WO2007077787A1 - サイドウォール用ゴム組成物 - Google Patents
サイドウォール用ゴム組成物 Download PDFInfo
- Publication number
- WO2007077787A1 WO2007077787A1 PCT/JP2006/325762 JP2006325762W WO2007077787A1 WO 2007077787 A1 WO2007077787 A1 WO 2007077787A1 JP 2006325762 W JP2006325762 W JP 2006325762W WO 2007077787 A1 WO2007077787 A1 WO 2007077787A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- rubber
- rubber composition
- weight
- sidewall
- spb
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L7/00—Compositions of natural rubber
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
Definitions
- the present invention relates to a rubber composition for a sidewall.
- JP-A-2005-75951 and JP-A-2005-247899 disclose a rubber thread and composition for tires containing a butadiene rubber in which syndiotactic 1,2-polybutadiene is dispersed. Since the average primary particle size of syndiotactic 1,2-polybutadiene in butadiene rubber is large and not sufficiently dispersed, the performance was not satisfactory.
- An object of the present invention is to provide a rubber composition for a side wall in which the balance between chip cut resistance and heat generation of the side wall is improved.
- the present invention syndiotactic 1 average primary particle size of less LOOnm, 2 poly butadiene butadiene rubber dispersed, rubber support Ido walls 10-60 0/0 contained in the rubber component Relates to the composition.
- the rubber composition for a sidewall of the present invention contains a rubber component, and the rubber component is a butadiene rubber (SPB-containing BR) in which syndiotactic 1,2-polybutadiene is dispersed.
- SPB-containing BR butadiene rubber
- SPB-containing BR syndiotactic 1, 2, 2-polybutadiene (SPB) is sufficiently finely dispersed in the matrix BR, and the average primary particle size of SPB in BR is very small Is.
- the average primary particle diameter of SPB in BR is lOOnm or less, preferably 80nm or less, more preferably 50nm or less. If the average primary particle size of SPB exceeds 10 Onm, the effect of sufficiently improving the physical properties due to the inclusion of SPB in BR cannot be obtained.
- the average primary particle diameter of SPB in BR was measured as an average value of absolute maximum lengths obtained by image analysis processing of transmission electron micrographs.
- SPB content The content of SPB in BR is preferably 7% by weight or more, more preferably 10% by weight or more. If the content is less than 7% by weight, there is a tendency that sufficient chip cut resistance cannot be obtained.
- the SPB content in the SPB-containing BR is preferably 20% by weight or less, more preferably 14% by weight or less. If the content exceeds 20% by weight, rubber kneading becomes difficult and sufficient chip-cut resistance tends to be not obtained.
- the SPB content in the SPB-containing BR is shown by the amount of boiling n xane insoluble matter.
- the SPB contained in the SPB-containing BR is preferably a crystal from the viewpoint of imparting reinforcing properties in the tire operating temperature region such as a normal temperature car.
- the SPB-containing BR production method that satisfies the above conditions is not particularly limited, but can be produced by the production method disclosed in JP-A-2005-247899.
- the content of SPB-containing BR (including SPB-free BR when used in combination) in the rubber component is 10% by weight or more, preferably 25% by weight That's it. When the content is less than 10% by weight, it is difficult to obtain sufficient bending fatigue resistance.
- the content of SPB-containing BR in the rubber component is 60 weight 0/0 or less, preferably 40 wt% or less. If the content exceeds 60% by weight, sufficient chip cut resistance cannot be obtained.
- the rubber composition for sidewalls preferably further contains natural rubber (NR) as a rubber component.
- NR natural rubber
- the content of NR in the rubber component is more preferably 30 weight 0/0 on than the preferred device 50 wt% or more. If the content is less than 30% by weight, there is a tendency that sufficient chip cut resistance cannot be obtained.
- a typical butadiene rubber or styrene butadiene rubber may be blended together.
- the rubber composition for a sidewall contains carbon black as a reinforcing filler together with the rubber component.
- N SA nitrogen adsorption specific surface area
- the rubber composition for a sidewall of the present invention By using the rubber composition for a sidewall of the present invention, it is possible to maintain the hardness while reducing the amount of carbon black, and even if the carbon black content is low, the resistance required for the rubber composition for the sidewall is required. It is possible to maintain or improve flexural fatigue, low heat build-up, and fracture strength.
