KR102364060B1 - Rubber composition for tire tread and tire manufactured by using the same - Google Patents

Abstract

The present invention relates to a rubber composition for a tire tread and a tire manufactured using the same, wherein the rubber composition for a tire tread comprises 50 parts by weight to 90 parts by weight of natural rubber and 10 parts by weight to 50 parts by weight of continuous solution polymerization styrene-butadiene rubber. 100 parts by weight of raw rubber including parts, 5 parts by weight to 50 parts by weight of highly dispersible silica, and 5 parts by weight to 50 parts by weight of carbon black, and 2 parts by weight to 30 parts by weight of soybean oil. .
The rubber composition for a tire tread may improve low fuel efficiency, braking performance on a wet road surface, and handling performance while minimizing the occurrence of a trade-off in tire wear performance.

Description

A rubber composition for a tire tread and a tire manufactured using the same

The present invention relates to a rubber composition for a tire tread and a tire manufactured using the same, and more particularly, to a low fuel consumption performance, braking performance on a wet road surface, The present invention relates to a rubber composition for a tire tread capable of improving handling performance, and a tire manufactured using the same.

As the European Union (EU) labeling and application of the minimum regulations apply to truck-bus tires, not only the traditionally required tire abrasion performance, but also the vehicle's fuel economy and performance against wet road braking have become essential factors.

In addition, along with numerous environmental regulations, automobile manufacturers are also increasing the demand for handling performance as well as labeling performance.

The tread, which is a part of a vehicle that is in direct contact with the ground, is a part that largely controls tire wear, fuel economy, wet road braking performance, and handling performance. However, it is most important to balance each performance because the performance of each of abrasion, fuel economy, wet road braking force, and handling is trade-off due to the characteristics of the tire tread.

In the case of truck-bus tires, durability performance according to driving characteristics under high load conditions and wear performance directly related to the life of the tire are important, so a rubber composition mainly made of natural rubber and carbon black as fillers has been developed and used. However, both rolling resistance and wet road braking performance cannot be satisfied only with a rubber composition using natural rubber and carbon black as fillers.

In the prior art, it is common to use natural rubber and carbon black for the rubber composition for treads, and it is the easiest way to increase the amount of reinforcing filler to improve road braking performance, but in this case, loss due to bonding between fillers As energy increases, fuel economy performance deteriorates. When silica is applied as a filler to simultaneously improve fuel efficiency and braking power on wet roads, and synthetic rubber is applied to improve handling performance, the wear performance is lowered compared to when conventional natural rubber and carbon black are used. In addition, due to the low affinity between silica and natural rubber, it is difficult to disperse and process, so it is necessary to apply a process oil or a softener. When TDAE (treated distillate aromatic extracts) is applied, the tread wear and cutting resistance performance There is a problem that causes a decrease in

SUMMARY OF THE INVENTION It is an object of the present invention to provide a rubber composition for a tire tread capable of improving low fuel efficiency, braking performance on a wet road surface, and handling performance while minimizing the occurrence of a trade-off in tire wear performance.

Another object of the present invention is to provide a tire manufactured using the rubber composition for a tire tread.

According to an embodiment of the present invention, 100 parts by weight of raw rubber containing 50 parts by weight to 90 parts by weight of natural rubber and 10 parts by weight to 50 parts by weight of continuous solution polymerization styrene-butadiene rubber, 5 parts by weight to 50 parts by weight of highly dispersible silica Provided is a rubber composition for a tread comprising a reinforcing filler comprising 5 parts by weight to 50 parts by weight of carbon black and 2 parts by weight to 30 parts by weight of soybean oil.

The continuous solution polymerization styrene-butadiene rubber has a styrene content of 10% to 60% by weight, a vinyl content of 10% to 70% by weight in butadiene, and a glass transition temperature (Tg) of -70 ℃ to -40 ℃ and a weight average molecular weight of 400,000 g/mol to 1,500,000 g/mol, and a molecular weight distribution of 3.0 or less.

