WO2005021637A1 - 共役ジエン系ゴム組成物、その製造方法およびゴム架橋物 - Google Patents
共役ジエン系ゴム組成物、その製造方法およびゴム架橋物 Download PDFInfo
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- WO2005021637A1 WO2005021637A1 PCT/JP2004/012660 JP2004012660W WO2005021637A1 WO 2005021637 A1 WO2005021637 A1 WO 2005021637A1 JP 2004012660 W JP2004012660 W JP 2004012660W WO 2005021637 A1 WO2005021637 A1 WO 2005021637A1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L19/00—Compositions of rubbers not provided for in groups C08L7/00 - C08L17/00
- C08L19/006—Rubber characterised by functional groups, e.g. telechelic diene polymers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
- B60C1/0016—Compositions of the tread
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D405/00—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom
- C07D405/02—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom containing two hetero rings
- C07D405/12—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom containing two hetero rings linked by a chain containing hetero atoms as chain links
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D417/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00
- C07D417/02—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00 containing two hetero rings
- C07D417/06—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00 containing two hetero rings linked by a carbon chain containing only aliphatic carbon atoms
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D417/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00
- C07D417/14—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00 containing three or more hetero rings
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D513/00—Heterocyclic compounds containing in the condensed system at least one hetero ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for in groups C07D463/00, C07D477/00 or C07D499/00 - C07D507/00
- C07D513/02—Heterocyclic compounds containing in the condensed system at least one hetero ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for in groups C07D463/00, C07D477/00 or C07D499/00 - C07D507/00 in which the condensed system contains two hetero rings
- C07D513/04—Ortho-condensed systems
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L21/00—Compositions of unspecified rubbers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
- C08L83/10—Block- or graft-copolymers containing polysiloxane sequences
Definitions
- the present invention relates to a conjugated rubber composition, a method for producing the same, and a crosslinked rubber composition.
- an uncrosslinked rubber composition having excellent processability can be obtained when silica is blended, and a synergistic agent capable of providing a rubber crosslinked material having excellent low heat build-up, wet grip properties and abrasion resistance.
- the present invention relates to a rubber composition, a production method thereof, and a cross-linked rubber product obtained by cross-linking the same.
- the rubber composition containing silica is excellent in low heat build-up as compared with the rubber composition containing carbon black which is usually used, a fuel-efficient tire can be manufactured by using the rubber composition.
- a silica-containing rubber composition of a rubbery polymer obtained by lithiating a gen-based rubber polymer with an organolithium compound and then reacting with a silicon-containing compound has been proposed (see Patent Document 1).
- a rubber composition comprising a silanol group-containing gen-based polymer and a special carbon black having silica fixed on its surface has been proposed (Patent Documents).
- the rubber composition as described above has improved low heat build-up, the uncrosslinked silica-containing rubber composition has poor processability, and the crosslinked product has poor balance between wet grip performance and abrasion resistance. was there.
- a polyorganosiloxane having a specific functional group is added to a gen-based polymer having an active terminal of an alkali metal obtained by polymerization by using an alkali metal polymerization initiator, and an alkali metal polymerization initiator 1
- a silica-containing rubber composition of a polyonoleganosiloxane-modified gen-based polymer obtained by reacting the polyorganosiloxane in an amount of 0.1 to 2 mol per mol is proposed (Patent Reference 3).
- a silsesquioxane conjugate having a polyhedral structure and a gen-based polymer having an alkali metal active terminal obtained by polymerization using an alkali metal polymerization initiator is added to 1 mole of an alkali metal polymerization initiator.
- a rubber composition containing a silsesquioxane-modified gen-based polymer obtained by reacting the cinoresesquioxane compound in an amount of 0.1 to 1.5 mol has been proposed. Patent Document 4).
- the above-mentioned polyorganosiloxane-modified gen-based polymer and silsesquioxane-modified gen-based polymer have excellent balance between low heat build-up and wet grip properties, but are not crosslinked silica.
- the compounded rubber composition was inferior in processability, and the crosslinked product was sometimes inferior in abrasion resistance.
- Patent Document 1 JP-A-10-7702
- Patent Document 2 JP-A-10-316800
- Patent Document 3 JP-A-9-110904
- Patent Document 4 JP-A-2002-80534
- an object of the present invention is to obtain an uncrosslinked rubber composition having excellent processability when silica is blended, and to provide low heat build-up, wet grip properties, abrasion resistance, and the like.
- An object of the present invention is to provide a conjugated rubber composition capable of providing a crosslinked product having excellent tensile strength, a method for producing the same, and a crosslinked rubber product.
- the present inventors have made intensive efforts to achieve the above object, and as a result, a branched structure having a structure in which at least three or more conjugated gen-based polymer chains are bonded via a polyonoreganosiloxane.
- silica is compounded in a conjugated rubber composition containing a specific amount of a conjugated rubber and a conjugated rubber obtained by reacting a compound having a specific functional group in the molecule, an uncrosslinked rubber composition having excellent processability can be obtained.
- the product was obtained, and the crosslinked product was found to be excellent in low heat build-up, wet grip, abrasion resistance and tensile strength. Based on this finding, the present invention was completed.
- a conjugated diene rubber composition comprising 95,000,000 to 5% by weight of a conjugated diene rubber (B) of 3,000,000.
- R 1 to R 8 are an alkyl group having 16 to 16 carbon atoms or an aryl group having 6 to 12 carbon atoms, which may be the same or different.
- X 1 and X 4 are (i) a functional group, a part of which reacts with the active metal at the chain end of the active conjugated polymer, The remainder is a group derived from the functional group or a single bond, or (ii) an alkyl group having 1 to 6 carbon atoms or an aryl group having 6 to 12 carbon atoms, and X 1 and X 4 are the same as each other. Or may be different.
- X 2 is partly a functional group which reacts with active conjugated diene polymer chain end of the active metal, the remainder is a group or a single bond derived from the said functional groups.
- X 3 is a group containing 220 repeating units of alkylene glycol, and a part of X 3 may be a group derived from a group containing 2-20 repeating units of alkylene glycol.
- m is an integer from 3 to 200
- n is an integer from 0 to 200
- k is an integer from 0 to 200.
- R 9 to R 16 are an alkyl group having 16 carbon atoms or an aryl group having 6 to 12 carbon atoms, which may be the same or different.
- X 5 — X 8 is a functional group partially reacting with the active metal at the terminal of the active conjugated polymer, and the remainder is a group or a single bond derived from the functional group.
- R 1 R iy represents an alkyl group having 16 to 16 carbon atoms or an aryl group having 6 to 12 carbon atoms, which may be the same or different.
- X 9 —X 11 is a functional group partially reacting with the active metal at the end of the chain of the active conjugated diene polymer, and the remainder is a group or a single bond derived from the functional group. s is an integer of 118.
- X 1 —X 11 is a polyorganosiloxane defined as described above, after the reaction) Of polyorganosiloxane ")
- a method for producing the conjugated diene rubber composition that is, a method for producing the following (I) and (II).
- the activity of the active conjugated polymer chain end in an amount of more than 0.001 and less than 0.1 mole per mole of the organic active metal used in the polymerization.
- X 1 and X 4 represent a force that is a functional group that reacts with the active metal at the chain end of the active conjugated polymer, or an alkyl group having 16 carbon atoms. Or an aryl group having 6 to 12 carbon atoms, X 2 is a functional group which reacts with the active metal at the terminal of the active conjugated polymer, and X 3 contains a repeating unit of 2 to 20 alkylene glycol. It is a group.
- X 5 to X 8 are functional groups that react with the active metal at the chain end of the active conjugated diene polymer.
- X 9 —X 11 is a functional group that reacts with the active metal at the chain end of the active conjugated polymer.
- X 1 to X 11 are referred to as “pre-reaction polyorganosiloxanes”.
- C 0 group
- C S group, amino group, imino group, epoxy group, pyridyl group, alkoxy group
- a compound having at least one functional group selected from the group consisting of a halogen group and a halogen is reacted, and then 10 to 100% by weight of the remaining active conjugated polymer chain and the remaining organic active metal 1
- a cross-linked rubber obtained by cross-linking the conjugated gen-based rubber composition.
