficiency, a method using a low reinforcing reinforcing filler, a method of reducing the reinforcing filler content, and the like are known. However, in these methods, since the reinforcement of the rubber composition is lowered, the breaking strength tends to be lowered, and it is generally difficult to achieve both high fuel efficiency and breaking strength.

In addition, natural rubber, which is widely used for breaker rubber, etc., has a higher Mooney viscosity than synthetic rubber and has poor processability, so it is usually added with a chelating agent and masticated to reduce the Mooney viscosity. used. Therefore, when natural rubber is used, the productivity decreases due to the addition of the mastication process, and the molecular chain of the natural rubber is cleaved by mastication. There is room for improvement.

Patent Document 1 discloses a method using a deproteinized natural rubber as a method capable of achieving both low fuel consumption and breaking performance while having good processability. However, in recent years, further improvements in these performances have been demanded.

JP 2000-344955 A

An object of the present invention is to solve the above-mentioned problems and to provide a rubber composition that can improve fuel economy, breaking strength, and processability in a well-balanced manner, and a pneumatic tire using the rubber composition.

（式（Ｉ）中、ｉは０又は１であり、Ｒ^１１は炭素原子数１〜１００のヒドロカルビレン基を表し、Ｒ^１２及びＲ^１３は、置換基を有してもよいヒドロカルビル基、又は、トリヒドロカルビルシリル基を表すか、あるいは、Ｒ^１２とＲ^１３とが結合して、ケイ素原子、窒素原子及び酸素原子からなる原子群から選択される少なくとも１種の原子をヘテロ原子として有していてもよいヒドロカルビレン基を表し、Ｍはアルカリ金属原子を表す。） The present invention provides a nitrogen atom and an active terminal of a copolymer obtained by polymerizing a monomer component containing a conjugated diene compound and a silicon-containing vinyl compound using a polymerization initiator represented by the following formula (I). And / or a conjugated diene polymer obtained by reacting a compound containing a silicon atom and silica, and in 100% by mass of the rubber component, the content of the conjugated diene polymer is 90% by mass or less, It is related with the rubber composition whose content of the said silica is 5-40 mass parts with respect to 100 mass parts of said rubber components.

(In Formula (I), i is 0 or 1, R ¹¹ represents a hydrocarbylene group having 1 to 100 carbon atoms, R ¹² and R ¹³ are hydrocarbyl groups which may have a substituent, Alternatively, it represents a trihydrocarbylsilyl group, or R ¹² and R ¹³ are bonded to each other and have at least one atom selected from the atomic group consisting of a silicon atom, a nitrogen atom and an oxygen atom as a hetero atom. Represents an optionally hydrocarbylene group, and M represents an alkali metal atom.)

（式（Ｉａ）中、Ｒ^１４は共役ジエン化合物由来の構造単位及び／又は芳香族ビニル化合物由来の構造単位からなるヒドロカルビレン基を表し、ｎは１〜１０の整数を表す。） R ^{11 in the} above formula (I) is preferably a group represented by the following formula (Ia).

(In formula (Ia), R ¹⁴ represents a hydrocarbylene group composed of a structural unit derived from a conjugated diene compound and / or a structural unit derived from an aromatic vinyl compound, and n represents an integer of 1 to 10.)

R ^{14 in the} above formula (Ia) is preferably a hydrocarbylene group composed of 1 to 10 structural units derived from isoprene.

（式（ＩＩ）中、ｍは０又は１であり、Ｒ^２１はヒドロカルビレン基を表し、Ｘ^１、Ｘ^２及びＸ^３は置換アミノ基、ヒドロカルビルオキシ基、又は置換基を有していてもよいヒドロカルビル基を表す。） The silicon-containing vinyl compound is preferably a compound represented by the following formula (II).

(In the formula (II), m is 0 or 1, R ²¹ represents a hydrocarbylene group, and X ¹ , X ² and X ³ have a substituted amino group, a hydrocarbyloxy group, or a substituent. Represents a good hydrocarbyl group.)

The conjugated diene polymer preferably has a structural unit derived from an aromatic vinyl compound.

The nitrogen adsorption specific surface area of the silica is preferably 40 to 400 m ² / g.

The silica preferably contains silica (1) having a nitrogen adsorption specific surface area of 40 m ² / g or more and less than 120 m ² / g and silica (2) having a nitrogen adsorption specific surface area of 120 m ² / g or more.

The rubber composition includes an adhesive resin,
It is preferable that the silica contains a silica (1) having a nitrogen adsorption specific surface area of 40 m ² / g or more and less than 120 m ² / g and a silica (2) having a nitrogen adsorption specific surface area of 120 m ² / g or more. .

It is preferable that the nitrogen adsorption specific surface areas and contents of the silicas (1) and (2) satisfy the following formula.
(Nitrogen adsorption specific surface area of silica (2)) / (Nitrogen adsorption specific surface area of silica (1)) ≧ 1.4
(Content of silica (1)) × 0.06 ≦ (content of silica (2)) ≦ (content of silica (1)) × 15

The present invention also relates to a pneumatic tire produced using the rubber composition.

According to the present invention, since it is a rubber composition containing a specific conjugated diene polymer and silica, it is possible to provide a pneumatic tire with improved fuel economy, breaking strength, and processability in a well-balanced manner.

In the present specification, the hydrocarbyl group represents a monovalent group obtained by removing one hydrogen atom from a hydrocarbon. The hydrocarbylene group represents a divalent group obtained by removing two hydrogen atoms from a hydrocarbon. The hydrocarbyloxy group represents a monovalent group having a structure in which a hydrogen atom of a hydroxy group is replaced with a hydrocarbyl group. A substituted amino group is a group having a structure in which at least one hydrogen atom of an amino group is replaced by a monovalent atom other than a hydrogen atom or a monovalent group, or two hydrogen atoms of an amino group are divalent groups Represents a group having a structure replaced by The hydrocarbyl group having a substituent (hereinafter sometimes referred to as a substituted hydrocarbyl group) represents a monovalent group having a structure in which at least one hydrogen atom of the hydrocarbyl group is replaced with a substituent. A hydrocarbylene group having a heteroatom (hereinafter sometimes referred to as a heteroatom-containing hydrocarbylene group) is a carbon atom and / or hydrogen other than the carbon atom from which the hydrogen atom of the hydrocarbylene group is removed. A divalent group having a structure in which an atom is replaced with a group having a hetero atom (an atom other than a carbon atom or a hydrogen atom) is represented.

（式（Ｉ）中、ｉは０又は１であり、Ｒ^１１は炭素原子数１〜１００のヒドロカルビレン基を表し、Ｒ^１２及びＲ^１３は、置換基を有してもよいヒドロカルビル基、又は、トリヒドロカルビルシリル基を表すか、あるいは、Ｒ^１２とＲ^１３とが結合して、ケイ素原子、窒素原子及び酸素原子からなる原子群から選択される少なくとも１種の原子をヘテロ原子として有していてもよいヒドロカルビレン基を表し、Ｍはアルカリ金属原子を表す。） The conjugated diene polymer according to the present invention is a copolymer obtained by polymerizing a monomer component containing a conjugated diene compound and a silicon-containing vinyl compound using a polymerization initiator represented by the following formula (I). It is obtained by reacting a compound containing a nitrogen atom and / or a silicon atom with the active terminal.

(In Formula (I), i is 0 or 1, R ¹¹ represents a hydrocarbylene group having 1 to 100 carbon atoms, R ¹² and R ¹³ are hydrocarbyl groups which may have a substituent, Alternatively, it represents a trihydrocarbylsilyl group, or R ¹² and R ¹³ are bonded to each other and have at least one atom selected from the atomic group consisting of a silicon atom, a nitrogen atom and an oxygen atom as a hetero atom. Represents an optionally hydrocarbylene group, and M represents an alkali metal atom.)

In this specification, “modify” means that a compound other than these is bonded to a diene compound or a copolymer having a diene compound and an aromatic vinyl compound. In the case of the conjugated diene polymer, the polymer initiation terminal is modified by the polymerization initiator represented by the above formula (I), the main chain is modified by copolymerizing the silicon-containing vinyl compound, the nitrogen atom and / or Alternatively, it has a structure in which the terminating end is modified with a silicon-containing vinyl compound. By using the conjugated diene polymer together with other rubber components, silica can be dispersed well and fuel economy and breaking strength can be improved in a well-balanced manner. In general, when a modified rubber in which all of the start terminal, main chain, and stop terminal are modified is used, the processability tends to be greatly deteriorated. Since each of the chain and the terminal end is modified with a combination of specific compounds, good processability can be ensured, and the effect of improving fuel economy and breaking strength can be enhanced synergistically. As a result, low fuel consumption, breaking strength, and workability can be improved in a high-dimensional and well-balanced manner.

I in the formula (I) is 0 or 1, preferably 1.

R ¹¹ in the formula (I) is a hydrocarbylene group having 1 to 100 carbon atoms, preferably a hydrocarbylene group having 6 to 100 carbon atoms, more preferably 7 to 80 carbon atoms. It is a hydrocarbylene group. When the number of carbon atoms in R ¹¹ exceeds 100, the molecular weight of the polymerization initiator increases, and the economy and operability during polymerization may be reduced.
As the polymerization initiator represented by formula (I), the number of carbon atoms of R ¹¹ may be used in combination plural kinds of different compounds.

（式（Ｉａ）中、Ｒ^１４は共役ジエン化合物由来の構造単位及び／又は芳香族ビニル化合物由来の構造単位からなるヒドロカルビレン基を表し、ｎは１〜１０の整数を表す。） R ¹¹ in the formula (I) is preferably a group represented by the following formula (Ia).

(In formula (Ia), R ¹⁴ represents a hydrocarbylene group composed of a structural unit derived from a conjugated diene compound and / or a structural unit derived from an aromatic vinyl compound, and n represents an integer of 1 to 10.)

In the formula (Ia), R ¹⁴ represents a hydrocarbylene group composed of a structural unit derived from a conjugated diene compound and / or a structural unit derived from an aromatic vinyl compound, preferably a hydrocarbylene group composed of a structural unit derived from isoprene. And more preferably a hydrocarbylene group consisting of 1 to 10 structural units derived from isoprene.

The number of structural units derived from a conjugated diene compound and / or an aromatic vinyl compound in R ¹⁴ is preferably 1 to 10 units, and more preferably 1 to 5 units.

In the formula (Ia), n is an integer of 1 to 10, preferably an integer of 2 to 4.

R ¹¹ includes a group in which 1 to 10 structural units derived from isoprene and a methylene group are bonded, a group in which 1 to 10 structural units derived from isoprene and an ethylene group are bonded, and a structural unit 1 to 1 derived from isoprene. Examples thereof include a group in which 10 units and a trimethylene group are bonded, and a group in which 1 to 10 structural units derived from isoprene and a trimethylene group are bonded is preferable.

R ¹² and R ^{13 in} formula (I) represent a hydrocarbyl group or a trihydrocarbylsilyl group which may have a substituent, or R ¹² and R ¹³ are bonded to each other to form a silicon atom, The hydrocarbylene group which may have as a hetero atom the atom selected from the group which consists of a nitrogen atom and an oxygen atom is represented.

The hydrocarbyl group which may have a substituent is a hydrocarbyl group or a substituted hydrocarbyl group. Examples of the substituent in the substituted hydrocarbyl group include a substituted amino group and a hydrocarbyloxy group. Hydrocarbyl groups include methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, n-pentyl, n-hexyl, and n-octyl. Group, a chain alkyl group such as n-dodecyl group; a cyclic alkyl group such as cyclopentyl group and cyclohexyl group; and an aryl group such as phenyl group and benzyl group, preferably a chain alkyl group, more preferably Is a chain alkyl group having 1 to 4 carbon atoms. Examples of the substituted hydrocarbyl group in which the substituent is a substituted amino group include an N, N-dimethylaminomethyl group, a 2-N, N-dimethylaminoethyl group, and a 3-N, N-dimethylaminopropyl group. Examples of the substituted hydrocarbyl group in which the substituent is a hydrocarbyloxy group include a methoxymethyl group, a methoxyethyl group, and an ethoxymethyl group. In these, a hydrocarbyl group is preferable, a C1-C4 chain alkyl group is more preferable, and a methyl group or an ethyl group is still more preferable.

Examples of the trihydrocarbylsilyl group include a trimethylsilyl group and a tert-butyl-dimethylsilyl group, and a trimethylsilyl group is preferable.

The hydrocarbylene group which may have at least one atom selected from the atomic group consisting of a silicon atom, a nitrogen atom and an oxygen atom as a heteroatom is a hydrocarbylene group, or a heteroatom is a silicon atom, nitrogen It is a heteroatom-containing hydrocarbylene group which is at least one atom selected from an atomic group consisting of an atom and an oxygen atom. As the heteroatom-containing hydrocarbylene group in which the heteroatom is at least one atom selected from the group consisting of a silicon atom, a nitrogen atom, and an oxygen atom, the heteroatom-containing hydrocarbylene group in which the heteroatom is a silicon atom, Examples thereof include a heteroatom-containing hydrocarbylene group in which the heteroatom is a nitrogen atom and a heteroatom-containing hydrocarbylene group in which the heteroatom is an oxygen atom. Examples of the hydrocarbylene group include a tetramethylene group, a pentamethylene group, a hexamethylene group, a pentan-2-ene-1,5-diyl group, and a 2,2,4-trimethylhexane-1,6-diyl group. Alkylene group; Alkenediyl group such as pentane-2-ene-1,5-diyl group can be mentioned, preferably an alkylene group, more preferably an alkylene group having 4 to 7 carbon atoms. Examples of the heteroatom-containing hydrocarbylene group in which the heteroatom is a silicon atom include a group represented by —Si (CH ₃ ) ₂ —CH ₂ —CH ₂ —Si (CH ₃ ) ₂ —. Examples of the heteroatom-containing hydrocarbylene group in which the heteroatom is a nitrogen atom include a group represented by —CH═N—CH═CH— and a group represented by —CH═N—CH ₂ —CH ₂ —. be able to. Examples of the heteroatom-containing hydrocarbylene group in which the heteroatom is an oxygen atom include a group represented by —CH ₂ —CH ₂ —O—CH ₂ —CH ₂ —. In these, a hydrocarbylene group is preferable, a C4-C7 alkylene group is more preferable, and a tetramethylene group, a pentamethylene group, and a hexamethylene group are further more preferable.

R ¹² and R ¹³ are preferably hydrocarbyl groups, or R ¹² and R ¹³ are preferably bonded to form a hydrocarbylene group, which is a chain alkyl group having 1 to 4 carbon atoms, or a bond It is more preferably an alkylene group having 4 to 7 carbon atoms, and further preferably a methyl group or an ethyl group.

In formula (I), M represents an alkali metal atom. Examples of the alkali metal atom include Li, Na, K, and Cs, and Li is preferable.