The carbon black may have an iodine adsorption value of 60 mg/g to 120 mg/g, an n-dibutyl phthalate (DBP) oil absorption of 100 cc/100g to 160 cc/100g, and a tint (TINT) value of 110 to 140. .

The rubber composition for tire tread may further include a disulfide-based silane coupling agent having a sulfur content of 15 wt% to 20 wt% and a weight average molecular weight of 480 g/mol to 520 g/mol. .

The soybean oil may have a specific gravity of 0.91 to 0.925, an iodine value of 110 to 160, and a saponification value of 165 to 210.

According to another embodiment of the present invention, there is provided a tire manufactured using the rubber composition for a tire tread.

The rubber composition for a tire tread of the present invention can improve low fuel consumption performance, braking performance on a wet road surface, and handling performance while minimizing the occurrence of a trade-off in tire wear performance.

Hereinafter, the present invention will be described in more detail.

The rubber composition for a tire tread according to an embodiment of the present invention comprises 100 parts by weight of a raw material rubber comprising 50 parts by weight to 90 parts by weight of natural rubber and 10 parts by weight to 50 parts by weight of continuous solution polymerization styrene-butadiene rubber, and highly dispersible silica. 5 parts by weight to 50 parts by weight and a reinforcing filler including 5 parts by weight to 50 parts by weight of carbon black, and 2 parts by weight to 30 parts by weight of soybean oil.

The rubber composition for tire tread is made of natural rubber with synthetic rubber and silica as a filler for the purpose of improving low fuel efficiency, braking performance and handling performance on wet road surfaces while minimizing the occurrence of a trade-off in tire wear performance. It is partially applied to improve rolling resistance, wet road braking force, and handling performance, and to balance wear performance by applying natural oil.

The raw rubber may include natural rubber and solution-polymerized styrene-butadiene rubber.

The natural rubber may be a general natural rubber or a modified natural rubber. As the general natural rubber, any known natural rubber may be used, and the country of origin is not limited. The natural rubber mainly includes cis-1,4-polyisoprene, but may also include trans-1,4-polyisoprene according to required properties. Therefore, in the natural rubber, in addition to natural rubber containing cis-1,4-polyisoprene as a main component, natural rubber containing trans-1,4-isoprene as a main component, such as Valata, a type of rubber of the Sapotaceae family from South America, as a main component It may also include rubber.

The natural rubber may be included in an amount of 50 to 90 parts by weight based on 100 parts by weight of the raw rubber. When the natural rubber is included in an amount of less than 50 parts by weight, the natural properties of natural rubber having a crystallization structure may be insignificant, and when it exceeds 90 parts by weight, it may be disadvantageous in terms of compatibility with synthetic rubber.

The solution-polymerized styrene-butadiene rubber used at the same time has a styrene content of 10 wt% to 60 wt%, a vinyl content in butadiene of 10 wt% to 70 wt%, and a glass transition temperature (Tg) of -70 ° C to -40 ℃, the weight average molecular weight is 400,000 g / mol to 1,500,000 g / mol, the molecular weight distribution is 3.0 or less, it may be prepared by a continuous method. When the styrene-butadiene rubber having the above characteristics is used, the hysteresis of the tire tread increases, so it is advantageous for braking force and handling on a wet road surface.

The continuous solution polymerization styrene-butadiene rubber may be included in an amount of 10 to 50 parts by weight based on 100 parts by weight of the raw rubber. When the content of the continuous solution polymerization styrene-butadiene rubber is out of the above range, the purpose of the present invention is to minimize the occurrence of a trade-off in tire wear performance, and to improve low fuel efficiency, braking performance on a wet road surface, and handling performance. can be difficult to achieve.

As described above, the tire tread rubber composition includes a constant amount of continuous solution polymerization styrene-butadiene rubber having a glass transition temperature (Tg) advantageous for handling and braking force on a wet road with natural rubber advantageous for durability and abrasion performance, and a reinforcing filler The furnace is a combination of carbon black and silica in order to improve rolling resistance and braking power on a partly wet road surface and at the same time minimize the wear performance trade-off.