- the content of carbon black may be 20 to 45 parts by weight with respect to 100 parts by weight of the rubber component, and may be less than the compounding amount in the conventional rubber composition for sidewalls.
- the content is less than 20 parts by weight, there is a tendency that sufficient chip cut resistance cannot be obtained.
- the content exceeds 45 parts by weight, the low heat build-up tends to be impaired.
- Specific examples of the adhesive resin include aliphatic (C) petroleum rosin and aromatic (C) stones.
- Oils and fats are preferred, alicyclic petroleum oils, terpene resin and rosin oils are preferred, and aliphatic (C) petroleum resins are particularly preferred.
- the soft spot of the adhesive resin is preferably 90 to 130 ° C. If the softening point is less than 90 ° C, the low heat generation tends to be impaired. On the other hand, when the soft saddle point exceeds 130 ° C, the dispersibility during rubber kneading becomes difficult and the chip cut resistance tends to decrease.
- the amount of the adhesive resin is preferably 1 to 5 parts by weight per 100 parts by weight of the rubber component. If the blending amount is less than 1 part by weight, sufficient tackiness tends not to be obtained. Further, if the amount exceeds 6 parts by weight, the low heat build-up tends to be impaired.
- the rubber composition for sidewalls includes reinforcing fillers such as silica generally used in the rubber industry, stearic acid, anti-aging agent, wax, zinc oxide, vulcanizing agent, Vulcanization accelerators can be blended.
- reinforcing fillers such as silica generally used in the rubber industry, stearic acid, anti-aging agent, wax, zinc oxide, vulcanizing agent, Vulcanization accelerators can be blended.
- the rubber composition for a sidewall is used for manufacturing a tire by an ordinary method.
- an unvulcanized rubber composition obtained by kneading rubber components and reinforcing fillers is extruded according to the shape of the side wall, and then bonded to other tire members.
- a tire can be manufactured by forming an unvulcanized tire on a tire molding machine and further vulcanizing the unvulcanized tire in a vulcanizer.
- Specific examples of the tire include passenger car tires, heavy duty tires such as buses and trucks, and the like, and particularly preferably used for heavy duty tires.
- VCR412 Ube Industries, Ltd. (syndiotactic 1 dispersed, 2 BR having a polybutadiene crystal, syndiotactic 1, 2-polybutadiene content: 12 wt 0/0, the average of the syndiotactic 1, 2 polybutadiene crystal (Primary particle size: 250nm)
- VCR Prototype Prototype manufactured by Ube Industries, Ltd. (BR with dispersed syndiotactic 1,2-polybutadiene crystals, syndiotactic 1,2-polybutadiene content: 12% by weight, syndiotactic 1, 2 Average primary particle diameter of polybutadiene crystal: 43nm)
- CB N330 Carbon black N330 manufactured by Mitsubishi Chemical Corporation (N SA: 80mVg)
- Zinc oxide Toho Zinc Co., Ltd.
- Stearic acid manufactured by Nippon Oil & Fat Co., Ltd.
- Anti-aging agent 6C manufactured by Seige Chemical Co., Ltd.
- Wax Ozoace wax manufactured by Nippon Seisen Co., Ltd.
- Adhesive resin Escorez 1102 manufactured by Exxon Chemical (C5 series resin, softening point: 97-103 ° C)
- Powdered sulfur manufactured by Tsurumi Chemical Co., Ltd.
- Accelerator NS TBBS manufactured by Ouchi Shinsei Chemical Co., Ltd.
- the average primary particle size of the VCR412 and VCR prototypes was measured as an average value of absolute maximum lengths obtained by image analysis processing of transmission electron microscope photographs.
- N SA nitrogen adsorption specific surface area
- the measurement was performed according to the method for obtaining the specific surface area of the deposition method.