- a branched conjugated gen-based rubber having a structure in which at least three or more conjugated gen-based polymer chains are bonded via a polyonoreganosiloxane, and a specific functional group introduced into the molecule.
- the conjugated rubber composition of the present invention comprising The rubber cross-linked product has excellent heat build-up properties, low heat build-up, wet grip properties, abrasion resistance and bow strength.
- the conjugated diene rubber (A) contained in the conjugated diene rubber composition of the present invention is a polyorgano rubber wherein at least three or more conjugated diene polymer chains are represented by the above general formulas (1), (2) and (3). It is a conjugated diene rubber having a structure linked through at least one selected from siloxane (polyorganosiloxane after reaction) and having a weight average molecular weight of 1,000 to 3,000,000. .
- the polymer chain constituting the conjugated gen-based rubber is preferably a homopolymer chain of a conjugated gen monomer or a copolymer chain of a conjugated gen monomer and an aromatic butyl monomer. More preferably, it is composed of 50-100% by weight of a monomer unit of the maize synergist and 50-0% by weight of an aromatic vinyl monomer unit.
- the conjugated gen-based polymer chain is particularly preferably a copolymer chain of a conjugated gen monomer and an aromatic butyl monomer. 50-95% by weight of monomer units, preferably 55-90% by weight, more preferably 6085% by weight, and aromatic butyl monomer units 50-5% by weight, preferably 45-10% by weight, more preferably Ranges from 40 to 15% by weight.
- the bonding mode of the conjugated diene monomer unit and the aromatic vinyl monomer unit can be various bonding modes such as a block shape, a tapered shape, and a random shape.
- the chain distribution of the aromatic vinyl monomer copolymerized with the conjugated monomer is not particularly limited.
- the single chain of the aromatic vinyl monomer in the entire chain of the body is preferably 40 to 100% by weight, more preferably 60 to 90% by weight, a crosslinked product excellent in low heat build-up can be obtained.
- the content of a long chain in which eight or more aromatic vinyl monomer units are connected is preferably 10% by weight or less, more preferably 3% by weight or less.
- the content of the bullet bond in the conjugated diene monomer unit is not particularly limited, and is usually 5 to 95. %, Preferably 20-80% by weight, more preferably 30-70% by weight, particularly preferably 35-65% by weight.
- the Bull bond content is relatively high, a crosslinked product having a better balance between low heat build-up and wet grip properties can be obtained.
- the vinyl bond content is relatively medium, a crosslinked product having an excellent balance between wet grip properties and abrasion resistance can be obtained.
- the glass transition temperature of the conjugated diene rubber (A) is not particularly limited, but is usually -120 20 ° C, preferably -100-10 ° C, and more preferably -90-1-20. C.
- the glass transition temperature is relatively high, a crosslinked product having low heat build-up, excellent tensile strength and excellent wet grip properties can be obtained.
- the glass transition temperature is relatively low, a crosslinked product having low heat build-up, excellent tensile strength and excellent wear resistance can be obtained.
- Examples of the conjugated diene monomer include 1,3-butadiene, 2-methyl-1,3-butadiene, 2,3-dimethinolane 1,3-butadiene, and 1,3-pentadiene. Of these, 1,3-butadiene and 2-methyl-1,3-butadiene are preferred, and 1,3-butadiene is particularly preferred. These can be used alone or in combination of two or more.
- aromatic biel monomer examples include styrene, ⁇ -methylstyrene, 2-methylstyrene, 3-methylstyrene, 4-methylstyrene, 2,4-diisopropylstyrene, 2,4-dimethylstyrene, 4-t-butylstyrene, — T-butyl-2-methylstyrene, 4_t-butoxystyrene, dimethylaminomethylstyrene, dimethylaminoethylstyrene and the like. Of these, styrene is preferred. These can be used alone or in combination of two or more.
- the conjugated gen-based polymer chain may be any other monomer unit other than the conjugated gen monomer unit and the aromatic vinyl monomer unit within a range that does not substantially impair the effects of the present invention. May be included.
- Other monomers include, for example, ethylenically unsaturated carboxylate monomers such as isopropyl (meth) acrylate, n-butyl (meth) acrylate, and dimethylaminopropyl (meth) acrylate.
- olefin monomers such as propylene, isobutylene and butylcyclohexane; and non-conjugated dimers such as 1,4-pentagen and 1,4-hexadiene.
- the amount of these monomer units is preferably 10% by weight or less. % Or less is more preferable.
- the conjugated diene rubber (A) is obtained by reacting at least three or more of the conjugated diene polymer chains represented by the general formulas (1), (2) and (3). It has a structure linked through at least one kind selected from the following.
- R 1 to R 8 are an alkyl group having 1 to 16 carbon atoms or an aryl group having 6 to 12 carbon atoms, which may be the same or different.
- X 1 and X 4 each represent (i) a functional group partially reacting with the active metal at the terminal of the active conjugated diene polymer chain, and the remainder being a group or a single bond derived from the functional group or (Ii) an alkyl group having 16 carbon atoms or an aryl group having 612 carbon atoms, and X 1 and X 4 may be the same or different.
- X 2 is partly a functional group which reacts with active metals of the active conjugated diene polymer chain end, balance, Ru group or a single bond der derived from said functional group.
- X 3 is a group containing 2 to 20 alkylene glycol repeating units, and a part of X 3 may be a group derived from a group containing 2 to 20 alkylene glycol repeating units. mi is an integer from 3 to 200, ⁇ is an integer from 0 to 200, ki is an integer from 0 to 200.
- Examples of the alkyl group having 16 carbon atoms constituting X 1 and X 4 include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, a butyl group, a pentyl group, a hexyl group, and a cycloalkyl group. Hexinole group and the like.
- Examples of the aryl group having 6 to 12 carbon atoms include a phenyl group and a methylphenyl group. Among these alkyl groups and aryl groups, a methyl group is particularly preferred.
- Examples of the functional group that reacts with the active metal at the terminal of the active conjugated polymer chain constituting xx 2 and X 4 include an alkoxyno group having 15 to 15 carbon atoms, a hydrocarbon group containing a 2_pyrrolidonyl group, and Epoxy-containing groups having 4 to 12 carbon atoms are preferred.
- the ⁇ group derived from the functional group (functional group that reacts with the active metal at the active conjugated polymer chain terminal) '' refers to having an active metal at the polymer chain terminal.
- alkoxy group having 115 carbon atoms examples include a methoxy group, an ethoxy group, a propoxy group, an isopropoxy group, and a butoxy group. Of these, a methoxy group is preferred.
- hydrocarbon group having a 2_pyrrolidonyl group a group represented by the following general formula (4) is preferably exemplified.
- j is an integer from 2-10.
- those having j force ⁇ ⁇ ⁇ ⁇ are preferred.
- the C4-C12 group having an epoxy group is represented by the following general formula (5).
- Z is a C1-C10 alkylene group or alkylarylene group
- Y is a methylene group, a sulfur atom or an oxygen atom
- E is an epoxy group-containing C2-C10 hydrocarbon group. It is. Among these, those in which Y is an oxygen atom are preferred, those in which Y is an oxygen atom, and those in which E is a glycidyl group are more preferred.
- Z is an alkylene group having 3 carbon atoms, Y is an oxygen atom, and And E is particularly preferably a glycidinole group.
- part of X 1 and / or X 4 is an alkoxyl group having 15 to 15 carbon atoms, a hydrocarbon group containing a 2-pyrrolidonyl group, and a carbon number 4 containing an epoxy group.
- the remainder is a group derived from the functional group or a single bond.
- X 2 is a group partially selected from an alkoxyl group having 15 to 15 carbon atoms, a hydrocarbon group containing a 2_pyrrolidonyl group, and a group having 4 to 12 carbon atoms containing an epoxy group, The remainder is a group or a single bond derived from the functional group.
- X 1 , X 2 and X 4 is a C 4-12 group containing an epoxy group
- the reaction of an active conjugated polymer chain with a polyorganosiloxane forms an epoxy ring.
- the constituent oxygen-carbon bond is cleaved to form a structure in which a conjugated gen-based polymer chain is bonded to the carbon atom.
