WO2018034310A1 - ゴム架橋物 - Google Patents
ゴム架橋物 Download PDFInfo
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- WO2018034310A1 WO2018034310A1 PCT/JP2017/029472 JP2017029472W WO2018034310A1 WO 2018034310 A1 WO2018034310 A1 WO 2018034310A1 JP 2017029472 W JP2017029472 W JP 2017029472W WO 2018034310 A1 WO2018034310 A1 WO 2018034310A1
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- opening polymer
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G61/00—Macromolecular compounds obtained by reactions forming a carbon-to-carbon link in the main chain of the macromolecule
- C08G61/02—Macromolecular compounds containing only carbon atoms in the main chain of the macromolecule, e.g. polyxylylenes
- C08G61/04—Macromolecular compounds containing only carbon atoms in the main chain of the macromolecule, e.g. polyxylylenes only aliphatic carbon atoms
- C08G61/06—Macromolecular compounds containing only carbon atoms in the main chain of the macromolecule, e.g. polyxylylenes only aliphatic carbon atoms prepared by ring-opening of carbocyclic compounds
- C08G61/08—Macromolecular compounds containing only carbon atoms in the main chain of the macromolecule, e.g. polyxylylenes only aliphatic carbon atoms prepared by ring-opening of carbocyclic compounds of carbocyclic compounds containing one or more carbon-to-carbon double bonds in the ring
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/24—Crosslinking, e.g. vulcanising, of macromolecules
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/04—Carbon
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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
- C08L65/00—Compositions of macromolecular compounds obtained by reactions forming a carbon-to-carbon link in the main chain; Compositions of derivatives of such 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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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2261/00—Macromolecular compounds obtained by reactions forming a carbon-to-carbon link in the main chain of the macromolecule
- C08G2261/10—Definition of the polymer structure
- C08G2261/12—Copolymers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2261/00—Macromolecular compounds obtained by reactions forming a carbon-to-carbon link in the main chain of the macromolecule
- C08G2261/10—Definition of the polymer structure
- C08G2261/16—End groups
- C08G2261/164—End groups comprising organic end groups
- C08G2261/1644—End groups comprising organic end groups comprising other functional groups, e.g. OH groups, NH groups, COOH groups or boronic acid
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2261/00—Macromolecular compounds obtained by reactions forming a carbon-to-carbon link in the main chain of the macromolecule
- C08G2261/30—Monomer units or repeat units incorporating structural elements in the main chain
- C08G2261/33—Monomer units or repeat units incorporating structural elements in the main chain incorporating non-aromatic structural elements in the main chain
- C08G2261/332—Monomer units or repeat units incorporating structural elements in the main chain incorporating non-aromatic structural elements in the main chain containing only carbon atoms
- C08G2261/3321—Monomer units or repeat units incorporating structural elements in the main chain incorporating non-aromatic structural elements in the main chain containing only carbon atoms derived from cyclopentene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2261/00—Macromolecular compounds obtained by reactions forming a carbon-to-carbon link in the main chain of the macromolecule
- C08G2261/70—Post-treatment
- C08G2261/76—Post-treatment crosslinking
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2380/00—Tyres
Definitions
- the present invention relates to a rubber cross-linked product obtained using a cyclopentene ring-opening polymer, and more specifically to a rubber cross-linked product excellent in ozone resistance obtained using a cyclopentene ring-opening polymer.
- butadiene rubber has been widely used as a rubber material for forming various rubber parts.
- Butadiene which is a raw material for butadiene rubber, is produced as a by-product in the production of ethylene by naphtha cracking, but in recent years, as a method for producing ethylene, methods using natural gas such as ethane as a raw material have been expanded. Therefore, a decrease in butadiene production is predicted. For this reason, various studies have been conducted on the use of synthetic rubber that does not use butadiene as an alternative material for butadiene rubber.
- Patent Document 1 discloses a rubber composition for a tire containing a cyclopentene ring-opening polymer, a solution-polymerized styrene butadiene rubber, and silica. According to the technique of Patent Document 1, although a rubber cross-linked product excellent in low heat build-up property can be provided, ozone resistance is not always sufficient, and therefore, it is suitable for tire applications requiring low heat build-up property. However, it is not necessarily suitable for applications requiring ozone resistance.
- the present invention has been made in view of such a situation, and an object thereof is to provide a rubber cross-linked product excellent in ozone resistance obtained by using a cyclopentene ring-opening polymer.
- the present inventors have found that a rubber obtained by crosslinking a polymer composition obtained by blending a predetermined amount of carbon black with a rubber component containing a cyclopentene ring-opening polymer.
- the present invention is completed by finding that the above-mentioned object can be achieved by a rubber cross-linked product in which the rate of change in tensile strength before and after the ozone treatment is controlled within a specific range when the ozone treatment is performed under specific conditions. It came to.
- a rubber cross-linked product obtained by cross-linking a polymer composition containing 20 to 200 parts by weight of carbon black with respect to 100 parts by weight of a rubber component containing a cyclopentene ring-opening polymer.
- the rate of change in tensile strength before and after ozone treatment was within ⁇ 70% when ozone treatment was held for 144 hours at an ozone concentration of 40 ° C. and 50 pphm with a tensile strain of 20%.
- a rubber cross-linked product is provided.
- the ratio of the repeating unit formed by ring-opening polymerization of cyclopentene in the cyclopentene ring-opening polymer is 80 mol% or more based on the total repeating units.
- the content ratio of the cyclopentene ring-opening polymer in the rubber component is 50% by weight or more with respect to 100% by weight of the total rubber component.
- the cyclopentene ring-opening polymer has a modifying group containing an atom selected from the group consisting of an atom of Group 15 of the periodic table, an atom of Group 16 of the periodic table, and a silicon atom.
- the modifying group is an oxysilyl group.
- the cyclopentene ring-opening polymer has the modifying group at the end of the polymer chain.
- the carbon black is furnace black.
- the rubber cross-linked product of the present invention is obtained by cross-linking a polymer composition containing 20 to 200 parts by weight of carbon black with respect to 100 parts by weight of a rubber component containing a cyclopentene ring-opening polymer.
- This is a rubber cross-linked product in which the rate of change in tensile strength before and after ozone treatment is within ⁇ 70% when ozone treatment is carried out for 144 hours in a state where 20% tensile strain is applied at an ozone concentration of .
- the rubber component used in the present invention contains a cyclopentene ring-opening polymer.
- the cyclopentene ring-opening polymer used in the present invention is a polymer containing a repeating unit formed by ring-opening polymerization of cyclopentene as a repeating unit constituting the main chain.
- the proportion of repeating units formed by ring-opening polymerization of cyclopentene is preferably 80 mol% or more, more preferably 90 mol% or more, more preferably 95 mol% with respect to all repeating units. % Or more, and it is particularly preferable that the polymer consists essentially of repeating units formed by ring-opening polymerization of cyclopentene.
- the cyclopentene ring-opening polymer may contain repeating units derived from other monomers copolymerizable with cyclopentene, and the proportion of repeating units derived from other monomers Is preferably 20 mol% or less, more preferably 10 mol% or less, still more preferably 5 mol% or less, based on all repeating units.
