WO2015008736A1 - 重合体の製造方法 - Google Patents
重合体の製造方法 Download PDFInfo
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- WO2015008736A1 WO2015008736A1 PCT/JP2014/068745 JP2014068745W WO2015008736A1 WO 2015008736 A1 WO2015008736 A1 WO 2015008736A1 JP 2014068745 W JP2014068745 W JP 2014068745W WO 2015008736 A1 WO2015008736 A1 WO 2015008736A1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F4/00—Polymerisation catalysts
- C08F4/42—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors
- C08F4/44—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides
- C08F4/46—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides selected from alkali metals
- C08F4/48—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides selected from alkali metals selected from lithium, rubidium, caesium or francium
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/04—Polymerisation in solution
- C08F2/06—Organic solvent
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F212/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring
- C08F212/02—Monomers containing only one unsaturated aliphatic radical
- C08F212/04—Monomers containing only one unsaturated aliphatic radical containing one ring
- C08F212/06—Hydrocarbons
- C08F212/08—Styrene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F236/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds
- C08F236/02—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds
- C08F236/04—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds conjugated
- C08F236/10—Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds conjugated with vinyl-aromatic monomers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F36/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds
- C08F36/02—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds
- C08F36/04—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds conjugated
Definitions
- the present invention relates to a method for producing a polymer.
- the object of the present invention is to prevent the gel from being mixed into the product by suppressing the formation of the gel around the feed port of the organolithium compound which is a polymerization initiator.
- the present inventors have determined that the linear velocity at the feed opening is 0.1 to 0.1 when the organolithium compound as an initiator is fed into the polymerization tank. By making the range of 5 m / sec, it was found that gel formation around the feed port was remarkably suppressed, and gel mixing into the product was sufficiently suppressed, and the present invention was achieved.
- the present invention is as follows. [1] A step (1) of continuously feeding a monomer containing a conjugated diene compound and / or an aromatic vinyl compound to a polymerization tank; A step (2) of continuously feeding a solution containing an organolithium compound to a polymerization tank; Including In the step (2), a method for producing a polymer, wherein the linear velocity at the opening of the feed port of the solution containing the organolithium compound is 0.1 to 5 m / sec. [2] The method for producing a polymer according to [1], wherein the monomer contains at least a conjugated diene compound. [3] The method for producing a polymer according to [1] or [2], wherein the concentration of the organolithium compound in the solution containing the organolithium compound fed to the polymerization tank is 0.01 to 1% by mass.
- the method of the present invention it is possible to suppress the formation of gel around the feed port of the organolithium compound in the polymerization tank and to prevent the gel from being mixed into the product.
- the present embodiment a mode for carrying out the present invention (hereinafter referred to as “the present embodiment”) will be described in detail.
- the polymer production method of the present embodiment includes a step (1) of continuously feeding a monomer containing a conjugated diene compound and / or an aromatic vinyl compound to a polymerization tank, and a solution containing an organolithium compound in the polymerization tank. (2), wherein the linear velocity at the opening of the feed port of the solution containing the organolithium compound is 0.1 to 5 m / sec.
- the monomer in the step (1) is a monomer containing a conjugated diene compound because the effects of the present invention are remarkably exhibited.
- a polymer of a conjugated diene compound and / or an aromatic vinyl compound can be obtained by polymerizing these monomers using a polymerization initiator (organolithium compound).
- the obtained polymer is preferably a polymer of a conjugated diene compound and / or an aromatic vinyl compound, and is preferably a polymer of a conjugated diene compound.
- the polymerization process used in the present embodiment may be any of batch type, semi-batch type, and continuous type, but the continuous type is preferable because the effects of the present invention are remarkably exhibited.
- the continuous polymerization is not particularly limited.
- the polymerization reaction is continued by continuously feeding raw materials such as an initiator, a monomer, and a solvent to the polymerization tank at a predetermined feed rate. And a polymerization process in which a polymerization reaction solution containing the resulting polymer is continuously discharged from the polymerization tank.
- the polymer of a conjugated diene compound refers to a polymer of a conjugated diene compound, or a copolymer with an aromatic vinyl compound or other monomer copolymerizable with the conjugated diene compound.
- the conjugated diene compound used in the method for producing the polymer of the present embodiment is not particularly limited as long as it is a polymerizable monomer.
- 1,3-butadiene, isoprene, 2,3-dimethyl-1,3-butadiene 1,3-pentadiene, 3-methyl-1,3-pentadiene, 1,3-heptadiene, 1,3-hexadiene and the like are preferable from the viewpoint of industrial availability. These may be used alone or in combination of two or more.
- the total content concentration (mass) of these impurities in the conjugated diene compound is preferably 200 ppm or less, more preferably 100 ppm or less, and even more preferably 50 ppm or less.
- the allenes are not particularly limited, and examples thereof include propadiene and 1,2-butadiene. Although it does not specifically limit as acetylene, For example, ethyl acetylene, vinyl acetylene, etc. are mentioned.
- the aromatic vinyl polymer refers to a polymer of an aromatic vinyl compound or a copolymer of a conjugated diene compound or other monomer copolymerizable with the aromatic vinyl compound.
- the polymer is a monomer having a large content ratio.
- the aromatic vinyl compound used in the present embodiment is not particularly limited, and examples thereof include styrene, m or p-methylstyrene, ⁇ -methylstyrene, vinylethylbenzene, vinylxylene, vinylnaphthalene, diphenylethylene, and divinylbenzene.
- styrene is preferable from the viewpoint of industrial availability. These may be used alone or in combination of two or more.
- the other monomer copolymerizable with the conjugated diene compound or the aromatic vinyl compound is not particularly limited, and examples thereof include methacrylic acid ester, acrylic acid ester, acrylonitrile, acrylamide, cyclohexene, cyclohexadiene, and cyclopentene. These may be used alone or in combination of two or more.
- polymer of conjugated diene compound and polymer of aromatic vinyl compound ⁇ Polymerization form of polymer of conjugated diene compound and polymer of aromatic vinyl compound>
- the polymer of the conjugated diene compound or the polymer of the aromatic vinyl compound is a copolymer, it may be a random copolymer or a block copolymer.
- the random copolymer is not particularly limited, and examples thereof include a butadiene-isoprene random copolymer, a butadiene-styrene random copolymer, an isoprene-styrene random copolymer, and a butadiene-isoprene-styrene random copolymer.
- the composition distribution of each monomer in the copolymer chain is not particularly limited, and examples thereof include a completely random copolymer close to a statistical random composition, and a tapered (gradient) random copolymer having a gradient in composition distribution. It is done.