- X 1 and X 4 are, among those described above, an epoxy group-containing C 4-12 group and a group derived therefrom.
- X is preferably an alkyl group having 16 carbon atoms.
- X 2 is preferably an epoxy group-containing group having 412 carbon atoms or a group derived therefrom.
- X 3 that is, a group containing 2 to 20 alkylene glycol repeating units, is preferably a group represented by the following general formula (6).
- t is an integer of 2-20
- P is an alkylene group or an alkyl group having 2-10 carbon atoms.
- R is a hydrogen atom or a methyl group
- Q is an alkoxy group or an aryloxy group having 110 carbon atoms.
- Part of Q may be a single bond.
- P is an alkylene group having 3 carbon atoms
- R is a hydrogen atom
- Q is a methoxy group
- m is an integer of 3 to 200, preferably 20 to 150, and more preferably 30 to 120.
- the number is small, the processability of an uncrosslinked rubber compound obtained by compounding silica with a conjugated gen-based rubber is lowered, or the balance between abrasion resistance and low heat generation is poor. If this number is large, the production of the corresponding polyorganosiloxane becomes difficult, and the viscosity of the polyorganosiloxane becomes too high, making it difficult to handle.
- n is an integer of 0 to 200, preferably an integer of 0 150, and more preferably an integer of 0 120. It is an integer of kf to 0 to 200, preferably an integer of f to 0 to 150, more preferably an integer of f to 0 to 120.
- the total number of m, n and k is preferably 400 or less, more preferably 300 or less, and particularly preferably 250 or less. If the total number is too large, the production of the polyorganosiloxane becomes difficult, and the viscosity of the polyorganosiloxane becomes too high, which makes handling difficult.
- R 9 to R 16 are an alkyl group having 16 to 16 carbon atoms or an aryl group having 6 to 12 carbon atoms. Yes, they may be the same or different.
- X 5 to X 8 are a part of which is a functional group which reacts with the active metal at the end of the chain of the active conjugated polymer, and the remaining part is a group or a single bond derived from the functional group.
- R 17 to R 19 are an alkyl group having 16 to 16 carbon atoms or an aryl group having 6 to 12 carbon atoms. Yes, they may be the same or different.
- X 9 —X 11 is a functional group partially reacting with the active metal at the chain end of the active conjugated polymer, and the remainder is a group or a single bond derived from the functional group.
- s is an integer of 118.
- the alkyl group having 16 to 16 carbon atoms, the aryl group having 6 to 12 carbon atoms, the functional group that reacts with the active metal at the terminal of the chain of the active conjugated polymer, and the group derived from the functional group are represented by the general formula: The same as described for the polyorganosiloxane after the reaction represented by (1).
- the branched conjugated polymer constituting the conjugated rubber (A) has a structure in which at least four or more conjugated polymer chains are bonded via a polyorganosiloxane. Is preferred.
- a conjugated gen-based rubber having a structure in which at least four or more conjugated gen-based polymer chains are bonded via a polyorganosiloxane accounts for 290% by weight, particularly 580% by weight of the conjugated-based rubber (A). preferable.
- a conjugated rubber containing a polymer having a structure in which at least four or more conjugated polymer chains are bonded via a polyorganosiloxane is used when producing a composition.
- a rubber with improved coagulability and drying properties, and also a non-crosslinked rubber composition with better processability when silica is blended, and a more improved balance of low heat build-up, wet grip properties and abrasion resistance gives a crosslinked product.
- the weight average molecular weight of the conjugated rubber (A) is from 1,000 to 3,000,000, preferably from 10,000 to 2,000,000, more preferably ⁇ 300,000 to 1,200,000. Is appropriately selected within the range. If the molecular weight is too high, the compounding of silica tends to be difficult, and the processability of the unbridged rubber composition containing silica tends to decrease. Conversely, if the molecular weight is too low, the low heat build-up tends to decrease and the cost tends to increase.
- the weight average molecular weight of the conjugated gen-based rubber (A) is usually from 100,000 to 3,000,000, preferably from 100,000 to 3,000,000. ⁇ Is 150,000—2,000,000, more preferred ⁇ is 200,000 in the range of 1,500,000. Also, it is possible to improve the kneading viscosity of the composition, the dispersibility of the filler, and the gripping property by including the conjugated diene rubber (A) as a liquid rubber together with other solid rubbers in the rubber composition. In that case, the weight average molecular weight of the conjugated rubber (A) is usually from 3,000,000 to 100,000, preferably from 10,000 to 80,000, more preferably from 30,000 to 70,000. Is selected in the range.
- the amount of the conjugated rubber ( ⁇ ) contained in the conjugated rubber composition of the present invention is It is 5 to 95% by weight, preferably 7 to 80% by weight, and more preferably 10 to 75% by weight of the total amount of the active rubber composition.
- the content of the conjugated diene rubber (A) is low, the uncrosslinked rubber composition obtained by blending silica with the conjugated diene rubber is inferior in processability, and other low heat generation properties of the obtained crosslinked rubber are not sufficient. Poor physical properties.
- Conjugated gen-based rubber (B) has a conjugated gen-based rubber having a structure in which two conjugated gen-based polymer chains are bonded via the above-described functional group, and the above-described functional group is bonded to the conjugated gen-based polymer chain end. At least one of the conjugated diene rubbers having the above-mentioned structure.
- ⁇ -substituted cyclic amides 3-substituted cyclic ureas, such as 1,3-dimethylethylene urea and 1,3-dimethyl-2, imidazolidinone; 4,4'-bis (dimethylamino) benzophenone, 4,4, -bis ⁇ ⁇ -substituted amino ketones such as (getylamino) benzophenone; and aromatic isocyanates such as diphenylmethane diisocyanate and 2,4-tolylene diisocyanate.
- ⁇ -substituted cyclic amides ⁇ -substituted cyclic ureas and ⁇ -substituted aminoketones are preferred.
- ⁇ -Bull_2_pyrrolidone ⁇ -Phenyl-2_pyrrolidone, ⁇ -Methylenol ⁇ -Caprolactam, 1,3-Jetyl-2-imidazolidinone, and 4,4'-bis (diethylamino) benzophenone Especially preferred ,.
- the compound having an amino group include N, N-disubstituted aminoalkyl methacrylamide compounds such as N, N-dimethylaminopropyl methacrylamide; and 4_N, N_dimethyl N-substituted aminoaldehydes such as luminaminobenzaldehyde.
- the compound having an imino group include N-substituted carbodiimides such as dicyclohexylcarbodiimide; and Schiff bases such as N-ethylethylideneimine and N-methylbenzylideneimine.
- the compound containing an epoxy group examples include propylene oxide, tetraglycidyl-1,3-bisaminomethylcyclohexane, epoxidized polybutadiene, and the like.
- a specific example of the compound having a pyridyl group there may be mentioned a Vully conjugate having a pyridyl group such as 4-butylpyridine.
- the compound containing an alkoxyl group include bis (triethoxysilylpropyl) tetrasulfide, bis (tributoxysilylpropyl) tetrasulfide, and ⁇ -glycidoxy.
- the compound containing a halogen examples include tin tetrachloride, silicon tetrachloride, triphenyl monochlorotin, triphenoxychlorosilane, methyltriphenoxysilane, and diphenoxydichlorosilane.
- the conjugated gen-based polymer chain constituting the conjugated gen-based rubber ( ⁇ ) is the same as the conjugated gen-based polymer chain constituting the conjugated gen-based rubber ( ⁇ ) described above. It is preferably a polymer chain or a copolymer chain of a conjugated gen monomer and an aromatic butyl monomer, preferably 50 to 100% by weight of a conjugated gen monomer unit and 50 to 100% by weight of an aromatic butyl monomer unit. More preferably, it comprises 0% by weight. Further, if desired, the conjugated gen-based polymer chain may contain other monomer units other than the conjugated gen monomer unit and the aromatic butyl monomer unit.
- the types and ratios of the conjugated diene monomer, aromatic butyl monomer and other monomers are different from those of the above-mentioned condensed diene polymer chain constituting the conjugated diene rubber ( ⁇ ). Can be selected as well.
