Rubber composition for tire tread and tire manufactured by using same

Patent metadata

Field	Value
Publication number	US-11267286-B2
Application number	US-201916708675-A
Country	US
Kind code	B2
Filing date	Dec 10, 2019
Priority date	May 23, 2019
Publication date	Mar 8, 2022
Grant date	Mar 8, 2022

Abstract

The present disclosure relates to a rubber composition for tire tread and a tire manufactured by using the same, and the rubber composition for tire tread improves rolling resistance and abrasion resistant performance and can improve handling and braking performances on a wet road surface and an ice and snow road surface at the same time by comprising 100 parts by weight of raw rubber and 70 to 120 parts by weight of a reinforcing filler, wherein the raw rubber includes 0 to 50 parts by weight of natural rubber, 20 to 100 parts by weight of a melt grafting-functionalized styrene butadiene rubber, and 0 to 30 parts by weight of butadiene rubber.

First claim

What is claimed is:

1. A rubber composition for tire tread, the rubber composition comprising 100 parts by weight of raw rubber and 70 to 120 parts by weight of a reinforcing filler, wherein the raw rubber includes 0 to 50 parts by weight of natural rubber, 20 to 100 parts by weight of a melt grafting-functionalized styrene butadiene rubber, and 0 to 30 parts by weight of butadiene rubber.

2. The rubber composition for tire tread of claim 1 , wherein the melt grafting-functionalized styrene butadiene rubber introduces a peroxide and an acrylate-based or methacrylate-based functional group using an emulsion-polymerized or solution-polymerized styrene butadiene rubber.

3. The rubber composition for tire tread of claim 1 , wherein the melt grafting-functionalized styrene butadiene rubber includes 20 to 50 wt % of styrene, and has 10 to 40 wt % of vinyl contained in butadiene.

4. The rubber composition for tire tread of claim 1 , wherein the melt grafting-functionalized styrene butadiene rubber has a glass transition temperature of −50 to −10° C., and includes 10 to 40 parts by weight of oil with respect to 100 parts by weight of the melt grafting-functionalized styrene butadiene rubber.

5. The rubber composition for tire tread of claim 2 , wherein the acrylate-based functional group is selected from the group consisting of 2-carboxyethyl acrylate, methyl acrylate, ethyl acrylate, ethylene glycol methyl ether acrylate, vinyl acrylate, 2-hydroxyethyl acrylate, isooctyl acrylate, octyl acrylate, and combinations thereof, and the methacrylate-based functional group is selected from the group consisting of methyl methacrylate, 2-(diethylamino)ethyl methacrylate, polymethylmethacrylate, poly(ethylene glycol)methacrylate, hydroxypropyl methacrylate, ethylene glycol methyl ether methacrylate, 2-(dimethylamino)ethyl methacrylate, 2-(diethylamino)ethyl methacrylate, glycidyl methacrylate, and combinations thereof.

6. The rubber composition for tire tread of claim 1 , wherein the butadiene rubber includes 90 wt % or more of cis-1,4-butadiene and has a glass transition temperature of −100 to −120° C.

7. The rubber composition for tire tread of claim 1 , wherein the reinforcing filler includes 5 to 20 parts by weight of carbon black and 65 to 100 parts by weight of silica.

8. The rubber composition for tire tread of claim 7 , wherein the silica is high dispersibility silica having a nitrogen adsorption specific surface area of 160 to 180 m 2 /g and a CTAB adsorption specific surface rea of 150 to 170 m 2 /g.

9. A tire manufactured by using the rubber composition for tire tread of any one of claims 1 to 8 .

Assignees

• Hankook Tire & Tech Co Ltd

Inventors

• Kim Kihyun

Classifications

• C08C19/00

  Chemical modification of rubber · CPC title

• C08K3/36

  Silica · CPC title

• C08K3/04

  Carbon · CPC title

• C08C19/28 Primary

  Reaction with compounds containing carbon-to-carbon unsaturated bonds (graft polymers C08F279/00) · CPC title

• C08L9/06

  Copolymers with styrene · CPC title