- the bonding mode of the conjugated diene that is, the composition such as 1,4-bond and 1,2-bond may be uniform or different depending on the molecular chain.
- the block copolymer Although it does not specifically limit as a block copolymer, for example, the 2 type block copolymer which consists of 2 blocks, the 3 type 3 block copolymer which consists of 3, 4 type 4 block copolymer etc. are mentioned It is done.
- a block composed of an aromatic vinyl compound such as styrene is represented by S
- a block composed of a conjugated diene compound such as butadiene or isoprene and / or a block composed of a copolymer of an aromatic vinyl compound and a conjugated diene compound
- the block copolymer is not particularly limited, and examples thereof include S—B2 type block copolymer, S—B—S3 type block copolymer, and S—B—S—B—4 type block copolymer. Can be mentioned.
- each block need not be clearly distinguished.
- the aromatic vinyl compound in the block B may be distributed uniformly or in a tapered shape.
- a plurality of portions where the aromatic vinyl compound is uniformly distributed and / or portions where the aromatic vinyl compound is distributed in a tapered shape may coexist in the block B.
- a plurality of segments having different aromatic vinyl compound contents may coexist in the block B.
- the organolithium compound used as the polymerization initiator is not particularly limited, and examples thereof include a low molecular compound and a solubilized oligomeric organolithium compound.
- the organic lithium compound represented by the bonding mode between the organic group and lithium is not particularly limited, and examples thereof include an organic lithium compound having a carbon-lithium bond, an organic lithium compound having a nitrogen-lithium bond, and a tin-lithium bond.
- organolithium compounds having a carbon-lithium bond examples thereof include an organic lithium compound having a carbon-lithium bond, an organic lithium compound having a nitrogen-lithium bond, and a tin-lithium bond.
- the organic lithium compound having a carbon-lithium bond is not particularly limited, and examples thereof include n-butyllithium, sec-butyllithium, tert-butyllithium, n-hexyllithium, benzyllithium, phenyllithium, and stilbenelithium. .
- the organic lithium compound composed of a nitrogen-lithium bond is not particularly limited, but for example, lithium dimethylamide, lithium diethylamide, lithium dipropylamide, lithium di-n-hexylamide, lithium diisopropylamide, lithium hexamethyleneimide, lithium pyrrolidide, Examples include lithium piperidide, lithium heptamethylene imide, and lithium morpholide.
- organolithium compound not only the above monoorganolithium compound but also a polyfunctional organolithium compound can be used, or a monoorganolithium compound and a polyfunctional organolithium compound can be used in combination.
- the polyfunctional organolithium compound is not particularly limited.
- 1,4-dilithiobutane a reaction product of sec-butyllithium and diisopropenylbenzene, 1,3,5-trilithiobenzene, n-butyllithium and 1 , 3-butadiene and a reaction product of divinylbenzene, a reaction product of n-butyllithium and a polyacetylene compound, and the like.
- organolithium compounds disclosed in US Pat. No. 5,708,092, British Patent 2,241,239, US Pat. No. 5,527,753, etc. should be used. You can also.
- n-butyllithium and sec-butyllithium are preferable from the viewpoints of industrial availability and ease of control of the polymerization reaction.
- the organic lithium compound may be used as a mixture of not only one type but also two or more types.
- the organolithium compound is used for the polymerization in a state in which the organolithium compound is in a solution containing the organolithium compound in order to improve the handleability and dispersibility in the polymerization solution.
- a solution containing an organolithium compound For example, the solution etc. which diluted the organolithium compound with the hydrocarbon solvent are mentioned.
- the hydrocarbon solvent are not particularly limited, and examples thereof include C4 to C8 aliphatic hydrocarbons, toluene, xylene, and the like.
- the hydrocarbon used as the solvent may be cyclic and may contain an unsaturated bond or a branched structure.
- C5 and C6 hydrocarbons are preferable because the boiling point and vapor pressure are easy to handle in the production process.
- pentane, normal hexane (n-hexane), and cyclohexane are preferably used.
- the concentration of the organolithium compound in the solution containing the organolithium compound when fed to the polymerization tank is in the range of 0.005 to 1% by mass from the viewpoint of polymerization initiation efficiency and uniform mixing with the monomer. More preferably, the content is 0.01 to 1% by mass, still more preferably 0.01 to 0.5% by mass, and particularly preferably 0.01 to 0.1% by mass.
- the organolithium compound is usually stored in a storage tank in a state diluted with a solvent (for example, a hydrocarbon solvent) so as to have a concentration of 10 to 20% by mass.
- a solvent for example, a hydrocarbon solvent
- the concentration of the organolithium compound is adjusted to the above range immediately before the solution containing the organolithium compound is fed to the polymerization tank.
- the method for adjusting the concentration of the organolithium compound is not particularly limited, but a method of continuously adjusting the concentration of the organolithium compound in the pipe for feeding to the polymerization tank is preferable because of its high efficiency.
- a solution containing an organolithium compound having a concentration of 10 to 20% by mass is flowed to one of the pipes to be connected, and a diluting solvent (for example, a hydrocarbon solvent) is flowed to the other pipe.
- a diluting solvent for example, a hydrocarbon solvent
- the dilution solvent flows through the venturi tube, and the solution containing the organolithium compound having a concentration of 10 to 20% by mass joins at the throttle portion of the venturi tube, thereby improving the uniformity of the organolithium compound.
- the position for supplying the solution containing the organolithium compound in the polymerization tank is not particularly limited, but the bottom of the polymerization tank is preferable from the viewpoint of the yield of the polymerization reaction.
- the bottom of the polymerization tank is below the half height in the vertical direction of the polymerization tank, more preferably 1/5 or less in the vertical direction of the polymerization tank.
- the method for producing a polymer according to this embodiment includes a step (1) of feeding a monomer containing at least a conjugated diene compound and / or an aromatic vinyl compound to a polymerization tank.
- step (1) a monomer containing a conjugated diene compound and / or an aromatic vinyl compound is continuously fed to a polymerization tank.
- the monomer containing the conjugated diene compound and / or the aromatic vinyl compound may be fed alone to the polymerization tank, or may be fed to the polymerization tank in a solution containing a solvent. From the viewpoint of handleability in the monomer purification step and polymerization step, it is preferable to feed in a solution containing a solvent.
- the solvent include C4 to C8 aliphatic hydrocarbons, toluene, xylene, and the like.
- the hydrocarbon used as the solvent may be cyclic and may contain an unsaturated bond or a branched structure.
