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Rubber composition and pneumatic tire using the same

A technology of rubber composition and pneumatic tire, which is applied in the field of rubber composition and pneumatic tire using the rubber composition, which can solve the problem of easy scorching, increased heat generation, undisclosed improvement of high hardness, enhanced rubber fluidity and dimensional stability Issues such as the extrusion processability of the bottom surface of the tread

Inactive Publication Date: 2007-02-28
THE YOKOHAMA RUBBER CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the cross-linked rubber particles of this invention are obtained at a high polymerization conversion rate, there are many problems in which toluene-insoluble components cannot be obtained, sufficient mechanical properties cannot be obtained, bending fatigue resistance is deteriorated, and improvement in wear resistance is insufficient.
[0006] Tire treads are usually produced by extrusion molding, but there are problems that cracks often appear at the end of the tread during extrusion, and the tire molding accuracy in the subsequent process deteriorates.
As a result, since the viscosity is high when not vulcanized, and the heat generated during extrusion becomes large, coking is likely to occur during extrusion processing.
In addition, if the size is thick, it will generate more heat during extrusion, so it is still easy to burn
Furthermore, if the viscosity is high, the extruded extrudate will expand and the extrudate will shrink easily.
[0014] In addition, JP-A-2002-60437 discloses a conjugated diene-based rubber gel having a toluene swelling index of 16 to 70, and by mixing the conjugated diene-based rubber with sulfur-crosslinkable rubber, Gel, a rubber composition that exhibits excellent wear resistance and low heat generation can be obtained while maintaining good mechanical properties, but there is no disclosure of improving the fluidity and dimensional stability of high-hardness reinforced rubber during extrusion molding rubber at both ends of the tread, and extrusion processability of the bottom surface of the tread

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment I-1～I-4 and comparative example I-1～I-4

[0076] Production of Conjugated Diene Rubber Gels

[0077] Add 180 parts by weight of water, a total of 4 parts by weight of uneven potassium resinate and sodium fatty acid as an emulsifier, 0.1 parts by weight of potassium chloride, each shown in the following table I-1 in a pressure-resistant reaction vessel. Monomer and chain transfer agent (t-dodecyl mercaptan) were stirred while making the internal temperature 12°C, and then 0.1 parts by weight of cumene hydroperoxide as a radical polymerization initiator, 0.15 parts by weight of Sodium formaldehyde sulfoxylate and 0.04 parts by weight of ferric sulfate start the polymerization reaction. When the polymerization conversion reached about 50%, an additional chain transfer agent was added as shown in Table I-1. The reaction was continued at 12° C. until the polymerization conversion rate reached about 70%, and then 0.1 parts by weight of diethylhydroxylamine was added to start the polymerization reaction. Then, the temperat...

Embodiment II-1～II-4 and comparative example II-1～II-4

[0101] Production of Conjugated Diene Rubber Gels

[0102] Add 180 parts by weight of water, a total of 4 parts by weight of heterogeneous resinate potassium and fatty acid sodium as emulsifiers, 0.1 parts by weight of potassium chloride, each of the following table II-1 shown in the pressure-resistant reaction vessel. Monomer and chain transfer agent (t-dodecyl mercaptan) were stirred while making the internal temperature 12°C, and then 0.1 parts by weight of cumene hydroperoxide as a radical polymerization initiator, 0.15 parts by weight of Sodium formaldehyde sulfoxylate and 0.04 parts by weight of ferric sulfate start the polymerization reaction. When the polymerization conversion reached about 50%, an additional chain transfer agent was added as shown in Table II-1. The reaction was continued at 12° C. until the polymerization conversion rate reached about 70%, and then 0.1 parts by weight of diethylhydroxylamine was added to start the polymerization reaction. Then, the...

Embodiment IIl-1～III-10 and comparative example III-1～III-4

[0128] Production of Conjugated Diene Rubber Gels

[0129] Add 180 parts by weight of water, a total of 4 parts by weight of heterogeneous resinate potassium and fatty acid sodium as emulsifiers, 0.1 parts by weight of potassium chloride, each of the following table III-1 shown in the pressure-resistant reaction vessel. Monomer and chain transfer agent (t-dodecyl mercaptan) were stirred while making the internal temperature 12°C, and then 0.1 parts by weight of cumene hydroperoxide as a radical polymerization initiator, 0.15 parts by weight of Sodium formaldehyde sulfoxylate and 0.04 parts by weight of ferric sulfate start the polymerization reaction. When the polymerization conversion reached about 50%, an additional chain transfer agent was added as shown in Table III-1. The reaction was continued at 12° C. until the polymerization conversion rate reached about 70%, and then 0.1 parts by weight of diethylhydroxylamine was added to start the polymerization reaction.

[0130...

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Abstract

A rubber composition which comprises (i) a conjugated diene based rubber gel exhibiting a toluene swelling index of 16 to 70, (ii) a diene based rubber such as natural rubber, a polyisoprene rubber, an aromatic vinyl-conjugated diene copolymer rubber and / or a polybutadiene rubber, and optionally (iii) carbon black and / or silica; and (a) a pneumatic tire using the above composition in a high hardness reinforcing layer extending along a tire side wall from a bead section, which is improved in the fluidity and dimensional stability in extruding molding, with the retention of satisfactory hardness of a high hardness reinforcing rubber, (b) a pneumatic tire using the above composition in both end portions of an extruded tire tread, which is improved in its processability and dimensional stability in extruding molding, with the retention of flex fatigue characteristics in both end portions of a tread, and (c) a pneumatic tire using the above composition as an under tread having a thickness of 1.5 to 6 mm, which has a relatively thick under tread exhibiting a high elastic modulus and is excellent in processability and driving stability.

Description

technical field [0001] The present invention relates to a rubber composition and a pneumatic tire using the rubber composition. More specifically, it relates to a rubber compounded with a toluene swelling index of 16-70 A pneumatic tire having improved extrusion fluidity and extrusion dimensional stability during manufacture while maintaining the bending fatigue properties of a high-hardness reinforcing layer extending from the bead portion along the tire sidewall, (b) Both ends of the tread (c) a pneumatic tire with improved extrusion processability and extrusion dimensional stability, (c) a rubber composition for tire treads having very high wet performance and excellent wear resistance, (d) Even if the compounding rate of the silica filler is increased to achieve both wet road performance and low fuel consumption, the rubber composition for tire treads has no problem in processability during extrusion, and (e) is equipped with high A pneumatic tire with a thicker modulus, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L7/00B60C1/00B60C11/00C08K3/04C08K3/34C08L9/06B60C15/06C08L9/00C08L21/00
CPCB60C15/06B60C1/00B60C1/0016B60C1/0025C08L7/00C08L9/00C08L9/06C08L21/00C08L2666/08C08L2666/02C08K3/04C08K3/34
Inventor 网野直也日座操城川隆中村昌生远藤孝一
Owner THE YOKOHAMA RUBBER CO LTD
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