- Examples of other monomers copolymerizable with cyclopentene include monocyclic olefins other than cyclopentene, monocyclic dienes, monocyclic trienes and polycyclic cyclic olefins, polycyclic cyclic dienes, and polycyclic cyclic trienes. .
- Examples of monocyclic olefins other than cyclopentene include cyclopentene having a substituent and cyclooctene which may have a substituent.
- Examples of the monocyclic diene include 1,5-cyclooctadiene which may have a substituent.
- Examples of the monocyclic triene include 1,5,9-cyclododecatriene which may have a substituent.
- the polycyclic olefin, polycyclic diene, and polycyclic triene include 2-norbornene, dicyclopentadiene, 1,4-methano-1,4,4a, 9a-tetrahydro-9H-fluorene. , Tetracyclo [6.2.1.1 3,6 .
- Examples include norbornene compounds which may have a substituent such as 0 2,7 ] dodec-4-ene.
- the molecular weight of the cyclopentene ring-opening polymer is not particularly limited, but the polystyrene-converted weight average molecular weight (Mw) measured by gel permeation chromatography is 100,000 to 1,000,000. It is preferably 150,000 to 900,000, more preferably 200,000 to 800,000. When the cyclopentene ring-opening polymer has such a molecular weight, the mechanical properties of the rubber cross-linked product can be further improved.
- the ratio (Mw / Mn) of polystyrene-equivalent number average molecular weight (Mn) and weight average molecular weight (Mw) of the cyclopentene ring-opening polymer as measured by gel permeation chromatography is not particularly limited, but usually 4 0.0 or less, preferably 3.5 or less, and more preferably 3.0 or less. By having such Mw / Mn, the mechanical properties of the rubber cross-linked product can be further improved.
- the cis / trans ratio is not particularly limited, but is usually set in the range of 10/90 to 90/10.
- the cis / trans ratio is preferably in the range of 51/49 to 90/10, and more preferably in the range of 55/45 to 90/10. More preferred.
- the cis / trans ratio is preferably in the range of 10/90 to 49/51, and in the range of 10/90 to 45/55. More preferably.
- the method for adjusting the cis / trans ratio of the cyclopentene ring-opening polymer is not particularly limited.
- the glass transition temperature of the cyclopentene ring-opening polymer is not particularly limited, but is preferably ⁇ 90 ° C. or less, more preferably ⁇ 95 ° C. or less, and still more preferably from the viewpoint of exhibiting excellent characteristics at low temperatures. Is ⁇ 98 ° C. or lower.
- the glass transition temperature of the cyclopentene ring-opening polymer can be adjusted, for example, by adjusting the cis / trans ratio in the double bond present in the repeating unit.
- the cyclopentene ring-opening polymer may have a molecular structure consisting only of carbon atoms and hydrogen atoms, but from the viewpoint that it can be made more excellent in ozone resistance, carbon atoms are included in the molecular structure. And atoms other than hydrogen atoms, and more specifically, a modifying group containing an atom selected from the group consisting of an atom of Group 15 of the periodic table, an atom of Group 16 of the periodic table, and a silicon atom May be included.
- a modifying group containing an atom selected from the group consisting of a nitrogen atom, an oxygen atom, a phosphorus atom, a sulfur atom, and a silicon atom is preferable, and among these, a nitrogen atom, an oxygen atom And a modifying group containing an atom selected from the group consisting of silicon atoms is more preferred, and a modifying group containing a silicon atom is more preferred.
- Examples of the modifying group containing a nitrogen atom include an amino group, a pyridyl group, an imino group, an amide group, a nitro group, a urethane linking group, and a hydrocarbon group containing these groups.
- Examples of the modifying group containing an oxygen atom include a hydroxyl group, a carboxylic acid group, an ether group, an ester group, a carbonyl group, an aldehyde group, an epoxy group, or a hydrocarbon group containing these groups.
- Examples of the modifying group containing a silicon atom include an alkylsilyl group, an oxysilyl group, and a hydrocarbon group containing these groups.
- Examples of the modifying group containing a phosphorus atom include a phosphoric acid group, a phosphino group, and a hydrocarbon group containing these groups.
- Examples of the modifying group containing a sulfur atom include a sulfonyl group, a thiol group, a thioether group, or a hydrocarbon group containing these groups.
- the modifying group may be a modifying group containing a plurality of the groups described above.
- the particularly preferred modifying group from the viewpoint that it can be more excellent in ozone resistance include amino group, pyridyl group, imino group, amide group, hydroxyl group, carboxylic acid group, aldehyde Groups, epoxy groups, oxysilyl groups, or hydrocarbon groups containing these groups, and oxysilyl groups are particularly preferred.
- the oxysilyl group refers to a group having a silicon-oxygen bond.
- the oxysilyl group include an alkoxysilyl group, an aryloxysilyl group, an acyloxy group, an alkylsiloxysilyl group, an arylsiloxysilyl group, and a hydroxysilyl group.
- an alkoxysilyl group is preferable from the viewpoint of high introduction effect.
- the alkoxysilyl group is a group in which one or more alkoxy groups are bonded to a silicon atom. Specific examples thereof include a trimethoxysilyl group, a (dimethoxy) (methyl) silyl group, and a (methoxy) (dimethyl) silyl group. Group, triethoxysilyl group, (diethoxy) (methyl) silyl group, (ethoxy) (dimethyl) silyl group, (dimethoxy) (ethoxy) silyl group, (methoxy) (diethoxy) silyl group, tripropoxysilyl group, tributoxy A silyl group etc. are mentioned.
- An aryloxysilyl group is a group in which one or more aryloxy groups are bonded to a silicon atom, and specific examples thereof include a triphenoxysilyl group, (diphenoxy) (methyl) silyl group, and (phenoxy) (dimethyl).
- a silyl group, (diphenoxy) (ethoxy) silyl group, (phenoxy) (diethoxy) silyl group, etc. are mentioned. Of these, the (diphenoxy) (ethoxy) silyl group and the (phenoxy) (diethoxy) silyl group also have an alkoxy group in addition to the aryloxy group, and therefore are classified as an alkoxysilyl group.
- An acyloxysilyl group is a group in which one or more acyloxy groups are bonded to a silicon atom. Specific examples thereof include triacyloxysilyl groups, (diasiloxy) (methyl) silyl groups, and (acyloxy) (dimethyl). A silyl group etc. are mentioned.
- the alkylsiloxysilyl group is a group in which one or more alkylsiloxy groups are bonded to a silicon atom. Specific examples thereof include tris (trimethylsiloxy) silyl group, trimethylsiloxy (dimethyl) silyl group, triethylsiloxy ( And diethyl) silyl group and tris (dimethylsiloxy) silyl group.
- the arylsiloxysilyl group is a group in which one or more arylsiloxy groups are bonded to a silicon atom. Specific examples thereof include tris (triphenylsiloxy) silyl group, triphenylsiloxy (dimethyl) silyl group, tris And (diphenylsiloxy) silyl group.
