RUBBER COMPOSITION FOR TIRE BEAD FILLER AND PNEUMATIC TIRE USING THE SAME

PROBLEM TO BE SOLVED: To overcome aggravation of crack growth resistance by a method of using carbon black with a large particle diameter or reducing the blended amount of oil for satisfying the requirements for a bead filler: no reduction in hardness at high temperature, low heat generation propert...

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Bibliographic Details
Main Authors HIJIKATA KENSUKE, ASHIURA MAKOTO, SHIMIZU YUKI
Format Patent
LanguageEnglish
Japanese
Published 01.09.2016
Subjects
CHEMISTRY
COMPOSITIONS BASED THEREON
COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
DEVICES OR ARRANGEMENTS RELATED TO TYRES
METALLURGY
ORGANIC MACROMOLECULAR COMPOUNDS
PERFORMING OPERATIONS
REPAIRING, OR CONNECTING VALVES TO, INFLATABLE ELASTIC BODIESIN GENERAL
THEIR PREPARATION OR CHEMICAL WORKING-UP
TRANSPORTING
TYRE CHANGING OR REPAIRING
TYRE INFLATION
USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS
VEHICLE TYRES
VEHICLES IN GENERAL
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Summary:PROBLEM TO BE SOLVED: To overcome aggravation of crack growth resistance by a method of using carbon black with a large particle diameter or reducing the blended amount of oil for satisfying the requirements for a bead filler: no reduction in hardness at high temperature, low heat generation property and excellent crack growth resistance, and problems of aggravation of temperature dependency of hardness, heat generation property and crack growth resistance, due to a method of blending a thermosetting resin, although the method provides high hardness.SOLUTION: The above described problem is solved by a rubber composition for tire bead filler by blending 100 pts.mass of diene rubber containing NR of 50 to 80 pts.mass and SBR of 20 to 50 pts.mass, 60 to 90 pts.mass of carbon black having nitrogen adsorption specific area (NSA) of 25 to 85 m/g and 0.1 to 5 pts.mass of for example anthraquinone sodium sulfonate.SELECTED DRAWING: None 【課題】ビードフィラーは高温時に硬度が低下しないこと、低発熱性であること、耐クラック成長性に優れることが求められている。そのため、大粒径のカーボンブラックを使用したり、オイルの配合量を減少する手法があるが、耐クラック成長性の悪化を招いていた。また、熱硬化性樹脂を配合する手法もあるが、高硬度は得られるものの、硬度の温度依存性、発熱性および耐クラック成長性が悪化するという問題点がある。【解決手段】ＮＲを５０〜８０質量部およびＳＢＲを２０〜５０質量部含むジエン系ゴム１００質量部に対し、窒素吸着比表面積（Ｎ２ＳＡ）が２５〜８５ｍ２／ｇのカーボンブラックを６０〜９０質量部、および例えばアントラキノンスルホン酸ナトリウムを０．１〜５質量部配合してなるタイヤビードフィラー用ゴム組成物によって上記課題を解決した。【選択図】なし
Bibliography:Application Number: JP20160026834