Among the polymerization initiators represented by the formula (I), examples of the compound in which i is 1 include compounds obtained by polymerizing 1 to 5 structural units derived from isoprene on an aminoalkyl lithium compound. Examples of the aminoalkyllithium compound include 3- (N, N-dimethylamino) -1-propyllithium, 3- (N, N-diethylamino) -1-propyllithium, 3- (N, N-di-n- Butylamino) -1-propyllithium, 4- (N, N-dimethylamino) -1-butyllithium, 4- (N, N-diethylamino) -1-butyllithium, 4- (N, N-di-n) N, N-dialkylaminoalkyllithium such as -propylamino) -1-butyllithium, 3- (N, N-di-n-butylamino) -1-butyllithium; 3- (1-pyrrolidino) -1- Propyllithium, 3- (1-piperidino) -1-propyllithium, 3- (1-hexamethyleneimino) -1-propyllithium, 3- [1- (1,2,3,6-tetrahydro) Non-heteroatom-containing cyclic aminoalkyllithium compounds such as lysino)]-1-propyllithium; 3- (1-morpholino) -1-propyllithium, 3- (1-imidazolyl) -1-propyllithium, 3- (4 , 5-dihydro-1-imidazolyl) -1-propyllithium, 3- (2,2,5,5-tetramethyl-1-aza-2,5-disila-1-cyclopentyl) -1-propyllithium, etc. Heteroatom-containing cyclic aminoalkyllithium compounds can be mentioned, N, N-dialkylaminoalkyllithium is preferred, 3- (N, N-dimethylamino) -1-propyllithium or 3- (N, N-diethylamino) -1-Propyllithium is more preferred.

Among the polymerization initiators represented by the formula (I), compounds in which i is 0 include lithium hexamethylene imide, lithium pyrrolidide, lithium piperidide, lithium heptamethylene imide, lithium dodecamethylene imide, and lithium dimethylamide. , Lithium diethylamide, lithium dipropylamide, lithium dibutylamide, lithium dihexylamide, lithium diheptylamide, lithium dioctylamide, lithium di-2-ethylhexylamide, lithium didecylamide, lithium-N-methylpiperazide, lithium ethylpropylamide, lithium Examples thereof include ethyl butyramide, lithium methyl butyramide, lithium ethyl benzylamide, and lithium methyl phenethyl amide.

Among the polymerization initiators represented by the formula (I), a compound in which i is 0 may be preliminarily prepared from a secondary amine and a hydrocarbyl lithium compound and used for the polymerization reaction, or generated in a polymerization system. Also good. Here, as the secondary amine, in addition to dimethylamine, diethylamine, dibutylamine, dioctylamine, dicyclohexylamine, diisobutylamine, etc., azacycloheptane (that is, hexamethyleneimine), 2- (2-ethylhexyl) pyrrolidine, 3 -(2-propyl) pyrrolidine, 3,5-bis (2-ethylhexyl) piperidine, 4-phenylpiperidine, 7-decyl-1-azacyclotridecane, 3,3-dimethyl-1-azacyclotetradecane, 4- Dodecyl-1-azacyclooctane, 4- (2-phenylbutyl) -1-azacyclooctane, 3-ethyl-5-cyclohexyl-1-azacycloheptane, 4-hexyl-1-azacycloheptane, 9-isoamyl -1-Azacycloheptadecane, 2-methyl-1-a Cycloheptadec-9-ene, 3-isobutyl-1-azacyclododecane, 2-methyl-7-tert-butyl-1-azacyclododecane, 5-nonyl-1-azacyclododecane, 8- (4-methylphenyl) -5-pentyl-3-azabicyclo [5.4.0] undecane, 1-butyl-6-azabicyclo [3.2.1] octane, 8-ethyl-3-azabicyclo [3.2.1] octane, -Propyl-3-azabicyclo [3.2.2] nonane, 3- (t-butyl) -7-azabicyclo [4.3.0] nonane, 1,5,5-trimethyl-3-azabicyclo [4.4 .0] cyclic amines such as decane.

As the polymerization initiator represented by the formula (I), a compound in which i is 1 is preferable, and a compound obtained by polymerizing 1 to 5 structural units derived from isoprene on N, N-aminoalkyllithium is more preferable. More preferred is a compound obtained by polymerizing 1 to 5 structural units derived from isoprene on-(N, N-dimethylamino) -1-propyllithium or 3- (N, N-diethylamino) -1-propyllithium.

The amount of the polymerization initiator represented by the formula (I) is preferably 0.01 to 15 mmol, more preferably 0.1 to 10 mmol, per 100 g of monomer components used in the polymerization.

In the present invention, if necessary, another polymerization initiator such as n-butyl lithium may be used in combination.

Examples of the conjugated diene compound include 1,3-butadiene, isoprene, 1,3-pentadiene, 2,3-dimethyl-1,3-butadiene, 1,3-hexadiene, and myrcene. Two or more kinds may be used. From the viewpoint of availability, 1,3-butadiene and isoprene are preferable.

（式（ＩＩ）中、ｍは０又は１であり、Ｒ^２１はヒドロカルビレン基を表し、Ｘ^１、Ｘ^２及びＸ^３は置換アミノ基、ヒドロカルビルオキシ基、又は置換基を有していてもよいヒドロカルビル基を表す。） The silicon-containing vinyl compound is preferably a compound represented by the following formula (II).

(In the formula (II), m is 0 or 1, R ²¹ represents a hydrocarbylene group, and X ¹ , X ² and X ³ have a substituted amino group, a hydrocarbyloxy group, or a substituent. Represents a good hydrocarbyl group.)

M in the formula (II) is 0 or 1, preferably 0.

Examples of the hydrocarbylene group in the formula (II) include an alkylene group, an alkenediyl group, an arylene group, and a group in which an arylene group and an alkylene group are bonded. Examples of the alkylene group include a methylene group, an ethylene group, and a trimethylene group. Examples of the alkenediyl group include a vinylene group and an ethylene-1,1-diyl group. Examples of the arylene group include a phenylene group, a naphthylene group, and a biphenylene group. Examples of the group in which an arylene group and an alkylene group are bonded include a group in which a phenylene group and a methylene group are bonded, and a group in which a phenylene group and an ethylene group are bonded.

R ²¹ is preferably an arylene group, more preferably a phenylene group.

In the formula (II), X ¹ , X ² and X ³ represent a substituted amino group, a hydrocarbyloxy group, or a hydrocarbyl group which may have a substituent. Preferably, at least one of X ¹ , X ² and X ³ is a substituted amino group, more preferably ^{two of} X ¹ , X ² and X ³ are substituted amino groups.

（式（ＩＩａ）中、Ｒ^２２及びＲ^２３は、置換基を有してもよいヒドロカルビル基、又は、トリヒドロカルビルシリル基を表すか、あるいは、Ｒ^２２とＲ^２３とが結合して、窒素原子及び／又は酸素原子をヘテロ原子として有していてもよいヒドロカルビレン基を表す。） The substituted amino group in the formula (II) is preferably a group represented by the following formula (IIa).

(In formula (IIa), R ²² and R ²³ represent a hydrocarbyl group or trihydrocarbylsilyl group which may have a substituent, or R ²² and R ²³ are bonded to form a nitrogen atom. And / or a hydrocarbylene group which may have an oxygen atom as a hetero atom.)

The hydrocarbyl group which may have a substituent in formula (IIa) is a hydrocarbyl group or a substituted hydrocarbyl group. Examples of the substituted hydrocarbyl group include a substituted hydrocarbyl group in which the substituent is a hydrocarbyloxy group. Hydrocarbyl groups include methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, n-pentyl, n-hexyl, and n-octyl. A chain alkyl group such as a group; a cyclic alkyl group such as a cyclopentyl group and a cyclohexyl group; and an aryl group such as a phenyl group, a benzyl group, and a naphthyl group. A chain alkyl group is preferred, and a methyl group or an ethyl group is preferred. More preferred. Examples of the substituted hydrocarbyl group in which the substituent is a hydrocarbyloxy group include alkoxyalkyl groups such as a methoxymethyl group, ethoxymethyl group, and methoxyethyl group; aryloxyalkyl groups such as a phenoxymethyl group.

Examples of the trihydrocarbylsilyl group in the formula (IIa) include trialkylsilyl groups such as a trimethylsilyl group, a triethylsilyl group, and a tert-butyldimethylsilyl group.

The hydrocarbylene group which may have a nitrogen atom and / or an oxygen atom in formula (IIa) as a heteroatom is a heteroatom-containing hydrocarbyl group in which the hydrocarbylene group or heteroatom is a nitrogen atom and / or an oxygen atom. Is a ren group. The heteroatom-containing hydrocarbylene group in which the heteroatom is a nitrogen atom and / or an oxygen atom includes a heteroatom-containing hydrocarbylene group in which the heteroatom is a nitrogen atom, and a heteroatom-containing hydrocarbylene in which the heteroatom is an oxygen atom You can raise a group. Examples of the hydrocarbylene group include trimethylene group, tetramethylene group, pentamethylene group, hexamethylene group, heptamethylene group, octamethylene group, decamethylene group, dodecamethylene group, 2,2,4-trimethylhexane-1,6. An alkylene group such as a diyl group; and an alkenediyl group such as a pentane-2-ene-1,5-diyl group. Examples of the heteroatom-containing hydrocarbylene group in which the heteroatom is a nitrogen atom include a group represented by —CH═N—CH═CH— and a group represented by —CH═N—CH ₂ —CH ₂ —. be able to. Examples of the heteroatom-containing hydrocarbylene group in which the heteroatom is an oxygen atom include a group represented by —CH ₂ —CH ₂ —O—CH ₂ —CH ₂ —.

R ²² and R ²³ are alkyl groups, or R ²² and R ²³ are preferably bonded to form an alkylene group, more preferably an alkyl group, and a methyl group or an ethyl group. Is more preferable.

Among the substituted amino groups represented by the formula (IIa), R ²² and R ²³ are hydrocarbyl groups, and dimethylamino group, diethylamino group, ethylmethylamino group, di-n-propylamino group, diisopropylamino group A dialkylamino group such as di-n-butylamino group, diisobutylamino group, di-sec-butylamino group, di-tert-butylamino group; Group is preferable, and a dimethylamino group, a diethylamino group, and a di-n-butylamino group are more preferable. Examples of the substituted hydrocarbyl group in which R ²² and R ²³ have a hydrocarbyloxy group as a substituent include di (alkoxyalkyl) amino groups such as di (methoxymethyl) amino group and di (ethoxymethyl) amino group. Can do. Examples of R ²² and R ^{23 that} are trihydrocarbylsilyl groups include trialkylsilyl groups such as bis (trimethylsilyl) amino group, bis (tert-butyldimethylsilyl) amino group, and N-trimethylsilyl-N-methylamino group. An amino group can be mentioned.

Among the substituted amino groups represented by the formula (IIa), those in which R ²² and R ²³ are bonded to form a hydrocarbylene group include 1-trimethyleneimino group, 1-pyrrolidino group, 1- Examples include 1-alkyleneimino groups such as piperidino group, 1-hexamethyleneimino group, 1-heptamethyleneimino group, 1-octamethyleneimino group, 1-decamethyleneimino group, 1-dodecamethyleneimino group. Examples of the hetero atom-containing hydrocarbylene group in which the hetero atom is a nitrogen atom include a 1-imidazolyl group and a 4,5-dihydro-1-imidazolyl group. Examples of the hetero atom-containing hydrocarbylene group in which the hetero atom is an oxygen atom include a morpholino group.

The substituted amino group represented by the formula (IIa) is preferably a dialkylamino group or a 1-alkyleneimino group, more preferably a dialkylamino group, and further preferably a dimethylamino group, a diethylamino group, or a di-n-butylamino group. .

Examples of the hydrocarbyloxy group in the formula (II) include alkoxy groups such as methoxy group, ethoxy group, n-propoxy group, isopropoxy group, n-butoxy group, sec-butoxy group, and tert-butoxy group; phenoxy group, benzyloxy And aryloxy groups such as a group.

The hydrocarbyl group which may have a substituent in formula (II) is a hydrocarbyl group or a substituted hydrocarbyl group. Examples of the substituted hydrocarbyl group include a substituted hydrocarbyl group in which the substituent is a hydrocarbyloxy group. Examples of the hydrocarbyl group include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, a sec-butyl group, and a tert-butyl group; a phenyl group, a 4-methyl-1-phenyl group, An aryl group such as a benzyl group can be mentioned. Examples of the substituted hydrocarbyl group in which the substituent is a hydrocarbyloxy group include alkoxyalkyl groups such as a methoxymethyl group, an ethoxymethyl group, and an ethoxyethyl group.

Of the silicon-containing vinyl compounds represented by the formula (II), one of X ¹ , X ² and X ³ is a substituted amino group, and m is 0.
(Dimethylamino) dimethylvinylsilane, (ethylmethylamino) dimethylvinylsilane, (di-n-propylamino) dimethylvinylsilane, (diisopropylamino) dimethylvinylsilane, (dimethylamino) diethylvinylsilane, (ethylmethylamino) diethylvinylsilane, (di (N-propylamino) diethylvinylsilane, (dialkylamino) dialkylvinylsilanes such as (diisopropylamino) diethylvinylsilane; [bis (trimethylsilyl) amino] dimethylvinylsilane, [bis (t-butyldimethylsilyl) amino] dimethylvinylsilane, [bis [Bis (trialkyl) amino] diethylvinylsilane, [bis (t-butyldimethylsilyl) amino] diethylvinylsilane, etc. (Silyl) amino] dialkylvinylsilane; (dimethylamino) di (methoxymethyl) vinylsilane, (dimethylamino) di (methoxyethyl) vinylsilane, (dimethylamino) di (ethoxymethyl) vinylsilane, (dimethylamino) di (ethoxyethyl) vinylsilane (Dialkylamino) di (alkoxyalkyl) such as (diethylamino) di (methoxymethyl) vinylsilane, (diethylamino) di (methoxyethyl) vinylsilane, (diethylamino) di (ethoxymethyl) vinylsilane, (diethylamino) di (ethoxyethyl) vinylsilane ) Vinylsilane; pyrrolidinodimethylvinylsilane, piperidinodimethylvinylsilane, hexamethyleneiminodimethylvinylsilane, 4,5-dihydroimidazolyldimethylvinyl Silane, can be mentioned morpholino cyclic amino dialkylvinylsilane compounds such as dimethyl vinyl silane.

Of the silicon-containing vinyl compounds represented by the formula (II), one of X ¹ , X ² and X ³ is a substituted amino group and m is 1,
(Dimethylamino) dimethyl-4-vinylphenylsilane, (dimethylamino) dimethyl-3-vinylphenylsilane, (diethylamino) dimethyl-4-vinylphenylsilane, (diethylamino) dimethyl-3-vinylphenylsilane, (di-n -Propylamino) dimethyl-4-vinylphenylsilane, (di-n-propylamino) dimethyl-3-vinylphenylsilane, (di-n-butylamino) dimethyl-4-vinylphenylsilane, (di-n-butyl) Amino) dimethyl-3-vinylphenylsilane, (dimethylamino) diethyl-4-vinylphenylsilane, (dimethylamino) diethyl-3-vinylphenylsilane, (diethylamino) diethyl-4-vinylphenylsilane, (diethylamino) diethyl- 3-vinyl pheny Silane, (di-n-propylamino) diethyl-4-vinylphenylsilane, (di-n-propylamino) diethyl-3-vinylphenylsilane, (di-n-butylamino) diethyl-4-vinylphenylsilane, Mention may be made of (dialkylamino) dialkylvinylphenylsilanes such as (di-n-butylamino) diethyl-3-vinylphenylsilane.