- the weight average molecular weight of the conjugated rubber ( ⁇ ) is 1,000 to 3,000,000, preferably 10,000 to 2,000,000, similar to the aforementioned conjugated rubber ( ⁇ ). More preferably, it is appropriately selected in the range of 300,000—1,200,000. If the molecular weight is too high, the compounding of silica becomes difficult, or the processability of the uncrosslinked rubber composition containing silica tends to decrease. There is a direction. Conversely, if the molecular weight is too low, low heat build-up may be reduced or costs may be increased.
- the weight average molecular weight of the conjugated gen-based rubber ( ⁇ ) is generally up to 100,000—3,000,000, preferably up to 100%. 150,000,000 2,000,000, more preferred ⁇ is selected in the range of 200,000 1,500,000. Further, it is also possible to improve the kneading viscosity of the composition, the dispersibility of the filler, and the gripping property by including the conjugated diene rubber ( ⁇ ) as a liquid rubber together with other solid rubbers in the rubber composition. In this case, the weight-average molecular weight of the conjugated rubber ( ⁇ ) is usually selected from the range of from 3,000 to 100,000, preferably from 10,000 to 80,000, more preferably from 30,000 to 70,000. It is.
- the content of the conjugated diene rubber (beta) is conjugated diene-based rubber composition the total amount of 5 95 wt 0/0, preferably more preferably 7 80 wt 0 I 10 60% by weight.
- the content of the conjugated diene rubber ( ⁇ ⁇ ⁇ ) is low, the uncrosslinked rubber composition obtained by blending silica with the conjugated rubber has poor processability, and the obtained rubber crosslinked product does not have sufficient low heat build-up. Poor physical properties.
- the content of the conjugated diene rubber (II) is large, the resulting cross-linked product is inferior in low heat build-up and abrasion resistance.
- the conjugated rubber ( ⁇ ) is a polymer chain obtained by polymerizing a conjugated monomer or a conjugated monomer and an aromatic butyl monomer in an inert solvent using an organic active metal.
- the active conjugated polymer chain having an active metal at the terminal has a functional group capable of reacting with the active metal at the terminal of the active conjugated polymer chain. It is obtained by reacting at least one selected from the polyorganosiloxanes represented (polyorganosiloxanes before the reaction).
- the conjugated rubber ( ⁇ ) is a polymer chain obtained by polymerizing a conjugated gen monomer or a conjugated gen monomer and an aromatic vinyl monomer in an inert solvent using an organic active metal.
- the conjugated gen-based rubber composition of the present invention is prepared by mixing both the conjugated gen-based rubber (A) and the conjugated gen-based rubber (B) separately produced as described above. (The first method for producing a conjugated rubber composition).
- the conjugated rubber composition of the present invention containing the conjugated rubber (A) and the conjugated rubber (B) can be obtained (conjugated Second method for producing a rubber composition).
- the amounts of the conjugated gen monomer or the conjugated gen monomer and the aromatic butyl monomer used in the polymerization are adjusted so that the amount of each monomer unit of the finally obtained conjugated rubber becomes a desired value. What is necessary is just to set suitably.
- a solvent which is generally used in solution polymerization and which does not inhibit the polymerization reaction is not particularly limited. That Specific examples include aliphatic hydrocarbons such as butane, pentane, hexane, and 2-butene; alicyclic hydrocarbons such as cyclopentane, cyclohexane, and cyclohexene; and aromatics such as benzene, toluene, and xylene. Group hydrocarbons.
- the amount of the inert solvent used is such that the monomer concentration is usually 1 to 50% by weight, preferably 10 to 40% by weight.
- organic active metal examples include an organic alkali metal compound, an organic alkaline earth metal compound, and an organic transition metal compound.
- organic alkali metal compounds are preferably used. Specific examples thereof include organic monolithium compounds such as n-butyllithium, sec-butyllithium, t-butyllithium, hexyllithium, phenyllithium, and stilbenelithium; dilithiomethane, Organic polyvalent lithium compounds such as 4-dilithiobutane, 1,4-dilithium 2_ethylcyclohexane, 1,3,5_trilithiobenzene; organic sodium compounds such as sodium naphthalene; and organic potassium compounds such as potassium naphthalene No.
- organolithium compounds particularly organic monolithium compounds
- the organic alkali metal compound may be previously reacted with a secondary amine such as dibutylamine, dihexylamine, dibenzylinoamine, or pyrrolidine to be used as an organic alkali metal amide compound.
- a secondary amine such as dibutylamine, dihexylamine, dibenzylinoamine, or pyrrolidine
- organic active metals can be used alone or in combination of two or more.
- the amount of the organic active metal to be used is preferably in the range of 1 to 50 mmol, more preferably 2 to 20 mmol, per 1, 000 g of the monomer mixture.
- a polar compound in order to adjust the amount of vinyl bond in the conjugated diene monomer unit to a desired value.
- the polar compound include ether compounds such as dibutyl ether and tetrahydrofuran; tertiary amines such as tetramethylethylenediamine; alkali metal alkoxides; and phosphine compounds. Among them, ether compounds and tertiary amines are preferred, and tertiary amines are more preferred. Tetramethylethylenediamine is particularly preferred.
- the amount of the polar compound to be used is preferably in the range of 0.01 to 100 monoles, more preferably 0.330 mol, per 1 mol of the organic active metal.
- the polymerization temperature is usually in the range of -78 to 150 ° C, preferably 0 to 100 ° C, and more preferably 30 to 90 ° C.
- any mode such as a batch mode and a continuous mode can be adopted.
- the batch type is advantageous
- the vinyl bond amount is low to medium
- the continuous type is advantageous.
- the aromaticity in the polymerization system is increased in order to improve the randomness of the bond between the conjugated gen monomer unit and the aromatic vinyl monomer unit.
- the conjugated gen monomer or the conjugated gen monomer and the aromatic vinyl monomer are mixed so that the ratio of the aromatic vinyl monomer in the composition ratio of the vinyl monomer and the conjugated gen monomer is maintained in a specific range.
- the mixture is continuously or intermittently supplied to the polymerization reaction system for polymerization.
- conjugated gen-based rubber (A) In the production of the conjugated gen-based rubber (A), a functional group capable of reacting with the active metal at the terminal is added to the active conjugated polymer chain having an active metal at the terminal obtained as described above. Is reacted.
- the polyonoreganosiloxane used is a polyonoreganosiloxane represented by the general formula (1), (2) or (3) (wherein, in the general formula (1), X 1 and X 4 represent an active conjugated polymer. A functional group that reacts with the active metal at the chain end, or an alkyl group having 16 to 16 carbon atoms or an aryl group having 6 to 12 carbon atoms, and X 2 is the activity of the active conjugated diene polymer chain end.
- X 3 is a group containing a repeating unit of alkylene glycol of 2 to 20.
- the polyonoleganosiloxane represented by the general formula (2) is represented by X 5 — X 8 is a functional group that reacts with the active metal at the end of the chain of the active conjugated polymer
- X 9 X 11 is an active conjugated gen. It is a functional group that reacts with the active metal at the end of the chain of the system polymer. Is at least a kind are also selected from the group consisting of.
- the above polyonoreganosiloxane can be obtained, for example, by the methods described in The Chemical Society of Japan, 4th edition, Experimental Chemistry Course, Vol. 28, and references therein. Also, commercially available products can be obtained and used.
- the amount of polyorganosiloxane used is based on 1 mole of the organic active metal used for polymerization. More than 0.001 and less than 0.1, preferably more than 0.005 and less than 0.09, more preferably more than 0.01 and less than 0.08. Amount. If the amount is small or large, the effect of the present invention, in which a branched conjugated polymer is hardly produced, cannot be obtained.
- the polyorganosiloxane When the polyorganosiloxane is added to the polymerization system, it dissolves in the inert solvent used in the polymerization, and the active metal at the chain end of the active conjugated polymer becomes easily reacted with the polyorganosiloxane uniformly.
- the concentration of the solution is preferably 1 to 50% by weight.
- the time when the polyorganosiloxane is reacted with the active conjugated polymer chain is preferably at the time when the polymerization reaction is almost completed.After the polymerization reaction is almost completed, the active conjugated polymer chain gels by a side reaction. It is more preferable before the reaction or before undergoing a chain transfer reaction due to impurities in the polymerization system.
