Rubber composition made from highly saturated diene elastomer and dithiosulfate

A technology of dithiosulfate and rubber composition is applied in the field of diene rubber composition for manufacturing tires, and can solve the problems of unfavorable tire rolling resistance performance, increased hysteresis of rubber composition and the like

Active Publication Date: 2021-10-29
MICHELIN & CO CIE GEN DES ESTAB MICHELIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unfortunately, the use of diphenylguanidine leads to increased hysteresis in the rubber composition, which is detrimental to the good rolling resistance properties of the tire

Method used

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  • Rubber composition made from highly saturated diene elastomer and dithiosulfate
  • Rubber composition made from highly saturated diene elastomer and dithiosulfate
  • Rubber composition made from highly saturated diene elastomer and dithiosulfate

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no. 1 approach

[0024] According to a first embodiment of the invention, the highly saturated elastomer comprises UD units of formula (II) and may optionally comprise UE units of formula (III):

[0025]

[0026] Preferably, the highly saturated elastomer comprises the following UA, UB, UC, UD and UE units randomly distributed according to the mole percentages shown below:

[0027] UA) mole percent is m% -CH 2 -CH 2 -

[0028] UB) mole percent is n%-CH 2 -CH=CH-CH 2 -

[0029] UC) mole percent is o% -CH 2 -CH(CH=CH 2 )-

[0030]

[0031] UD) Mole percentage is p%

[0032] UE) mole percentage is q%

[0033] m, n, o, p and q are numbers from 0 to 100,

[0034] m>50

[0035] n+o>0

[0036] p>0

[0037] q≥0,

[0038] • The respective mole percentages of m, n, o, p and q are calculated based on the sum of m+n+o+p+q equal to 100.

[0039] More preferably:

[0040] 0

[0041] o+p+q≥5

[0042] n+o>0

[0043] q≥0,

[0044] • The respective mole percentages of m, n, o,...

Embodiment approach

[0077] According to a preferred embodiment of the invention, the rubber composition according to the invention is prepared by a process comprising the following stages:

[0078] a. adding to the elastomer matrix reinforcing fillers and optionally other components of the rubber composition other than dithiosulfate, sulfur and vulcanization accelerators constituting the vulcanization system,

[0079] b. Thermomechanical kneading of the mixture obtained in stage a) until reaching a maximum temperature between 110° C. and 190° C.,

[0080] c. cooling the combined mixture to a temperature of less than 100°C,

[0081] d. Subsequent addition of dithiosulfate, sulfur and vulcanization accelerator,

[0082] e. Kneading all substances to a maximum temperature of less than 110° C. to obtain a rubber composition.

[0083] The rubber composition can be in a green state (before vulcanization) or a cured state (after vulcanization).

[0084] The above and other features of the invention w...

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Abstract

The present invention relates to a rubber composition made of at least an elastomer matrix, a reinforcing filler and a vulcanization system, the elastomer matrix comprising a highly saturated elastomer and natural rubber from 0 to less than 30 phr, the highly saturated A diene elastomer comprising 1,3-diene units and greater than 50 mole percent ethylene units, the vulcanization system comprising the formula MO 3 S‑S‑A‑S‑SO 3 Dithiosulfate salts of M, wherein the symbol A represents an alkanediyl group or a group comprising two or more alkanediyl units passing through an oxygen atom or a sulfur atom, the formula -SO 2 ‑, ‑NH‑, ‑NH 2 + -, -N(C 1 -C 16 Alkyl)-or-COO-groups, or arylene or cycloalkylene groups are connected in pairs, and the symbol M represents a metal atom. The present invention enables an improved compromise between the formation of air bubbles in the rubber composition when leaving the vulcanizer and the hysteresis of said composition.

Description

technical field [0001] The present invention relates to diene rubber compositions which are particularly useful in the manufacture of tires. Background technique [0002] Ideally, rubber compositions intended for use in tires must satisfy a large number of often contradictory technical requirements, for example, they must have high stiffness and low hysteresis. [0003] It is known from patent application WO 2014114607 that a highly unsaturated diene elastomer can be replaced by a highly saturated elastomer comprising more than 50 mol % of ethylene units (that is to say comprising more than 50 mol % of diene units) A more rigid composition is obtained. Unlike highly unsaturated diene elastomers (such as polybutadiene, polyisoprene, and copolymers of butadiene and styrene) conventionally used in rubber compositions, these highly saturated elastomers also have the advantage of It is a compromise between imparting stiffness and hysteresis properties to the rubber composition....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/08B60C1/00
CPCB60C1/00C08L23/083C08L7/00C08K3/04C08K5/41C08F210/02C08F236/06C08K5/42C08F2800/10C08J3/203
Inventor J-C·阿劳约达席尔瓦A·特里格尔A·克罗谢
Owner MICHELIN & CO CIE GEN DES ESTAB MICHELIN
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