Of the silicon-containing vinyl compounds represented by the formula (II), ^{two of} X ¹ , X ² and X ³ are substituted amino groups, and m is 0.
Bis (dimethylamino) methylvinylsilane, bis (diethylamino) methylvinylsilane, bis (di-n-propylamino) methylvinylsilane, bis (di-n-butylamino) methylvinylsilane, bis (dimethylamino) ethylvinylsilane, bis (diethylamino) ) Bis (dialkylamino) alkylvinylsilanes such as ethylvinylsilane, bis (di-n-propylamino) ethylvinylsilane, bis (di-n-butylamino) ethylvinylsilane; bis [bis (trimethylsilyl) amino] methylvinylsilane, bis [ Bis (tert-butyldimethylsilyl) amino] methylvinylsilane, bis [bis (trimethylsilyl) amino] ethylvinylsilane, bis [bis (tert-butyldimethylsilyl) amino] ethylvinyl Bis [bis (trialkylsilyl) amino] alkyl vinyl silanes such as orchid; bis (dimethylamino) methoxymethyl vinyl silane, bis (dimethylamino) methoxyethyl vinyl silane, bis (dimethylamino) ethoxymethyl vinyl silane, bis (dimethylamino) ethoxyethyl Bis (dialkylamino) alkoxyalkylsilanes such as vinylsilane, bis (diethylamino) methoxymethylvinylsilane, bis (diethylamino) methoxyethylvinylsilane, bis (diethylamino) ethoxymethylvinylsilane, bis (dimethylamino) ethoxyethylvinylsilane; bis (pyrrolidino) methyl Vinylsilane, bis (piperidino) methylvinylsilane, bis (hexamethyleneimino) methylvinylsilane, bis (4,5- It can be mentioned hydro imidazolylmethyl) methyl vinyl silane, bis (morpholino) bis (cyclic amino such as methyl vinyl silane) alkyl vinyl silane compounds.

Among the silicon-containing vinyl compounds represented by the formula (II), ^{two of} X ¹ , X ² and X ³ are substituted amino groups, and m is 1,
Bis (dimethylamino) methyl-4-vinylphenylsilane, bis (dimethylamino) methyl-3-vinylphenylsilane, bis (diethylamino) methyl-4-vinylphenylsilane, bis (diethylamino) methyl-3-vinylphenylsilane, Bis (di-n-propylamino) methyl-4-vinylphenylsilane, bis (di-n-propylamino) methyl-3-vinylphenylsilane, bis (di-n-butylamino) methyl-4-vinylphenylsilane Bis (di-n-butylamino) methyl-3-vinylphenylsilane, bis (dimethylamino) ethyl-4-vinylphenylsilane, bis (dimethylamino) ethyl-3-vinylphenylsilane, bis (diethylamino) ethyl- 4-vinylphenylsilane, bis (diethylamino) Til-3-vinylphenylsilane, bis (di-n-propylamino) ethyl-4-vinylphenylsilane, bis (di-n-propylamino) ethyl-3-vinylphenylsilane, bis (di-n-butylamino) And bis (dialkylamino) alkylvinylphenylsilane such as ethyl-4-vinylphenylsilane and bis (di-n-butylamino) ethyl-3-vinylphenylsilane.

Of the silicon-containing vinyl compounds represented by the formula (II), three of X ¹ , X ² and X ³ are substituted amino groups, and m is 0.
Examples thereof include tris (dialkylamino) vinylsilane such as tris (dimethylamino) vinylsilane, tris (diethylamino) vinylsilane, tris (di-n-propylamino) vinylsilane, and tris (di-n-butylamino) vinylsilane.

Of the silicon-containing vinyl compounds represented by the formula (II), three of X ¹ , X ² and X ³ are substituted amino groups, and m is 1,
Tris (dimethylamino) -4-vinylphenylsilane, tris (dimethylamino) -3-vinylphenylsilane, tris (diethylamino) -4-vinylphenylsilane, tris (diethylamino) -3-vinylphenylsilane, tris (di- n-propylamino) -4-vinylphenylsilane, tris (di-n-propylamino) -3-vinylphenylsilane, tris (di-n-butylamino) -4-vinylphenylsilane, tris (di-n- And tris (dialkylamino) vinylphenylsilane such as butylamino) -3-vinylphenylsilane.

Among the silicon-containing vinyl compounds represented by the formula (II), as compounds in which X ¹ , X ² and X ³ are not substituted amino groups and m is 0,
Trialkoxyvinylsilanes such as trimethoxyvinylsilane, triethoxyvinylsilane, tripropoxyvinylsilane; dialkoxyalkylvinylsilanes such as methyldimethoxyvinylsilane and methyldiethoxyvinylsilane; di (tert-pentoxy) phenylvinylsilane, di (tert-butoxy) phenylvinylsilane Dialkoxyarylvinylsilanes; monoalkoxydialkylvinylsilanes such as dimethylmethoxyvinylsilane; monoalkoxydiarylvinylsilanes such as tert-butoxydiphenylvinylsilane, tert-pentoxydiphenylvinylsilane; tert-butoxymethylphenylvinylsilane, tert-butoxyethylphenylvinylsilane, etc. Monoalkoxyalkylary Vinylsilane; tris (beta-methoxyethoxy) substitution such as vinyl silane alkoxy vinyl silane compounds can be mentioned.

Further, examples of the silicon-containing vinyl compound include 4-N, N-bis (trimethylsilyl) aminostyrene, bis (trialkylsilyl) aminostyrene such as 3-N, N-bis (trimethylsilyl) aminostyrene; 4-bis (trimethylsilyl). ) Bis (trialkylsilyl) aminoalkylstyrene such as aminomethylstyrene, 3-bis (trimethylsilyl) aminomethylstyrene, 4-bis (trimethylsilyl) aminoethylstyrene, 3-bis (trimethylsilyl) aminoethylstyrene .

The silicon-containing vinyl compound is preferably a compound represented by formula (II), more preferably a compound in which m in formula (II) is 0, and among X ¹ , X ² and X ³ in formula (II) More preferred are compounds in which two are dialkylamino groups.

Particularly preferred compounds as the silicon-containing vinyl compound are bis (dimethylamino) methylvinylsilane, bis (diethylamino) methylvinylsilane, and bis (di-n-butylamino) methylvinylsilane.

In the production of the conjugated diene polymer, the amount of the silicon-containing vinyl compound used is 100% by mass based on the total amount of monomer components used in the polymerization, and the fuel economy, breaking strength and processability are improved in a well-balanced manner. Therefore, Preferably it is 0.01 mass% or more, More preferably, it is 0.02 mass% or more, More preferably, it is 0.05 mass% or more. In order to increase economic efficiency and increase the breaking strength, the content is preferably 20% by mass or less, more preferably 2% by mass or less, and further preferably 1% by mass or less.

In the production of the conjugated diene polymer, a polymerizable monomer may be used as the monomer component in addition to the conjugated diene compound and the silicon-containing vinyl compound. Examples of the monomer include aromatic vinyl compounds, vinyl nitriles and unsaturated carboxylic acid esters. Examples of the aromatic vinyl compound include styrene, α-methylstyrene, vinyl toluene, vinyl naphthalene, divinyl benzene, trivinyl benzene, and divinyl naphthalene. Examples of the vinyl nitrile include acrylonitrile, and examples of the unsaturated carboxylic acid ester include methyl acrylate, ethyl acrylate, methyl methacrylate, and ethyl methacrylate. In these, an aromatic vinyl compound is preferable and styrene is more preferable.

When an aromatic vinyl compound is used in the production of the conjugated diene polymer, the amount of the aromatic vinyl compound used is preferably 10% by mass, with the total amount of the conjugated diene compound and the aromatic vinyl compound being 100% by mass. It is at least mass% (the amount of conjugated diene compound used is 90 mass% or less), more preferably at least 15 mass% (the amount of conjugated diene compound used is 85 mass% or less). From the viewpoint of low fuel consumption, the amount of aromatic vinyl compound used is preferably 50% by mass or less (the amount of conjugated diene compound used is 50% by mass or more), more preferably 45% by mass or less (conjugated diene). The amount of the compound used is 55% by mass or more).

In the production of the conjugated diene polymer, the polymerization is preferably performed in a hydrocarbon solvent. The hydrocarbon solvent is a solvent that does not deactivate the polymerization initiator of formula (I), and examples thereof include aliphatic hydrocarbons, aromatic hydrocarbons, and alicyclic hydrocarbons. Examples of the aliphatic hydrocarbon include propane, n-butane, iso-butane, n-pentane, iso-pentane, n-hexane, n-heptane, and n-octane. Examples of the aromatic hydrocarbon include benzene, toluene, xylene, and ethylbenzene. Examples of the alicyclic hydrocarbon include cyclopentane and cyclohexane. The hydrocarbon solvent may be a mixture of various components such as industrial hexane. Preferably, it is a hydrocarbon having 2 to 12 carbon atoms.

Polymerization reaction is an agent that adjusts the amount of vinyl bonds of conjugated diene units, an agent that adjusts the distribution of monomer units based on monomers other than conjugated diene units and conjugated dienes in the conjugated diene polymer chain , And collectively referred to as “regulators”). Examples of such agents include ether compounds, tertiary amine compounds, and phosphine compounds. Examples of the ether compound include cyclic ethers such as tetrahydrofuran, tetrahydropyran, and 1,4-dioxane; aliphatic monoethers such as diethyl ether and dibutyl ether; ethylene glycol dimethyl ether, ethylene glycol diethyl ether, ethylene glycol dibutyl ether, and diethylene glycol diethyl ether. And aliphatic diethers such as diethylene glycol dibutyl ether; aromatic ethers such as diphenyl ether and anisole. Examples of the tertiary amine compound include triethylamine, tripropylamine, tributylamine, N, N, N ′, N′-tetramethylethylenediamine, N, N-diethylaniline, pyridine, quinoline and the like. Examples of the phosphine compound include trimethylphosphine, triethylphosphine, triphenylphosphine, and the like. One or more of these are used.

In the production of the conjugated diene polymer, a polymerization initiator may be supplied to the polymerization reactor before supplying the monomer component to the polymerization reactor. The polymerization initiator may be supplied to the polymerization reactor after being supplied to the reactor, or a part of the monomer components used for the polymerization may be supplied to the polymerization reactor and then supplied to the polymerization reactor. Good. Moreover, a polymerization initiator may be supplied to a polymerization reactor at a time, and may be supplied continuously.

In the production of the conjugated diene polymer, the monomer component may be supplied to the polymerization reactor at a time, may be supplied continuously, or may be supplied intermittently. Moreover, each monomer may be supplied separately to the polymerization reactor or may be supplied simultaneously.

The polymerization temperature in the production of the conjugated diene polymer is usually 25 to 100 ° C, preferably 35 to 90 ° C. More preferably, it is 50-80 degreeC. The polymerization time is usually 10 minutes to 5 hours.

The conjugated diene polymer is prepared by polymerizing a monomer component containing a conjugated diene compound and a silicon-containing vinyl compound using a polymerization initiator represented by the formula (I) (active terminal (copolymer)). It can be obtained by reacting a compound containing a nitrogen atom and / or a silicon atom with the active terminal of the polymer (which is considered to have an alkali metal derived from the polymerization initiator) (terminal modification reaction). Specifically, a compound containing a nitrogen atom and / or a silicon atom is added to the polymerization solution and mixed. The amount of the compound containing nitrogen atoms and / or silicon atoms added to the polymerization solution is usually 0.1 to 3 mol per 1 mol of the alkali metal derived from the polymerization initiator represented by the formula (I) used. , Preferably, it is 0.5-2 mol, More preferably, it is 0.7-1.5 mol.

The reaction temperature of the terminal modification reaction is usually 25 to 100 ° C, preferably 35 to 90 ° C, more preferably 50 to 80 ° C. The reaction time for the terminal reaction is usually 60 seconds to 5 hours, preferably 5 minutes to 1 hour, more preferably 15 minutes to 1 hour.

Among the compounds containing a nitrogen atom and / or a silicon atom, preferred are compounds containing a nitrogen atom and a carbonyl group.

（式（ＩＩＩ）中、Ｒ^３１は置換基を有してもよいヒドロカルビル基、Ｒ^３２と結合して窒素原子及び／又は酸素原子をヘテロ原子として有していてもよいヒドロカルビレン基、あるいは、Ｒ^３４と結合して２価基を表し、Ｒ^３２は置換基を有してもよいヒドロカルビル基、あるいは、Ｒ^３１と結合して窒素原子及び／又は酸素原子をヘテロ原子として有していてもよいヒドロカルビレン基を表し、Ｒ^３４は置換基を有してもよいヒドロカルビル基、水素原子、あるいは、Ｒ^３１と結合して２価基を表す。また、Ｒ^３３は２価基を表し、ｋは０又は１を表す。） As the compound containing a nitrogen atom and a carbonyl group, a compound represented by the following formula (III) is preferable.

(In the formula (III), R ³¹ is a hydrocarbyl group which may have a substituent, a hydrocarbylene group which may be bonded to R ³² and have a nitrogen atom and / or an oxygen atom as a hetero atom, or represents divalent group bonded to R ^34, R ³² are have an optionally substituted hydrocarbyl group, or a nitrogen atom and / or oxygen atom bonded to R ³¹ as a hetero atom R ³⁴ may be a hydrocarbyl group which may have a substituent, a hydrogen atom, or a divalent group bonded to R ^31. R ³³ represents a divalent group. , K represents 0 or 1.)

In the formula (III), the hydrocarbyl group which may have a substituent of R ³¹ , R ³² and R ³⁴ is a hydrocarbyl group or a substituted hydrocarbyl group. Examples of the substituted hydrocarbyl group include a substituted hydrocarbyl group in which the substituent is a hydrocarbyloxy group, and a substituted hydrocarbyl group in which the substituent is a substituted amino group. Examples of the hydrocarbyl group include alkyl groups such as methyl group, ethyl group, n-propyl group, isopropyl group and n-butyl group; alkenyl groups such as vinyl group, allyl group and isopropenyl group; and aryl groups such as phenyl group. be able to. Examples of the substituted hydrocarbyl group in which the substituent is a hydrocarbyloxy group include alkoxyalkyl groups such as a methoxymethyl group, an ethoxymethyl group, and an ethoxyethyl group. Examples of the substituted hydrocarbyl group in which the substituent is a substituted amino group include 2- (N, N-dimethylamino) ethyl group, 2- (N, N-diethylamino) ethyl group, and 3- (N, N-dimethylamino) propyl. Group, (N, N-dialkylamino) alkyl group such as 3- (N, N-diethylamino) propyl group; 4- (N, N-dimethylamino) phenyl group, 3- (N, N-dimethylamino) phenyl Groups, (N, N-dialkylamino) aryl groups such as 4- (N, N-diethylamino) phenyl group, 3- (N, N-diethylamino) phenyl group; 4- (N, N-dimethylamino) methylphenyl Groups, (N, N-dialkylamino) alkylaryl groups such as 4- (N, N-dimethylamino) ethylphenyl group; 3-pyrrolidinopropyl group, 3-piperidinop group Cyclic amino group-containing alkyl groups such as pill group and 3-imidazolylpropyl group; Cyclic amino group-containing aryl groups such as 4-pyrrolidinophenyl group, 4-piperidinophenyl group, 4-imidazolylphenyl group; 4-pyrrolidino Examples thereof include cyclic amino group-containing alkylaryl groups such as ethylphenyl group, 4-piperidinoethylphenyl group, and 4-imidazolylethylphenyl group.