- C5 and C6 hydrocarbons are preferable because the boiling point and vapor pressure are easy to handle in the production process.
- pentane, normal hexane (n-hexane), and cyclohexane are preferably used.
- the concentration of the monomer in the state of the solution containing the solvent is preferably 10 to 50% by mass from the viewpoint of the mixing property between the monomer and the organolithium compound and the heat removal from the polymerization heat.
- the method for producing a polymer according to this embodiment includes a step (2) of feeding a solution containing an organolithium compound to a polymerization tank.
- step (2) the solution containing the organolithium compound is continuously fed to the polymerization tank.
- the solution containing an organolithium compound is diluted by the above-mentioned method when fed to a polymerization tank.
- the linear velocity at the opening of the feed port of the solution containing the organolithium compound is 0.1 to 5 m / sec from the viewpoint of suppression of gel formation and yield.
- the linear velocity is preferably 0.5 to 2 m / sec, and preferably 0.7 to 1.5 m / sec, from the viewpoint of the miscibility of the organolithium compound and the monomer in the polymerization tank. More preferred.
- the linear velocity is a numerical value (F / S) obtained by dividing the flow rate of organic lithium (F [m 3 / sec]) fed into the polymerization tank by the cross-sectional area (S [m 2 ]) of the feed pipe. ).
- the opening part of a feed port means the coupling
- the step (1) and the step (2) are continuously performed at the same time, and the polymerization reaction of the conjugated diene compound and / or the aromatic vinyl compound is continuously performed in the polymerization tank.
- the polymer solution of the conjugated diene compound and / or aromatic vinyl compound to be produced is continuously discharged from the polymerization tank.
- the polymerization tank may be a continuous, batch or semi-batch polymerization tank, but a continuous polymerization tank is preferable because the effects of the present invention are remarkably exhibited.
- the continuous polymerization tank is not particularly limited, and examples thereof include one or two or more connected polymerization tanks. When two or more connected polymerization tanks are used, the resulting conjugated diene compound or The molecular weight distribution of the polymer of the aromatic vinyl compound can be narrowed, which is preferable from the viewpoint of controlling the molecular weight distribution.
- the polymerization tank used in this embodiment is not particularly limited, and examples thereof include a tank-type or tube-type polymerization tank with a stirrer.
- the polymerization tank used in this embodiment has a feed port for feeding a solution containing an organolithium compound.
- the position of the feed port is not particularly limited, but it is preferably at the bottom of the polymerization tank from the viewpoint of operability at the start of continuous polymerization.
- the inner diameter of the feed port can be appropriately selected within a range that does not hinder the linear velocity at the opening of the feed port of the solution containing the organolithium compound described above.
- the inner diameter of the feed port piping is preferably 1 to 100 mm, more preferably 3 to 50 mm, and even more preferably 5 to 30 mm.
- the relationship between the concentration (C mass%) of the organolithium compound in the solution and the linear velocity (Vm / sec) of the solution in the opening is preferably 1 ⁇ (V / C) ⁇ 200, and 7 ⁇ (V / C ) ⁇ 110 is more preferable, and 10 ⁇ (V / C) ⁇ 50 is particularly preferable.
- the polymerization tank used in this embodiment preferably has a size of 0.05 to 100 m 3 from the viewpoint of the balance between productivity and heat removal.
- the ratio (L / D) of the polymerization tank length (L) to the inner diameter (D) is preferably 0.5 to 20 from the viewpoint of the polymerization reaction yield and the control of the molecular weight distribution. 10 is more preferable, and 2 to 8 is even more preferable.
- the temperature in the steps (1) and (2) is preferably 0 to 80 ° C., more preferably 20 to 40 ° C.
- the method for producing the polymer of the present embodiment includes a step of feeding a solvent to the polymerization tank.
- the solvent is not particularly limited, and examples thereof include hydrocarbon solvents such as saturated hydrocarbons and aromatic hydrocarbons.
- aliphatic hydrocarbons such as butane, pentane, hexane and heptane
- alicyclic hydrocarbons such as cyclopentane, cyclohexane, methylcyclopentane and methylcyclohexane
- aromatic hydrocarbons such as benzene, toluene and xylene
- hydrocarbons composed of a mixture thereof examples thereof include hydrocarbons composed of a mixture thereof.
- These solvents may contain impurities such as allenes and acetylenes.
- impurities such as allenes and acetylenes.
- a polymer having a high concentration of active terminals tends to be obtained, and further, the polymer is modified. It is preferable because a high modification rate tends to be achieved.
- the solvent may be fed to the polymerization tank in a state where it is mixed with the monomer or the organolithium compound, or may be fed to the polymerization tank alone, but from the viewpoint of uniform mixing in the polymerization tank, it is simple. It is preferable to feed to the polymerization tank in a state of being mixed with a monomer or an organic lithium compound.
- a polar compound may be added in the polymerization reaction of the conjugated diene compound and / or the aromatic vinyl compound. Therefore, the method for producing a polymer according to this embodiment may include a step of feeding a polar compound to the polymerization tank.
- the polar compound can be used for randomly copolymerizing an aromatic vinyl compound with a conjugated diene compound, and can also be used as a vinylating agent for controlling the microstructure of the conjugated diene portion. It is also effective in improving the polymerization rate.
- the polar compound is not particularly limited, and examples thereof include tetrahydrofuran, diethyl ether, dioxane, ethylene glycol dimethyl ether, ethylene glycol dibutyl ether, diethylene glycol dimethyl ether, diethylene glycol dibutyl ether, dimethoxybenzene, 2,2-bis (2-oxolanyl) propane, and the like.
- Ethers; tertiary amine compounds such as tetramethylethylenediamine, dipiperidinoethane, trimethylamine, triethylamine, pyridine, quinuclidine; potassium-t-amylate, potassium-t-butylate, sodium-t-butylate, sodium amylate, etc.
- Alkali metal alkoxide compounds of the above; phosphine compounds such as triphenylphosphine can be used. These polar compounds may be used alone or in combination of two or more.
- the amount of the polar compound used is not particularly limited and can be selected according to the purpose. Usually, the amount is preferably 0.01 to 100 mol with respect to 1 mol of the polymerization initiator. An appropriate amount of such a polar compound (vinylating agent) can be used as a regulator of the microstructure of the polymer conjugated diene moiety depending on the desired vinyl bond amount.
- a method for randomizing the conjugated diene compound and the aromatic vinyl compound is not particularly limited.
- 1,3-butadiene may be produced during copolymerization. You may use the method of adding a part intermittently.
