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Pneumatic tire

A technology of pneumatic tires and tires, which is applied to special tires, tire parts, tire treads/tread patterns, etc., and can solve problems such as insufficient handling stability and ride comfort

Pending Publication Date: 2022-02-22
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the steering stability and ride comfort at high speeds are not sufficiently satisfied

Method used

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  • Pneumatic tire
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0187] Although the present invention is specifically described based on examples, the present invention is not limited to these examples.

[0188] Hereinafter, various agents used in Examples and Comparative Examples are collectively shown.

[0189] SBR1: S-SBR produced in Production Example 1 described later (styrene content: 30 mass%, vinyl content: 52 mol%, Mw: 250,000, non-oil-extended)

[0190] SBR2: HP755 manufactured by JSR Corporation (S-SBR; styrene content: 40% by mass, vinyl content: 38% by mole, oil-extended product containing 37.5 parts by weight of oil per 100 parts by weight of the rubber component)

[0191] BR1: UBEPOL BR (registered trademark) 150B manufactured by Ube Industries, Ltd. (cis content: 97%, Mw: 440,000)

[0192] BR2: BR500 manufactured by JSR Corporation (cis content: 32%)

[0193] Carbon black: Diablack N220 (N 2 SA: 115m 2 / g)

[0194] Silica: ULTRASIL (registered trademark) VN3 (N) manufactured by Evonik Degussa 2 SA: 175m 2 / g)

[019...

manufacture example 1

[0205] Production Example 1: Synthesis of SBR1

[0206] Cyclohexane, tetrahydrofuran, styrene and 1,3-butadiene were charged into the nitrogen-purged autoclave reactor. After adjusting the temperature of the contents of the reactor to 20° C., n-butyllithium was added to start polymerization. Polymerization under adiabatic conditions with a maximum temperature of 85°C. When the polymerization conversion rate reached 99%, 1,3-butadiene was added, and after another 5 minutes of polymerization, N,N-bis(trimethylsilyl)-3-aminopropyltrimethoxysilane was used as a modification Agents are added and reacted. After the polymerization reaction was completed, 2,6-di-tert-butyl-p-cresol was added. Next, solvent removal was carried out by stripping, and drying was carried out with a hot roll adjusted to 110° C. to obtain SBR1.

[0207] Based on the compounding contents shown in Table 1, sulfur and chemicals other than the vulcanization accelerator were kneaded at a discharge temperature o...

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Abstract

Provided is a pneumatic tire having both riding comfort at low temperatures and steering stability during high-speed traveling. The pneumatic tire is provided with a tread portion having: two or more circumferential grooves continuously extending in the circumferential direction of the tire; a pair of shoulder land portions separated by the circumferential grooves; and a central land portion located between the pair of shoulder land portions; lateral grooves; and cutter grooves (optional). When the tire cross-sectional width is Wt (mm) and the tire outer diameter is Dt (mm), Wt and Dt satisfy the following formula (1). When the area of the entire ground portion is Sr and the total area of the central ground portion is Sce, Sr and Sce satisfy the following formula (2). The tread portion has at least one rubber layer comprising a rubber composition containing a rubber component, and 5 DEG C tan[delta], 20 DEG C tan[delta] and 50 DEG C tan[delta], measured under conditions of a frequency of 10 Hz and an elongation strain of 2.5%, of the rubber composition satisfies the following formulae (3) and (4). Formula (1) 1963.4 < = (pi / 4) * (Dt2 / Wt) < = 2827.4; Formula (2) 0.35 < = Sce / Sr < = 0.80; Formula (3) 0.01 < = |20 DEG C tan [delta] + 50 DEG C tan [delta] / 2| < = 0.17 Formula (4) 0.30 < = |5 DEG C tan [delta] + 20 DEG C tan [delta] / 2| < = 0.60.

Description

technical field [0001] The present invention relates to a pneumatic tire. Background technique [0002] In recent years, in addition to the obvious enrichment of automobile equipment and performance, the road network has also expanded and developed, so the situation of high-speed driving has increased. The base tread of the tire. [0003] For example, Patent Document 1 discloses a pneumatic tire having a base tread compounded with collagen particles. However, the steering stability and ride comfort during high-speed running are not sufficiently satisfied. [0004] prior art literature [0005] patent documents [0006] Patent Document 1: Japanese Patent Laid-Open No. 2004-269684 Contents of the invention [0007] The technical problem to be solved by the invention [0008] An object of the present invention is to provide a tire that achieves both ride comfort at low temperatures and steering stability at high speeds. [0009] means of solving technical problems [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C11/00
CPCB60C11/0008B60C2011/0016B60C2011/0025B60C11/033B60C11/0332B60C1/0016B60C11/0327
Inventor 畑加奈子土田刚史
Owner SUMITOMO RUBBER IND LTD
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