In the formula (III), the hydrocarbylene group optionally having a nitrogen atom and / or an oxygen atom to which R ³¹ and R ³² are bonded as a hetero atom is a hydrocarbylene group, or a hetero atom is a nitrogen atom and And / or a heteroatom-containing hydrocarbylene group which is an oxygen atom. The heteroatom-containing hydrocarbylene group in which the heteroatom is a nitrogen atom and / or an oxygen atom includes a heteroatom-containing hydrocarbylene group in which the heteroatom is a nitrogen atom, and a heteroatom-containing hydrocarbylene in which the heteroatom is an oxygen atom You can raise a group. As hydrocarbylene groups, trimethylene group, tetramethylene group, pentamethylene group, hexamethylene group, pentan-2-ene-1,5-diyl group, 2,2,4-trimethylhexane-1,6-diyl An alkylene group such as a group; and an arylene group such as a 1,4-phenylene group. Examples of the heteroatom-containing hydrocarbylene group in which the heteroatom is a nitrogen atom include a group represented by —CH═N—CH═CH— and a group represented by —CH═N—CH ₂ —CH ₂ —. be able to. Examples of the heteroatom-containing hydrocarbylene group in which the heteroatom is an oxygen atom include groups represented by — (CH ₂ ) _s —O— (CH ₂ ) _t — (s and t are integers of 1 or more). Can do.

In the formula (III), the divalent group in which R ³¹ and R ³⁴ are bonded and the divalent group of R ³³ include a hydrocarbylene group, a heteroatom-containing hydrocarbylene group in which the hetero atom is a nitrogen atom, hetero A heteroatom-containing hydrocarbylene group in which the atom is an oxygen atom, a group in which a hydrocarbylene group and an oxygen atom are bonded, a hydrocarbylene group and a group represented by —NR ³⁵ — (R ³⁵ is a hydrocarbyl group or a hydrogen atom And a group bonded to each other. As hydrocarbylene groups, trimethylene group, tetramethylene group, pentamethylene group, hexamethylene group, pentan-2-ene-1,5-diyl group, 2,2,4-trimethylhexane-1,6-diyl An alkylene group such as a group; and an arylene group such as a 1,4-phenylene group. Examples of the heteroatom-containing hydrocarbylene group in which the heteroatom is a nitrogen atom include a group represented by —CH═N—CH═CH— and a group represented by —CH═N—CH ₂ —CH ₂ —. be able to. Examples of the heteroatom-containing hydrocarbylene group in which the heteroatom is an oxygen atom include groups represented by — (CH ₂ ) _s —O— (CH ₂ ) _t — (s and t are integers of 1 or more). Can do. Examples of the group in which the hydrocarbylene group and the oxygen atom are bonded to each other include a group represented by — (CH ₂ ) _r —O— (r represents an integer of 1 or more). As a group in which a hydrocarbylene group and a group represented by —NR ³⁵ — (R ³⁵ represents a hydrocarbyl group or a hydrogen atom) are bonded, a group represented by — (CH ₂ ) _p —NR ³⁵ — ( R ³⁵ represents a hydrocarbyl group (preferably a hydrocarbyl group having 1 to 6 carbon atoms) or a hydrogen atom, and p represents an integer of 1 or more.

（式（ＩＩＩａ）中、Ｒ^３１は置換基を有してもよいヒドロカルビル基を表すか、Ｒ^３２と結合して窒素原子及び／又は酸素原子をヘテロ原子として有していてもよいヒドロカルビレン基を表し、Ｒ^３２は置換基を有してもよいヒドロカルビル基を表すか、Ｒ^３１と結合して窒素原子及び／又は酸素原子をヘテロ原子として有していてもよいヒドロカルビレン基を表し、Ｒ^３４は置換基を有してもよいヒドロカルビル基又は水素原子を表す。） Preferred examples of the compound represented by the formula (III) include a compound represented by the following formula (IIIa) in which k is 0 and R ³⁴ is a hydrocarbyl group or a hydrogen atom which may have a substituent. it can.

(In formula (IIIa), R ³¹ represents a hydrocarbyl group which may have a substituent, or a hydrocarbylene which may be bonded to R ³² and have a nitrogen atom and / or an oxygen atom as a hetero atom. R ³² represents a hydrocarbyl group which may have a substituent or a hydrocarbylene group which may combine with R ³¹ and have a nitrogen atom and / or an oxygen atom as a hetero atom. , R ³⁴ represents a hydrocarbyl group or a hydrogen atom which may have a substituent.

In the formula (IIIa), a hydrocarbyl group which may have a substituent of R ³¹ , R ³² and R ³⁴ , a nitrogen atom and / or an oxygen atom to which R ³¹ and R ³² are bonded have a hetero atom. The description and examples of the preferred hydrocarbylene group are the same as those described in the description of formula (III).

In the formula (IIIa), R ³¹ is preferably a hydrocarbyl group having 1 to 10 carbon atoms, or a hydrocarbylene group having 3 to 10 carbon atoms bonded to R ³² or a hetero atom is a nitrogen atom. It is a heteroatom-containing hydrocarbylene group having 3 to 10 carbon atoms. More preferably, it is an alkyl group having 1 to 10 carbon atoms or an aryl group having 6 to 10 carbon atoms, or an alkylene group having 3 to 10 carbon atoms bonded to R ³² , —CH═N—CH═ It is a group represented by CH— or a group represented by —CH═N—CH ₂ —CH ₂ —. More preferably, it is a C1-C6 alkyl group. Particularly preferred is a methyl group or an ethyl group.

In the formula (IIIa), R ³² is preferably a hydrocarbyl group having 1 to 10 carbon atoms, or a hydrocarbylene group having 3 to 10 carbon atoms or a hetero atom bonded to R ³¹ is a nitrogen atom. It is a heteroatom-containing hydrocarbylene group having 3 to 10 carbon atoms. More preferably, it is an alkyl group having 1 to 10 carbon atoms or an aryl group having 6 to 10 carbon atoms, or an alkylene group having 3 to 10 carbon atoms bonded to R ³¹ , —CH═N—CH═ It is a group represented by CH— or a group represented by —CH═N—CH ₂ —CH ₂ —. More preferably, it is a C1-C6 alkyl group. Particularly preferred is a methyl group or an ethyl group.

In the formula (IIIa), R ³⁴ is preferably a hydrocarbyl group or a hydrogen atom, more preferably a hydrocarbyl group or a hydrogen atom having 1 to 10 carbon atoms, still more preferably an alkyl group having 1 to 6 carbon atoms or A hydrogen atom, particularly preferably a hydrogen atom, a methyl group, or an ethyl group.

Among the compounds represented by the formula (IIIa), those in which R ³⁴ is a hydrocarbyl group include N, N-dimethylacetamide, N, N-diethylacetamide, N-methyl-N-ethylacetamide and the like. -Dihydrocarbylacetamide; N, N-dihydrocarbylacrylamide such as N-dimethylacrylamide, N, N-diethylacrylamide, N-methyl-N-ethylacrylamide; N, N-dimethylmethacrylamide, N, N-diethylmethacrylamide N, N-dihydrocarbylmethacrylamide such as N-methyl-N-ethylmethacrylamide.

Among the compounds represented by the formula (IIIa), those in which R ³⁴ is a hydrogen atom include N, N-dimethylformamide, N, N-dimethylformamide, N-methyl-N-ethylformamide and the like. -Dihydrocarbylformamide can be mentioned.

（式（ＩＩＩｂ）中、Ｒ^３２は置換基を有してもよいヒドロカルビル基を表し、Ｒ^３６はヒドロカルビレン基又はヒドロカルビレン基と−ＮＲ^３５−で表される基とが結合した基を表し、Ｒ^３５はヒドロカルビル基又は水素原子を表す。） Preferred examples of the compound represented by the formula (III) include a compound represented by the following formula (IIIb) in which k is 0 and R ³⁴ is bonded to R ³¹ to form a divalent group.

(In the formula (IIIb), R ³² represents a hydrocarbyl group which may have a substituent, and R ³⁶ is a group in which a hydrocarbylene group or a hydrocarbylene group is bonded to a group represented by —NR ³⁵ —. And R ³⁵ represents a hydrocarbyl group or a hydrogen atom.)

In the formula (IIIb), the description and illustration of the hydrocarbyl group which may have a substituent of R ³² are the same as those described in the description of the formula (III).

In the formula (IIIb), the hydrocarbylene group of R ³⁶ includes trimethylene group, tetramethylene group, pentamethylene group, hexamethylene group, pentan-2-ene-1,5-diyl group, 2,2,4- Examples thereof include alkylene groups such as trimethylhexane-1,6-diyl group; and arylene groups such as 1,4-phenylene group. The group of R ³⁶ to which a hydrocarbylene group and a group represented by —NR ³⁵ — (R ³⁵ represents a hydrocarbyl group or a hydrogen atom) is bonded to — (CH ₂ ) _p —NR ³⁵ —. And a group represented by the formula (R ³⁵ represents a hydrocarbyl group or a hydrogen atom, and p represents an integer of 1 or more).

In the formula (IIIb), R ³² is preferably a hydrocarbyl group having 1 to 10 carbon atoms, more preferably an alkyl group having 1 to 10 carbon atoms or an aryl group having 6 to 10 carbon atoms, and further preferably Is an alkyl group having 1 to 6 carbon atoms or a phenyl group, particularly preferably a methyl group, an ethyl group or a phenyl group.

In the formula (IIIb), R ³⁶ is preferably a hydrocarbylene group having 1 to 10 carbon atoms, or a group represented by —NR ³⁵ — and a hydrocarbylene group having 1 to 10 carbon atoms (R ³⁵ is A hydrocarbyl group (preferably a hydrocarbyl group having 1 to 10 carbon atoms) or a hydrogen atom), and more preferably an alkylene group having 3 to 6 carbon atoms or — (CH ₂ ) _p —. A group represented by NR ³⁵ — (R ³⁵ represents a hydrocarbyl group (preferably a hydrocarbyl group having 1 to 10 carbon atoms), and p represents an integer of 1 or more (preferably an integer of 2 to 5)). And more preferably a trimethylene group, a tetramethylene group, a pentamethylene group, or a group represented by — (CH ₂ ) ₂ —N (CH ₃ ) —.

Among the compounds represented by formula (IIIb), those in which R ³⁶ is a hydrocarbylene group include N-hydrocarbyl- such as N-methyl-β-propiolactam, N-phenyl-β-propiolactam, and the like. β-propiolactam; N-methyl-2-pyrrolidone, N-vinyl-2-pyrrolidone, N-phenyl-2-pyrrolidone, N-tert-butyl-2-pyrrolidone, N-methyl-5-methyl-2- N-hydrocarbyl-2-pyrrolidone such as pyrrolidone; N-hydrocarbyl-2-piperidone such as N-methyl-2-piperidone, N-vinyl-2-piperidone, N-phenyl-2-piperidone; N-methyl-ε- N-hydrocarbyl-ε-caprolactam such as caprolactam, N-phenyl-ε-caprolactam; N-methyl-ω-laurylacta , N- vinyl -ω- can be mentioned N- hydrocarbyl -ω- Lau Lilo lactams such Lau Lilo lactams, among them N- phenyl-2-pyrrolidone, N- methyl -ε- caprolactam are preferred.

Of the compounds represented by formula (IIIb), R ³⁶ is a group in which a hydrocarbylene group and a group represented by —NR ³⁵ — are bonded (R ³⁵ represents a hydrocarbyl group or a hydrogen atom). 1,3-dimethyl-2-imidazolidinone, 1,3-diethyl-2-imidazolidinone, 1,3-divinyl-2-imidazolidinone, 1-methyl-3-ethyl-2-imidazolidinone Examples include 1,3-dihydrocarbyl-2-imidazolidinone such as non-one, among which 1,3-dimethyl-2-imidazolidinone is preferable.

（式（ＩＩＩｃ）中、Ｒ^３１は置換基を有してもよいヒドロカルビル基を表すか、あるいはＲ^３２と結合して窒素原子及び／又は酸素原子をヘテロ原子として有していてもよいヒドロカルビレン基を表し、Ｒ^３２は置換基を有してもよいヒドロカルビル基を表すか、あるいはＲ^３１と結合して窒素原子及び／又は酸素原子をヘテロ原子として有していてもよいヒドロカルビレン基を表し、Ｒ^３３はヒドロカルビレン基を表し、Ｒ^３４は置換基を有してもよいヒドロカルビル基又は水素原子を表す。） Preferable compounds represented by the formula (III) include compounds represented by the following formula (IIIc) in which k is 1 and R ³³ is a hydrocarbylene group.

(In the formula (IIIc), R ³¹ represents a hydrocarbyl group which may have a substituent, or a hydrocarbyl which may be bonded to R ³² and have a nitrogen atom and / or an oxygen atom as a hetero atom. R ³² represents a hydrocarbyl group which may have a substituent, or R ³² may be bonded to R ³¹ and may have a nitrogen atom and / or an oxygen atom as a hetero atom R ³³ represents a hydrocarbylene group, and R ³⁴ represents a hydrocarbyl group or a hydrogen atom which may have a substituent.

In the formula (IIIc), a hydrocarbyl group which may have a substituent of R ³¹ , R ³² and R ³⁴ , and a nitrogen atom and / or an oxygen atom to which R ³¹ and R ³² are bonded have a hetero atom. The description and illustration of the preferred hydrocarbylene group, the hydrocarbylene group of R ³³ are the same as those described in the description of formula (III).

In the formula (IIIc), R ³³ is preferably a hydrocarbylene group having 1 to 10 carbon atoms, more preferably an alkylene group having 1 to 10 carbon atoms or an arylene group having 6 to 10 carbon atoms, More preferred are an alkylene group having 1 to 6 carbon atoms or a phenylene group, and particularly preferred are an ethylene group, a trimethylene group and a 1,4-phenylene group.

In the formula (IIIc), R ³⁴ is preferably a hydrocarbyl group having 1 to 10 carbon atoms, or a substituted hydrocarbyl group having 1 to 10 carbon atoms in which the substituent is a dialkylamino group, more preferably 1 carbon atom. An alkyl group having 6 to 6 carbon atoms or an aryl group having 6 to 10 carbon atoms, or a dialkylaminoalkyl group having 1 to 6 carbon atoms or a dialkylaminoaryl group having 6 to 10 carbon atoms, more preferably a methyl group or an ethyl group. Group, phenyl group, 3-dimethylaminoethyl group, 4-diethylaminophenyl group.

In the formula (IIIc), R ³¹ is preferably a hydrocarbyl group having 1 to 10 carbon atoms, or a hydrocarbylene group having 3 to 10 carbon atoms bonded to R ³² , or a hetero atom is a nitrogen atom or an oxygen atom It is a heteroatom-containing hydrocarbylene group having 3 to 10 carbon atoms, more preferably an alkyl group having 1 to 10 carbon atoms or an aryl group having 6 to 10 carbon atoms, or a bond to R ³² An alkylene group having 3 to 10 carbon atoms, a group represented by —CH═N—CH═CH—, a group represented by —CH═N—CH ₂ —CH ₂ —, — (CH ₂ ) ₂ A group represented by —O— (CH ₂ ) ₂ —, more preferably an alkyl group having 1 to 6 carbon atoms, or an alkylene group having 3 to 6 carbon atoms bonded to R ³² , — CH = N—CH═CH— A group represented by —CH═N—CH ₂ —CH ₂ —, particularly preferably a methyl group, an ethyl group, or a bond with R ³² to form a tetramethylene group, a hexamethylene group, —CH. = N-CH = CH-.