- the hydroxysilyl group is a group in which one or more hydroxy groups are bonded to a silicon atom. Specific examples thereof include a trihydroxysilyl group, a (dihydroxy) (methyl) silyl group, and a (hydroxy) (dimethyl) silyl group. , (Dihydroxy) (ethoxy) silyl group, (hydroxy) (diethoxy) silyl group, and the like. Of these, the (dihydroxy) (ethoxy) silyl group and the (hydroxy) (diethoxy) silyl group also have an alkoxy group in addition to the hydroxy group, and therefore are classified as an alkoxysilyl group.
- the introduction position of the modifying group is not particularly limited, but from the viewpoint of further enhancing the introduction effect, a modified group is present at the end of the polymer chain. It is preferable.
- the cyclopentene ring-opening polymer has a modifying group at the end of the polymer chain, even if the modifying group is introduced only at one polymer chain end (one end), both polymer chain ends ( A modification group may be introduced at both ends), or a mixture of these may be used. Furthermore, these may be mixed with an unmodified cyclopentene ring-opened polymer in which a specific modifying group is not introduced at the end of the polymer chain.
- the introduction ratio of the modifying group at the polymer chain end of the cyclopentene ring-opening polymer is not particularly limited, but the modifying group has been introduced.
- the percentage value of the number of cyclopentene ring-opening polymer chain ends / number of cyclopentene ring-opening polymer chains is preferably 60% or more, more preferably 80% or more, and still more preferably 100% or more.
- the higher the introduction ratio of the modifying group the better the ozone resistance.
- the method for measuring the introduction ratio of the modifying group to the end of the polymer chain is not particularly limited. For example, the peak area ratio corresponding to the modifying group determined by 1 H-NMR spectrum measurement and the gel permeation chromatography It can be determined from the number average molecular weight determined from
- the method for synthesizing the cyclopentene ring-opening polymer is not particularly limited as long as the target polymer can be obtained, and may be synthesized according to a conventional method. For example, it can be synthesized by the method described below.
- the cyclopentene ring-opening polymer is obtained by, for example, reacting cyclopentene in the presence of a polymerization catalyst containing a group 6 transition metal compound (A) in the periodic table and an organoaluminum compound (B) represented by the following general formula (1). It can be obtained by ring-opening polymerization.
- R 1 3-x Al (OR 2 ) x (1)
- R 1 and R 2 represent a hydrocarbon group having 1 to 20 carbon atoms, and x is 0 ⁇ x ⁇ 3.
- the periodic table group 6 transition metal compound (A) is a compound having a periodic table (long period type periodic table, hereinafter the same) group 6 transition metal atom, specifically, a chromium atom, a molybdenum atom, or a tungsten atom.
- a compound having a molybdenum atom or a compound having a tungsten atom is preferable, and a compound having a tungsten atom is more preferable from the viewpoint of high solubility in cyclopentene.
- the group 6 transition metal compound (A) in the periodic table is not particularly limited as long as it is a compound having a group 6 transition metal atom in the periodic table.
- Group 6 transition metal compound (A) include molybdenum compounds such as molybdenum pentachloride, molybdenum oxotetrachloride, and molybdenum (phenylimide) tetrachloride; tungsten hexachloride, tungsten oxotetrachloride, Tungsten compounds such as tungsten (phenylimido) tetrachloride, monocatecholate tungsten tetrachloride, bis (3,5-ditertiarybutyl) catecholate tungsten dichloride, bis (2-chloroetherate) tetrachloride, tungsten oxotetraphenolate And so on.
- molybdenum compounds such as molybdenum pentachloride, molybdenum oxotetrachloride, and molybdenum (phenylimide) tetrachloride
- tungsten hexachloride tungs
- the amount of the group 6 transition metal compound (A) used in the periodic table is usually 1: 100 to 1: 200,000, preferably 1: in the molar ratio of “Group 6 transition metal atom in the polymerization catalyst: cyclopentene”.
- the range is 200 to 1: 150,000, more preferably 1: 500 to 1: 100,000.
- a polymerization reaction may not fully advance.
- the amount is too large, removal of the catalyst residue from the cyclopentene ring-opening polymer becomes difficult, and various properties of the resulting rubber cross-linked product may be deteriorated.
- the organoaluminum compound (B) is a compound represented by the general formula (1).
- Specific examples of the hydrocarbon group having 1 to 20 carbon atoms represented by R 1 and R 2 in the general formula (1) include a methyl group, an ethyl group, an isopropyl group, an n-propyl group, an isobutyl group, and an n-butyl group.
- Group, alkyl group such as t-butyl group, n-hexyl group and cyclohexyl group; aryl group such as phenyl group, 4-methylphenyl group, 2,6-dimethylphenyl group, 2,6-diisopropylphenyl group and naphthyl group And so on.
- the groups represented by R 1 and R 2 may be the same or different, but the cis ratio of the resulting cyclopentene ring-opening polymer is From the viewpoint that it can be controlled within the above-mentioned preferred range, at least R 2 out of R 1 and R 2 is preferably an alkyl group in which 4 or more carbon atoms are continuously bonded.
- a butyl group, 2-methyl-pentyl group, n-hexyl group, cyclohexyl group, n-octyl group, or n-decyl group is more preferable.
- x is 0 ⁇ x ⁇ 3. That is, in the general formula (1), the composition ratio between R 1 and OR 2 can take any value in each range of 0 ⁇ 3-x ⁇ 3 and 0 ⁇ x ⁇ 3, respectively. From the viewpoint that the polymerization activity can be increased and the cis ratio of the resulting cyclopentene ring-opening polymer can be controlled within the above-mentioned preferred range, x is preferably 0.5 ⁇ x ⁇ 1.5.
- the organoaluminum compound (B) represented by the general formula (1) can be synthesized, for example, by a reaction between a trialkylaluminum and an alcohol as shown in the following general formula (2).
- x in the general formula (1) can be arbitrarily controlled by defining the reaction ratio of the corresponding trialkylaluminum and alcohol as shown in the general formula (2).
- an organoaluminum compound (B) changes also with kinds of the organoaluminum compound (B) to be used, with respect to the periodic table group 6 transition metal atom which comprises a periodic table group 6 transition metal compound (A).
- the ratio is preferably 0.1 to 100 times mol, more preferably 0.2 to 50 times mol, and still more preferably 0.5 to 20 times mol. If the amount of the organoaluminum compound (B) used is too small, the polymerization activity may be insufficient, and if it is too large, side reactions tend to occur during ring-opening polymerization.
- the ring-opening polymerization reaction may be performed in the absence of a solvent or in a solution.
- the solvent used when the ring-opening polymerization reaction is performed in a solution is not particularly limited as long as it is inert in the polymerization reaction and can be dissolved in cyclopentene used in the ring-opening polymerization or the above-described polymerization catalyst. Examples thereof include hydrocarbon solvents and halogen solvents.
- hydrocarbon solvent examples include, for example, aromatic hydrocarbons such as benzene, toluene, xylene, and ethylbenzene; aliphatic hydrocarbons such as n-hexane, n-heptane, and n-octane; cyclohexane, cyclopentane, and methyl And alicyclic hydrocarbons such as cyclohexane.
- halogen-based solvent include alkyl halogens such as dichloromethane and chloroform; aromatic halogens such as chlorobenzene and dichlorobenzene.