- the polar compound may be fed alone to the polymerization tank, or may be fed to the polymerization tank in a solution containing a solvent or in a mixed solution with the monomer solution. It is preferable to feed the polymerization tank in a mixed solution with the monomer solution.
- Polymerization step In the polymer production method of the present embodiment, a polymer of a conjugated diene compound and / or an aromatic vinyl compound by a polymerization reaction (polymerization step) of a monomer containing a conjugated diene compound and / or an aromatic vinyl compound. Is obtained.
- the polymerization temperature is not particularly limited as long as the polymerization reaction of the monomer containing the conjugated diene compound and / or aromatic vinyl compound proceeds, but from the viewpoint of productivity, it is preferably 0 ° C. or higher. From the viewpoint of sufficiently ensuring the amount of the modifying agent to react with the active terminal of the polymer after completion of the polymerization, it is preferably 120 ° C. or lower.
- the polymer production method of the present embodiment is a process of obtaining a modified polymer by reacting a modifier with the conjugated diene compound and / or aromatic vinyl compound polymer obtained in the above-described polymerization process (modification process). ) May be included.
- the polymer of a conjugated diene compound and / or an aromatic vinyl compound obtained in the above-described polymerization step usually has a polymerization active terminal.
- a modified polymer can be obtained by reacting a modifier having a functional group with the polymerization active terminal of such a polymer.
- a compound having at least one functional group is used.
- modifier having an alkoxysilyl group are not particularly limited.
- modifiers having an alkoxysilyl group it is preferable to use a compound having a nitrogen (N) atom and a plurality of alkoxysilyl groups in the molecule.
- the compound having a nitrogen (N) atom and a plurality of alkoxysilyl groups in the molecule are not particularly limited.
- 2,2-dimethoxy-1- (3-trimethoxysilylpropyl) -1 -Aza-2-silacyclopentane 2,2-diethoxy-1- (3-triethoxysilylpropyl) -1-aza-2-silacyclopentane, 2,2-dimethoxy-1- (4-trimethoxysilyl) Butyl) -1-aza-2-silacyclohexane, 2,2-dimethoxy-1- (5-trimethoxysilylpentyl) -1-aza-2-silacycloheptane, 2,2-dimethoxy-1- (3- Dimethoxymethylsilylpropyl) -1-aza-2-silacyclopentane, 2,2-diethoxy-1- (3-diethoxyethylsilylpropyl) -1-aza-2-silyl)
- 2,2-dimethoxy-1- (3-trimethoxysilylpropyl) -1-aza-2 is used from the viewpoint of the reactivity and interaction between the functional group of the modifier and an inorganic filler such as silica.
- -Silacyclopentane, 2,2-diethoxy-1- (3-triethoxysilylpropyl) -1-aza-2-silacyclopentane, 1- [3- (triethoxysilyl) -propyl] -4-methylpiperazine Is preferred.
- the modifier may be fed alone to the polymerization tank or may be diluted with a solvent and then fed to the polymerization tank, but the conjugated diene compound and / or aromatic vinyl compound is uniformly dispersed in the polymer solution. From the viewpoint of properties, it is preferable to dilute with a solvent and then feed to the polymerization tank.
- the solvent is not particularly limited as long as it is not reactive with the living polymer or the modifier. Specifically, for example, aliphatic hydrocarbons such as butane, pentane, hexane, heptane; cyclopentane, cyclohexane, methylcyclopentane. And alicyclic hydrocarbons such as methylcyclohexane; aromatic hydrocarbons such as benzene, toluene and xylene, and hydrocarbons composed of mixtures thereof.
- the method for producing the polymer of the present embodiment includes a deactivator, a neutralizing agent, and the like, if necessary, in the polymer solution of the conjugated diene compound and / or aromatic vinyl compound obtained after the completion of the polymerization.
- the process of adding may be included.
- a quencher For example, alcohol; alcohol, such as water; methanol, ethanol, isopropanol, etc. are mentioned.
- the neutralizing agent is not particularly limited, and examples thereof include carboxylic acids such as stearic acid, oleic acid, and versatic acid, aqueous solutions of inorganic acids, carbon dioxide gas, and the like.
- the method for producing the polymer of the present embodiment can be obtained from the viewpoint of preventing gel formation after polymerization and improving the stability at the time of processing, from the obtained conjugated diene compound and / or aromatic vinyl compound. It is preferable to include a step of adding a rubber stabilizer to the coalescence.
- the stabilizer for rubber is not particularly limited, and a known stabilizer can be used.
- BHT 2,6-di-tert-butyl-4-hydroxytoluene
- Antioxidants such as -hydroxy-3 ', 5'-di-tert-butylphenol) propinate and 2-methyl-4,6-bis [(octylthio) methyl] phenol are preferred.
- a polymer of a conjugated diene compound and / or an aromatic vinyl compound is obtained from a polymer solution of the obtained conjugated diene compound and / or aromatic vinyl compound. It is preferable to include a process.
- the method for obtaining the polymer of the conjugated diene compound and / or aromatic vinyl compound from the polymer solution of the conjugated diene compound and / or aromatic vinyl compound is not particularly limited, and a known method can be used. For example, after separating the solvent from the polymer solution of the conjugated diene compound and / or aromatic vinyl compound by steam stripping or the like, the polymer of the conjugated diene compound and / or aromatic vinyl compound is separated by filtration, and further dehydrated and removed.
- a polymer solution of the conjugated diene compound and / or aromatic vinyl compound is directly devolatilized with a drum dryer or the like, and / or Examples thereof include a method for obtaining a polymer of an aromatic vinyl compound.
- the obtained mixture was mixed with n-butyllithium 0.84 mmol / min with a static mixer immediately before entering the polymerization tank to treat the deactivation cause substance of the polymerization initiator contained in the monomer, and the single amount A body mixture was obtained.
- the obtained monomer mixture was continuously fed to the polymerization tank from the bottom, and 2,2-bis (2-oxolanyl) propane was continuously fed to the polymerization tank from the bottom at a rate of 0.40 g / min. Feeded.
- a pipe for feeding a polymerization initiator is a pipe containing 1.12 g / min of a hexane solution containing 20% by mass of n-butyllithium (polymerization initiator) and 1,650 cc / min of n-hexane. Then, the obtained mixed solution was fed from the bottom of the polymerization tank to the polymerization tank through a pipe having an inner diameter of 6 mm.
- the linear velocity of the mixed solution is 0.97 m / sec at the outlet of the pipe (the opening of the feed port of the solution containing the polymerization initiator (n-butyllithium)), and the n-butyllithium in the mixed solution
- concentration was 0.02% by mass.