- a polymerization terminator Prior to the reaction of the active conjugated polymer chain with the polyorganosiloxane, a polymerization terminator, a polymerization terminal modifier, a coupling agent and the like which are generally used in anion polymerization are used as long as the effects of the present invention are not impaired. It may be added to the polymerization system to inactivate a part of the active metal at the chain end of the active conjugated diene polymer.
- Conditions for reacting the polyorganosiloxane with the active conjugated diene polymer chain are as follows: the reaction temperature is usually in the range of 0 to 100 ° C, preferably 30 to 90 ° C, and the reaction time is usually , 120 minutes, preferably 2 to 60 minutes.
- an alcohol such as methanol or isopropanol or water is added as a polymerization terminator to terminate the reaction to obtain a polymerization solution.
- the anionic conjugated polymer chain may be optionally added before the addition of the polymerization terminator.
- a polymerization end modifier, a coupling agent, and the like, which are usually used in polymerization, may be added to the polymerization system and reacted.
- These functional group-containing compounds can be used alone or in combination of two or more.
- An active metal is obtained at the polymer chain end obtained by polymerizing a conjugated gen monomer or a conjugated gen monomer and an aromatic vinyl monomer with an organic active metal in an inert solvent.
- the compound having the above functional group capable of reacting with the above-mentioned polyonoreganosiloxane and the active metal at the end of the chain of the active conjugated diene polymer is successively reacted with the active conjugated diene polymer chain to form the conjugate of the present invention.
- the compound having the functional group described above is reacted to form a conjugated gen-based rubber (B), and then, the polyorganosiloxane is reacted with the remaining active conjugated-based polymer chain to form a conjugated gen-based rubber (B).
- the rubber (A) it is preferable to produce the rubber (A). Conversely to the order of the steps, when the polyorganosiloxane is first reacted to form the conjugated gen-based rubber (A), and then the compound having the above functional group is reacted, the desired amount of conjugated rubber is obtained. It is difficult to generate the gen-based rubber (B), and it is difficult to obtain a rubber crosslinked product having low heat build-up and excellent abrasion resistance.
- a modification rate ie, a polymer in which the above-mentioned functional group is introduced into a conjugated gen-based polymer molecule having an active terminal
- the higher the degree of modification due to the terminal modification the more improved the grip properties and low heat buildup.
- the denaturation rate is determined by calculating the ratio of the absorption intensity (UV) measured by an ultraviolet-visible spectrophotometer (UV / RI) to the differential refractive index (RI) measured by a GPC differential refractometer, and using a calibration curve created in advance. can do.
- the coupling rate is The peak area after the coupling reaction at the same position as the peak before the coupling reaction and the peak after the coupling reaction with a higher molecular weight than the peak before the coupling reaction Can be determined from the ratio to the area of
- the polymerization solvent is separated from the polymerization solution by direct drying or steam stripping, and the target rubber is recovered.
- the polymerization solution can be mixed with an extender oil and recovered as an oil-extended rubber.
- the extender oil a process oil described below or the like can be used, and the amount of the extender oil is usually based on 100 parts by weight of the total amount of the synergistic rubber (A) and / or the conjugated rubber (B). It is 5-100 parts by weight, preferably 1060 parts by weight, more preferably 2050 parts by weight.
- the conjugated diene rubber composition of the present invention contains 5-95% by weight of a conjugated diene rubber (A) and 95-5% by weight of a conjugated diene rubber (B).
- the ratio (A) / (B) (weight ratio) between the conjugated rubber (A) and the conjugated rubber (B) is usually 5 / 95-95 / 5, preferably 7 / 93-93 /. 7, more preferably in the range of 10 / 90-85 / 15. Outside this range, it becomes difficult to obtain the desired crosslinked product having excellent low heat build-up, wet grip, abrasion resistance and tensile strength. In particular, the effect of improving low heat buildup when silica and carbon black are used in combination is poor.
- conjugated gen-based rubber (A) and the conjugated gen-based rubber (B) two conjugated gen-based rubbers are generally used in addition to the conjugated gen-based rubber (A) and the conjugated gen-based rubber (B).
- conjugated gen-based polymer chains Polyanoreganosiloxane-modified conjugated gen-based polymers in which one polyorganosiloxane is bonded at the end, and polyorganosiloxane bonded
- Unmodified conjugated polymers modified conjugated gen-based polymers modified with polymerization terminal modifiers commonly used in anion polymerization, and coupling agents commonly used in anion polymerization.
- the conjugated rubber composition of the present invention may contain these conjugated polymers.
- the conjugated rubber composition of the present invention has a polymer having a glass transition temperature of -120 ° C to 200 ° C and a weight average molecular weight of 1,000,000 3,000,000. The ability to mix
- the polymer to be blended is a resinous or rubbery polymer having a weight average molecular weight within the above range, preferably 300,000 to 2,000,000, more preferably ⁇ 100,000 to 1,200,000. And preferably a rubbery polymer.
- the rubbery polymer may be a conjugated diene polymer, in which case the glass transition temperature is usually -110 ° C 100 ° C, preferably -110 ° C-10 ° C, more preferably The temperature is 110 ° C 25 ° C. If the glass transition temperature is too high, the low heat buildup and abrasion resistance of the rubber crosslinked product may not be sufficient
- the rubbery polymer to be blended include natural rubber, polyisoprene rubber, emulsion-polymerized styrene-butadiene copolymer rubber, solution-polymerized styrene-butadiene copolymer rubber (for example, when the amount of bound styrene is 5 to 50% by weight).
- the blending amount of these polymers is usually 900 parts by weight or less, preferably 700 parts by weight or less, more preferably 100 parts by weight or less with respect to 100 parts by weight of the total of the conjugated rubber (A) and the conjugated rubber (B). Is less than 500 parts by weight. If the amount of the polymer is too large, it becomes difficult to obtain a crosslinked product having excellent processability of the uncrosslinked composition, low heat build-up of the rubber crosslinked product, wet grip properties and abrasion resistance.
- the rubber composition of the present invention preferably contains at least one filler selected from silica and carbon black.
- the filler preferably contains silica or both silica and carbon black.
- silica examples include dry method white carbon, wet method white carbon, and colloidal silica.
- a wet-process white carbon mainly containing hydrous caustic acid is preferred.
- a carbon silica dual 'phase' filter having silica supported on the carbon black surface may be used.
- These silicas can be used alone or in combination of two or more.
- the nitrogen adsorption specific surface area of the silica is preferably from 50 to 400 m 2 / g, more preferably from 100 to 220 m 2 / g. Within this range, more excellent wear resistance and low heat build-up will be obtained.
- silica When silica is blended, low heat buildup and abrasion resistance can be further improved by further blending a silane coupling agent.
- silane coupling agent examples include biertriethoxysilane, ⁇ - (3,4-epoxycyclohexyl) ethyltrimethoxysilane, N— (j3-aminoethyl) - ⁇ -aminopropyltrimethoxysilane, Octathio- 1-propyltriethoxysilane, bis (3- (triethoxide, ⁇ -trimethoxysilinolepropyldimethylthio-capillyl valaminoletetrasulfide, ⁇ -trimethoxysilylpropylbenzothiazyltetrasulfide, etc.
- sulfides containing no more than 4 sulfur atoms in one molecule are preferable because scorch during kneading can be prevented.
- two or more kinds can be used in combination.
- the amount of the silane coupling agent is preferably 0.1 to 30 parts by weight, more preferably 1 to 15 parts by weight, based on 100 parts by weight of silica.
- Examples of carbon black include furnace black, acetylene black, and thermal black. , Channel black, graphite, graphite fibers, fullerene and the like. Of these, specific examples of furnace black preferred are SAF, ISAF, ISAF-HS, ISAF_LS, IISAF_HS, HAF, HAF_HS, HAF-LS, and FEF. These carbon blacks can be used alone or in combination of two or more.