In the formula (IIIc), R ³² is preferably a hydrocarbyl group having 1 to 10 carbon atoms, or a hydrocarbylene group having 3 to 10 carbon atoms bonded to R ³¹ , or a hetero atom is a nitrogen atom or an oxygen atom. It is a heteroatom-containing hydrocarbylene group having 3 to 10 carbon atoms, more preferably an alkyl group having 1 to 10 carbon atoms or an aryl group having 6 to 10 carbon atoms, or a bond with R ³¹ An alkylene group having 3 to 10 carbon atoms, a group represented by —CH═N—CH═CH—, a group represented by —CH═N—CH ₂ —CH ₂ —, — (CH ₂ ) ₂ A group represented by —O— (CH ₂ ) ₂ —, more preferably an alkyl group having 1 to 6 carbon atoms, or an alkylene group having 3 to 6 carbon atoms bonded to R ³¹ ; CH = N—CH═CH— A group represented by —CH═N—CH ₂ —CH ₂ —, particularly preferably a methyl group, an ethyl group, or a bond with R ³¹ to form a tetramethylene group, a hexamethylene group, —CH. = N-CH = CH-.

Among the compounds represented by the formula (IIIc), as the compound in which R ³⁴ is a hydrocarbyl group,
4-N, N-dihydrocarbylaminoacetophenone such as 4- (N, N-dimethylamino) acetophenone, 4-N-methyl-N-ethylaminoacetophenone, 4-N, N-diethylaminoacetophenone; 4 ′-(imidazole Examples include 4-cyclic aminoacetophenone compounds such as -1-yl) acetophenone and 4-pyrazolylacetophenone, among which 4-cyclic aminoacetophenone compounds are preferable, and 4 ′-(imidazol-1-yl) acetophenone is more preferable. .

Among the compounds represented by the formula (IIIc), as the compound in which R ³⁴ is a substituted hydrocarbyl group,
Bis (dihydrocarbylaminoalkyl) ketones such as 1,7-bis (methylethylamino) -4-heptanone, 1,3-bis (diphenylamino) -2-propanone; 4-N, N-dimethylaminobenzophenone, 4 4- (dihydrocarbylamino) benzophenone such as -N, N-di-t-butylaminobenzophenone, 4-N, N-diphenylaminobenzophenone; 4,4'-bis (dimethylamino) benzophenone, 4,4'- 4,4'-bis (dihydrocarbylamino) benzophenone such as bis (diethylamino) benzophenone and 4,4'-bis (diphenylamino) benzophenone can be mentioned, among which 4,4'-bis (dihydrocarbylamino) benzophenone 4,4′-bis (diethylamino) benzofe Emissions is more preferable.

（式（ＩＩＩｄ）中、Ｒ^３１は置換基を有してもよいヒドロカルビル基を表すか、あるいはＲ^３２と結合して窒素原子及び／又は酸素原子をヘテロ原子として有していてもよいヒドロカルビレン基を表し、Ｒ^３２は置換基を有してもよいヒドロカルビル基を表すか、あるいはＲ^３１と結合して窒素原子及び／又は酸素原子をヘテロ原子として有していてもよいヒドロカルビレン基を表し、Ｒ^３７はヒドロカルビレン基を表し、Ａは酸素原子又は−ＮＲ^３５−を表し、Ｒ^３５はヒドロカルビル基又は水素原子を表し、Ｒ^３４は置換基を有してもよいヒドロカルビル基又は水素原子を表す。） As a preferable compound represented by the formula (III), k is 1, and R ³³ is a group in which a hydrocarbylene group and an oxygen atom are bonded, or a group represented by a hydrocarbylene group and —NR ³⁵ — ( R ³⁵ may be a compound represented by the following formula (IIId), which is a group bonded to a hydrocarbyl group or a hydrogen atom.

(In the formula (IIId), R ³¹ represents a hydrocarbyl group which may have a substituent, or a hydrocarbyl which may be bonded to R ³² and have a nitrogen atom and / or an oxygen atom as a hetero atom. R ³² represents a hydrocarbyl group which may have a substituent, or R ³² may be bonded to R ³¹ and may have a nitrogen atom and / or an oxygen atom as a hetero atom R ³⁷ represents a hydrocarbylene group, A represents an oxygen atom or —NR ³⁵ —, R ³⁵ represents a hydrocarbyl group or a hydrogen atom, and R ³⁴ represents an optionally substituted hydrocarbyl group or Represents a hydrogen atom.)

In the formula (IIId), a hydrocarbyl group which may have a substituent of R ³¹ , R ³² and R ³⁴ , a nitrogen atom and / or an oxygen atom to which R ³¹ and R ³² are bonded have a hetero atom. The description and examples of the preferred hydrocarbylene group are the same as those described in the description of formula (III). The hydrocarbyl group of R ³⁵ is the same as that described for the hydrocarbyl group of R ³¹ , R ³² and R ³⁴ .

In formula (IIId), A is preferably an oxygen atom or a group represented by —NR ³⁵ — (R ³⁵ is a hydrocarbyl group (preferably a hydrocarbyl group having 1 to 5 carbon atoms) or a hydrogen atom). , More preferably an oxygen atom or a group represented by —NH—, and still more preferably a group represented by —NH—.

In formula (IIId), the hydrocarbylene group of R ³⁷ is trimethylene group, tetramethylene group, pentamethylene group, hexamethylene group, pentan-2-ene-1,5-diyl group, 2,2,4- Examples thereof include alkylene groups such as trimethylhexane-1,6-diyl group; and arylene groups such as 1,4-phenylene group.

In the formula (IIId), R ³⁴ is preferably a hydrocarbyl group having 1 to 10 carbon atoms, more preferably an alkenyl group having 2 to 5 carbon atoms, and further preferably a vinyl group.

In the formula (IIId), R ³⁷ is preferably a hydrocarbylene group having 1 to 10 carbon atoms, more preferably an alkylene group having 1 to 6 carbon atoms, still more preferably an ethylene group or a trimethylene group. Particularly preferred is a trimethylene group.

In the formula (IIId), R ³¹ is preferably a hydrocarbyl group having 1 to 10 carbon atoms, or a hydrocarbylene group having 3 to 10 carbon atoms bonded to R ³² , or a hetero atom is a nitrogen atom or oxygen It is a heteroatom-containing hydrocarbylene group having 3 to 10 carbon atoms, more preferably an alkyl group having 1 to 10 carbon atoms or an aryl group having 6 to 10 carbon atoms, or a bond to R ³² An alkylene group having 3 to 10 carbon atoms, a group represented by —CH═N—CH═CH—, a group represented by —CH═N—CH ₂ —CH ₂ —, — (CH ₂ ) ₂ A group represented by —O— (CH ₂ ) ₂ —, more preferably an alkyl group having 1 to 6 carbon atoms, or an alkylene group having 3 to 6 carbon atoms bonded to R ³² , — CH = N—CH═CH— A group represented by —CH═N—CH ₂ —CH ₂ —, particularly preferably a methyl group, an ethyl group, or a bond with R ³² to form a tetramethylene group, a hexamethylene group, —CH. = N-CH = CH-.

In the formula (IIId), R ³² is preferably a hydrocarbyl group having 1 to 10 carbon atoms, or a hydrocarbylene group having 3 to 10 carbon atoms bonded to R ³¹ , or a hetero atom is a nitrogen atom or an oxygen atom. It is a heteroatom-containing hydrocarbylene group having 3 to 10 carbon atoms, more preferably an alkyl group having 1 to 10 carbon atoms or an aryl group having 6 to 10 carbon atoms, or a bond with R ³¹ An alkylene group having 3 to 10 carbon atoms, a group represented by —CH═N—CH═CH—, a group represented by —CH═N—CH ₂ —CH ₂ —, — (CH ₂ ) ₂ A group represented by —O— (CH ₂ ) ₂ —, more preferably an alkyl group having 1 to 6 carbon atoms, or an alkylene group having 3 to 6 carbon atoms bonded to R ³¹ ; CH = N—CH═CH— A group represented by —CH═N—CH ₂ —CH ₂ —, particularly preferably a methyl group, an ethyl group, or a bond with R ³¹ to form a tetramethylene group, a hexamethylene group, —CH. = N-CH = CH-.

Among the compounds represented by the formula (IIId), as the compound in which A is an oxygen atom,
2-N, N-dimethylaminoethyl acrylate, 2-N, N-dihydrocarbylaminoethyl acrylate such as 2-N, N-diethylaminoethyl acrylate; 3-N, such as 3-N, N-dimethylaminopropyl acrylate N-dihydrocarbylaminopropyl acrylate; 2-N, N-dihydrocarbylaminoethyl methacrylate such as 2-N, N-dimethylaminoethyl methacrylate and 2-N, N-diethylaminoethyl methacrylate; 3-N, N-dimethylamino 3-N, N-dihydrocarbylaminopropyl methacrylate such as propyl methacrylate can be mentioned, 3-N, N-dihydrocarbylaminopropyl acrylate is preferred, and 3-N, N-dimethylaminopropyl acrylate is more preferred There.

Among the compounds represented by the formula (IIId), as the compound wherein A is a group represented by —NR ³⁵ — (R ³⁵ represents a hydrocarbyl group or a hydrogen atom),
N, N-dihydrocarbylaminoethylacrylamide such as N, N-dimethylaminoethylacrylamide, N, N-diethylaminoethylacrylamide; N, N- such as N, N-dimethylaminopropylacrylamide, N, N-diethylaminopropylacrylamide Dihydrocarbylaminopropylacrylamide; N, N-dihydrocarbylaminobutylacrylamide such as N, N-dimethylaminobutylacrylamide, N, N-diethylaminobutylacrylamide; N, N-dimethylaminoethylmethacrylamide, N, N-diethylaminoethyl N, N-dihydrocarbylaminoethyl methacrylamide such as methacrylamide; N, N-dimethylaminopropyl methacrylamide, N, N-diethylaminopropyl N, N-dihydrocarbylaminopropyl methacrylamide such as tacrylamide; N, N-dihydrocarbylaminobutyl methacrylamide such as N, N-dimethylaminobutyl methacrylamide and N, N-diethylaminobutyl methacrylamide; N, N-dihydrocarbylaminopropylacrylamide is preferred, and N, N-dimethylaminopropylacrylamide is more preferred.

A preferred compound represented by the formula (III) is a compound represented by the formula (IIId), among which N, N-dihydrocarbylaminopropylacrylamide is particularly preferred, and N, N-dimethylaminopropylacrylamide is most preferred. .

In addition to the above, a compound containing an alkoxysilyl group can also be mentioned as a preferable compound containing a nitrogen atom and / or a silicon atom.

（式（ＩＶ）中、Ｒ^４１はヒドロカルビル基を表し、Ｒ^４２、Ｒ^４３はヒドロカルビル基又はヒドロカルビルオキシ基を表し、Ｒ^４４は置換基を有してもよいヒドロカルビル基又はトリヒドロカルビルシリル基を表すか、あるいはＲ^４５と結合して、ケイ素原子、窒素原子及び酸素原子からなる原子群より選択される少なくとも一種の原子をヘテロ原子として有してもよいヒドロカルビレン基を表し、Ｒ^４５は置換基を有してもよいヒドロカルビル基又はトリヒドロカルビルシリル基を表すか、あるいはＲ^４４と結合して、ケイ素原子、窒素原子及び酸素原子からなる原子群より選択される少なくとも一種の原子をヘテロ原子として有してもよいヒドロカルビレン基を表し、ｊは１〜５の整数を表す。） As the compound containing an alkoxysilyl group, a compound containing a nitrogen atom and an alkoxysilyl group is preferable, and a compound represented by the following formula (IV) is more preferable.

(In the formula (IV), R ⁴¹ represents a hydrocarbyl group, R ⁴² and R ⁴³ represent a hydrocarbyl group or a hydrocarbyloxy group, and R ⁴⁴ represents a hydrocarbyl group or a trihydrocarbylsilyl group which may have a substituent. carded or combined with R ^45,, represents a silicon atom, a nitrogen atom and hydrocarbylene group optionally having at least one atom as a hetero atom selected from the group of atoms consisting of oxygen atoms, R ⁴⁵ is substituted represent a hydrocarbyl group or a trihydrocarbylsilyl group which may have a group, or combined with R ^44, at least one atom selected from the group of atoms of silicon atoms, nitrogen atoms and oxygen atoms as a hetero atom (It represents a hydrocarbylene group that may be present, and j represents an integer of 1 to 5.)

In the above formula (IV), the hydrocarbyl group which may have a substituent is a hydrocarbyl group or a substituted hydrocarbyl group. Examples of hydrocarbyl groups include alkyl groups such as methyl, ethyl, n-propyl, isopropyl, and n-butyl groups; alkenyl groups such as vinyl, allyl, and isopropenyl groups; and aryl groups such as phenyl groups. It is preferably an alkyl group, more preferably a methyl group or an ethyl group. Examples of the substituted hydrocarbyl group include oxacycloalkyl groups such as an oxiranyl group and a tetrahydrofuranyl group, and a tetrahydrofuranyl group is preferable.

In this specification, the oxacycloalkyl group represents a group in which CH ₂ on the alicyclic ring of the cycloalkyl group is replaced with an oxygen atom.

Hydrocarbyloxy groups include alkoxy groups such as methoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, sec-butoxy and tert-butoxy; aryloxy such as phenoxy and benzyloxy Group, and preferably an alkoxy group, more preferably a methoxy group or an ethoxy group.

Examples of the trihydrocarbylsilyl group include a trimethylsilyl group and a tert-butyl-dimethylsilyl group, and a trimethylsilyl group is preferable.

The hydrocarbylene group which may have at least one atom selected from the atomic group consisting of a silicon atom, a nitrogen atom and an oxygen atom as a heteroatom is a hydrocarbylene group, or the heteroatom is a silicon atom or a nitrogen atom And a heteroatom-containing hydrocarbylene group that is at least one atom selected from the group consisting of oxygen atoms. As the heteroatom-containing hydrocarbylene group in which the heteroatom is at least one atom selected from the group consisting of a silicon atom, a nitrogen atom and an oxygen atom, the heteroatom-containing hydrocarbylene group in which the heteroatom is a silicon atom, Examples thereof include a heteroatom-containing hydrocarbylene group in which the heteroatom is a nitrogen atom and a heteroatom-containing hydrocarbylene group in which the heteroatom is an oxygen atom. Examples of the hydrocarbylene group include a tetramethylene group, a pentamethylene group, a hexamethylene group, a pentan-2-ene-1,5-diyl group, and a 2,2,4-trimethylhexane-1,6-diyl group. An alkylene group can be mentioned, Among these, an alkylene group having 4 to 7 carbon atoms is preferable, and a pentamethylene group or a hexamethylene group is particularly preferable. Examples of the heteroatom-containing hydrocarbylene group in which the heteroatom is a silicon atom include a group represented by —Si (CH ₃ ) ₂ —CH ₂ —CH ₂ —Si (CH ₃ ) ₂ —. The heteroatom-containing hydrocarbylene group in which the heteroatom is a nitrogen atom includes a group represented by —CH═N—CH═CH— or a group represented by —CH═N—CH ₂ —CH ₂ —. I can give you. Examples include a heteroatom-containing hydrocarbylene group in which the heteroatom is an oxygen atom, and a group represented by —CH ₂ —CH ₂ —O—CH ₂ —CH ₂ —.

In the above formula (IV), R ⁴¹ is preferably an alkyl group having 1 to 4 carbon atoms, more preferably a methyl group or an ethyl group. R ⁴² and R ⁴³ are preferably a hydrocarbyloxy group, more preferably an alkoxy group having 1 to 4 carbon atoms, and still more preferably a methoxy group or an ethoxy group. R ⁴⁴ and R ⁴⁵ are preferably hydrocarbyl groups, more preferably alkyl groups having 1 to 4 carbon atoms, and still more preferably methyl groups or ethyl groups. J is preferably an integer of 2 to 4.