- a copolymerization reaction of 1,3-butadiene and styrene proceeded in the polymerization tank, and a living polymer solution having a temperature of 90 ° C. was discharged from the outlet pipe at the top of the polymerization tank.
- the inside of the polymerization tank was completely filled with the polymerization solution. It was confirmed by gas chromatography measurement of the polymer solution that no unreacted styrene monomer or 1,3-butadiene monomer remained in the polymer solution. After the above copolymerization reaction was continued for 120 hours, the feed of the raw material was stopped and all the solution in the polymerization tank was withdrawn, and the peripheral portion of the polymerization initiator (n-butyllithium) feed port was observed. It was not confirmed.
- Example 2 Example 1 except that the feed amount of the hexane solution containing 20% by mass of n-butyllithium was 3.36 g / min and the feed amount of n-hexane was 1,100 cc / min in the pipe for feeding the polymerization initiator As in Example 1, a copolymer of 1,3-butadiene and styrene was produced.
- the linear velocity of the solution containing the polymerization initiator at the outlet of the pipe for feeding the polymerization initiator (the opening of the feed port of the solution containing the polymerization initiator (n-butyllithium)) is 0.65 m / sec.
- a copolymerization reaction of 1,3-butadiene and styrene proceeded in the polymerization tank, and a living polymer solution having a temperature of 90 ° C. was discharged from the outlet pipe at the top of the polymerization tank. It was confirmed by gas chromatography measurement of the polymer solution that no unreacted styrene monomer or 1,3-butadiene monomer remained in the polymer solution.
- Example 3 A copolymer of 1-3 butadiene and styrene was produced as follows. A 200 liter reactor equipped with four paddle stirring blades was used as the polymerization tank. In a pipe that feeds raw materials to the polymerization tank, 1,3-butadiene from which impurities such as moisture have been removed is mixed at 440 g / min, styrene at 142 g / min, and n-hexane at 2,580 g / min. Got.
- the obtained mixture was mixed with 1.68 mmol / min of n-butyllithium with a static mixer immediately before entering the polymerization tank to treat the deactivation cause substance of the polymerization initiator contained in the monomer, so A body mixture was obtained.
- the obtained monomer mixture was continuously fed to the polymerization tank from the bottom, and 2,2-bis (2-oxolanyl) propane was continuously fed from the bottom to the polymerization tank at a rate of 0.8 g / min. Feeded.
- a pipe for feeding a polymerization initiator includes 6.72 g / min of a hexane solution containing 20% by mass of n-butyllithium (polymerization initiator) and 3,300 cc / min of n-hexane. Then, the obtained mixed solution was fed from the bottom of the polymerization tank to the polymerization tank through a pipe having an inner diameter of 6 mm. At this time, the linear velocity of the mixed solution is 1.9 m / sec at the outlet of the pipe (the opening of the feed port of the solution containing the polymerization initiator (n-butyllithium)), and the n-butyllithium in the mixed solution The concentration was 0.061% by mass.
- V / C 32.
- a copolymerization reaction of 1,3-butadiene and styrene proceeded in the polymerization tank, and a living polymer solution having a temperature of 90 ° C. was discharged from the outlet pipe at the top of the polymerization tank. It was confirmed by gas chromatography measurement of the polymer solution that no unreacted styrene monomer or 1,3-butadiene monomer remained in the polymer solution. After the above copolymerization reaction was continued for 120 hours, the feed of the raw material was stopped and all the solution in the polymerization tank was withdrawn, and the peripheral portion of the polymerization initiator (n-butyllithium) feed port was observed. It was not confirmed.
- Example 4 In a pipe for feeding a polymerization example initiator, the feed amount of a hexane solution containing 20% by mass of n-butyllithium (polymerization initiator) is 6.72 g / min, and the feed amount of n-hexane is 2,200 cc / min.
- a copolymer of 1,3-butadiene and styrene was produced in the same manner as in Example 1 except for the above.
- the linear velocity of the solution containing the polymerization initiator (n-butyllithium) at the outlet of the pipe for feeding the polymerization initiator is 1.3 m / sec, and the concentration of the polymerization initiator (n-butyllithium) in the solution containing the polymerization initiator (n-butyllithium) was 0.093% by mass.
- V / C 14.
- a copolymerization reaction of 1,3-butadiene and styrene proceeded in the polymerization tank, and a living polymer solution having a temperature of 90 ° C. was discharged from the outlet pipe at the top of the polymerization tank.
- Example 5 Production of styrene polymer in the same manner as in Example 1, except that the monomer fed to the polymerization tank was changed to 1,3-butadiene, 220 g / min, styrene, 71 g / min instead of a mixture of styrene 300 g / min. Went. It was confirmed by gas chromatography measurement of the polymer solution that no unreacted styrene monomer remained in the polymer solution discharged from the outlet pipe at the top of the polymerization tank.
- Example 1 A copolymer of 1,3-butadiene and styrene was produced in the same manner as in Example 1 except that the inner diameter of the pipe for feeding the polymerization initiator was 21 mm.
- the linear velocity of the solution containing the polymerization initiator (n-butyllithium) at the outlet of the piping for feeding the polymerization initiator is 0.079 m / sec, and the concentration of the polymerization initiator (n-butyllithium) in the solution containing the polymerization initiator (n-butyllithium) was 0.02% by mass.
- V / C 3.9.
- a copolymerization reaction of 1,3-butadiene and styrene proceeded in the polymerization tank, and a living polymer solution having a temperature of 90 ° C. was discharged from the outlet pipe at the top of the polymerization tank. It was confirmed by gas chromatography measurement of the polymer solution that no unreacted styrene monomer or 1,3-butadiene monomer remained in the polymer solution.
- the feed of the raw material is stopped, all the solution in the polymerization tank is withdrawn, and when the periphery of the polymerization initiator (n-butyllithium) feed port is observed, the adhesion of the gel is confirmed. It was.
- the linear velocity of the mixed solution is 6.1 m / sec at the outlet of the pipe (the opening of the feed port of the solution containing the polymerization initiator (n-butyllithium)), and the n-butyllithium in the mixed solution
- concentration was 0.01% by mass.
- V / C 598. It was confirmed by gas chromatography analysis of the polymerization solution that unreacted styrene monomer and 1,3-butadiene monomer remained in the polymer solution obtained from the outlet pipe at the top of the polymerization tank.