- a modified group-containing olefinic unsaturated compound having the above-described modifying group and having one olefinic carbon-carbon double bond having metathesis reactivity can be introduced at the end of the polymer chain of the cyclopentene ring-opening polymer.
- a modifying group can be introduced at the end of the polymer chain of the cyclopentene ring-opening polymer.
- an oxysilyl group is introduced into the polymer chain end of a cyclopentene ring-opening polymer
- an oxysilyl group-containing olefinically unsaturated hydrocarbon may be present in the polymerization reaction system.
- Examples of such oxysilyl group-containing olefinically unsaturated hydrocarbons include vinyl (trimethoxy) silane, which introduces a modifying group only at one end (one end) of the polymer chain of the cyclopentene ring-opening polymer, Vinyl (triethoxy) silane, allyl (trimethoxy) silane, allyl (methoxy) (dimethyl) silane, allyl (triethoxy) silane, allyl (ethoxy) (dimethyl) silane, styryl (trimethoxy) silane, styryl (triethoxy) silane, 2- Alkoxysilane compounds such as styrylethyl (triethoxy) silane, allyl (triethoxysilylmethyl) ether, allyl (triethoxysilylmethyl) (ethyl) amine; vinyl (triphenoxy) silane, allyl (triphenoxy) silane, allyl (
- 1,4-bis (trimethoxysilyl) -2-butene, 1,4-bis (trimethylsilane) are introduced as modifying groups at both ends (both ends) of the polymer chain of the cyclopentene ring-opening polymer.
- Alkoxysilane compounds such as ethoxysilyl) -2-butene and 1,4-bis (trimethoxysilylmethoxy) -2-butene; aryloxysilane compounds such as 1,4-bis (triphenoxysilyl) -2-butene; Acyloxysilane compounds such as 1,4-bis (triacetoxysilyl) -2-butene; alkylsiloxysilane compounds such as 1,4-bis [tris (trimethylsiloxy) silyl] -2-butene; 1,4-bis [Arylsiloxysilane compounds such as [tris (triphenylsiloxy) silyl] -2-butene; 1,4-bis (heptamethyltrisiloxy) 2-butene, 1,4-bis polysiloxane compounds such as (undecapeptide methylcyclohexanol siloxy) -2-butene; and the like.
- the amount of the modified group-containing olefinically unsaturated hydrocarbon (C) such as oxysilyl group-containing olefinically unsaturated hydrocarbon may be appropriately selected according to the molecular weight of the cyclopentene ring-opening polymer to be produced, but is used for polymerization.
- the molar ratio with respect to cyclopentene is usually 1/100 to 1 / 100,000, preferably 1/200 to 1 / 50,000, more preferably 1/500 to 1 / 10,000.
- the modified group-containing olefinically unsaturated hydrocarbon (C) acts as a molecular weight regulator in addition to the action of introducing the modified group into the polymer chain end of the cyclopentene ring-opening polymer.
- 1-butene, 1-pentene, 1-butene is used as a molecular weight modifier in order to adjust the molecular weight of the resulting cyclopentene ring-opening polymer.
- Olefin compounds such as hexene and 1-octene, 1,4-pentadiene, 1,4-hexadiene, 1,5-hexadiene, 1,6-heptadiene, 2-methyl-1,4-pentadiene, 2,5-dimethyl-
- a diolefin compound such as 1,5-hexadiene may be used and added to the polymerization reaction system. What is necessary is just to select the usage-amount of a molecular weight modifier suitably from the range similar to the modification group containing olefinic unsaturated hydrocarbon (C) mentioned above.
- the polymerization reaction temperature is not particularly limited, but is preferably ⁇ 100 ° C. or higher, more preferably ⁇ 50 ° C. or higher, still more preferably ⁇ 20 ° C. or higher, and particularly preferably 0 ° C. or higher.
- the upper limit of the polymerization reaction temperature is not particularly limited, but is preferably less than 100 ° C, more preferably less than 90 ° C, still more preferably less than 80 ° C, and particularly preferably less than 70 ° C.
- the polymerization reaction time is not particularly limited, but is preferably 1 minute to 72 hours, more preferably 10 minutes to 20 hours.
- a ruthenium carbene complex is used as the polymerization catalyst. It is also possible to produce a cyclopentene ring-opening polymer by a method of ring-opening polymerization of cyclopentene in the presence of a ruthenium carbene complex.
- the ruthenium carbene complex is not particularly limited as long as it becomes a ring-opening polymerization catalyst for cyclopentene.
- Specific examples of the ruthenium carbene complex preferably used include bis (tricyclohexylphosphine) benzylidene ruthenium dichloride, bis (triphenylphosphine) -3,3-diphenylpropenylidene ruthenium dichloride, (3-phenyl-1H-indene-1 -Ylidene) bis (tricyclohexylphosphine) ruthenium dichloride, bis (tricyclohexylphosphine) t-butylvinylidene ruthenium dichloride, bis (1,3-diisopropylimidazoline-2-ylidene) benzylidene ruthenium dichloride, bis (1,3-dicyclohexyl imidazoline) -2-ylidene) benzylid
- the use amount of the ruthenium carbene complex is usually 1: 2,000 to 1: 2,000,000, preferably 1: 5,000 to 1: 1,500 in terms of a molar ratio of (metal ruthenium: cyclopentene in the catalyst). , 000, more preferably in the range of 1: 10,000 to 1: 1,000,000. If the amount of ruthenium carbene complex used is too small, the polymerization reaction may not proceed sufficiently. On the other hand, if the amount is too large, removal of the catalyst residue from the resulting cyclopentene ring-opening polymer becomes difficult, and various properties may be deteriorated when a rubber cross-linked product is obtained.
- the ring-opening polymerization reaction may be performed without a solvent or in a solution.
- a solvent used when the ring-opening polymerization reaction is performed in a solution a polymerization catalyst containing the above-described periodic table Group 6 transition metal compound (A) and the organoaluminum compound (B) represented by the general formula (1) is used. The thing similar to the case of using can be used.
- the polymerization reaction temperature and the polymerization reaction time are the same as in the case of using a polymerization catalyst containing the above-described periodic table Group 6 transition metal compound (A) and the organoaluminum compound (B) represented by the general formula (1). .
- a method using a polymerization catalyst containing the above-mentioned periodic table Group 6 transition metal compound (A) and the organoaluminum compound (B) represented by the general formula (1), or using a ruthenium carbene complex as the polymerization catalyst a polymerization catalyst containing the above-mentioned periodic table Group 6 transition metal compound (A) and the organoaluminum compound (B) represented by the general formula (1), or using a ruthenium carbene complex as the polymerization catalyst.
- an anti-aging agent such as a phenol-based stabilizer, a phosphorus-based stabilizer, or a sulfur-based stabilizer may be added to the cyclopentene ring-opening polymer obtained by the method. What is necessary is just to determine suitably the addition amount of an anti-aging agent according to the kind etc. Furthermore, you may mix
- a known recovery method may be employed to recover the polymer from the polymer solution, for example, after separating the solvent by steam stripping or the like. For example, a method of filtering a solid and further drying it to obtain a solid rubber can be employed.