- a mixture of C 4 fraction containing 32% by weight of 1,3-butadiene and cis-2-butene as the main component at a concentration of 68% by weight and dissolving the specified water (water: 2. O9mmol / L) was supplied to 12.5 L / hr (containing 20 mgZL of disulfurized carbon and 20 mg ZL) at a temperature of 20 ° C and a 2 L stainless steel aging tank with a stirrer, and jetyl aluminum chloride (10 wt% n- Hexane solution, 3.13 mmol ZL) is fed, and the molar ratio of dimethylaluminum chloride Z water in this reactor solution is adjusted to 1.5.
- the resulting ripening solution is supplied to a stainless cis polymerization tank with a stirrer having a capacity of 5 L maintained at 40 ° C.
- This cis polymerization tank contains cobalt octoate (cobalt octoate 0.0117mmolZL, n-hexane solution) and molecular weight regulator 1,2-butadiene (1,2-butadiene 8.2mmolZL, 1.535mo 1ZL). n-hexane solution).
- the obtained cis polymerization liquid was supplied to a 5 L stainless steel 1,2-polybutadiene polymerization tank equipped with a ribbon stirrer and continuously polymerized at 35 ° C for 10 hours.
- This 1,2-polybutadiene polymerization tank was continuously fed with triethylaluminum (10 wt% 11-hexane solution, 4.09 mmol ZL).
- the obtained polymerization solution was supplied to a mixing vessel equipped with a stirrer, and 1 part by weight of 2,6-di-t-butyl-p-talezole was added to 100 parts by weight of rubber, and methanol was added in a small amount. After the polymerization was stopped, the unreacted 1,3-butadiene and C4 fractions were removed by evaporation and vacuum dried at room temperature to obtain 8.3 kg of a VCR prototype.
- the obtained rubber sheet was molded into a sidewall shape, bonded to another tire part, and vulcanized at 150 ° C for 45 minutes to obtain each test tire (tire size 11R22.5). ) And used for the following measurement tests.
- the temperature is 70 by a viscoelastic spectrometer VES (manufactured by Iwamoto Seisakusho Co., Ltd.).
- VES viscoelastic spectrometer
- the loss tangent tan ⁇ of each formulation at a strain of 2% was measured under the conditions of C, initial strain of 10%, and frequency of 10 Hz. Then, loss tangent was expressed as an index using the following formula to evaluate heat generation. The higher the index, the better.
- Each test piece that had been cut out of the test tire force was subjected to air heat aging with a gear-oven tester at 80 ° C for 10 days, and then a tensile test according to JIS K6251 was conducted to determine the breaking strength (TB) of the test piece. And the elongation at break (EB) was measured. Then, the numerical value of the product of the obtained breaking strength and elongation at break (TB X EB) was calculated, and the product was indexed according to the following formula to evaluate the chip cut resistance. The higher the index, the better.
- the flaw After making a cut flaw with a width of 5 mm and a depth of 2 mm at the maximum strain position on the sidewall of the test tire, the flaw grew after running a 15000 km drum at a tire internal pressure of 850 kPa, a load of 37.5 kN, and a speed of 40 km / h. If not, it was accepted ( ⁇ ).
- Tables 1 and 2 show the measurement results.
- VCR prototype 10 20 30 40 50 distribution CB N330 40 35 30 25 20
- a specific amount of butadiene rubber having syndiotactic 1, 2 polybutadiene having a small average primary particle size is blended in a rubber composition for a sidewall, whereby the chip cut resistance and heat generation of the sidewall are increased.
- the balance of sex can be improved.