Examples of the compound represented by the formula (IV) include 3-dimethylaminopropyltriethoxysilane, 3-dimethylaminopropyltrimethoxysilane, 3-diethylaminopropyltriethoxysilane, 3-diethylaminopropyltrimethoxysilane, and 3-dimethyl. [(Dialkylamino) alkyl] alkoxysilane compounds such as aminopropylmethyldiethoxysilane, 2-dimethylaminoethyltriethoxysilane, 2-dimethylaminoethyltrimethoxysilane; hexamethyleneiminomethyltrimethoxysilane, 3-hexamethyleneimino Cyclic amino such as propyltriethoxysilane, N- (3-triethoxysilylpropyl) -4,5-dihydroimidazole, N- (3-trimethoxysilylpropyl) -4,5-imidazole [Di (tetrahydrofuranyl) amino] alkylalkoxysilane compounds such as 3- [di (tetrahydrofuranyl) amino] propyltrimethoxysilane and 3- [di (tetrahydrofuranyl) amino] propyltriethoxysilane; N N, N-bis (trialkylsilyl) aminoalkylalkoxysilane compounds such as N, N-bis (trimethylsilyl) aminopropylmethyldimethoxysilane, N, N-bis (trimethylsilyl) aminopropylmethyldiethoxysilane, Of these, [(dialkylamino) alkyl] alkoxysilane compounds are preferred, and 3-dimethylaminopropyltriethoxysilane, 3-dimethylaminopropyltrimethoxysilane, 3-diethylaminopropylto Silane, 3-diethylaminopropyl trimethoxysilane is more preferred.

As a compound containing an alkoxysilyl group, in addition to the compound containing a nitrogen atom and an alkoxysilyl group,
Tetraalkoxysilanes such as tetramethoxysilane, tetraethoxysilane, tetra-n-propoxysilane; trialkoxyhydrocarbylsilanes such as methyltrimethoxysilane, methyltriethoxysilane, ethyltrimethoxysilane, phenyltrimethoxysilane; trimethoxychlorosilane, Trialkoxyhalosilanes such as triethoxychlorosilane and tri-n-propoxychlorosilane; dialkoxydihydrocarbylsilanes such as dimethoxydimethylsilane, diethoxydimethylsilane and dimethoxydiethylsilane; dimethoxydichlorosilane, diethoxydichlorosilane and di-n- Dialkoxydihalosilanes such as propoxydichlorosilane; monoalkoxytrihydrocarbylsilanes such as methoxytrimethylsilane Monoalkoxytrihalosilanes such as methoxytrichlorosilane and ethoxytrichlorosilane; 2-glycidoxyethyltrimethoxysilane, 2-glycidoxyethyltriethoxysilane, (2-glycidoxyethyl) methyldimethoxysilane, 3-glycid (Glycidoxyalkyl) alkoxysilane compounds such as xylpropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, (3-glycidoxypropyl) methyldimethoxysilane; 2- (3,4-epoxycyclohexyl) ethyl (3,4-epoxycyclohexyl) alkyl alcohols such as trimethoxysilane, 2- (3,4-epoxycyclohexyl) ethyltriethoxysilane, 2- (3,4-epoxycyclohexyl) ethyl (methyl) dimethoxysilane Sisilane compounds; alkoxysilylalkyl succinic anhydrides such as 3-trimethoxysilylpropyl succinic anhydride, 3-triethoxysilylpropyl succinic anhydride; 3-methacryloyloxypropyl trimethoxysilane, 3-methacryloyloxypropyl And (methacryloyloxyalkyl) alkoxysilane compounds such as triethoxysilane.

Moreover, the compound containing an alkoxysilyl group may contain a nitrogen atom and a carbonyl group. Examples of the compound containing an alkoxysilyl group and containing a nitrogen atom and a carbonyl group include tris [3- (trimethoxysilyl) propyl] isocyanurate, tris [3- (triethoxysilyl) propyl] isocyanurate, tris [3 Examples include tris [(alkoxysilyl) alkyl] isocyanurate compounds such as-(tripropoxysilyl) propyl] isocyanurate and tris [3- (tributoxysilyl) propyl] isocyanurate, among which tris [3- (tri Methoxysilyl) propyl] isocyanurate is preferred.

In the method for producing the conjugated diene polymer, a coupling agent may be added to the hydrocarbon solution of the conjugated diene polymer from the start of polymerization of the monomer to the recovery of the polymer described later. Examples of the coupling agent include compounds represented by the following formula (V).
R ⁵¹ _a ML _4-a (V)
(In the formula (V), R ⁵¹ represents an alkyl group, an alkenyl group, a cycloalkenyl group or an aryl group, M represents a silicon atom or a tin atom, L represents a halogen atom or a hydrocarbyloxy group, and a represents 0 to 0. Represents an integer of 2.)

As the coupling agent represented by the above formula (V), silicon tetrachloride, methyltrichlorosilane, dimethyldichlorosilane, trimethylchlorosilane, tin tetrachloride, methyltrichlorotin, dimethyldichlorotin, trimethylchlorotin, tetramethoxysilane, Examples thereof include methyltrimethoxysilane, dimethoxydimethylsilane, methyltriethoxysilane, ethyltrimethoxysilane, dimethoxydiethylsilane, diethoxydimethylsilane, tetraethoxysilane, ethyltriethoxysilane, and diethoxydiethylsilane.

The addition amount of the coupling agent is preferably 0.03 mol or more, more preferably 0.05 mol or more, per 1 mol of alkali metal derived from the alkali metal catalyst in order to improve the processability of the conjugated diene polymer. Moreover, in order to improve low fuel consumption, Preferably it is 0.4 mol or less, More preferably, it is 0.3 mol or less.

In the method for producing the conjugated diene polymer, an unreacted active terminal may be treated with an alcohol such as methanol or isopropyl alcohol before recovering the polymer described later.

As a method for recovering the conjugated diene polymer from the conjugated diene polymer hydrocarbon solution, a known method can be used. For example, (A) a method of adding a coagulant to the conjugated diene polymer hydrocarbon solution. (B) A method of adding steam to the hydrocarbon solution of the conjugated diene polymer (steam stripping treatment) can be mentioned. The recovered conjugated diene polymer may be dried by a known dryer such as a band dryer or an extrusion dryer.

In the conjugated diene polymer, the content of the structural unit derived from the polymerization initiator represented by the formula (I) is from the viewpoint of improving the fuel efficiency, breaking strength and processability in a balanced manner, Preferably, it is 0.0001 mmol / g polymer or more, more preferably 0.001 mmol / g polymer or more, preferably 0.15 mmol / g polymer or less, more preferably 0.1 mmol / g polymer or less. is there.

In the conjugated diene polymer, the content of the structural unit derived from the silicon-containing vinyl compound is preferably 0.01 mmol / per polymer unit mass from the viewpoint of improving the fuel efficiency, breaking strength and processability in a balanced manner. g polymer or more, more preferably 0.02 mmol / g polymer or more, preferably 0.4 mmol / g polymer or less, more preferably 0.2 mmol / g polymer or less.

（式（ＩＩｂ）中、ｍ、Ｒ^２１、Ｘ^１、Ｘ^２及びＸ^３は、式（ＩＩ）におけるものと同一である。） From the viewpoint of improving the fuel efficiency, breaking strength and processability in a balanced manner, the conjugated diene polymer preferably has a structural unit derived from the compound represented by the formula (II). In addition, the structural unit derived from the compound represented by the formula (II) in the conjugated diene polymer means a structural unit represented by the following formula (IIb).

(In the formula (IIb), m, R ²¹ , X ¹ , X ² and X ³ are the same as those in the formula (II).)

In the conjugated diene polymer according to the present invention, in the structural unit derived from the compound represented by formula (II) in the conjugated diene polymer, at least one of X ¹ , X ² and X ³ is substituted with a hydroxyl group. It is preferable that two or more are substituted with a hydroxyl group, and it is more preferable that two are substituted with a hydroxyl group. Thereby, the improvement effect of fuel-consumption property and breaking strength can be heightened. The method for substituting X ¹ , X ² and X ³ with a hydroxyl group is not particularly limited, and an example is a method by steam stripping treatment.
Further, from the viewpoint that particularly good processability is obtained, at least one of X ¹ , X ² and X ³ is preferably a substituted amino group, more preferably two or more are substituted amino groups, More preferably, two are substituted amino groups.

The conjugated diene polymer preferably has a structural unit (aromatic vinyl unit) derived from an aromatic vinyl compound from the viewpoint of improving fuel economy, breaking strength and processability in a balanced manner. When the conjugated diene polymer has an aromatic vinyl unit, the content of the aromatic vinyl unit in the conjugated diene polymer is such that the structural unit derived from the conjugated diene compound (conjugated diene unit) and the aromatic vinyl unit. And the total amount is preferably 10% by mass or more (content of the conjugated diene unit content compound is 90% by mass or less), more preferably 15% by mass or more (content of the conjugated diene unit is 85% by mass or less). Further, from the viewpoint of low fuel consumption, the content of the aromatic vinyl unit is preferably 50% by mass or less (the content of the conjugated diene unit is 50% by mass or more), more preferably 45% by mass or less (conjugated diene). The unit content is 55% by mass or more).

When the conjugated diene polymer has a structural unit based on an aromatic vinyl compound, the vinyl bond content (vinyl content) of the conjugated diene polymer is low fuel consumption, with the conjugated diene unit content being 100 mol%. From this viewpoint, it is preferably 80 mol% or less, more preferably 70 mol% or less. Moreover, from a workability viewpoint, Preferably it is 10 mol% or more, More preferably, it is 15 mol% or more, More preferably, it is 20 mol% or more, Most preferably, it is 40 mol% or more.

In particular, from the viewpoint of improving the breaking strength, the conjugated diene polymer preferably does not have an aromatic vinyl compound structural unit. In this case, the vinyl bond content (vinyl content) of the conjugated diene polymer. The conjugated diene unit content is 100 mol%, preferably 20 mol% or less, more preferably 15 mol% or less.

In addition, the vinyl bond amount of the said conjugated diene type polymer can be measured by the method as described in the Example mentioned later.

The molecular weight distribution of the conjugated diene polymer is preferably 1 to 5 and more preferably 1 to 2 in order to improve fuel efficiency. The molecular weight distribution is obtained by measuring the number average molecular weight (Mn) and the weight average molecular weight (Mw) by gel permeation chromatography (GPC) method and dividing Mw by Mn.

The conjugated diene polymer can be used in the rubber composition of the present invention as a rubber component.

The content of the conjugated diene polymer in 100% by mass of the rubber component is 90% by mass or less, preferably 60% by mass or less, more preferably 50% by mass or less, and further preferably 40% by mass or less. If it exceeds 90% by mass, the processability tends to decrease and the cost tends to increase. Further, the content of the conjugated diene polymer is preferably 5% by mass or more, more preferably 10% by mass or more, and further preferably 15% by mass or more. If the amount is less than 5% by mass, the effect of improving fuel economy tends to be difficult to obtain.

As another rubber component used in combination with the conjugated diene polymer, polyisoprene rubber can be preferably used. By blending the polyisoprene-based rubber, the breaking strength is improved, and the rubber is better packed at the time of kneading, so that productivity can be improved.

Examples of the polyisoprene rubber include natural rubber (NR) and polyisoprene rubber (IR). NR is not particularly limited. For example, SIR20, RSS # 3, TSR20, deproteinized natural rubber (DPNR), high purity natural rubber (HPNR), epoxidized natural rubber (ENR), etc., which are common in the tire industry Can be used. Similarly, IR that is common in the tire industry can be used.

When the rubber composition of the present invention contains a polyisoprene rubber, the content of the polyisoprene rubber in 100% by mass of the rubber component is preferably 10% by mass or more, more preferably 35% by mass or more, and further preferably 60% by mass or more. If it is less than 10% by mass, the fracture strength may be reduced, or the rubber may not be tightly kneaded at the time of kneading, so that productivity may be deteriorated. The content of the polyisoprene rubber is preferably 95% by mass or less, more preferably 90% by mass or less, and still more preferably 85% by mass or less. When the content of the polyisoprene rubber exceeds 95% by mass, the Mooney viscosity becomes too high, and the processability may be deteriorated.

Examples of the rubber component that can be used in addition to the polyisoprene rubber include conventional styrene-butadiene copolymer rubber (SBR), polybutadiene rubber (BR), butadiene-isoprene copolymer rubber, and butyl rubber. Moreover, an ethylene-propylene copolymer, an ethylene-octene copolymer, etc. can be mentioned.

The rubber composition of the present invention contains silica. The silica is not particularly limited, and examples thereof include dry process silica (anhydrous silica), wet process silica (hydrous silica), and wet process silica is preferable because of its large number of silanol groups.

The nitrogen adsorption specific surface area (N ₂ SA) of silica is preferably 40 m ² / g or more, more preferably 50 m ² / g or more. If it is less than 40 m ² / g, the reinforcing effect is small, and the fracture strength tends to decrease. Further, N ₂ SA of silica is preferably 400 m ² / g or less, more preferably 360 m ² / g or less, and still more preferably 300 m ² / g or less. When it exceeds 400 m < ² > / g, it will become difficult to disperse | distribute a silica and there exists a tendency for low-fuel-consumption property and workability to deteriorate.
The _N 2 SA of silica is a value determined by the BET method in accordance with ASTM D3037-93.

The content of silica (the total amount when two or more types of silica are used) is 5 parts by mass or more, preferably 15 parts by mass or more, more preferably 25 parts by mass or more, relative to 100 parts by mass of the rubber component. It is. If the amount is less than 5 parts by mass, the effect of blending silica cannot be sufficiently obtained, and the fracture strength tends to decrease. The content of silica is 40 parts by mass or less, preferably 35 parts by mass or less. If it exceeds 40 parts by mass, the workability tends to deteriorate.

Silica one kind may be used alone, it is preferable to use a combination of two or _{more, N} 2 SA is ^{40 m} 2 / g or more, 120 m and ² / g less than the silica _{(1), N} 2 SA is More preferably, 120 m ² / g or more of silica (2) is used in combination. By blending silica (1) and (2) together with the conjugated diene polymer, silica (1) and (2) can be dispersed well, and the improvement effect of each performance can be enhanced synergistically. It can greatly improve fuel efficiency and breaking strength. Moreover, the improvement effect of each performance can further be heightened by using silica (1) and (2) and the adhesion resin mentioned later together.

Silica (1) is not particularly limited, and for example, Ultrazil 360 manufactured by Degussa, Z40 manufactured by Rhodia, RP80 manufactured by Rhodia, and the like can be obtained. Similarly, the silica (2) is not particularly limited, and can be obtained as, for example, Zeosyl 1205MP manufactured by Rhodia. These may be used alone or in combination of two or more.

In silica (1) and (2), N ₂ SA preferably satisfies the following formula.
It is preferable to satisfy the relation of ≧ 1.4 _(N 2 SA of the silica (1)) (silica _(N 2 SA of 2)) /, of (Silica _(N 2 SA of 2)) / (silica (1) More preferably, the relationship of N ₂ SA) ≧ 2.0 is satisfied. If it is less than 1.4, the difference in particle diameter between silica (1) and (2) is small, and the dispersion improving effect by blending two types of silica tends to be insufficient.