- the rubber component used in the present invention may contain other rubber in addition to the cyclopentene ring-opening polymer.
- the rubber other than the cyclopentene ring-opening polymer include natural rubber (NR), polyisoprene rubber (IR), solution polymerization SBR (solution polymerization styrene butadiene rubber), emulsion polymerization SBR (emulsion polymerization styrene butadiene rubber), and low cis.
- BR polybutadiene rubber
- high cis BR high trans BR (trans bond content of butadiene portion 70 to 95%)
- styrene-isoprene copolymer rubber butadiene-isoprene copolymer rubber
- ethylene propylene diene rubber (EPDM) emulsification Polymerized styrene-acrylonitrile-butadiene copolymer rubber, acrylonitrile-butadiene copolymer rubber, polyisoprene-SBR block copolymer rubber, polystyrene-polybutadiene-polystyrene block copolymer, acrylic rubber, epichlorohydrin rubber, fluorine rubber Silicone rubber, ethylene - propylene rubber, and urethane rubber.
- NR, BR, IR, solution polymerization SBR, emulsion polymerization SBR, and EPDM are preferably used. These rubbers can be used alone or in combination
- the content of the cyclopentene ring-opening polymer is preferably 10% by weight or more, more preferably, based on the total rubber component from the viewpoint of making the effects of the present invention more remarkable. Is 50% by weight or more, more preferably 70% by weight or more.
- the content of rubber other than the cyclopentene ring-opening polymer is preferably 90% by weight or less, more preferably 50% by weight or less, still more preferably 30% by weight or less, based on the total rubber component. .
- the rubber component used in the present invention comprises only a cyclopentene ring-opening polymer (that is, 100% by weight of cyclopentene ring-opening polymer). May be used.
- the polymer composition used in the present invention is obtained by blending carbon black with a rubber component containing the above-described cyclopentene ring-opening polymer.
- Carbon black includes furnace black, acetylene black, thermal black, channel black, graphite and the like.
- furnace black is preferably used, and specific examples thereof include SAF, ISAF, ISAF-HS, ISAF-LS, IISAF-HS, HAF, HAF-HS, HAF-LS, MAF, and FEF. Can be mentioned. These may be used alone or in combination of two or more.
- Carbon black has a nitrogen adsorption specific surface area (N 2 SA) of preferably 5 to 200 m 2 / g, more preferably 20 to 150 m 2 / g, and a dibutyl phthalate (DBP) adsorption amount of preferably 5 to 200 ml. / 100 g, more preferably 50 to 160 ml / 100 g.
- N 2 SA nitrogen adsorption specific surface area
- DBP dibutyl phthalate
- the nitrogen adsorption specific surface area can be measured by the BET method in accordance with ASTM D-4820.
- the content of carbon black in the polymer composition used in the present invention is 20 to 200 parts by weight, preferably 25 to 150 parts by weight, with respect to 100 parts by weight of the rubber component containing the cyclopentene ring-opening polymer. More preferably, it is 30 to 100 parts by weight.
- the rubber cross-linked product of the present invention is obtained by cross-linking a polymer composition obtained by blending carbon black with a rubber component containing such a cyclopentene ring-opening polymer.
- the rate of change in tensile strength before and after the ozone treatment when treated is in the following range.
- the rubber cross-linked product of the present invention has a tensile strength S after ozone treatment when ozone treatment is carried out for 144 hours in an ozone concentration of 40 ° C. and 50 pphm with a tensile strain of 20%.
- the change rate ⁇ S (%) of the tensile strength before and after the ozone treatment determined according to the following formula is within ⁇ 70%, preferably ⁇ It is within 60%, more preferably within ⁇ 50%, and even more preferably within ⁇ 44%.
- the tensile strength change rate ⁇ S before and after the ozone treatment is determined by performing a tensile test with a dumbbell-shaped No. 1 shape in accordance with JIS K6251: 2010, thereby obtaining a tensile strength S 0 (MPa before the ozone treatment). ) And the tensile strength S 1 (MPa) after ozone treatment can be measured respectively and calculated according to the following formula.
- Rate of change of tensile strength before and after ozone treatment ⁇ S (%) ⁇ tensile strength after ozone treatment S 1 (MPa) ⁇ tensile strength before ozone treatment S 0 (MPa) ⁇ / tensile strength before ozone treatment S 0 (MPa ) ⁇ ⁇ 100
- the ozone treatment is preferably performed according to JIS K6259: 2004.
- the method for setting the change rate ⁇ S of the tensile strength before and after the ozone treatment is not particularly limited, but the carbon black content relative to the rubber component containing the cyclopentene ring-opening polymer in the polymer composition is not limited.
- the amount can be adjusted by a method of adjusting the amount within the above-described range.
- it can be adjusted by a method of modifying the cyclopentene ring-opening polymer.
- the polymer composition used in the present invention includes a crosslinking agent, a crosslinking accelerator, a crosslinking activator, an anti-aging agent, an activator, a process oil, a plasticizer, a wax, carbon, and the like according to a conventional method
- a crosslinking agent such as a filler other than black
- a necessary amount of a compounding agent such as a filler other than black can be blended.
- crosslinking agent examples include sulfur, sulfur halides, organic peroxides, quinonedioximes, organic polyvalent amine compounds, zinc acrylates, and alkylphenol resins having a methylol group. Of these, sulfur is preferably used.
- the amount of the crosslinking agent is preferably 0.5 to 5 parts by weight, more preferably 0.7 to 4 parts by weight, and further preferably 1 to 3 parts by weight with respect to 100 parts by weight of the rubber component in the polymer composition. Part.
- crosslinking accelerator examples include N-cyclohexyl-2-benzothiazolylsulfenamide, Nt-butyl-2-benzothiazolylsulfenamide, N-oxyethylene-2-benzothiazolylsulfenamide, Sulfenamide-based crosslinking accelerators such as N-oxyethylene-2-benzothiazolylsulfenamide and N, N′-diisopropyl-2-benzothiazolylsulfenamide; 1,3-diphenylguanidine, 1,3- Guanidine-based cross-linking accelerators such as dioltotolylguanidine and 1-ortho-tolylbiguanidine; thiourea-based cross-linking accelerators; thiazole-based cross-linking accelerators; thiuram-based cross-linking accelerators; dithiocarbamic acid-based cross-linking accelerators; And so on.
- crosslinking accelerators are used alone or in combination of two or more.
- the amount of the crosslinking accelerator is preferably 0.1 to 15 parts by weight, more preferably 0.5 to 5 parts by weight with respect to 100 parts by weight of the rubber component in the polymer composition.
- the crosslinking activator examples include higher fatty acids such as stearic acid and zinc oxide.
- the blending amount of the crosslinking activator is not particularly limited, but the blending amount when a higher fatty acid is used as the crosslinking activator is preferably 0.05 to 100 parts by weight with respect to 100 parts by weight of the rubber component in the polymer composition. 15 parts by weight, more preferably 0.5 to 5 parts by weight.
- zinc oxide is used as the crosslinking activator, the amount is preferably 0 with respect to 100 parts by weight of the rubber component in the polymer composition. .05 to 15 parts by weight, more preferably 0.5 to 5 parts by weight.