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Tires In General (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/087,333 US20090000720A1 (en) | 2006-01-06 | 2006-12-25 | Rubber Composition for Sidewall |
EP06843166A EP1970405A4 (en) | 2006-01-06 | 2006-12-25 | RUBBER COMPOSITION FOR SIDE WALL |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006-001703 | 2006-01-06 | ||
JP2006001703 | 2006-01-06 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2007077787A1 true WO2007077787A1 (ja) | 2007-07-12 |
Family
ID=38228142
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2006/325762 WO2007077787A1 (ja) | 2006-01-06 | 2006-12-25 | サイドウォール用ゴム組成物 |
Country Status (5)
Country | Link |
---|---|
US (1) | US20090000720A1 (ja) |
EP (1) | EP1970405A4 (ja) |
CN (1) | CN101351497A (ja) |
RU (1) | RU2393181C2 (ja) |
WO (1) | WO2007077787A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009029898A (ja) * | 2007-07-26 | 2009-02-12 | Sumitomo Rubber Ind Ltd | ゴム組成物およびランフラットタイヤ |
JP2013001889A (ja) * | 2011-06-21 | 2013-01-07 | Sumitomo Rubber Ind Ltd | サイドウォール用ゴム組成物及び空気入りタイヤ |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5091921B2 (ja) * | 2008-09-19 | 2012-12-05 | 住友ゴム工業株式会社 | タイヤ用ゴム組成物 |
DE102014212489A1 (de) | 2014-06-27 | 2015-12-31 | Continental Reifen Deutschland Gmbh | Schwefelvernetzbare Kautschukmischung und Fahrzeugreifen |
EP4127052A1 (en) * | 2020-03-30 | 2023-02-08 | Apollo Tyres Global R&D B.V. | Rubber composition for tyre body compounds |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005075951A (ja) * | 2003-09-01 | 2005-03-24 | Sumitomo Rubber Ind Ltd | タイヤ用ゴム組成物およびそれを用いたランフラットタイヤ |
JP2005247899A (ja) * | 2004-03-01 | 2005-09-15 | Ube Ind Ltd | ゴム組成物 |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4255296A (en) * | 1977-12-02 | 1981-03-10 | Bridgestone Tire Company Limited | Polybutadiene rubber composition |
JPS54132904A (en) * | 1978-04-06 | 1979-10-16 | Bridgestone Corp | Pneumatic tire with improved heating property |
US4645809A (en) * | 1986-01-23 | 1987-02-24 | The Goodyear Tire & Rubber Company | Direct method for preparing syndiotactic 1,2-polybutadiene |
US5058647A (en) * | 1988-10-11 | 1991-10-22 | The Goodyear Tire & Rubber Company | Tire having decorative applique on sidewall and method for preparing same |
JP2849237B2 (ja) * | 1991-06-07 | 1999-01-20 | 株式会社ブリヂストン | ゴム組成物 |
EP0612799B1 (en) * | 1993-02-09 | 1999-05-12 | Ube Industries, Ltd. | Process for the production of polybutadiene compositions |
JP2662172B2 (ja) * | 1993-09-29 | 1997-10-08 | 住友ゴム工業株式会社 | タイヤのビード部補強用ゴム組成物 |
JP4402545B2 (ja) * | 2004-08-25 | 2010-01-20 | 住友ゴム工業株式会社 | ゴム組成物 |
-
2006
- 2006-12-25 EP EP06843166A patent/EP1970405A4/en not_active Withdrawn
- 2006-12-25 US US12/087,333 patent/US20090000720A1/en not_active Abandoned
- 2006-12-25 RU RU2008129520/04A patent/RU2393181C2/ru not_active IP Right Cessation
- 2006-12-25 CN CNA2006800503358A patent/CN101351497A/zh active Pending
- 2006-12-25 WO PCT/JP2006/325762 patent/WO2007077787A1/ja active Application Filing
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005075951A (ja) * | 2003-09-01 | 2005-03-24 | Sumitomo Rubber Ind Ltd | タイヤ用ゴム組成物およびそれを用いたランフラットタイヤ |
JP2005247899A (ja) * | 2004-03-01 | 2005-09-15 | Ube Ind Ltd | ゴム組成物 |
Non-Patent Citations (1)
Title |
---|
See also references of EP1970405A4 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009029898A (ja) * | 2007-07-26 | 2009-02-12 | Sumitomo Rubber Ind Ltd | ゴム組成物およびランフラットタイヤ |
JP2013001889A (ja) * | 2011-06-21 | 2013-01-07 | Sumitomo Rubber Ind Ltd | サイドウォール用ゴム組成物及び空気入りタイヤ |
Also Published As
Publication number | Publication date |
---|---|
EP1970405A1 (en) | 2008-09-17 |
RU2393181C2 (ru) | 2010-06-27 |
US20090000720A1 (en) | 2009-01-01 |
CN101351497A (zh) | 2009-01-21 |
EP1970405A4 (en) | 2010-07-14 |
RU2008129520A (ru) | 2010-02-20 |
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