Rubber composition for a vehicle part

Patent metadata

Field	Value
Publication number	US-2023074171-A1
Application number	US-202217901939-A
Country	US
Kind code	A1
Filing date	Sep 2, 2022
Priority date	Sep 3, 2021
Publication date	Mar 9, 2023
Grant date	—

Abstract

Disclosed is a rubber composition including a copolymer including polyethylene, α-olefin, and non-conjugated polyene; natural rubber; a filler; and a coupling agent, a vehicle part including the same, and a vehicle including the same. The rubber bushing composition includes the components uniformly dispersed such that compatibility and physical properties thereof can be improved. Further, a product (e.g., vehicle part) obtained from the rubber bushing composition can have superior heat resistance, fatigue resistance, and compression set resistance.

First claim

What is claimed is:

1 . An rubber composition, comprising:
a copolymer comprising ethylene, α-olefin, and non-conjugated polyene; a natural rubber; a filler; and a coupling agent.

2 . The rubber composition of claim 1 , wherein the coupling agent comprises a compound containing silicon (Si).

3 . The rubber composition of claim 1 , comprising:
an amount of about 50 parts by weight to 70 parts by weight of the copolymer; an amount of about 30 parts by weight to 50 parts by weight of the natural rubber; an amount of about 50 parts by weight to 70 parts by weight of the filler; and an amount of about 1 part by weight to 10 parts by weight of the coupling agent, based on 100 parts by weight of the composition.

4 . The rubber composition of claim 2 , wherein the copolymer comprises an amount of about 15 parts by weight to 25 parts by weight of an oil-extended ethylene/propylene/non-conjugated diene terpolymer (oil-extended EPDM) and an amount of about 35 parts by weight to 45 parts by weight of a non-oil-extended ethylene/propylene/non-conjugated diene terpolymer (non-oil-extended EPDM), based on 100 parts by weight of the composition.

5 . The rubber composition of claim 4 , wherein the oil-extended EPDM comprises an amount of 65 mass % to 75 mass % of a repeating unit derived from ethylene based on a total of 100 mass % thereof.

6 . The rubber composition of claim 4 , wherein the non-oil-extended EPDM comprises an amount of about 65 mass % to 75 mass % of a repeating unit derived from ethylene based on a total of 100 mass % thereof.

7 . The rubber composition of claim 1 , wherein the filler comprises carbon black having a particle diameter of about 40 nm to 44 nm.

8 . The rubber composition of claim 1 , further comprising an additive comprising one or more selected from the group consisting of an activator, an antioxidant, sulfur, and a vulcanization accelerator.

9 . A vehicle part comprising a rubber bushing composition of claim 1 .

10 . A vehicle comprising a rubber bushing composition of claim 1 .

Assignees

• Hyundai Motor Co Ltd
• Kia Corp

Inventors

• Lee Sung Hyun
• Jung Heon Seob

Classifications

• C08L23/16 Primary

  Ethylene-propylene or ethylene-propylene-diene copolymers · CPC title

• C08L2205/03

  containing three or more polymers in a blend · CPC title

• C08L2205/025

  containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure · CPC title

• C08L7/00

  Compositions of natural rubber · CPC title