Specifically, in order to improve the wet road braking force and handling performance of the tire, synthetic rubber and silica having excellent grip performance are used. However, in the case of a rubber composition containing silica and synthetic rubber having a higher glass transition temperature (Tg) than natural rubber, it is generally difficult to apply as a tire tread for truck-bus because there is a concern about deterioration of abrasion resistance. Therefore, it is necessary to optimize the content of the overall filler and the carbon black/silica ratio.

The highly dispersible silica may be included in an amount of 5 to 50 parts by weight, specifically 20 to 50 parts by weight, based on 100 parts by weight of the raw rubber. When the content of the highly dispersible silica is less than 5 parts by weight based on 100 parts by weight of the raw rubber, the wet road braking performance effect may be insignificant, and if it exceeds 50 parts by weight, there may be a problem in silica dispersion.

The carbon black may be included in an amount of 5 parts by weight to 50 parts by weight, specifically, in an amount of 10 parts by weight to 40 parts by weight based on 100 parts by weight of the raw rubber. If the content of the carbon black is less than 5 parts by weight based on 100 parts by weight of the raw rubber, there may be problems in wear and reinforcement, and if it exceeds 50 parts by weight, there may be problems in dispersion and heat generation performance.

The silica has a nitrogen adsorption specific surface area (nitrogen surface area per gram, N ₂ SA) of 160 m / g to 180 m / g, and a CTAB value of 150 m / g to to obtain a tread rubber composition suitable for the purpose of the present invention. 170 m 2 /g, DBP (n-dibutyl phthalate) may be a highly dispersible silica having an oil absorption of 180 cc/100g to 200 cc/100g.

The rubber composition for a tire tread may further use a silane coupling agent to further improve dispersibility of the silica. The silane coupling agent may be a disulfide-based silane coupling agent having a sulfur content of 15 wt% to 20 wt% and a weight average molecular weight of 480 g/mol to 520 g/mol. When a silane coupling agent having these characteristics is used, thermal stability is high, which is advantageous when mixing.

The carbon black may have an iodine adsorption value of 60 mg/g to 120 mg/g, an n-dibutyl phthalate (DBP) oil absorption of 100 cc/100g to 160 cc/100g, and a tint (TINT) value of 110 to 140. . When carbon black having these characteristics is used, it is advantageous to improve the heat generation and wear performance of the compound.

On the other hand, the rubber composition for tire tread compensates for the wear performance deteriorated due to the silica by applying natural oil. Specifically, if the process oil applied for processability and dispersion of the reinforcing filler is replaced with eco-friendly soybean oil, the tread wear and cutting resistance caused by the non-aromatic type process oil decreases and It is possible to compensate for the same other physical properties and improve the heat generation performance by reducing the glass transition temperature (Tg).

The soybean oil may have a specific gravity of 0.91 to 0.925, an iodine value of 110 to 160, and a saponification value of 165 to 210. When soybean oil having these characteristics is used, it is advantageous for effective dispersion without trade-offs in other performance.

In addition, the soybean oil may be included in an amount of 2 parts by weight to 30 parts by weight based on 100 parts by weight of the raw rubber, and specifically, it may be included in an amount of 2 parts by weight to 10 parts by weight. If the content of soybean oil is less than 2 parts by weight based on 100 parts by weight of the raw rubber, dispersion may not be effective, and if it exceeds 30 parts by weight, the tear strength of the compound may be significantly reduced.

The rubber composition for tire tread may optionally further include various additives such as an additional vulcanizing agent, vulcanization accelerator, vulcanization accelerator, and anti-aging agent. Any of the above various additives may be used as long as they are commonly used in the field to which the present invention pertains, and their content is not particularly limited as it depends on a compounding ratio used in a conventional rubber composition for a tire tread.

As the vulcanizing agent, a sulfur-based vulcanizing agent may be preferably used. The sulfur-based vulcanizing agent is an inorganic vulcanizing agent such as powdered sulfur (S), insoluble sulfur (S), precipitated sulfur (S), colloidal sulfur, tetramethylthiuram disulfide (TMTD), tetraethyl An organic curing agent such as tetraethyltriuram disulfide (TETD) or dithiodimorpholine may be used. As the sulfur vulcanizing agent, specifically elemental sulfur or a vulcanizing agent for generating sulfur, for example, amine disulfide, polymeric sulfur, etc. may be used.