- the production method of the present invention it is possible to produce a polymer of conjugated diene and / or aromatic vinyl free from gel contamination as a result of suppressing the gel adhesion around the polymerization initiator feed port in the polymerization tank.
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Abstract
Description
[1]
重合槽に共役ジエン化合物及び/又は芳香族ビニル化合物を含む単量体を連続的にフィードする工程(1)と、
重合槽に有機リチウム化合物を含む溶液を連続的にフィードする工程(2)と、
を含み、
前記工程(2)において、有機リチウム化合物を含む溶液のフィード口の開口部での線速度が0.1~5m/secである、重合体の製造方法。
[2]
前記単量体が少なくとも共役ジエン化合物を含む、[1]に記載の重合体の製造方法。
[3]
前記重合槽にフィードされる前記有機リチウム化合物を含む溶液における有機リチウム化合物の濃度が0.01~1質量%である、[1]又は[2]に記載の重合体の製造方法。
本実施形態の重合体の製造方法は、重合槽に共役ジエン化合物及び/又は芳香族ビニル化合物を含む単量体を連続的にフィードする工程(1)と、重合槽に有機リチウム化合物を含む溶液を連続的にフィードする工程(2)と、を含み、前記工程(2)において、有機リチウム化合物を含む溶液のフィード口の開口部での線速度が0.1~5m/secである。
得られる重合体は共役ジエン化合物及び/又は芳香族ビニル化合物の重合体であることが好ましく、共役ジエン化合物の重合体であることが好ましい。
本実施形態において、共役ジエン化合物の重合体とは、共役ジエン化合物の重合体、又は共役ジエン化合物と共重合可能な芳香族ビニル化合物や他の単量体との共重合体をいう。
本実施形態の重合体の製造方法に用いる共役ジエン化合物は、重合可能な単量体であれば特に限定されず、例えば1,3-ブタジエン、イソプレン、2,3-ジメチル-1,3-ブタジエン、1,3-ペンタジエン、3-メチル-1,3-ペンタジエン、1,3-ヘプタジエン、1,3-ヘキサジエン等が挙げられる。これらの中でも、工業的入手の容易さの観点から、1,3-ブタジエン、イソプレンが好ましい。これらは1種のみならず2種以上を併用してもよい。共役ジエン化合物中に、アレン類、アセチレン類等が不純物として含有されていると、後述する変性反応を阻害するおそれがある。そのため、共役ジエン化合物中のこれらの不純物の含有量濃度(質量)の合計は、200ppm以下であることが好ましく、100ppm以下であることがより好ましく、50ppm以下であることが更に好ましい。
本実施形態において、芳香族ビニル重合体とは、芳香族ビニル化合物の重合体、又は芳香族ビニル化合物と共重合可能な共役ジエン化合物や他の単量体との共重合体をいう。
なお、共役ジエン化合物と芳香族ビニル化合物を含む場合は、含有質量比の多い単量体の重合体とする。
<芳香族ビニル化合物>
本実施形態に用いる芳香族ビニル化合物は、特に限定されず、例えばスチレン、m又はp-メチルスチレン、α-メチルスチレン、ビニルエチルベンゼン、ビニルキシレン、ビニルナフタレン、ジフェニルエチレン、ジビニルベンゼン等が挙げられる。これらの中でも、工業的入手の容易さの観点から、スチレンが好ましい。これらは1種のみならず2種以上を併用してもよい。
共役ジエン化合物又は芳香族ビニル化合物と共重合可能な他の単量体としては、特に限定されず、例えばメタクリル酸エステル、アクリル酸エステル、アクリロニトリル、アクリルアミド、シクロヘキセン、シクロヘキサジエン、シクロペンテン等が挙げられる。これらは1種のみならず2種以上を併用してもよい。
共役ジエン化合物の重合体、芳香族ビニル化合物の重合体が共重合体である場合、ランダム共重合体であってもブロック共重合体であってもよい。
本実施形態の重合体の製造方法において、重合開始剤として用いる有機リチウム化合物としては、特に限定されないが、例えば、低分子化合物や可溶化したオリゴマーの有機リチウム化合物が挙げられる。また、有機基とリチウムとの結合様式で表した有機リチウム化合物としては、特に限定されないが、例えば、炭素-リチウム結合を有する有機リチウム化合物、窒素-リチウム結合を有する有機リチウム化合物、錫-リチウム結合を有する有機リチウム化合物等が挙げられる。
上記方法では混合性を良くすることを目的に、ベンチュリ管が用いることが好ましい。希釈溶剤がベンチュリ管を流れ、10~20質量%の濃度の有機リチウム化合物を含む溶液がベンチュリ管の絞り部分で合流することで、有機リチウム化合物の均一性が向上する効果がある。
重合槽において有機リチウム化合物を含む溶液を供給する位置は特に限定されないが、重合槽の底部であると、重合反応の収率の観点から好ましい。ここで重合槽の底部とは重合槽の縦方向の高さ半分より下方であり、より好ましくは重合槽の縦方向の高さ1/5以下である。
本実施形態の重合体の製造方法は、重合槽に少なくとも共役ジエン化合物及び/又は芳香族ビニル化合物を含む単量体をフィードする工程(1)を含む。工程(1)において、共役ジエン化合物及び/又は芳香族ビニル化合物を含む単量体は重合槽に連続的にフィードされる。
本実施形態の重合体の製造方法は、重合槽に有機リチウム化合物を含む溶液をフィードする工程(2)を含む。工程(2)において、有機リチウム化合物を含む溶液は重合槽に連続的にフィードされる。また、有機リチウム化合物を含む溶液は、重合槽にフィードされる際に前述の方法により希釈されることが好ましい。
重合槽としては連続式、バッチ式、セミバッチ式の何れの重合槽でもよいが、連続式の重合槽であると、本発明の効果が著しく発現され、好ましい。連続式の重合槽は、特に限定されないが、例えば、1個又は2個以上の連結された重合槽が挙げられるが、2個以上の連結された重合槽であると、得られる共役ジエン化合物や芳香族ビニル化合物の重合体の分子量分布を狭くすることができ、分子量分布の制御の観点からも好ましい。
