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Propylene-based polymer additives for improved tire tread performance

A technology of tire tread and diene terpolymer, applied in special tires, tire parts, transportation and packaging, etc.

Active Publication Date: 2020-12-25
EXXONMOBIL CHEM PAT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Nanoprene achieves only limited improvements in wet traction

Method used

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  • Propylene-based polymer additives for improved tire tread performance
  • Propylene-based polymer additives for improved tire tread performance
  • Propylene-based polymer additives for improved tire tread performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0051] According to another embodiment of the present invention, the rubber composition comprises, for example, 30-100 phr, especially 50-100 phr (parts by weight / percent of total elastomer) of a high Tg elastomer as a compound of 0 to 70 phr, especially 0-50 phr A blend of low Tg elastomers; according to another example, it comprises 70-100 phr of low Tg elastomers exhibiting, for example, greater than 90%, or greater than 95% cis-1,4-linkage content levels (molar %) of polybutadiene (BR); according to another example, it contains all 100 phr of one or more SBRs prepared in solution.

[0052] According to another embodiment of the invention, the diene elastomer of the composition according to the invention comprises BR (as a low Tg elastomer) exhibiting a cis-1,4-structure level (mol %) greater than 90% Blends with one or more S-SBR or E-SBR as high Tg elastomer(s).

[0053] The compositions described herein may comprise a single diene elastomer or a mixture of several diene...

Embodiment

[0100] Seven propylene-ethylene-diene terpolymer (PEDM) additives (Table 1 ) were used in the tire tread formulations of the following examples.

[0101] Preparation of amorphous propylene-based copolymers (PEDM 1 to 7)

[0102] Catalyst system: The catalyst precursor is bis((4-triethylsilyl)phenyl)methylene(cyclopentadienyl)(2,7-di-tert-butyl-fluoren-9-yl)dimethyl Based hafnium. However, other metallocene precursors with good diene incorporation and MW capabilities can also be used.

[0103] The activator is dimethylanilinium tetrakis(pentafluorophenyl)borate, but dimethylanilinium tetrakis(heptafluoronaphthyl)borate and other non-coordinating anionic activators or MAO can also be used.

[0104] Polymerization experiments were performed in a Continuous Stirred Tank Reactor (CSTR) manufactured by Autoclave Engineers, Erie, PA. The reactor was designed to operate at a maximum pressure and temperature of 2000 bar (30 kpsi) and 225°C, respectively, but current experiments have...

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Abstract

An elastomeric composition is disclosed. The elastomeric composition includes, per 100 parts by weight of rubber (phr): about 70 to about 90 phr of polybutadiene having a cis-1,4 linkage content of atleast 95%; about 5 to 20 phr of a processing oil; about 5 to about 20 of sunflower oil; about 50 to about 75 phr of a filler; a curative agent; an antioxidant; and about 5 to about 30 phr of a propylene-ethylene-diene terpolymer containing from about 0.2 wt% to about 20 wt% ethylidene norbomene and / or vinyl norbomene and about 10 wt% to about 30 wt% of ethylene and / or C4-C20alpha-olefins derivedunits.

Description

[0001] Cross References to Related Applications [0002] This application claims priority and benefit to USSN 62 / 655,984, filed April 11, 2018, which is hereby incorporated by reference in its entirety. [0003] field of invention [0004] This invention relates to propylene-ethylene-diene terpolymers useful as tire tread modifiers. [0005] Background of the invention [0006] Tire tread compounds are important compounds in tires that determine wear, traction and rolling resistance. The technical challenge was to achieve excellent traction, low rolling resistance while providing good tread wear. The challenge is the tradeoff between wet traction and rolling resistance / tread wear. Increasing the glass transition temperature (Tg) of the compound will provide better wet traction, but at the same time increase rolling resistance and tread wear. There is a need to develop tread compound additives that provide good wet traction without increasing rolling resistance and tread wea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C1/00C08L9/00C08L23/16C08L91/00C08K5/09C08L79/04
CPCB60C1/0016C08L9/00C08L23/16C08L91/00C08L79/04C08K3/36C08K5/31C08K5/09C08K5/18C08K3/22C08K5/47C08K3/06C08K5/548C08K3/04C08L9/06
Inventor E·J·布劳克A·J·狄亚斯G·基什
Owner EXXONMOBIL CHEM PAT INC