- Mineral oil or synthetic oil may be used as the process oil.
- mineral oil aroma oil, naphthenic oil, paraffin oil and the like are usually used.
- fillers other than carbon black include metal powder such as aluminum powder; inorganic powder such as hard clay, talc, calcium carbonate, titanium oxide, calcium sulfate, calcium carbonate, and aluminum hydroxide; organic such as starch and polystyrene powder. Examples thereof include powders such as powders; short fibers such as glass fibers (milled fibers), carbon fibers, aramid fibers, potassium titanate whiskers; silica, mica; These fillers are used alone or in combination of two or more.
- the method for obtaining the polymer composition used in the present invention is not particularly limited, and each component may be kneaded according to a conventional method.
- a compounding agent such as carbon black excluding a crosslinking agent and a crosslinking accelerator is mentioned.
- a rubber component such as a cycloolefin ring-opening polymer are kneaded, and then the kneaded product is mixed with a crosslinking agent and a crosslinking accelerator to obtain a desired composition.
- the kneading temperature of the compounding agent excluding the crosslinking agent and the crosslinking accelerator and the rubber component is preferably 70 to 200 ° C., more preferably 100 to 180 ° C.
- the kneading time is preferably 30 seconds to 30 minutes.
- Mixing of the kneaded product with the crosslinking agent and crosslinking accelerator is usually performed after cooling to 100 ° C. or lower, preferably 80 ° C. or lower.
- the rubber cross-linked product of the present invention can be obtained by cross-linking the polymer composition described above.
- the crosslinking method is not particularly limited, and may be selected according to the shape and size of the rubber crosslinked product.
- the mold may be filled with the polymer composition and heated to crosslink at the same time as molding, or the previously molded polymer composition may be heated to crosslink.
- the crosslinking temperature is preferably 120 to 200 ° C., more preferably 140 to 180 ° C., and the crosslinking time is usually about 1 to 120 minutes.
- a heating method a general method used for crosslinking of rubber such as press heating, steam heating, oven heating, hot air heating, etc. may be appropriately selected.
- the rubber cross-linked product of the present invention is excellent in ozone resistance, it can be suitably used for applications requiring ozone resistance.
- Sealing materials used in various fields such as aerospace, marine fields, antifungal agents used in the marine field, strength-imparting agents for adhesives and adhesives, ozonated water sealing materials such as ozonated water packing can be suitably used for various applications.
- Glass transition temperature (Tg) of cyclopentene ring-opening polymer Using a differential scanning calorimeter (DSC, Hitachi High-Tech Science Co., Ltd. X-DSC7000), the temperature was measured from ⁇ 150 ° C. to + 40 ° C. at a temperature increase of 10 ° C./min.
- a dumbbell-shaped No. 1 test piece was obtained in the same manner as in the tensile test.
- an ozone generator product name “Ozone Weather Meter OMS-HN”, manufactured by Suga Test Instruments Co., Ltd.
- the ozone treatment was carried out by holding for 144 hours in an environment with an ozone concentration of 50 pphm and a tensile strain of 20%.
- the tensile test is performed in the same manner as the above tensile test, the tensile strength of the test piece after the ozone treatment is measured, and from the obtained measurement result, the ozone treatment before and after the ozone treatment according to the following formula
- the rate of change in tensile strength ⁇ S was determined. Note that the tensile strength change rate ⁇ S before and after the ozone treatment is more preferable as the absolute value is smaller, since the fluctuation due to the ozone treatment is smaller and it can be determined that the ozone resistance is excellent.
- Rate of change of tensile strength before and after ozone treatment ⁇ S (%) ⁇ tensile strength after ozone treatment S 1 (MPa) ⁇ tensile strength before ozone treatment S 0 (MPa) ⁇ / tensile strength before ozone treatment S 0 (MPa ) ⁇ ⁇ 100
- the oxysilyl group introduction rate was 143%.
- Terminal-modified butadiene rubber (a4) was obtained by vacuum drying for 24 hours.
- Example 1 In a Banbury mixer, 100 parts of the both-end-modified cyclopentene ring-opened polymer (a1) obtained in Synthesis Example 1 is masticated for 30 seconds, then 2 parts of stearic acid, 3 parts of zinc oxide, carbon black (trade name) “IRB # 8”, manufactured by CONTINENTAL CARBON, 60 parts of nitrogen adsorption specific surface area (BET method): 76.3 m 2 / g, furnace black), and process oil (manufactured by JX Nippon Mining & Energy Corporation, trade name “Allo” Max T-DAE ”) was added and kneaded at 110 ° C.
- Example 2 Implementation was performed except that 100 parts of the unmodified cyclopentene ring-opening polymer (a2) obtained in Synthesis Example 2 was used instead of 100 parts of the both-end-modified cyclopentene ring-opening polymer (a1) obtained in Synthesis Example 1. In the same manner as in Example 1, a polymer composition was obtained and evaluated in the same manner. The results are shown in Table 1.
- Example 3 Implementation was performed except that 100 parts of the unmodified cyclopentene ring-opening polymer (a3) obtained in Synthesis Example 3 was used in place of 100 parts of the both-end-modified cyclopentene ring-opening polymer (a1) obtained in Synthesis Example 1. In the same manner as in Example 1, a polymer composition was obtained and evaluated in the same manner. The results are shown in Table 1.
- Example 2 Example 1 except that 100 parts of the terminal-modified butadiene rubber (a4) obtained in Synthesis Example 4 was used instead of 100 parts of the both-end-modified cyclopentene ring-opening polymer (a1) obtained in Synthesis Example 1. Similarly, a polymer composition was obtained and evaluated in the same manner. The results are shown in Table 1.
- the predetermined rubber cross-linked product of the present invention obtained by cross-linking a polymer composition containing a cyclopentene ring-opening polymer and a predetermined amount of carbon black is The absolute value of the change rate ⁇ S of the tensile strength before and after the ozone treatment is suppressed to a smaller value than when the butadiene rubber is used instead of the ring polymer (Comparative Examples 1 and 2). It was also possible to suppress the ozone resistance.
- the predetermined rubber cross-linked product of the present invention obtained by cross-linking a polymer composition containing a cyclopentene ring-opening polymer and a predetermined amount of carbon black has a low compression set rate. It was also excellent in compression set resistance.
