RUBBER COMPOSITION FOR TIRE TREAD AND TIRE MANUFACTURED BY USING SAME

• US 20200131348A1
• Filed: 10/17/2019
• Published: 04/30/2020
• Est. Priority Date: 10/29/2018
• Status: Active Application

• Current Assignee: Hankook Tire & Technology Co., Ltd.
• Original Assignee: Hankook Tire & Technology Co., Ltd.
• Inventors: LIM, Kiwon
• Application Number:
  US16/656,566
• Publication Number:
  US 20200131348A1
• Time in Patent Office: Days
• CPC Class Codes: B60C 1/0016 Compositions of the tread
• CPC Class Codes: B60C 11/0008 characterised by the tread rubber
• CPC Class Codes: B60C 2011/0025 Modulus or tan delta
• CPC Class Codes: C08L 2205/025 containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
• CPC Class Codes: C08L 2312/08 by silane
• CPC Class Codes: C08L 9/06 Copolymers with styrene

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 maintains low fuel consumption performance and can improve braking performance and handling performance on extremely dry and wet road surfaces by comprising 100 parts by weight of raw rubber, 100 to 150 parts by weight of silica, and 15 to 60 parts by weight of resin having a softening point of 100 to 150° C., wherein the raw rubber includes a solution-polymerized styrene butadiene rubber comprising 8 to 30 wt % of styrene, having 20 to 35 wt % of vinyl contained in butadiene, and having a molecular weight distribution of 2 to 5.

Claims

1. A rubber composition for tire tread, the rubber composition comprising:

100 parts by weight of raw rubber;

100 to 150 parts by weight of silica; and

15 to 60 parts by weight of resin having a softening point of 100 to 150°

C., wherein the raw rubber includes a solution-polymerized styrene butadiene rubber comprising 8 to 30 wt % of styrene, having 20 to 35 wt % of vinyl contained in butadiene, and having a molecular weight distribution of 2 to 5.

2. The rubber composition for tire tread of claim 1, wherein the solution-polymerized styrene butadiene rubber has a glass transition temperature of −

70 to −

30°

C., and the glass transition temperature is a glass transition temperature of a case that 10 to 40 parts by weight of oil are added to 100 parts by weight of the solution-polymerized styrene butadiene rubber.

3. The rubber composition for tire tread of claim 1, wherein the silica has a nitrogen adsorption specific surface area of 150 to 300 m²/g, a CTAB adsorption specific surface area of 140 to 280 m²/g, and a hydrogen ion exponent of pH 5 to pH 8.

4. The rubber composition for tire tread of claim 1, wherein the resin includes 5 to 25 parts by weight of a first resin having a softening point of 110 to 150°

C. and 10 to 40 parts by weight of a second resin having a softening point of 100 to 130°

C., and a weight ratio of the first resin to the second resin is 1;

1 to 1;

5.

5. The rubber composition for tire tread of claim 1, further comprising 5 to 15 parts by weight of a silane coupling agent with respect to 100 parts by weight of the raw rubber.

6. The rubber composition for tire tread of claim 5, wherein the silane coupling agent includes a sulfide-based silane compound and a mercapto-based silane compound, and a weight ratio of the sulfide-based silane compound to the mercapto-based silane compound is 1:

1 to 1;

2.

7. A tire manufactured by using the rubber composition for tire tread of claim 1.