It is preferable that the vulcanizing agent be included in an amount of 0.5 to 2.0 parts by weight based on 100 parts by weight of the raw rubber in terms of making the raw rubber less sensitive to heat and chemically stable as an appropriate vulcanizing effect.

The vulcanization accelerator refers to an accelerator that promotes a vulcanization rate or a delayed action in the initial vulcanization stage.

Examples of the vulcanization accelerator include sulfenamide-based, thiazole-based, thiuram-based, thiourea-based, guanidine-based, dithiocarbamic acid-based, aldehyde-amine-based, aldehyde-ammonia-based, imidazoline-based, xanthate-based and their Any one selected from the group consisting of combinations may be used.

Examples of the sulfenamide-based vulcanization accelerator include N-cyclohexyl-2-benzothiazylsulfenamide (CBS), N-tert-butyl-2-benzothiazylsulfenamide (TBBS), N,N-dicyclohexyl Any one selected from the group consisting of -2-benzothiazylsulfenamide, N-oxydiethylene-2-benzothiazylsulfenamide, N,N-diisopropyl-2-benzothiazolesulfenamide, and combinations thereof of sulfenamide compounds may be used.

Examples of the thiazole-based vulcanization accelerator include 2-mercaptobenzothiazole (MBT), dibenzothiazyldisulfide (MBTS), sodium salt of 2-mercaptobenzothiazole, zinc salt of 2-mercaptobenzothiazole. , copper salt of 2-mercaptobenzothiazole, cyclohexylamine salt of 2-mercaptobenzothiazole, 2-(2,4-dinitrophenyl)mercaptobenzothiazole, 2-(2,6-di Any one thiazole-based compound selected from the group consisting of ethyl4-morpholinothio)benzothiazole and combinations thereof may be used.

Examples of the thiuram-based vulcanization accelerator include tetramethylthiuram disulfide (TMTD), tetraethylthiuram disulfide, tetramethylthiuram monosulfide, dipentamethylenethiuram disulfide, dipentamethylenethiuram monosulfide, dipentamethylene Any one thiuram-based compound selected from the group consisting of thiuram tetrasulfide, dipentamethylene thiuram hexasulfide, tetrabutyl thiuram disulfide, pentamethylene thiuram tetrasulfide, and combinations thereof may be used.

The thiourea-based vulcanization accelerator is, for example, any one selected from the group consisting of thiacarbamide, diethylthiourea, dibutylthiourea, trimethylthiourea, diorthotolylthiourea, and combinations thereof. compounds may be used.

As the guanidine-based vulcanization accelerator, for example, any one guanidine-based compound selected from the group consisting of diphenylguanidine, diorthotolylguanidine, triphenylguanidine, orthotolylbiguanide, diphenylguanidinephthalate, and combinations thereof may be used. can

Examples of the dithiocarbamic acid-based vulcanization accelerator include zinc ethylphenyldithiocarbamate, zinc butylphenyldithiocarbamate, sodium dimethyldithiocarbamate, zinc dimethyldithiocarbamate, zinc diethyldithiocarbamate, Zinc dibutyldithiocarbamate, zinc diamyldithiocarbamate, zinc dipropyldithiocarbamate, complex salt of zinc pentamethylenedithiocarbamate and piperidine, hexadecylisopropyldithiocarbamate zinc, octadecyl Zinc isopropyldithiocarbamate, zinc dibenzyldithiocarbamate, sodium diethyldithiocarbamate, piperidine pentamethylenedithiocarbamate, selenium dimethyldithiocarbamate, tellunium diethyldithiocarbamate, dia Any one dithiocarbamic acid-based compound selected from the group consisting of cadmium mildithiocarbamate and combinations thereof may be used.