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Abstract
Description
好ましくは、前記ゴム成分中における、前記シクロペンテン開環重合体の含有割合が、全ゴム成分100重量%に対して、50重量%以上である。
好ましくは、前記シクロペンテン開環重合体が、周期表第15族の原子、周期表第16族の原子、およびケイ素原子からなる群から選ばれる原子を含有する変性基を有する。
好ましくは、前記変性基が、オキシシリル基である。
好ましくは、前記シクロペンテン開環重合体が、前記変性基を重合体鎖の末端に有する。
好ましくは、前記カーボンブラックが、ファーネスブラックである。
(R1)3-xAl(OR2)x (1)
(上記一般式(1)中、R1およびR2は、炭素数1~20の炭化水素基を表し、xは、0<x<3である。)
(R1)3Al + xR2OH → (R1)3-xAl(OR2)x + (R1)xH (2)
オゾン処理前後の引張強度の変化率ΔS(%)={オゾン処理後の引張強度S1(MPa)-オゾン処理前の引張強度S0(MPa)}/オゾン処理前の引張強度S0(MPa)}×100
また、オゾン処理は、JIS K6259:2004に準拠して行うことが好ましい。
ゲル・パーミエーション・クロマトグラフィー(GPC)システム HLC-8220(東ソー社製)により、HタイプカラムHZ-M(東ソー社製)二本を直列に連結して用い、テトラヒドロフランを溶媒として、カラム温度40℃で測定した。検出器は示差屈折計RI-8320(東ソー社製)を用いた。シクロペンテン開環重合体、およびブタジエンゴムの重量平均分子量(Mw)、数平均分子量(Mn)は、ポリスチレン換算値として測定した。
示差走査型熱量計(DSC,日立ハイテクサイエンス社製X-DSC7000)を用いて、-150℃~+40℃までを10℃/分の昇温で測定した。
13C-NMRスペクトル測定により決定した。
1H-NMRスペクトル測定により、オキシシリル基に由来するピーク積分値と末端変性シクロペンテン開環重合体主鎖中の炭素-炭素二重結合に由来するピーク積分値との比率を求め、このピーク積分値の比率とGPCによる数平均分子量(Mn)の測定値に基づいて、オキシシリル基の導入率〔(オキシシリル基が導入されたシクロペンテン開環重合体鎖末端数/末端変性シクロペンテン開環重合体鎖数)の百分率〕を計算した。
試料となる重合体組成物を、150℃で25分間プレス架橋することでゴム架橋物シートを作製し、得られたゴム架橋物シートを、列理方向に対して平行方向に、ダンベル状1号形に打ち抜くことで、ダンベル状試験片を得た。そして、得られたダンベル状1号形試験片について、試験機として引張試験機(製品名「TENSOMETER10K」、ALPHA TECHNOLOGIES社製、ロードセル式 1kN)を使用し、JIS K6251:2010に準拠して、23℃、500mm/分の条件にて、引張試験を行い、引張強度を測定した。
上記引張試験と同様にして、ダンベル状1号形試験片を得た。そして、ダンベル状1号形試験片について、試験機としてオゾン発生機(製品名「オゾンウェザーメータ OMS-HN」、スガ試験機社製)を使用し、JIS K6259:2004に準拠して、40℃、オゾン濃度50pphm、引張ひずみ20%の環境下に、144時間保持することで、オゾン処理を行った。そして、オゾン処理後の試験片について、上記引張試験と同様にして引張試験を行い、オゾン処理後の試験片の引張強度を測定し、得られた測定結果から、下記式にしたがってオゾン処理前後の引張強度の変化率ΔSを求めた。なお、オゾン処理前後の引張強度の変化率ΔSは、絶対値が小さいほど、オゾン処理による変動が小さく、耐オゾン性に優れると判断できるため、好ましい。
オゾン処理前後の引張強度の変化率ΔS(%)={オゾン処理後の引張強度S1(MPa)-オゾン処理前の引張強度S0(MPa)}/オゾン処理前の引張強度S0(MPa)}×100
上記引張試験と同様にして、ダンベル状1号形試験片を得た。そして、ダンベル状1号形試験片について、試験機としてオゾン発生機(製品名「オゾンウェザーメータ OMS-HN」、スガ試験機社製)を使用し、JIS K6259:2004に準拠して、40℃、オゾン濃度50pphm、引張ひずみ20%の環境下に、所定時間(24時間、48時間、72時間、96時間、144時間)保持することでオゾン処理を行い、き裂状態観察法により、試験片のき裂の大きさを観察した。
なお、試験片のき列の大きさについては、以下の基準で評価した。
1.肉眼ではき列が見えないが、10倍の拡大鏡ではき列が確認できるもの。
2.き列が肉眼で確認できるもの。
3.き裂が深くて比較的大きいもの(1mm未満)。
4.き裂が深くて大きいもの(1mm以上3mm 未満)。
5.3mm以上のき裂がある又は切断を起こしそうなもの。
重合体組成物を、金型を用いて、加圧しながら150℃で30分間プレス成形して、直径29mm、厚さ12.5mmの円柱状のゴム架橋物を得た。そして、得られた円柱状のゴム架橋物を用いて、円柱状のゴム架橋物を挟んだ二つの平面間の距離をディスク厚み方向に25%圧縮した状態で、ギヤー老化試験機(製品名「AG-1110」、上島製作所社製)にて、100℃にて72時間保持する条件でJIS K6262:2013に従い、圧縮永久歪み率を測定した。
ジイソブチルアルミニウムモノ(n-へキソキシド)/トルエン溶液(2.5重量%)の調製
窒素雰囲気下、攪拌子の入ったガラス容器に、トルエン88部、および25.4重量%のトリイソブチルアルミニウム/n-ヘキサン溶液(東ソー・ファインケム社製)7.8部を加えた。次いで、容器を-45℃に冷却し、激しく攪拌しながら、n-ヘキサノール1.02部(トリイソブチルアルミニウムに対して当モル量)をゆっくりと滴下した。その後、攪拌しながら室温になるまで放置し、ジイソブチルアルミニウムモノ(n-へキソキシド)/トルエン溶液(2.5重量%)を調製した。
窒素雰囲気下、攪拌子の入ったガラス容器に、1.0重量%のWCl6/トルエン溶液87部、および参考例1で調製した2.5重量%のジイソブチルアルミニウムモノ(n-ヘキソキシド)/トルエン溶液43部を加え、15分間攪拌することにより、触媒溶液を得た。そして、窒素雰囲気下、攪拌機付き耐圧ガラス反応容器に、シクロペンテン300部および1,4-ビス(トリエトキシシリル)-2-ブテン1.24部を加え、ここに、上記にて調製した触媒溶液130部を加えて、25℃で4時間重合反応を行った。4時間の重合反応後、耐圧ガラス反応容器に、過剰のエチルアルコールを加えて重合を停止した後、老化防止剤として、イルガノックス1520L(チバスペシャリティーケミカルズ社製)を、重合により得られた重合体100部に対して0.2部添加した。次いで、多量のエタノールで凝固して重合体を回収し、40℃で3日間、真空乾燥することにより、両末端にトリエトキシシリルが導入された、両末端変性シクロペンテン開環重合体(a1)78部を得た。得られた両末端変性シクロペンテン開環重合体(a1)の重量平均分子量(Mw)は366,000、ガラス転移温度(Tg)は-106℃、シス/トランス比は、シス/トランス=55/45であり、オキシシリル基導入率は143%であった。
