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Unconjugated polyene copolymer, rubber composition and uses of those

A rubber composition, non-conjugated technology, applied in the field of non-conjugated polyolefin copolymers, to achieve the effects of excellent rubber elasticity, excellent fuel consumption, and large contact area

Inactive Publication Date: 2007-04-18
MITSUI CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, according to the studies of the present applicants, it has been found that there is still room for improvement in the braking performance and fatigue resistance of tires, and there is also room for improvement in mechanical strength.

Method used

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  • Unconjugated polyene copolymer, rubber composition and uses of those
  • Unconjugated polyene copolymer, rubber composition and uses of those
  • Unconjugated polyene copolymer, rubber composition and uses of those

Examples

Experimental program
Comparison scheme
Effect test

Embodiment X1

[0227] Polymerization was performed by a continuous method using a reactor having a volume of 300 L having a stirrer made of SUS and maintaining a liquid level of 100 L at a temperature of 80°C. The main catalyst is (tert-butyramide) dimethyl (tetramethyl-η 5 - cyclopentadienyl) silane titanium dichloride, the cocatalyst is (C 6 h 5 ) 3 CB(C 6 f 5 ) 4 , The organoaluminum compound is triisobutylaluminum (hereinafter referred to as TIBA). The supply conditions of the raw materials are as follows.

[0228] Hexane

[0229] The obtained polymerization solution was subjected to a standard stripping operation to obtain a resin. The obtained copolymer had an ethylene content of 64.4 mol%, a propylene content of 30.1 mol%, an ENB content of 5.5 mol%, and an ML(1+4) of 55 at 100°C. The yield is 5.6kg per hour.

Embodiment X2

[0231] Except for changing the supply conditions of raw materials, it carried out under the same conditions as Example X1. The supply conditions of the raw materials are as follows.

[0232] Hexane

[0233] The obtained copolymer had an ethylene content of 65.1 mol%, a propylene content of 30.3 mol%, an ENB content of 4.6 mol%, and an ML(1+4) of 55 at 100°C. The yield is 5.6kg per hour.

Embodiment X3

[0272] Example X3, Comparative Examples X4, X5, X6 and X7

[0273] Each component having the composition shown in Table 7 was kneaded with an open drum (front drum / rear drum=60 / 60° C., 16 / 18 rpm) to obtain an unvulcanized compound rubber. The unvulcanized compounded rubber was heated for 15 minutes with an extruder heated to 160°C to make a vulcanized sheet, and the following tests were carried out. The results are shown in Table 8.

[0274] Example X3

Comparative example X4

Comparative example X5

Comparative example X6

Comparative example X7

Copolymer of Example X1 * 1

30

-

-

-

-

Copolymer of Comparative Example X1 * 2

-

30

-

-

-

Copolymer of Comparative Example X2 * 3

-

-

30

-

-

Copolymer of Comparative Example X3 * 4

-

-

-

30

-

SBR * 5

70

70

70

70

100 ...

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Abstract

Disclosed is an unconjugated polyene copolymer which is a random copolymer containing a structural unit derived from an alpha-olefin (A1) having 2-20 carbon atoms and a structural unit derived from an unconjugated polyene (A2). Such an unconjugated polyene copolymer is characterized by having a glass transition temperature (Tg) from -25 to 20 1 / 2 C, and a Mooney viscosity (ML(1+4)100 1 / 2 C) of 5-190. Also disclosed are a rubber composition characterized by containing such an unconjugated polyene copolymer and a diene rubber (B), a tire modifier composed of such a copolymer, a rubber material for tires composed of such a rubber composition,a tire tread obtained from such a rubber material for tires, and a tire comprising such a tire tread.

Description

technical field [0001] The present invention relates to a non-conjugated polyolefin copolymer, a rubber composition containing the copolymer and a diene rubber, and uses thereof. Background technique [0002] As rubber materials for automobile tire treads, styrene-butadiene copolymer rubber (SBR) and diene rubber compositions of natural rubber are generally used. However, in recent years, along with energy saving, not only the reduction of fuel consumption and the improvement of wear resistance of automobiles have been demanded, but also the development of tires with high braking performance in terms of safety has been desired. [0003] Here, the present applicant has proposed a rubber material for automobile tire treads, which contains a non-conjugated cyclic polyene-based copolymer having a specific non-conjugated cyclic polyene content and iodine value as one of its components. [0004] However, according to studies by the present applicants, it has been found that there...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F210/00C08F236/20C08L9/00C08L23/02
Inventor 村上英达冈田圭司市野光太郎川崎雅昭江端洋树羽佐田恭弘池永成伸
Owner MITSUI CHEM INC