The aldehyde-amine-based or aldehyde-ammonia-based vulcanization accelerator is, for example, an aldehyde selected from the group consisting of acetaldehyde-aniline reactants, butylaldehyde-aniline condensates, hexamethylenetetramine, acetaldehyde-ammonia reactants, and combinations thereof. -Amine-based or aldehyde-ammonia-based compounds may be used.

As the imidazoline-based vulcanization accelerator, for example, an imidazoline-based compound such as 2-mercaptoimidazoline can be used. compounds may be used.

The vulcanization accelerator may be included in an amount of 1.0 to 2.5 parts by weight based on 100 parts by weight of the raw rubber in order to maximize productivity and rubber properties through acceleration of the vulcanization rate.

The vulcanization accelerator is a compounding agent used in combination with the vulcanization accelerator to perfect the accelerating effect, and any one selected from the group consisting of an inorganic vulcanization accelerator, an organic vulcanization accelerator, and combinations thereof may be used. .

As the inorganic vulcanization accelerator, any one selected from the group consisting of zinc oxide (ZnO), zinc carbonate, magnesium oxide (MgO), lead oxide, potassium hydroxide, and combinations thereof can be used. there is. The organic-based vulcanization accelerator is selected from the group consisting of stearic acid, zinc stearate, palmitic acid, linoleic acid, oleic acid, lauric acid, dibutyl ammonium oleate, derivatives thereof, and combinations thereof. Any one can be used.

In particular, the zinc oxide and the stearic acid can be used together as the vulcanization accelerator, and in this case, the zinc oxide is dissolved in the stearic acid to form an effective complex with the vulcanization accelerator to release advantageous sulfur during the vulcanization reaction It facilitates the crosslinking reaction of rubber by making it.

When the zinc oxide and the stearic acid are used together, 1 to 5 parts by weight and 0.5 to 3.0 parts by weight based on 100 parts by weight of the raw rubber, respectively, to serve as an appropriate vulcanization accelerator.

The antioxidant is an additive used to stop the chain reaction in which the tire is automatically oxidized by oxygen. As the antioxidant, any one selected from the group consisting of amine-based, phenol-based, quinoline-based, imidazole-based, carbamic acid metal salts, waxes, and combinations thereof may be appropriately selected and used.

The amine-based antioxidants include N-phenyl-N'-(1,3-dimethyl)-p-phenylenediamine, N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine ( 6PPD), N-phenyl-N'-isopropyl-p-phenylenediamine (3PPD), N,N'-diphenyl-p-phenylenediamine, N,N'-diaryl-p-phenylenediamine, Any one selected from the group consisting of N-phenyl-N'-cyclohexyl p-phenylenediamine, N-phenyl-N'-octyl-p-phenylenediamine, and combinations thereof may be used. The phenolic antioxidants include phenolic 2,2'-methylene-bis(4-methyl-6-tert-butylphenol), 2,2'-isobutylidene-bis(4,6-dimethylphenol), 2 Any one selected from the group consisting of ,6-di-t-butyl-p-cresol and combinations thereof may be used. As the quinoline-based antioxidant, 2,2,4-trimethyl-1,2-dihydroquinoline and its derivatives may be used, and specifically, 6-ethoxy-2,2,4-trimethyl-1,2-di consisting of hydroquinoline, 6-anilino-2,2,4-trimethyl-1,2-dihydroquinoline, 6-dodecyl-2,2,4-trimethyl-1,2-dihydroquinoline, and combinations thereof Any one selected from the group may be used. Preferably, waxy hydrocarbon may be used as the wax.

In addition to the anti-aging action, the antioxidant should have high solubility in rubber, low volatility, inert rubber, and not inhibit vulcanization. It may be included in parts by weight.

A tire according to another embodiment of the present invention is manufactured using the rubber composition for a tire tread. Any method for manufacturing a tire using the rubber composition for a tire tread can be applied as long as it is a method conventionally used for manufacturing a tire, and a detailed description thereof will be omitted herein.