窒素雰囲気下、攪拌子の入ったガラス容器に、1.0重量%のWCl6/トルエン溶液87部、および参考例1で調製した2.5重量%のジイソブチルアルミニウムモノ(n-ヘキソキシド)/トルエン溶液43部を加え、15分間攪拌することにより、触媒溶液を得た。そして、窒素雰囲気下、攪拌機付き耐圧ガラス反応容器に、シクロペンテン300部および1-ヘキセン0.26部を加え、ここに、上記にて調製した触媒溶液130部を加えて、0℃で4時間重合反応を行った。4時間の重合反応後、耐圧ガラス反応容器に、過剰のエチルアルコールを加えて重合を停止した後、老化防止剤として、イルガノックス1520L(チバスペシャリティーケミカルズ社製)を、重合により得られた重合体100部に対して0.2部添加した。次いで、多量のエタノールで凝固して重合体を回収し、40℃で3日間、真空乾燥することにより、未変性のシクロペンテン開環重合体(a2)74部を得た。得られた未変性シクロペンテン開環重合体(a2)の重量平均分子量(Mw)は389,000、ガラス転移温度(Tg)は-110℃、シス/トランス比は、シス/トランス=81/19であった。
窒素雰囲気下、磁気攪拌子を入れた耐圧ガラス反応容器に、シクロペンテン1000部、1-ヘキセン0.42部、およびトルエン990部を加えた。次に、トルエン10部に溶解した(3-フェニル-1H-インデン-1-イリデン)ビス(トリシクロヘキシルホスフィン)ルテニウムジクロリド0.068部を加え、室温で3時間重合した。3時間の重合反応後、耐圧ガラス反応容器に、過剰のビニルエチルエーテルを加えて重合を停止した後、老化防止剤として、イルガノックス1520L(チバスペシャリティーケミカルズ社製)を、重合により得られた重合体100部に対して0.2部添加した。次いで、多量のエタノールで凝固して重合体を回収し、50℃で24時間真空乾燥することにより、未変性のシクロペンテン開環重合体(a3)650部を得た。得られた未変性シクロペンテン開環重合体(a3)の重量平均分子量は(Mw)は434,000、ガラス転移温度(Tg)は-98℃、シス/トランス比は、シス/トランス=17/83であった。
攪拌機付きオートクレーブに、窒素雰囲気下、シクロヘキサン5670g、および1,3-ブタジエン700gを仕込んだ後、n-ブチルリチウムをシクロヘキサンと1,3-ブタジエンとに含まれる重合を阻害する不純物の中和に必要な量を添加し、さらに、n-ブチルリチウムを重合反応に用いる分として8.33mmolを加え、50℃で重合を開始した。重合を開始してから20分経過後、1,3-ブタジエン300gを30分間かけて連続的に添加した。重合反応中の最高温度は80℃であった。
連続添加終了後、さらに15分間重合反応を継続し、重合転化率が95%から100%の範囲になったことを確認してから、重合溶液に、1,6-ビス(トリクロロシリル)ヘキサン0.333mmol(重合に使用したn-ブチルリチウムの0.04倍モルに相当)を40重量%シクロヘキサン溶液の状態で添加し、30分間反応させた。さらに、その後、下記式(3)で表されるポリオルガノシロキサン2.92mmol(重合に使用したn-ブチルリチウムの0.35倍モルに相当)を20重量%キシレン溶液の状態で添加し、30分間反応させ、次いでテトラメトキシシランを8.33mmol(重合に使用したn-ブチルリチウムの1倍モルに相当)を25重量%シクロヘキサン溶液の状態で添加し、30分間反応させた。その後、重合停止剤として、使用したn-ブチルリチウムの2倍モルに相当する量のメタノールを添加して、末端変性ポリブタジエン(a4)を含有する溶液を得た。そして、得られた溶液に、ゴム成分100部あたり、老化防止剤としてイルガノックス1520L(チバスペシャリティーケミカルズ社製)を0.2部添加し、スチームストリッピングにより溶媒を除去した後、60℃で24時間真空乾燥することにより、末端変性ブタジエンゴム(a4)を得た。得られた末端変性ブタジエンゴム(a4)の重量平均分子量は(Mw)は553,000、ビニル/シス/トランス比は、ビニル/シス/トランス=10/45/45であった。
バンバリー形ミキサー中で、合成例1で得られた両末端変性シクロペンテン開環重合体(a1)100部を30秒素練りし、次いで、ステアリン酸2部、酸化亜鉛3部、カーボンブラック(商品名「IRB#8」、CONTINENTAL CARBON社製、窒素吸着比表面積(BET法):76.3m2/g、ファーネスブラック)60部、および、プロセスオイル(JX日鉱日石エネルギー社製、商品名「アロマックスT-DAE」)15部を添加して、110℃にて、180秒混練した後、ラムの上部に残った配合剤をクリーニングした後、さらに150秒混練し、ミキサーから混練物を排出させた。次いで、混練物を、室温まで冷却した後、23℃のオープンロールで、得られた混練物と、硫黄1,5部、および、架橋促進剤としてのN-(tert-ブチル)-2-ベンゾチアゾリルスルフェンアミド(大内新興化学工業社製、商品名「ノクセラーNS-P」)0.9部とを混練した後、シート状の重合体組成物を得た。
合成例1で得られた両末端変性シクロペンテン開環重合体(a1)100部に代えて、合成例2で得られた未変性シクロペンテン開環重合体(a2)100部を使用した以外は、実施例1と同様にして、重合体組成物を得て、同様に評価を行った。結果を表1に示す。
合成例1で得られた両末端変性シクロペンテン開環重合体(a1)100部に代えて、合成例3で得られた未変性シクロペンテン開環重合体(a3)100部を使用した以外は、実施例1と同様にして、重合体組成物を得て、同様に評価を行った。結果を表1に示す。
合成例1で得られた両末端変性シクロペンテン開環重合体(a1)100部に代えて、未変性ブタジエンゴム(商品名「Nipol BR1220」、日本ゼオン社製、シス含有量97%以上)100部を使用した以外は、実施例1と同様にして、重合体組成物を得て、同様に評価を行った。結果を表1に示す。
合成例1で得られた両末端変性シクロペンテン開環重合体(a1)100部に代えて、合成例4で得られた末端変性ブタジエンゴム(a4)100部を使用した以外は、実施例1と同様にして、重合体組成物を得て、同様に評価を行った。結果を表1に示す。
Claims (7)
- シクロペンテン開環重合体を含有するゴム成分100重量部に対して、20~200重量部のカーボンブラックを含有する重合体組成物を架橋してなるゴム架橋物であって、40℃、50pphmのオゾン濃度にて、20%の引張ひずみを与えた状態で、144時間保持するオゾン処理を行った際における、オゾン処理前後の引張強度の変化率が±70%以内となるゴム架橋物。
- 前記シクロペンテン開環重合体中における、シクロペンテンを開環重合してなる繰返し単位の割合が、全繰返し単位に対して80モル%以上である請求項1に記載のゴム架橋物。
- 前記ゴム成分中における、前記シクロペンテン開環重合体の含有割合が、全ゴム成分100重量%に対して、50重量%以上である請求項1または2に記載のゴム架橋物。
- 前記シクロペンテン開環重合体が、周期表第15族の原子、周期表第16族の原子、およびケイ素原子からなる群から選ばれる原子を含有する変性基を有する請求項1~3のいずれかに記載のゴム架橋物。
- 前記変性基が、オキシシリル基である請求項4に記載のゴム架橋物。
- 前記シクロペンテン開環重合体が、前記変性基を重合体鎖の末端に有する請求項4または5に記載のゴム架橋物。
- 前記カーボンブラックが、ファーネスブラックである請求項1~6のいずれかに記載のゴム架橋物。
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