- the nitrogen adsorption specific surface area (NSA) of the carbon black is preferably from 5 to 200 m 2 / g,
- DBP dibutyl phthalate
- the adsorption specific surface area of cetyl trimethylammonium bromide (CTAB) disclosed in JP-A-5-230290 is 110-170 m 2 / g, and compression is repeated four times at a pressure of 165 MPa.
- CTAB cetyl trimethylammonium bromide
- the use of a high-structure carbon black having a DBP (24M4DBP) oil absorption of 110-130 ml / 100 g after the addition of is further improved in abrasion resistance S.
- the compounding amount of the filler is preferably 5 to 150 parts by weight, more preferably 20 to 120 parts by weight, and particularly preferably 40 to 100 parts by weight based on 100 parts by weight of the whole rubber. If the amount of the filler is too small, the crosslinked rubber, which has an insufficient effect of improving the reinforcing properties, has insufficient abrasion resistance. Conversely, if the amount is too large, the processability of the uncrosslinked rubber composition and the low heat buildup of the crosslinked rubber composition are not sufficient.
- the filler may be filled into the solid rubber by a dry kneading method, or may be a wet kneading method, that is, the respective fillers may be blended into a polymer solution and then coagulated and dried.
- a rubber composition filled with 0 to 150 parts by weight of silica per 100 parts by weight of a conjugated diene rubber (A) and 0 to 150 parts by weight of carbon black per 100 parts by weight of a conjugated diene rubber (B) are used.
- the rubber composition is mixed with a partially filled rubber composition.
- the rubber composition of the present invention may further comprise a crosslinking agent, a crosslinking accelerator, a crosslinking activator, an antioxidant, an activator, a process oil, a plasticizer, a lubricant, Compounding agents such as fillers can be compounded in required amounts.
- Crosslinking agents include powdered sulfur, precipitated sulfur, colloidal sulfur, insoluble sulfur, and highly dispersible sulfur. Which sulfur; halogenated sulfur such as monochloride and sulfur; organic peroxides such as dicumyl peroxide and di-tert-butyl peroxide; p_quinone dioxime; p, p'-di Quinonedioximes such as benzoylquinonedioxime; organic polyvalent amine conjugates such as triethylenetetramine, hexanemethylenediamine rubbamate, and 4,4′-methylenebis-o-chloroaniline; alkylphenyls having a methylol group And powdered sulfur, of which sulfur is preferred. These cross-linking agents are used alone or in combination of two or more.
- the compounding amount of the crosslinking agent is preferably 0.1 to 15 parts by weight, more preferably 0.5 to 5 parts by weight, based on 100 parts by weight of the whole rubber.
- crosslinking accelerator examples include N-cyclohexyl 2_benzothiazylsulfenamide, N_t-butynole_2_benzothiazolesulfenamide, N-oxyethylene_2_benzothiazolesulfenamide, N-oxyethylene_2_benzothiazolesulfenamide, N, N'-diisopropinolee2_benzothiazolesulfenamide, etc., sulfenamide-based cross-linking promoting IJ; diphenyldananidin, dioltotriluguanidine, orthotrirubiguanidine, etc.
- Guanidine-based cross-linking accelerators Guanidine-based cross-linking accelerators; thiourea-based cross-linking accelerators such as getylthioperia; thiazole-based cross-linking accelerators such as 2-mercaptobenzothiazole, dibenzothiazyl disulphide, and 2-mercaptobenzothiazole zinc salt; Ulam monosulfide, tetramethi Thiuram-based crosslinking accelerators such as rutiuram disulphide; dithi-talented rubamic acid-based crosslinking accelerators such as sodium dimethyldithiocarbamate and zinc getyldithiocarbamate; sodium isopropylxanthate, zinc isopropylxanthate, A xanthic acid-based cross-linking accelerator such as zinc butyl xanthogenate; Among them, those containing a sulfenamide-based crosslinking accelerator are particularly preferred. These crosslinking accelerators may be used
- the compounding amount of the crosslinking accelerator is preferably 0.1 to 15 parts by weight, more preferably 0.55 parts by weight, based on 100 parts by weight of the whole rubber.
- crosslinking activator for example, higher fatty acids such as stearic acid, zinc oxide and the like can be used.
- Zinc oxide with high surface activity and particle size of 5 xm or less is preferred
- activated zinc white having a particle size of 0.05-0.2 / im or zinc white having a particle size of 0.3-1 ⁇ m is used.
- zinc oxide a zinc oxide surface-treated with an amine dispersant or a wetting agent can be used.
- the amount of the cross-linking activator is appropriately selected, but the higher fatty acid is preferably 0.0515 parts by weight, more preferably 0.5-5 parts by weight, based on 100 parts by weight of the total rubber.
- the amount of zinc oxide is preferably 0.0510 parts by weight, more preferably 0.5-3 parts by weight.
- the process oil those commonly used in the rubber industry can be used, and examples thereof include paraffinic, aromatic, and naphthenic petroleum softeners, vegetable softeners, and fatty acids.
- petroleum-based softeners those having a polycyclic aromatic content of less than 3% are preferred. This content is measured by the method of IP346 (test method of THE INSTITUTE PETROLEUM in the UK).
- Other compounding agents include activators such as diethylene glycol, polyethylene render glycol, and silicone oil; fillers such as calcium carbonate, tanolek, clay, aluminum hydroxide, and corn starch; tackifiers such as petroleum resins and coumarone resins; waxes Is mentioned.
- the conjugated diene rubber composition of the present invention can be obtained by kneading each component according to a conventional method.
- a rubber composition can be obtained by kneading a compounding agent excluding a crosslinking agent and a crosslinking accelerator and rubber, and then mixing the kneaded product with a crosslinking agent and a crosslinking accelerator.
- the kneading temperature of the compounding agent and the rubber excluding the crosslinking agent and the crosslinking accelerator is preferably 80 to 200 ° C, more preferably 120 to 180 ° C, and the kneading time is preferably 30 seconds to 30 minutes. is there.
- the mixing of the crosslinking agent and the crosslinking accelerator is usually performed after cooling to 100 ° C or less, preferably 80 ° C or less.
- the conjugated diene rubber composition of the present invention is usually used after being crosslinked.
- the crosslinking method is not particularly limited, and may be appropriately selected depending on the shape, size, and the like of the crosslinked product.
- a rubber composition containing a crosslinking agent which can be crosslinked at the same time as molding by filling a rubber composition containing a crosslinking agent into a mold and heating, is preliminarily molded, and then heated to be crosslinked.
- the crosslinking temperature is preferably between 120 and 200. C, more preferably 140 to 180 ° C, and the crosslinking time is usually about 1 to 120 minutes.
- the cross-linked rubber obtained by cross-linking the conjugated rubber composition of the present invention has low heat build-up, Because of its excellent grip and abrasion resistance, it can be used for various applications that take advantage of its properties, such as tires, carcass, sidewalls, inner liners, bead sections, etc .; or hoses, window frames, belts, It can be used for rubber products such as shoe soles, anti-vibration rubber, and automotive parts; it can also be used as resin-reinforced rubber such as impact-resistant polystyrene and ABS resin. It is particularly suitable as a tread material for fuel-efficient tires.
- the content of the branched conjugated polymer is determined by mixing the conjugated polymer before the reaction with the polyorganosiloxane and the conjugated rubber finally obtained under the following conditions: It was measured by gel permeation chromatography.
- the molecular weight that is 3 times or 4 times or more of the molecular weight peak of the conjugated gen-based polymer before the reaction with the polyorganosiloxane with respect to the total amount of the conjugated gen-based rubber finally obtained is obtained.
- the weight fraction of the polymer molecules having the polymer was determined, and the results are shown as the amount of a polymer having three branches and the amount of a polymer having four or more branches, respectively.
- the total amount of the amount of the polymer having three branches and the amount of the polymer having four or more branches is indicated as the amount of the polymer having three or more branches.
- the weight average molecular weight of the (3-1) conjugated diene polymer was measured by gel 'permeation' chromatography under the same conditions as described above.
- the rubber composition covers the roll surface. : 4 points
- tan ⁇ at 60 ° C. was measured using RDA-II manufactured by Rheometrics Inc. under the conditions of 4.0% twist and 1 Hz. This property is indicated by an index. The smaller the index, the better the low heat buildup.