N ₂ SA of silica (1) is 40 m ² / g or more, preferably 50 m ² / g or more. If it is less than 40 m ² / g, sufficient reinforcing properties cannot be obtained, and the fracture strength may be reduced. Also, _N 2 SA of the silica (1) is less than 120 m ² / g, preferably 100 m ² / g, more preferably at most ^{80 m} 2 / g. If it is 120 m ² / g or more, there is a possibility that the effect of the combined use of silica (1) and (2) cannot be obtained sufficiently.

N ₂ SA of silica (2) is 120 m ² / g or more, preferably 150 m ² / g or more. If it is less than 120 m ² / g, the effect of the combined use of silica (1) and (2) may not be sufficiently obtained. Also, _N 2 SA of the silica (2) is preferably 250 meters ² / g, more preferably at most 220 m ² / g. When it exceeds 250 m ² / g, fuel economy and processability tend to deteriorate.

The contents of silica (1) and (2) preferably satisfy the following formula.
(Content of silica (1)) × 0.06 ≦ (content of silica (2)) ≦ (content of silica (1)) × 15
If the content of silica (2) is less than 0.06 times the content of silica (1), sufficient rubber strength tends not to be obtained. Moreover, when content of a silica (2) exceeds 15 times of content of a silica (1), there exists a tendency for rolling resistance to increase. The content of silica (2) is more preferably 0.3 times or more and more preferably 0.5 times or more of the content of silica (1). Further, the content of silica (2) is more preferably 7 times or less, and further preferably 4 times or less, of the content of silica (1).

The content of silica (1) is preferably 5 parts by mass or more, more preferably 10 parts by mass or more, and further preferably 20 parts by mass or more with respect to 100 parts by mass of the rubber component. If it is less than 5 parts by mass, the fuel economy may not be sufficiently improved. Moreover, content of silica (1) becomes like this. Preferably it is 30 mass parts or less, More preferably, it is 25 mass parts or less. If it exceeds 30 parts by mass, the fuel efficiency is good, but the breaking strength tends to decrease.

The content of silica (2) is preferably 5 parts by mass or more, more preferably 10 parts by mass or more with respect to 100 parts by mass of the rubber component. If the amount is less than 5 parts by mass, sufficient fracture strength may not be obtained. Further, the content of silica (2) is preferably 20 parts by mass or less, more preferably 15 parts by mass or less. If it exceeds 20 parts by mass, the fracture strength is good, but the workability tends to deteriorate.

The total content of silica (1) and (2) is preferably 10 parts by mass or more, more preferably 15 parts by mass or more, and further preferably 20 parts by mass or more with respect to 100 parts by mass of the rubber component. If it is less than 10 parts by mass, there is a possibility that a sufficient reinforcing effect and rolling resistance reducing effect due to the blend of silica (1) and (2) cannot be obtained. The total content of silica (1) and (2) is preferably 40 parts by mass or less, more preferably 35 parts by mass or less. When the amount exceeds 40 parts by mass, it is difficult to uniformly disperse silica in the rubber composition, and not only the processability of the rubber composition is deteriorated but also rolling resistance may be increased.

The rubber composition of the present invention preferably contains a silane coupling agent usually used together with silica. The silane coupling agent is not particularly limited as long as it is conventionally used in the rubber industry. For example, bis (3-triethoxysilylpropyl) tetrasulfide, bis (2-triethoxysilyl) Ethyl) tetrasulfide, bis (4-triethoxysilylbutyl) tetrasulfide, bis (3-trimethoxysilylpropyl) tetrasulfide, bis (2-trimethoxysilylethyl) tetrasulfide, bis (4-trimethoxysilylbutyl) Tetrasulfide, bis (3-triethoxysilylpropyl) trisulfide, bis (2-triethoxysilylethyl) trisulfide, bis (4-triethoxysilylbutyl) trisulfide, bis (3-trimethoxysilylpropyl) trisulfide Bis (2-tri Methoxysilylethyl) trisulfide, bis (4-trimethoxysilylbutyl) trisulfide, bis (3-triethoxysilylpropyl) disulfide, bis (2-triethoxysilylethyl) disulfide, bis (4-triethoxysilylbutyl) Disulfide, bis (3-trimethoxysilylpropyl) disulfide, bis (2-trimethoxysilylethyl) disulfide, bis (4-trimethoxysilylbutyl) disulfide, 3-trimethoxysilylpropyl-N, N-dimethylthiocarbamoyltetra Sulfide, 3-triethoxysilylpropyl-N, N-dimethylthiocarbamoyl tetrasulfide, 2-triethoxysilylethyl-N, N-dimethylthiocarbamoyl tetrasulfide, 2-trimethoxysilylethyl-N N-dimethylthiocarbamoyl tetrasulfide, 3-trimethoxysilylpropylbenzothiazolyl tetrasulfide, 3-triethoxysilylpropylbenzothiazole tetrasulfide, 3-triethoxysilylpropyl methacrylate monosulfide, 3-trimethoxysilylpropyl methacrylate mono Sulfide type such as sulfide, 3-mercaptopropyltrimethoxysilane, 3-mercaptopropyltriethoxysilane, 2-mercaptoethyltrimethoxysilane, 2-mercaptoethyltriethoxysilane and other mercaptotypes, vinyltriethoxysilane, vinyltrimethoxy Vinyl-based silane, 3-aminopropyltriethoxysilane, 3-aminopropyltrimethoxysilane, 3- (2-aminoethyl) amino Amino group such as propyltriethoxysilane, 3- (2-aminoethyl) aminopropyltrimethoxysilane, γ-glycidoxypropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropylmethyl Glycidoxy type such as diethoxysilane, γ-glycidoxypropylmethyldimethoxysilane, nitro type such as 3-nitropropyltrimethoxysilane, 3-nitropropyltriethoxysilane, 3-chloropropyltrimethoxysilane, 3-chloropropyl Examples include chloro-based compounds such as triethoxysilane, 2-chloroethyltrimethoxysilane, and 2-chloroethyltriethoxysilane. These silane coupling agents may be used alone or in combination of two or more. Also good.

The content of the silane coupling agent is preferably 2 parts by mass or more and more preferably 5 parts by mass or more with respect to 100 parts by mass of silica (the total amount when two or more types of silica are used). If it is less than 2 parts by mass, the dispersibility of silica tends to deteriorate. Further, the content of the silane coupling agent is preferably 20 parts by mass or less, more preferably 15 parts by mass or less. If it exceeds 20 parts by mass, bleeding tends to occur.

The rubber composition of the present invention preferably contains an adhesive resin. By blending an adhesive resin with the conjugated diene polymer, the effect of improving each performance can be synergistically enhanced. Moreover, the improvement effect of each performance can further be heightened by using together adhesive resin and the above-mentioned silica (1) and (2).

Specific examples of the adhesive resin include phenolic resins and petroleum resins, and petroleum resins can be preferably used.

As the petroleum resin, for example, one obtained by polymerizing C5 petroleum hydrocarbon (C5 petroleum resin) can be used. Here, the C5-based petroleum hydrocarbon refers to a C5 fraction obtained by thermal decomposition of naphtha. Specifically, diolefins such as isoprene, 1,3-pentadiene, dicyclopentadiene, piperylene, Examples thereof include monoolefins such as 2-methyl-1-butene, 2-methyl-2-butene, and cyclopentene.

Petroleum resins, together with C5 petroleum hydrocarbons, are modified with styrene, o-methyl styrene, p-methyl styrene, p-tert-butyl styrene, 1,3-dimethyl styrene as monomer skeletons. , Α-methylstyrene, vinyl naphthalene, vinyl anthracene and other aromatic olefins may be polymerized to less than 50%.

The content of the adhesive resin is preferably 0.5 parts by mass or more, more preferably 0.8 parts by mass or more with respect to 100 parts by mass of the rubber component. If the amount is less than 0.5 parts by mass, good tackiness may not be obtained during tire production. Further, the content of the adhesive resin is preferably 3 parts by mass or less, more preferably 2 parts by mass or less. If it exceeds 3 parts by mass, it tends to harden and break easily during heat aging.

The rubber composition of the present invention preferably contains a softening agent. Examples of softeners include process oils such as paraffin oil, naphthenic oil, and aroma oil; castor oil, cottonseed oil, sesame oil, rapeseed oil, soybean oil, palm oil, palm oil, peanut oil, rosin, pine oil, pineapple , Vegetable oils such as tall oil, corn oil, rice bran oil, sesame oil, olive oil, sunflower oil, palm kernel oil, coconut oil, jojoba oil, macadamia nut oil, safflower oil, tung oil, etc., preferably process oil and more Aroma oil is preferred.

The content of the softening agent is preferably 1 part by mass or more, more preferably 1.5 parts by mass or more with respect to 100 parts by mass of the rubber component. If it is less than 1 part by mass, a good rubber fabric cannot be obtained, and the processability tends to deteriorate. The softener content is preferably 3 parts by mass or less, more preferably 2 parts by mass or less. If it exceeds 3 parts by mass, good fuel efficiency may not be obtained.

The total content of the adhesive resin and the softening agent is preferably 2 parts by mass or more, more preferably 2.5 parts by mass or more with respect to 100 parts by mass of the rubber component. If it is less than 2 parts by mass, a good rubber fabric cannot be obtained, and the processability tends to deteriorate. Further, the total content of the adhesive resin and the softening agent is preferably 5 parts by mass or less, more preferably 3 parts by mass or less. If it exceeds 5 parts by mass, the fuel efficiency tends to deteriorate.

The rubber composition of the present invention preferably contains carbon black. Carbon black includes furnace black (furnace carbon black) such as SAF, ISAF, HAF, MAF, FEF, SRF, GPF, APF, FF, CF, SCF and ECF; acetylene black (acetylene carbon black); FT and MT Thermal black (thermal carbon black) such as: Channel black (channel carbon black) such as EPC, MPC and CC; Graphite and the like. These can be used alone or in combination of two or more.

The iodine adsorption amount of carbon black is preferably 48 mg / g or more, more preferably 52 mg / g or more. If the iodine adsorption amount is less than 48 mg / g, sufficient breaking strength may not be obtained. Moreover, the iodine adsorption amount of carbon black is preferably 68 mg / g or less, more preferably 64 mg / g or less. When the iodine adsorption amount exceeds 68 mg / g, there is a possibility that good fuel efficiency cannot be obtained.
In addition, the iodine adsorption amount of carbon black is calculated | required by A method of JISK6217.

Carbon black has a dibutyl phthalate oil absorption (DBP oil absorption) of preferably 127 ml / g or more, more preferably 132 ml / g or more. If the DBP oil absorption is less than 127 ml / g, good breaking strength may not be obtained. The DBP oil absorption is 157 ml / g or less, preferably 154 ml / g or less. If the DBP oil absorption exceeds 157 ml / g, the hardness of the vulcanized rubber is so high that there is a risk of being injured during demolding.
In addition, the DBP oil absorption amount of carbon black is calculated | required by the measuring method of JISK6217-4.

The content of carbon black is preferably 20 parts by mass or more, more preferably 30 parts by mass or more with respect to 100 parts by mass of the rubber component. If the amount is less than 20 parts by mass, sufficient reinforcement may not be obtained. The content of carbon black is preferably 100 parts by mass or less, more preferably 60 parts by mass or less. If it exceeds 100 parts by mass, the fuel efficiency tends to deteriorate.

In addition to the rubber component, silica, adhesive resin, softener, and carbon black, the rubber composition of the present invention includes wax, anti-aging agent, stearic acid, zinc oxide, additive, commonly used in the tire industry. Various additives such as a vulcanizing agent and a vulcanization accelerator can be blended.

The rubber composition of the present invention is obtained by kneading (step (1)) 40 to 75% by mass of the rubber component, silica, and adhesive resin (step (2)). It is preferable that it is obtained by kneading the remainder. In the step (1), first, by kneading 40 to 75% by mass of the rubber component containing the conjugated diene polymer together with silica and an adhesive resin, the viscosity of the matrix (kneaded product) containing these is increased. Thereafter, in the step (2), the kneaded product obtained in the step (1) and the remainder of the rubber component (25 to 60% by mass of the rubber component) are kneaded so that only a small amount of silica is blended. However, silica can be dispersed well. Thereby, the improvement effect of low fuel consumption, fracture strength, and workability can be further enhanced.

(Process (1))
The compounding ratio of the rubber component in the step (1) is preferably 40% by mass or more, more preferably 45% by mass or more, and further preferably 50% by mass or more, with the total amount of rubber components used in all steps being 100% by mass. It is. If it is less than 40% by mass, the heat generation during kneading is too high, and there is a possibility that kneading cannot be performed sufficiently. Moreover, the compounding ratio of the rubber component in the step (1) is preferably 75% by mass or less, more preferably 65% by mass or less, and further preferably 55% by mass or less. If it exceeds 75% by mass, silica cannot be sufficiently dispersed, and there is a possibility that low fuel consumption, breaking strength and processability cannot be improved sufficiently.

In the step (1), it is preferable to knead the carbon black and the softening agent together with the rubber component, silica, and adhesive resin. Thereby, carbon black can be favorably dispersed together with silica. In addition to these, additives other than vulcanizing agents and vulcanization accelerators, such as waxes, anti-aging agents, stearic acid, and zinc oxide, are preferably kneaded in step (1).

(Process (2))
The compounding ratio of the rubber component in the step (2) is preferably 25% by mass or more, preferably 35% by mass or more, more preferably 45% by mass or more, with the total amount of the rubber components used in all steps being 100% by mass. is there. If the blending ratio of the rubber component is less than 25% by mass, the silica cannot be sufficiently dispersed, and the effect of improving the breaking strength and fuel economy may not be sufficiently obtained. Moreover, the compounding ratio of the rubber component in the step (2) is preferably 60% by mass or less, more preferably 55% by mass or less, and further preferably 50% by mass or less. If it exceeds 60% by mass, the amount of heat generated in the step (1) increases, and there is a possibility that the kneading cannot be sufficiently performed in the step (1).

In addition, it is preferable to mix | blend the kneaded material kneaded by process (2), vulcanizing agents, such as sulfur, and a vulcanization accelerator as process (3) after process (1) and (2).

The rubber composition of the present invention can be used for each member of a tire. Especially, it can use suitably for a breaker from the point that low fuel consumption property and breaking strength can be improved, maintaining workability favorable.

The pneumatic tire of the present invention is produced by a usual method using the rubber composition. That is, a rubber composition blended with various additives as necessary is extruded according to the shape of a tire breaker and the like at an unvulcanized stage, and molded by a normal method on a tire molding machine, Bonding together with other tire members forms an unvulcanized tire. This unvulcanized tire can be heated and pressurized in a vulcanizer to produce the pneumatic tire of the present invention.

The pneumatic tire of the present invention can be suitably used as a tire for passenger cars.

The present invention will be specifically described based on examples, but the present invention is not limited to these examples.