また、溶液中の有機リチウム化合物の濃度(C質量%)と開口部における溶液の線速度(Vm/sec)の関係は、1<(V/C)<200が好ましく、7<(V/C)<110がより好ましく、10<(V/C)<50が特に好ましい。
連続式の重合においては重合槽内が完全に重合溶液で満たされていると、気相部内壁面への重合物の付着が抑制されることから好ましい。
工程(1)、(2)における温度は0~80℃であることが好ましく、20~40℃であることがより好ましい。
本実施形態の重合体の製造方法において、共役ジエン化合物及び/又は芳香族ビニル化合物の重合反応は、溶媒中で行うことが好ましい。そのため、本実施形態の重合体の製造方法は、重合槽に溶媒をフィードする工程を含むことが好ましい。溶媒としては、特に限定されないが、例えば、飽和炭化水素、芳香族炭化水素等の炭化水素系溶媒が挙げられる。具体的には、ブタン、ペンタン、ヘキサン、ヘプタン等の脂肪族炭化水素;シクロペンタン、シクロヘキサン、メチルシクロペンタン、メチルシクロヘキサン等の脂環族炭化水素;ベンゼン、トルエン、キシレン等の芳香族炭化水素及びそれらの混合物からなる炭化水素等が挙げられる。
本実施形態の重合体の製造方法において、共役ジエン化合物及び/又は芳香族ビニル化合物の重合反応においては、極性化合物を添加してもよい。そのため、本実施形態の重合体の製造方法は、重合槽に極性化合物をフィードする工程を含んでいてもよい。極性化合物は、芳香族ビニル化合物を共役ジエン化合物とランダムに共重合させるために用いることができ、共役ジエン部のミクロ構造を制御するためのビニル化剤としても用いることができる。また、重合速度の改善等にも効果がある。
本実施形態の重合体の製造方法において、共役ジエン化合物及び/又は芳香族ビニル化合物を含む単量体の重合反応(重合工程)により共役ジエン化合物及び/又は芳香族ビニル化合物の重合体が得られる。
本実施形態の重合体の製造方法は、上述の重合工程で得られる共役ジエン化合物及び/又は芳香族ビニル化合物の重合体に変性剤を反応させ、変性重合体を得る工程(変性工程)を含んでいてもよい。上述の重合工程で得られる共役ジエン化合物及び/又は芳香族ビニル化合物の重合体は、通常、重合活性末端を有する。このような重合体の重合活性末端に、官能基を有する変性剤を反応させることで、変性重合体を得ることができる。変性剤としては好適にはグリシジル基、アルコキシシリル基、カルボニル基、カルボン酸エステル基、カルボン酸アミド基、酸無水物基、リン酸エステル基、亜リン酸エステル其、エピチオ基、チオカルボニル基、チオカルボン酸エステル基、ジチオカルボン酸エステル基、チオカルボン酸アミド基、イミノ基、エチレンイミン基、ハロゲン基、アルコキシシラン基、イソシアネート基、チオイソシアネート基、共役ジエン基及びアリールビニル基からなる群より選択される1種以上の官能基を有する化合物が用いられる。
本実施形態の重合体の製造方法は、重合終了後、得られる共役ジエン化合物及び/又は芳香族ビニル化合物の重合体溶液に必要に応じて、失活剤、中和剤等を添加する工程を含んでいてもよい。失活剤としては、特に限定されないが、例えば水;メタノール、エタノール、イソプロパノール等のアルコール等が挙げられる。中和剤としては、特に限定されないが、例えばステアリン酸、オレイン酸、バーサチック酸等のカルボン酸、無機酸の水溶液、炭酸ガス等が挙げられる。
1,3-ブタジエンとスチレンとの共重合体を以下のとおり製造した。長さ(L)と内径(D)との比(L/D)=5で、4枚パドルの撹拌翼を具備する100リットルの反応器を重合槽として用いた。重合槽に原料をフィードする配管において、水分等の不純物を除去した1,3-ブタジエンを220g/分、スチレンを71g/分、n-ヘキサンを1,290g/分の条件で混合して、混合物を得た。更に得られた混合物を、重合槽に入る直前でn-ブチルリチウム0.84mmol/分とスタティックミキサーで混合して単量体中に含まれる重合開始剤の失活原因物質を処理して単量体混合物を得た。得られた単量体混合物を、重合槽に底部から連続的にフィードし、また、2,2-ビス(2-オキソラニル)プロパンを0.40g/分の速度で重合槽に底部から連続的にフィードした。上記配管とは別に、重合開始剤フィード用の配管において、20質量%のn-ブチルリチウム(重合開始剤)を含むヘキサン溶液1.12g/分と、n-ヘキサン1,650cc/分とを配管内で混合した後、得られた混合溶液を重合槽底部から内径6mmの配管を通して重合槽にフィードした。
この時の配管出口(重合開始剤(n-ブチルリチウム)を含む溶液のフィード口の開口部)において、混合溶液の線速度は0.97m/secであり、混合溶液中のn-ブチルリチウムの濃度は0.02質量%であった。また、混合溶液中のn-ブチルリチウムの濃度(C質量%)と開口部における混合溶液の線速度(Vm/sec)の関係は、V/C=48であった。重合槽内部では1,3-ブタジエンとスチレンとの共重合反応が進行し、重合槽頭頂部の出口配管からは温度90℃のリビングポリマー溶液が排出された。この際、重合槽内部は重合液で完全に充填された状態であった。このポリマー溶液に未反応のスチレン単量体や1,3-ブタジエン単量体が残存しないことはポリマー溶液のガスクロマトグラフィー測定によって確認された。上記共重合反応を120時間継続した後、原料のフィードを止めて重合槽内の溶液を全て抜出し、重合開始剤(n-ブチルリチウム)のフィード口の周辺部分を観察したが、ゲルの付着は確認されなかった。
重合開始剤フィード用の配管において、20質量%のn-ブチルリチウムを含むヘキサン溶液のフィード量を3.36g/分とし、n-ヘキサンのフィード量を1,100cc/分とした他は実施例1と同様に1,3-ブタジエンとスチレンとの共重合体の製造を行った。重合開始剤フィード用の配管出口(重合開始剤(n-ブチルリチウム)を含む溶液のフィード口の開口部)において、重合開始剤を含む溶液の線速度は0.65m/secであり、重合開始剤を含む溶液中の重合開始剤(n-ブチルリチウム)の濃度は0.091質量%であった。また、V/C=7.1であった。重合槽内部では1,3-ブタジエンとスチレンとの共重合反応が進行し、重合槽頭頂部の出口配管からは温度90℃のリビングポリマー溶液が排出された。このポリマー溶液に未反応のスチレン単量体や1,3-ブタジエン単量体が残存しないことはポリマー溶液のガスクロマトグラフィー測定によって確認された。共重合反応を120時間継続した後、原料のフィードを止めて重合槽内の溶液を全て抜出し、重合開始剤(n-ブチルリチウム)のフィード口の周辺部分を観察したが、ゲルの付着は確認されなかった。