- the wet grip property was measured by using RDA-II manufactured by Rheometrics Co., Ltd., tan ⁇ at 0 ° C. under the conditions of 0.5% twist and 20 Hz. This characteristic is indicated by an index. The larger the index, the better the wet grip.
- Abrasion resistance was measured using a Lambourn abrasion tester according to JIS No. 6264. This property was expressed as an index (wear resistance index). The larger the value, the better the wear resistance.
- n-butyllithium is removed from impurities not involved in polymerization. 8.7 millimoles as a total amount of the sum and the amount of the polymerization reaction were added, and polymerization was started at 50 ° C. Ten minutes after the initiation of the polymerization, a mixture of 40 g of styrene and 360 g of 1,3-butadiene was continuously added over 60 minutes. The highest temperature during the polymerization reaction was 65 ° C.
- the polymerization reaction was continued for another 20 minutes, 312 g of 1,3-butadiene was added, the polymerization reaction was continued for 10 minutes, and it was confirmed that the polymerization conversion reached 100%.
- the polymerization solution was sampled. A small amount of the sampled polymerization solution was added with an excess of methanol to stop the reaction, and then air-dried to obtain a polymer, which was used as a sample for gel permeation / chromatographic analysis.
- the uncrosslinked rubber composition I was press-crosslinked at 160 ° C. for 30 minutes to prepare a test piece, and the low heat build-up, wet grip properties, wear resistance and tensile strength were measured. The results are shown in Table 2 as an index with Comparative Example 1 being 100.
- a conjugated gen-based rubber composition was prepared in the same manner as in Example 1 except that tin tetrachloride (0.3 mm) was used instead of 4,4-bis (getylamino) benzophenone (EAB). Table 1 shows the analysis results of this conjugated rubber composition. Further, a compounding agent was added to the conjugated gen-based rubber composition ii by the same method as in Example 1 to prepare a conjugated gen-based rubber composition II. Were evaluated. Table 2 shows the evaluation results.
- a solid conjugated rubber m was produced in the same manner as in Example 1, except that the addition ratio of polyorganosiloxane A to n-butyllithium was 0.5 mol. Table 1 shows the analysis results of this conjugated rubber composition m.
- a solid conjugated rubber composition V was prepared in the same manner as in Example 1, except that methanol was used instead of EAB. Table 1 shows the analysis results of the conjugated rubber composition V.
- the rubber component in the rubber composition I is the rubber composition i
- the rubber component in the rubber composition II is a rubber composition ii.
- the rubber component in the rubber composition ill is a rubber composition m
- the rubber component in the rubber composition IV is a rubber composition iv
- the rubber component in the rubber composition V is a rubber composition V
- n-butyllithium is removed from impurities not involved in polymerization. 8.3 millimoles were added as a total amount of the sum and the polymerization reaction, and polymerization was started at 40 ° C. Ten minutes after the initiation of the polymerization, a mixture of 40 g of styrene and 360 g of 1,3-butadiene was continuously added over 60 minutes. The highest temperature during the polymerization reaction was 60 ° C.
- n-butyllithium is removed from impurities not involved in polymerization. 9.3 millimoles of the sum total and the amount of the polymerization reaction were added, and polymerization was started at 45 ° C. Ten minutes after the start of the polymerization, a mixture of 40 g of styrene and 360 g of 1,3-butadiene was continuously added over 50 minutes. The highest temperature during the polymerization reaction was 75 ° C.
- the polymerization solution containing the conjugated diene rubber vi-1 and the polymerization solution containing the conjugated diene rubber vi-2 were mixed such that the conjugated diene rubbers vi-1 and vi-2 were respectively 2: 1. After mixing and stirring for 30 minutes, a polymerization solution vi was obtained.
- Example 2 The same operation as in Example 1 was performed from the polymerization solution vi to obtain a solid conjugated diene rubber composition vi.
- a conjugated diene rubber composition vi 85 parts of a conjugated diene rubber composition vi and 15 parts of a high cis-polybutadiene rubber (Nipol BR1220N, manufactured by Zeon Corporation) are masticated for 30 seconds, and then silica ( (Nipsil AQ, manufactured by Nippon Silica Kogyo Co., Ltd.) 45 parts and 4.5 parts of a silane coupling agent (Si69) were added, and kneaded at 110 ° C for 1.5 minutes.
- silica (Nipsil AQ, manufactured by Nippon Silica Kogyo Co., Ltd.) 45 parts and 4.5 parts of a silane coupling agent (Si69) were added, and kneaded at 110 ° C for 1.5 minutes.
- a conjugated diene rubber vi-3 was obtained in the same manner as in the production example of the conjugated diene rubber vi-1 of Example 3, except that the addition ratio of the polyorganosiloxane B was changed to 0.5 mol. Also, N
- a conjugated diene rubber vi-4 was obtained in the same manner as in the production example of the conjugated diene rubber vi-2 in Example 3, except that MP was replaced with methanol. Table 3 shows the results of analysis of the conjugated rubbers vi-3 and vi-4.
- the solid conjugated rubber composition vii was obtained from the conjugated rubbers vi-3 and vi-4 via the polymerization solution vii. Got.
- the rubber component in the rubber composition VI is the rubber composition vi (conjugated diene rubber vi_l + conjugated diene rubber vi_2) + high cis' polybutadiene rubber
- the rubber component in the rubber composition VII is a rubber composition vii (conjugated diene rubber vi-3 + conjugated diene rubber vi-4) + high cis' polybutadiene rubber
- n-butyllithium was removed from impurities not involved in polymerization. 8.6 millimoles as a total amount of the sum and the polymerization reaction were added, and polymerization was started at 50 ° C. Ten minutes after the start of the polymerization, a mixture of 50 g of styrene and 450 g of 1,3-butadiene was continuously added over 60 minutes. The highest temperature during the polymerization reaction was 70 ° C.
- Example 2 The same operation as in Example 1 was performed from the obtained polymerization solution to obtain a solid conjugated rubber viii-1.
- Table 5 shows the results of the analysis.
- n-butyllithium is removed from impurities not involved in polymerization. 8.6 millimoles as a total amount of the sum and the polymerization reaction were added, and polymerization was started at 40 ° C. Ten minutes after the initiation of the polymerization, a mixture of 40 g of styrene and 360 g of 1,3-butadiene was continuously added over 60 minutes. The highest temperature during the polymerization reaction was 60 ° C.
- Example 2 The same operation as in Example 1 was performed from the obtained polymerization solution to obtain a solid conjugated rubber viii-2.
- Table 5 shows the results of the analysis.
- Abrasion resistance (number of measures) 1 11 100
- the rubber component in the rubber composition VIII is a conjugated diene rubber viii-1
- the rubber component in the rubber composition IX is a conjugated diene rubber viii-2
- n-butyllithium is not involved in the polymerization. 5.7 mmol as a total amount of the neutralized impurities and the polymerization reaction were added, and polymerization was started at 45 ° C. Twenty minutes after the start of the polymerization, a mixture of 80 g of styrene and 320 g of 1,3-butadiene was added for 60 minutes to continuously add calories. The maximum temperature during the polymerization reaction was 65 ° C.
- Example 7 shows the results.
- the procedure was the same as in the production of the conjugated rubber x-1, except that tetramethoxysilane was used instead of the polyorganosiloxane and the addition ratio was 0.3 times the mole. -4.
- the solid conjugated rubber x-4 was obtained in the same manner as the solid conjugated rubber x-1.
- Polymers with 3 or more branches (Polymer (A)) shu (%) 37 28-25
- the rubber component in the rubber composition X is conjugated rubber x-1 + conjugated rubber x-3 + SBR
- the rubber component in the rubber composition XII is composed of a conjugated rubber composition XI (a conjugated rubber) x-1 + conjugated rubber x-2) + conjugated rubber x-3 + SBR
- the rubber component in the rubber composition xm is composed of a conjugated diene rubber x-4 + a cis'polybutadiene rubber + SBR
- Comparative Example 1 Conjugated rubber set obtained by adding a large amount of polyorganosiloxane A The product III is inferior in the processability of an uncrosslinked rubber composition in which the amount of a polymer having three or more branches is extremely small, and the crosslinked rubber has low heat build-up, wet grip properties, abrasion resistance and tensile strength. Comparative Example 2: When the functional group-containing compound (EAB) was not reacted and tetramethoxysilane was reacted in place of the polyorganosiloxane, the uncrosslinked rubber composition contained a considerable amount of a polymer having three or more branches. The processability of the product and the low heat build-up, wet gripping properties and abrasion resistance of the crosslinked rubber are extremely poor.
