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Propylene-based polymer additive for improved tire tread properties

A tire tread, diene terpolymer technology, used in special tires, tire parts, transportation and packaging

Active Publication Date: 2022-07-15
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 additive for improved tire tread properties
  • Propylene-based polymer additive for improved tire tread properties
  • Propylene-based polymer additive for improved tire tread properties

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, in particular 50-100 phr (parts by weight per hundred parts of total elastomer), as a high Tg elastomer with 0 to 70 phr, in particular 0-50 phr A blend of low Tg elastomers; according to another example, it comprises 70-100 phr of a low Tg elastomer exhibiting, for example, a cis-1,4-linkage content level of greater than 90%, or greater than 95% (molar %) of polybutadiene (BR); according to another example, it comprises all 100 phr of one or more SBRs prepared in solution.

[0052] According to another embodiment of the present invention, the diene elastomer of the composition according to the present invention comprises BR (as a low Tg elastomer) exhibiting a cis-1,4-structure level (mol %) of 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...

Embodiment

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

[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)dimethylene based on 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 MAOs can also be used.

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

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Abstract

Elastomeric compositions are disclosed. The elastomeric composition, per 100 parts by weight of rubber (phr), comprises: about 70 to about 90 phr of polybutadiene having a cis-1,4 linkage content of at least 95%; about 5 to 20 phr processed oil; about 5 to about 20 phr of sunflower oil; about 50 to about 75 phr of filler; curing agent; antioxidant; and about 5 to about 30 phr of ethylidene norbornene and / or about 5 to about 30 phr vinyl norbornene and about 10% to about 30% by weight of ethylene and / or C 4 ‑C 20 A propylene-ethylene-diene terpolymer of alpha-olefin derived units.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS [0002] This application claims priority to and the benefit of USSN 62 / 655,984, filed April 11, 2018, which is incorporated herein by reference in its entirety. [0003] Field of Invention [0004] The present 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 is to achieve excellent traction, low rolling resistance while providing good tread wear. The challenge is the trade-off between wet traction and rolling resistance / tread wear. Increasing the compound glass transition temperature (Tg) 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 tre...

Claims

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Application Information

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Patent Type & Authority Patents(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