1-3ブタジエンとスチレンとの共重合体を以下のとおり製造した。4枚パドルの撹拌翼を具備する200リットルの反応器を重合槽として用いた。重合槽に原料をフィードする配管において、水分等の不純物を除去した1,3-ブタジエンを440g/分、スチレンを142g/分、n-ヘキサンを2,580g/分の条件で混合して、混合物を得た。更に得られた混合物を、重合槽に入る直前でn-ブチルリチウム1.68mmol/分とスタティックミキサーで混合して単量体中に含まれる重合開始剤の失活原因物質を処理して単量体混合物を得た。得られた単量体混合物を、重合槽に底部から連続的にフィードし、また、2,2-ビス(2-オキソラニル)プロパンを0.8g/分の速度で重合槽に底部から連続的にフィードした。上記配管とは別に、重合開始剤フィード用の配管において、20質量%のn-ブチルリチウム(重合開始剤)を含むヘキサン溶液6.72g/分と、n-ヘキサン3,300cc/分とを配管内で混合した後、得られた混合溶液を重合槽底部から内径6mmの配管を通して重合槽にフィードした。この時の配管出口(重合開始剤(n-ブチルリチウム)を含む溶液のフィード口の開口部)において、混合溶液の線速度は1.9m/secであり、混合溶液中のn-ブチルリチウムの濃度は0.061質量%であった。また、V/C=32であった。重合槽内部では1,3-ブタジエンとスチレンとの共重合反応が進行し、重合槽頭頂部の出口配管からは温度90℃のリビングポリマー溶液が排出された。このポリマー溶液に未反応のスチレン単量体や1,3-ブタジエン単量体が残存しないことはポリマー溶液のガスクロマトグラフィー測定によって確認された。上記共重合反応を120時間継続した後、原料のフィードを止めて重合槽内の溶液を全て抜出し、重合開始剤(n-ブチルリチウム)のフィード口の周辺部分を観察したが、ゲルの付着は確認されなかった。
重合開例始剤フィード用の配管において、20質量%のn-ブチルリチウム(重合開始剤)を含むヘキサン溶液のフィード量を6.72g/分とし、n-ヘキサンのフィード量を2,200cc/分とした他は実施例1と同様に1,3-ブタジエンとスチレンとの共重合体の製造を行った。重合開始剤フィード用の配管出口(重合開始剤(n-ブチルリチウム)を含む溶液のフィード口の開口部)において、重合開始剤(n-ブチルリチウム)を含む溶液の線速度は1.3m/secであり、重合開始剤(n-ブチルリチウム)を含む溶液中の重合開始剤(n-ブチルリチウム)の濃度は0.093質量%であった。また、V/C=14であった。重合槽内部では1,3-ブタジエンとスチレンとの共重合反応が進行し、重合槽頭頂部の出口配管からは温度90℃のリビングポリマー溶液が排出された。このポリマー溶液に未反応のスチレン単量体や1,3-ブタジエン単量体が残存しないことはポリマー溶液のガスクロマトグラフィー測定によって確認された。共重合反応を120時間継続した後、原料のフィードを止めて重合槽内の溶液を全て抜出し、重合開始剤(n-ブチルリチウム)のフィード口の周辺部分を観察したが、ゲルの付着は確認されなかった。
(実施例5)
重合槽にフィードする単量体を1,3-ブタジエン、220g/分、スチレン、71g/分の混合物の代わりに、スチレン300g/分とした他は実施例1と同様にスチレンの重合体の製造を行った。重合槽頭頂部の出口配管から排出されたポリマー溶液に未反応のスチレン単量体が残存しないことはポリマー溶液のガスクロマトグラフィー測定によって確認された。重合反応を120時間継続した後、原料のフィードを止めて重合槽内の溶液を全て抜出し、重合開始剤(n-ブチルリチウム)のフィード口の周辺部分を観察したが、ゲルの付着は確認されなかった。
重合開始剤フィード用の配管の内径を21mmとした他は実施例1と同様に1,3-ブタジエンとスチレンとの共重合体の製造を行った。重合開始剤フィード用の配管出口(重合開始剤(n-ブチルリチウム)を含む溶液のフィード口の開口部)において、重合開始剤(n-ブチルリチウム)を含む溶液の線速度は0.079m/secであり、重合開始剤(n-ブチルリチウム)を含む溶液中の重合開始剤(n-ブチルリチウム)の濃度は0.02質量%であった。また、V/C=3.9であった。重合槽内部では1,3-ブタジエンとスチレンとの共重合反応が進行し、重合槽頭頂部の出口配管からは温度90℃のリビングポリマー溶液が排出された。このポリマー溶液に未反応のスチレン単量体や1,3-ブタジエン単量体が残存しないことはポリマー溶液のガスクロマトグラフィー測定によって確認された。共重合反応を120時間継続した後、原料のフィードを止めて重合槽内の溶液を全て抜出し、重合開始剤(n-ブチルリチウム)のフィード口の周辺部分を観察すると、ゲルの付着が確認された。
重合開例始剤フィード用の配管において、20質量%のn-ブチルリチウムを含むヘキサン溶液1.12g/分と、n-ヘキサン3,300cc/分とを配管内で混合した後、得られた混合溶液を重合槽底部から内径3.4mmの配管を通して重合槽にフィードした他は実施例1と同様に1,3-ブタジエンとスチレンとの共重合体の製造を行った。この時の配管出口(重合開始剤(n-ブチルリチウム)を含む溶液のフィード口の開口部)において、混合溶液の線速度は6.1m/secであり、混合溶液中のn-ブチルリチウムの濃度は0.01質量%であった。また、V/C=598であった。重合槽頭頂部の出口配管から得られるポリマー溶液には未反応のスチレン単量体、1,3-ブタジエン単量体が残存していることが、重合液のガスクロマトグラフィー分析により確認された。
Claims (3)
- 重合槽に共役ジエン化合物及び/又は芳香族ビニル化合物を含む単量体を連続的にフィードする工程(1)と、
重合槽に有機リチウム化合物を含む溶液を連続的にフィードする工程(2)と、
を含み、
前記工程(2)において、有機リチウム化合物を含む溶液のフィード口の開口部での線速度が0.1~5m/secである、重合体の製造方法。 - 前記単量体が少なくとも共役ジエン化合物を含む、請求項1に記載の重合体の製造方法。
- 前記重合槽にフィードされる前記有機リチウム化合物を含む溶液における有機リチウム化合物の濃度が0.01~1質量%である、請求項1又は2に記載の重合体の製造方法。
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