- EAB functional group-containing compound
- Comparative Example 3 When methanol was used in place of the functional group-containing compound (EAB), a large amount of a polymer having three or more branches was formed, but the processability of the uncrosslinked rubber composition was good. Inferior in heat generation, wet grip, abrasion resistance and tensile strength of rubber.
- EAB functional group-containing compound
- the conjugated rubber compositions of Examples 1 and 2 which were produced within the range specified in the present invention and contained a large amount of a polymer having three or more branches were the uncrosslinked rubber compositions It has excellent workability, and the crosslinked rubber has excellent low heat build-up, wet grip properties and abrasion resistance.
- the conjugated diene rubber composition of the present invention exhibits excellent processability when silica is compounded, and the crosslinked rubber is excellent in low heat build-up, wet grip properties and abrasion resistance. Therefore, the rubber cross-linked product can be used for various applications that take advantage of its properties, such as treads, carcass, sidewalls, inner liners, bead portions, and other tire components, or hoses, window frames, belts, shoe soles, and tires. It can be used for rubber products such as vibration rubber and automotive parts, and as resin-reinforced rubber such as impact-resistant polystyrene and ABS resin. It is particularly suitable as a tread material for fuel-efficient tires.
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
- Other Resins Obtained By Reactions Not Involving Carbon-To-Carbon Unsaturated Bonds (AREA)
- Silicon Polymers (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2004800327516A CN1878830B (zh) | 2003-09-01 | 2004-09-01 | 共轭二烯类橡胶组合物、其制造方法及橡胶交联物 |
JP2005513524A JP4670639B2 (ja) | 2003-09-01 | 2004-09-01 | 共役ジエン系ゴム組成物、その製造方法およびゴム架橋物 |
US10/570,025 US7700693B2 (en) | 2003-09-01 | 2004-09-01 | Conjugated diene rubber compostion, process for producing the same and rubber vulcanizate |
KR1020067004210A KR101113618B1 (ko) | 2003-09-01 | 2004-09-01 | 공액 디엔계 고무 조성물, 그 제조방법 및 고무 가교물 |
EP04772616A EP1661946B1 (en) | 2003-09-01 | 2004-09-01 | Conjugated diene rubber compositions, process for production of the same and products of crosslinking thereof |
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JP2003308391 | 2003-09-01 | ||
JP2003-308391 | 2003-09-01 |
Publications (1)
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WO2005021637A1 true WO2005021637A1 (ja) | 2005-03-10 |
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PCT/JP2004/012660 WO2005021637A1 (ja) | 2003-09-01 | 2004-09-01 | 共役ジエン系ゴム組成物、その製造方法およびゴム架橋物 |
Country Status (6)
Country | Link |
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US (1) | US7700693B2 (ja) |
EP (1) | EP1661946B1 (ja) |
JP (1) | JP4670639B2 (ja) |
KR (1) | KR101113618B1 (ja) |
CN (1) | CN1878830B (ja) |
WO (1) | WO2005021637A1 (ja) |
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JP2010126656A (ja) * | 2008-11-28 | 2010-06-10 | Nippon Zeon Co Ltd | ランフラットタイヤ用ゴム組成物、及びランフラットタイヤ用架橋成形体 |
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Cited By (23)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2007270020A (ja) * | 2006-03-31 | 2007-10-18 | Nippon Zeon Co Ltd | シロキサン構造含有重合体、変性基体重合体組成物、基材重合体組成物、補強性重合体組成物及び加硫性ゴム組成物 |
JP2009084413A (ja) * | 2007-09-28 | 2009-04-23 | Nippon Zeon Co Ltd | ポリブタジエンゴム、タイヤ用ゴム組成物、およびタイヤ |
JP2009179754A (ja) * | 2008-01-31 | 2009-08-13 | Nippon Zeon Co Ltd | ベーストレッド用ゴム組成物 |
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JP2010126656A (ja) * | 2008-11-28 | 2010-06-10 | Nippon Zeon Co Ltd | ランフラットタイヤ用ゴム組成物、及びランフラットタイヤ用架橋成形体 |
KR20120138752A (ko) * | 2010-02-26 | 2012-12-26 | 제온 코포레이션 | 공액 디엔계 고무, 고무 조성물, 고무 가교물, 및 타이어, 그리고 공액 디엔계 고무의 제조 방법 |
JPWO2011105362A1 (ja) * | 2010-02-26 | 2013-06-20 | 日本ゼオン株式会社 | 共役ジエン系ゴム、ゴム組成物、ゴム架橋物、およびタイヤ、ならびに共役ジエン系ゴムの製造方法 |
JP5716736B2 (ja) * | 2010-02-26 | 2015-05-13 | 日本ゼオン株式会社 | 共役ジエン系ゴム、ゴム組成物、ゴム架橋物、およびタイヤ、ならびに共役ジエン系ゴムの製造方法 |
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JP5240409B2 (ja) * | 2010-12-03 | 2013-07-17 | 横浜ゴム株式会社 | タイヤトレッド用ゴム組成物 |
DE112011103992B9 (de) | 2010-12-03 | 2018-04-12 | The Yokohama Rubber Co., Ltd. | Kautschukzusammensetzung zur Verwendung in Reifenlaufflächen, vulkanisiertes Produkt davon und dessen Verwendung in einer Reifenlauffläche eines Luftreifens |
DE112011104012T5 (de) | 2010-12-03 | 2013-08-29 | The Yokohama Rubber Co., Ltd. | Kautschukzusammensetzung zur Verwendung in Reifenlaufflächen |
DE112011103992T5 (de) | 2010-12-03 | 2013-08-29 | The Yokohama Rubber Co., Ltd. | Kautschukzusammensetzung zur Verwendung in Reifenlaufflächen |
JPWO2012073838A1 (ja) * | 2010-12-03 | 2014-05-19 | 横浜ゴム株式会社 | タイヤトレッド用ゴム組成物 |
JP5240410B2 (ja) * | 2010-12-03 | 2013-07-17 | 横浜ゴム株式会社 | タイヤトレッド用ゴム組成物 |
DE112011104012B9 (de) | 2010-12-03 | 2017-08-03 | The Yokohama Rubber Co., Ltd. | Kautschukzusammensetzung zur Verwendung in Reifenlaufflächen, vulkanisiertes Produkt davon und dessen Verwendung in einer Reifenlauffläche eines Luftreifens |
JP2013166864A (ja) * | 2012-02-15 | 2013-08-29 | Yokohama Rubber Co Ltd:The | タイヤトレッド用ゴム組成物 |
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JP2016037601A (ja) * | 2014-08-07 | 2016-03-22 | 横浜ゴム株式会社 | ゴム組成物およびそれを用いた空気入りタイヤ |
JP2020007532A (ja) * | 2018-06-28 | 2020-01-16 | 旭化成株式会社 | 変性共役ジエン系重合体混合物の製造方法 |
JP7280115B2 (ja) | 2018-06-28 | 2023-05-23 | 旭化成株式会社 | 変性共役ジエン系重合体混合物の製造方法 |
Also Published As
Publication number | Publication date |
---|---|
CN1878830A (zh) | 2006-12-13 |
KR20060133951A (ko) | 2006-12-27 |
US20080275184A1 (en) | 2008-11-06 |
KR101113618B1 (ko) | 2012-02-17 |
US7700693B2 (en) | 2010-04-20 |
CN1878830B (zh) | 2012-07-04 |
EP1661946A1 (en) | 2006-05-31 |
JPWO2005021637A1 (ja) | 2007-11-01 |
EP1661946B1 (en) | 2012-12-26 |
JP4670639B2 (ja) | 2011-04-13 |
EP1661946A4 (en) | 2009-07-22 |
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