２，６−ジ−ｔｅｒｔ−ブチル−ｐ−クレゾール：大内新興化学工業（株）製のノクラック２００
Ｎ−（３−ジメチルアミノプロピル）アクリルアミド：東京化成工業（株）製
３−ジエチルアミノプロピルトリエトキシシラン：アヅマックス（株）製
ｓｅｃ−ブチルリチウム溶液：関東化学（株）製（１．０ｍｏｌ／Ｌ）
シクロヘキサン：関東化学（株）製 Hereinafter, various chemicals used at the time of synthesis and polymerization will be described together. In addition, the chemical | medical agent refine | purified according to the usual method as needed.
THF: anhydrous tetrahydrofuran hydride manufactured by Kanto Chemical Co., Ltd .: diethylamine manufactured by Kanto Chemical Co., Ltd .: methyl vinyl dichlorosilane manufactured by Kanto Chemical Co., Ltd .: anhydrous hexane manufactured by Shin-Etsu Chemical Co., Ltd .: styrene manufactured by Kanto Chemical Co., Ltd. : Kanto Chemical Co., Ltd. Butadiene: Tokyo Chemical Industry Co., Ltd. 1,3-Butadiene TMEDA: Kanto Chemical Co., Ltd. tetramethylethylenediamine n-butyllithium solution: Kanto Chemical Co., Ltd. 1.6M n- Butyllithium hexane solution initiator (1): Compound obtained by binding two units of structural units derived from isoprene to AI-200CE2 (3- (N, N-dimethylamino) -1-propyllithium manufactured by FMC Compound)) (0.9M)

2,6-di-tert-butyl-p-cresol: NOCRACK 200 manufactured by Ouchi Shinsei Chemical Co., Ltd.
N- (3-dimethylaminopropyl) acrylamide: manufactured by Tokyo Chemical Industry Co., Ltd. 3-diethylaminopropyltriethoxysilane: manufactured by Amax Co., Ltd. sec-butyllithium solution: manufactured by Kanto Chemical Co., Inc. (1.0 mol / L)
Cyclohexane: manufactured by Kanto Chemical Co., Inc.

<Preparation of modifier (1) (terminal modifier)>
Under a nitrogen atmosphere, 15.6 g of N- (3-dimethylaminopropyl) acrylamide was placed in a 100 ml volumetric flask, and anhydrous hexane was added to make a total volume of 100 ml.

<Preparation of modifier (2) (main chain modifier)>
1000 mL of THF and 13 g of sodium hydride were added to a 2 L three-necked flask thoroughly purged with nitrogen, and 36.5 g of diethylamine was slowly added dropwise with stirring on an ice-water bath. After stirring for 30 minutes, 36 g of methylvinyldichlorosilane was added dropwise over 30 minutes and stirred for 2 hours. The resulting solution was concentrated, filtered, and purified by distillation under reduced pressure to synthesize bis (diethylamino) methylvinylsilane. 21.4 g of the obtained bis (diethylamino) methylvinylsilane was placed in a 100 ml volumetric flask under a nitrogen atmosphere, and anhydrous hexane was further added to make a total volume of 100 ml.

<Preparation of modifier (3) (terminal modifier)>
Under a nitrogen atmosphere, 27.7 g of 3-diethylaminopropyltriethoxysilane was placed in a 100 ml volumetric flask, and anhydrous hexane was added to make a total volume of 100 ml.

<Analysis of copolymer>
The copolymer (conjugated diene polymer) obtained by the following was analyzed by the following method.

<Measurement of weight average molecular weight Mw and number average molecular weight Mn>
The weight average molecular weight Mw and number average molecular weight Mn of the copolymer are gel permeation chromatograph (GPC) (GPC-8000 series, manufactured by Tosoh Corp., detector: differential refractometer, column: TSKGEL manufactured by Tosoh Corp.) Based on the measured value by SUPERMALTPORE HZ-M), it was determined as a standard polystyrene equivalent value. From the measurement results, the molecular weight distribution Mw / Mn was calculated.

<Structural identification of copolymer>
The structure identification (styrene content, vinyl content) of the copolymer was performed using a JNM-ECA series apparatus manufactured by JEOL Ltd. The measurement was conducted after drying under reduced pressure, 0.1 g of the polymer dissolved in 15 ml of toluene, slowly poured into 30 ml of methanol and reprecipitated.

<Synthesis of Copolymer A>
In a 30 L pressure vessel sufficiently purged with nitrogen, 18 L of n-hexane, 600 g of styrene, 1400 g of butadiene, 40 mL of modifier (2) and 10 mmol of TMEDA were added, and the temperature was raised to 40 ° C. Next, 19 ml of initiator (1) was added, and then the temperature was raised to 50 ° C. and stirred for 3 hours. Next, 20 mL of the modifier (1) was added and stirred for 30 minutes. After adding 15 mL of methanol and 0.1 g of 2,6-tert-butyl-p-cresol to the reaction solution, the polymer solution was evaporated at room temperature for 24 hours and then dried under reduced pressure to obtain copolymer A. . The silicon-containing vinyl compound (modifier (2)) added was 0.43 g per 100 g of the monomer component. The charged polymerization initiator (initiator (1)) was 0.85 mmol per 100 g of the monomer component. The amount of the nitrogen atom and / or silicon atom-containing compound (modifier (1)) added was 1.18 mol per 1 mol of the alkali metal derived from the added polymerization initiator.

<Synthesis of Copolymer B>
In a 30 L pressure vessel sufficiently purged with nitrogen, 18 L of n-hexane, 600 g of styrene, 1400 g of butadiene, 40 mL of modifier (2) and 10 mmol of TMEDA were added, and the temperature was raised to 40 ° C. Next, 19 ml of initiator (1) was added, and then the temperature was raised to 50 ° C. and stirred for 3 hours. Next, 20 mL of the modifier (1) was added and stirred for 30 minutes. After adding 15 mL of methanol and 0.1 g of 2,6-tert-butyl-p-cresol to the reaction solution, the aggregate is recovered from the polymer solution by a steam stripping treatment, and the obtained aggregate is dried under reduced pressure for 24 hours. Copolymer B was obtained. The silicon-containing vinyl compound (modifier (2)) added was 0.43 g per 100 g of the monomer component. The charged polymerization initiator (initiator (1)) was 0.85 mmol per 100 g of the monomer component. The amount of the nitrogen atom and / or silicon atom-containing compound (modifier (1)) added was 1.18 mol per 1 mol of the alkali metal derived from the added polymerization initiator.

<Synthesis of Copolymer C>
Copolymer C was obtained by the same formulation as the synthesis of Copolymer A, except that 20 mL of the modifier (1) was changed to 20 mL of the modifier (3). The silicon-containing vinyl compound (modifier (2)) added was 0.32 g per 100 g of the monomer component. The charged polymerization initiator (initiator (1)) was 0.85 mmol per 100 g of the monomer component. The amount of the nitrogen atom and / or silicon atom-containing compound (modifier (3)) added was 1.18 mol per 1 mol of the alkali metal derived from the added polymerization initiator.

<Synthesis of Copolymer D>
When recovering the aggregate from the polymer solution, the polymer solution was synthesized at the same time as the copolymer C except that the polymer solution was evaporated at room temperature for 24 hours and then dried under reduced pressure, instead of recovering the aggregate by steam stripping treatment. Copolymer D was obtained by the same formulation. The silicon-containing vinyl compound (modifier (2)) added was 0.32 g per 100 g of the monomer component. The charged polymerization initiator (initiator (1)) was 0.85 mmol per 100 g of the monomer component. The amount of the nitrogen atom and / or silicon atom-containing compound (modifier (3)) added was 1.18 mol per 1 mol of the alkali metal derived from the added polymerization initiator.

The monomer components of the copolymers A to D are summarized in Table 1.

Below, various chemical | medical agents used by the Example and the comparative example are demonstrated.
NR: SIR20
Copolymers A to D (modified SBR): carbon black synthesized by the above method: N351H manufactured by Cabot Japan Co., Ltd. (iodine adsorption amount: 58 mg / g, DBP oil absorption amount: 137 ml / 100 g)
Silica 1: Ultrazil 360 manufactured by Degussa (N ₂ SA: 50 m ² / g)
Silica 2: Zeosyl 1205MP (N ₂ SA: 200 m ² / g) manufactured by Rhodia
Silane coupling agent: Si75 (bis (triethoxysilylpropyl) disulfide) manufactured by Degussa
Zinc oxide: Zinc Cox Super F-2 (average primary particle size: 65 nm) manufactured by Hakusui Tech Co., Ltd.
Stearic acid: Stearic acid “椿” manufactured by NOF Corporation
Anti-aging agent: Antigen 6C (N- (1,3-dimethylbutyl) -N′-phenyl-p-phenylenediamine) manufactured by Sumitomo Chemical Co., Ltd.
Adhesive resin: Hilets G-100 manufactured by Mitsui Chemicals, Inc.
Aroma oil: Diana Process AH-24 manufactured by Idemitsu Kosan Co., Ltd.
Wax: Sunnock N manufactured by Ouchi Shinsei Chemical Industry Co., Ltd.
Sulfur: Powder sulfur vulcanization accelerator manufactured by Karuizawa Sulfur Co., Ltd. CZ: Noxeller CZ (N-cyclohexyl-2-benzothiazolylsulfenamide) manufactured by Ouchi Shinsei Chemical Co., Ltd.
Vulcanization accelerator DPG: Noxeller D (diphenylguanidine) manufactured by Ouchi Shinsei Chemical Industry Co., Ltd.

(Examples and Comparative Examples)
In accordance with the composition shown in Tables 2 to 5, materials other than sulfur and a vulcanization accelerator were kneaded for 5 minutes at 150 ° C. using a 1.7 L Banbury mixer manufactured by Kobe Steel, Ltd., and mixed. A kneaded paste was obtained. Next, sulfur and a vulcanization accelerator were added to the obtained kneaded product, and kneaded for 5 minutes under the condition of 80 ° C. using an open roll to obtain an unvulcanized rubber composition. The obtained unvulcanized rubber composition was press vulcanized at 160 ° C. for 20 minutes to obtain a vulcanized rubber composition.

<Evaluation items and test methods>
<Rolling resistance>
Using a viscoelastic spectrometer VES (manufactured by Iwamoto Seisakusho Co., Ltd.), tan δ of the above vulcanized rubber composition was measured under the conditions of a temperature of 70 ° C., an initial strain of 10%, and a dynamic strain of 2%. The tan δ was set to 100, and the index was expressed by the following calculation formula. Larger values indicate lower rolling resistance and better fuel efficiency.
(Rolling resistance index) = (tan δ of Comparative Example 1) / (tan δ of each formulation) × 100

<Destructive strength>
A No. 3 dumbbell-type rubber test piece was prepared using the above vulcanized rubber composition, and a tensile test was conducted according to JIS K6251: 2010 “Vulcanized rubber and thermoplastic rubber-Determination of tensile properties”. TB) and elongation at break (EB) were measured, and the product (TB × EB) was calculated. And the comparative example 1 was set to 100, and the breaking strength (TBxEB) of each compounding was indicated by an index by the following calculation formula. The larger the value, the better the fracture strength.
(Fracture strength index) = (TB × EB of each formulation) / (TB × EB of Comparative Example 1) × 100

<Processability>
In accordance with JIS K 6300-1: 2001 "Unvulcanized rubber-Physical properties-Part 1: Determination of viscosity and scorch time by Mooney viscometer", heat by preheating for 1 minute using a Mooney viscosity tester. Under the temperature condition of 130 ° C., the small rotor was rotated, and the Mooney viscosity (ML _{1 +} 4/130 ° C.) of the unvulcanized rubber composition after 4 minutes was measured. The result is expressed as an index, and the larger the value, the lower the Mooney viscosity and the better the workability. If it is 90 or more, there is no problem. The index was calculated by the following formula.
(Processability index) = (Mooney viscosity of Comparative Example 1) / (Mooney viscosity of each formulation) × 100

<Filler dispersibility>
Thin sections of the rubber composition were prepared using a frozen cutting microtome, and the ratio of undispersed carbon black and silica was calculated using a microscope. The results are shown as an index with Comparative Example 1 as 100. The larger the value, the better the filler is dispersed. If it is 90 or more, there is no problem.

As shown in Tables 2 to 5, the examples have a specific amine structure at the initiation terminal, a structural unit derived from a silicon-containing compound in the main chain portion, and a nitrogen atom and / or a silicon atom at the termination terminal. Because it contains specific amounts of conjugated diene copolymer having a structural unit derived from the compound and silica, the fuel efficiency, breaking strength and processability are improved in a well-balanced manner compared to the rubber composition of the comparative example. It was done.

Example 1, etc., in which two types of silica having a specific nitrogen adsorption specific surface area are blended together with the above conjugated diene polymer, have particularly good performance, and have low fuel consumption while ensuring excellent processability. And the breaking strength was greatly improved.

Claims (10)

At the active terminal of the copolymer obtained by polymerizing a monomer component containing a conjugated diene compound and a silicon-containing vinyl compound using a polymerization initiator represented by the following formula (I), a nitrogen atom and / or a silicon atom A conjugated diene polymer obtained by reacting a compound containing
Silica and
In 100% by mass of the rubber component, the content of the conjugated diene polymer is 90% by mass or less,
The rubber composition whose content of the said silica is 5-40 mass parts with respect to 100 mass parts of said rubber components.

(In Formula (I), i is 0 or 1, R ¹¹ represents a hydrocarbylene group having 1 to 100 carbon atoms, R ¹² and R ¹³ are hydrocarbyl groups which may have a substituent, Alternatively, it represents a trihydrocarbylsilyl group, or R ¹² and R ¹³ are bonded to each other and have at least one atom selected from the atomic group consisting of a silicon atom, a nitrogen atom and an oxygen atom as a hetero atom. Represents an optionally hydrocarbylene group, and M represents an alkali metal atom.) The rubber composition according to claim 1, wherein R ^{11 in the} formula (I) is a group represented by the following formula (Ia).

(In formula (Ia), R ¹⁴ represents a hydrocarbylene group composed of a structural unit derived from a conjugated diene compound and / or a structural unit derived from an aromatic vinyl compound, and n represents an integer of 1 to 10.) The rubber composition according to claim 2, wherein R ^{14 in the} formula (Ia) is a hydrocarbylene group composed of 1 to 10 structural units derived from isoprene. The rubber composition according to any one of claims 1 to 3, wherein the silicon-containing vinyl compound is a compound represented by the following formula (II).

(In the formula (II), m is 0 or 1, R ²¹ represents a hydrocarbylene group, and X ¹ , X ² and X ³ have a substituted amino group, a hydrocarbyloxy group, or a substituent. Represents a good hydrocarbyl group.) The rubber composition according to any one of claims 1 to 4, wherein the conjugated diene polymer has a structural unit derived from an aromatic vinyl compound. The rubber composition according to claim 1, wherein the silica has a nitrogen adsorption specific surface area of 40 to 400 m ² / g. The silica, the nitrogen adsorption specific surface area of ^{40 m} 2 / g or more, according to claim 6, including a 120 m ² / g than silica (1), the nitrogen adsorption specific surface area and 120 m ² / g or more silica (2) The rubber composition according to any one of the above. Including adhesive resin,
The silica, the nitrogen adsorption specific surface area of ^{40 m} 2 / g or more, 120 m ² / g less than the silica (1), according to claim 1 to 7 nitrogen adsorption specific surface area comprising a 120 m ² / g or more silica (2) The rubber composition according to any one of the above. The rubber composition according to claim 7 or 8, wherein a nitrogen adsorption specific surface area and a content of the silica (1) and (2) satisfy the following formula.
(Nitrogen adsorption specific surface area of silica (2)) / (Nitrogen adsorption specific surface area of silica (1)) ≧ 1.4
(Content of silica (1)) × 0.06 ≦ (content of silica (2)) ≦ (content of silica (1)) × 15 The pneumatic tire produced using the rubber composition in any one of Claims 1-9.