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Briquetting molded body of rubber composition, method for producing same, rubber composition for crosslinking, and tread for tire

A technology of rubber composition and manufacturing method, which is applied in the direction of tire tread/tread pattern, special tire, tire parts, etc., and can solve the problems of increased viscosity of rubber composition, peeling of rubber composition, and easy pollution of molding molds, etc.

Pending Publication Date: 2021-12-28
ASAHI KASEI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, conventionally proposed rubber compositions containing a rubber-like polymer having an ethylene structure and introducing a crosslinkable unsaturated group have the following problems: the molding die is prone to contamination; the viscosity of the rubber composition is prone to change. rises periodically; or the rubber composition is easily peeled off from the briquette molded body

Method used

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  • Briquetting molded body of rubber composition, method for producing same, rubber composition for crosslinking, and tread for tire
  • Briquetting molded body of rubber composition, method for producing same, rubber composition for crosslinking, and tread for tire
  • Briquetting molded body of rubber composition, method for producing same, rubber composition for crosslinking, and tread for tire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0270] Hereinafter, the present embodiment will be described in more detail by giving specific examples and comparative examples, but the present embodiment is not limited to the following examples and comparative examples at all.

[0271] Various physical properties in Examples and Comparative Examples were measured by the methods shown below.

[0272] [Physical Properties of Rubbery Polymer (A)]

[0273] (weight average molecular weight (Mw) of the rubber-like polymer (A) before hydrogenation)

[0274] The chromatogram was measured using a GPC measuring device connected to three columns using polystyrene-based gel as a filler, and the weight-average molecular weight of the rubber-like polymer before hydrogenation was determined based on a calibration curve obtained using standard polystyrene (Mw).

[0275] As an eluent, THF (tetrahydrofuran) to which 5 mmol / L of triethylamine was added was used.

[0276] As for the column, a guard column: "TSKguardcolumn SuperH-H" manufactu...

manufacture example 1

[0360] 2 liters of dried and purified cyclohexane was charged into the nitrogen-purged reaction vessel, and 40 mmoles of bis(η5-cyclopentadiene)bis(p-tolyl)titanium and 1,000 molecular weight about 1,000 were dissolved therein. 2-polybutadiene (1,2-vinyl incorporation about 85%) 150 g. Thereafter, a cyclohexane solution containing 60 millimoles of n-butyllithium was added to the reaction vessel, and reacted at room temperature for 5 minutes, then 40 millimoles of n-butanol was immediately added and stirred to obtain a hydrogenation catalyst (TC-1). The resulting catalyst was stored at room temperature.

manufacture example 2

[0362] 1 liter of dried and purified cyclohexane was put into the reaction vessel replaced with nitrogen, 100 mmoles of bis(η5-cyclopentadiene)titanium dichloride was added, and the mixture containing trimethylaluminum was added while fully stirring. A 200 mmol n-hexane solution was reacted at room temperature for about 3 days to obtain a hydrogenation catalyst (TC-2).

[0363] (polymerization of rubber-like polymer (A))

[0364]

[0365] Using a temperature-controlled autoclave with an internal volume of 40 L and equipped with a stirrer and a jacket as a reactor, add 2,160 g of 1,3-butadiene, 300 g of styrene, and 21,000 g of cyclohexane from which impurities have been removed in advance. g. 30 mmol of tetrahydrofuran (THF) and 3.6 mmol of 2,2-bis(2-tetrahydrofuryl)propane as polar substances, and the internal temperature of the reactor was kept at 46°C.

[0366] 23.9 mmol of n-butyl lithium as a polymerization initiator was supplied to the above-mentioned reactor.

[036...

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Abstract

The present invention relates to a briquette molded body of a rubber composition, a method for producing the briquette molded body, a rubber composition for crosslinking, and a tread for a tire, and aims to obtain the briquette molded body of the rubber composition which is not easy to contaminate a molding die, the rubber composition is not easy to increase in viscosity over time, not easy to peel off from the briquette molded body, and the packaging sheet and the briquette molded body are easy to close. The briquette molded body of the rubber composition contains a rubbery polymer (A) having an iodine number of 10-250, an ethylene structure of not less than 3% by mass, and a vinyl aromatic monomer block of less than 10% by mass; and titanium (C), the content of titanium (C) being greater than or equal to 3 ppm and less than or equal to 120 ppm, and the content of aluminum (B) being less than 2 ppm.

Description

technical field [0001] The present invention relates to a briquette molded body of a rubber composition, a method for producing the same, a rubber composition for crosslinking, and a tire tread. Background technique [0002] In recent years, in the field of tire treads, sheets, films, and rubber materials for asphalt modification, for the purpose of improving mechanical strength and compression set, it has been proposed to contain an ethylene structure and introduce a cross-linkable unsaturated group. A rubber composition of a rubber-like polymer (for example, see Patent Documents 1 to 3). [0003] prior art literature [0004] patent documents [0005] Patent Document 1: International Publication No. 2019 / 151126 [0006] Patent Document 2: International Publication No. 2019 / 151127 [0007] Patent Document 3: International Publication No. 2019 / 078083 Contents of the invention [0008] The problem to be solved by the invention [0009] However, conventionally proposed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F297/04C08F8/04C08L53/02B60C1/00
CPCC08L53/025C08F8/04B60C1/0016C08F297/04C08F297/044C08L53/02C08C19/02C08L9/00C08K3/36C08K3/04C08K3/08C08F279/02C08K5/01B60C2011/0025B60C11/0008C08K2003/0881
Inventor 荒木祥文安本敦近藤知宏菊地章友
Owner ASAHI KASEI KK
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