The tire may be a truck tire or a bus tire, but the present invention is not limited thereto, and the tire may be a light truck radial (LTR) tire, an ultra-high performance (UHP) tire, a racing tire, or off-the -road) tires, passenger car tires, airplane tires, agricultural machinery tires, and the like. In addition, the tire may be a radial tire or a bias tire, preferably a radial tire.

In addition, the rubber composition for the tire tread is not limited to the tread (tread cap and tread base) of the tire, and may be made of various rubber components constituting the tire. The rubber component may include a sidewall, a sidewall insert, an apex, a chafer, a wire coat or an inner liner.

Hereinafter, embodiments of the present invention will be described in detail so that those of ordinary skill in the art can easily carry out the present invention. However, the present invention may be embodied in several different forms and is not limited to the embodiments described herein.

[Preparation Example: Preparation of rubber composition]

Using the compositions shown in Table 1 below, tire rubber compositions according to Examples and Comparative Examples were prepared according to a conventional tire manufacturing method.

division Comparative Example 1 Comparative Example 2 Comparative Example 3 Example 1 Example 2 Example 3 natural rubber 100 80 80 80 80 80 Solution-polymerized styrene-butadiene rubber ¹⁾ - 20 20 20 20 20 Silica ²⁾ - 55 55 55 30 15 coupling agent ⁴⁾ - 5 5 5 2.5 One carbon black ³⁾ 50 - - - 25 40 Non-aromatic petroleum oil ⁵⁾ - - 5 - - - soybean oil ⁶⁾ - - - 5 5 5 zinc oxide 3 3 3 3 3 3 stearic acid 1.5 1.5 1.5 1.5 1.5 1.5 brimstone 1.8 1.8 1.8 1.8 1.8 1.8 accelerant 1.6 1.6 1.6 1.6 1.6 1.6

1) Solution-polymerized styrene-butadiene rubber: solution-polymerized styrene-butadiene rubber prepared by a continuous method, styrene content 26% by weight, vinyl content in butadiene 19% by weight, glass transition temperature -53° C., weight average molecular weight 400,000 g/mol , molecular weight distribution 2.19

2) Silica: highly dispersible precipitated silica with CTAB 160 m ² /g, N ₂ SA 175 m ² /g

3) Carbon black: iodine adsorption value 115 mg/g, DBP oil absorption 135cc/100g, tint (TINT) 120%

4) Coupling agent: a disulfide-based silane coupling agent having a sulfur content of 16 wt% and a weight average molecular weight of 485 g/mol

5) Non-aromatic petroleum oil: TDAE (treated distillate aromatic extracts) oil

6) Soybean oil: Soybean oil with a specific gravity of 0.91, an iodine value of 130, and a saponification value of 191

[Experimental Example: Measurement of Physical Properties of the Prepared Rubber Composition]

The physical properties of the rubber composition prepared in Preparation Example were measured according to ASTM regulations, and the results are shown in Table 2 below. In Table 2 below, the figure of merit was evaluated by manufacturing according to the 315/70R22.5 standard for trucks.

Properties Comparative Example 1 Comparative Example 2 Comparative Example 3 Example 1 Example 2 Example 3 mixed machinability
(Mooney viscosity) ¹⁾ 60 80 70 70 62 59 hardness ²⁾ 65 72 70 72 71 70 300% modulus 179 181 170 172 174 175 LRR performance index ³⁾ 100 103 101 104 103 100 Wet performance index 100 115 112 112 110 105 wear resistance performance index 100 85 83 86 89 90

1) Mooney viscosity: This is an indicator of machinability. The smaller the number, the better the machinability.

2) The higher the hardness, the better the handling.

3) Wet performance, LRR performance, and abrasion resistance performance index is an index value shown based on 100 in Example, and the larger the number, the more advantageous.

Referring to Table 2, in Examples 1 to 3 to which silica and soybean oil were simultaneously applied, LRR performance and wet grip performance were improved compared to Comparative Examples 1 to 3, and processability due to silica application, It can be seen that the deterioration of the wear performance was compensated. In addition, in Examples 1 to 3, it can be seen that the handling performance was also improved due to the improvement in hardness compared to Comparative Example 1.

In particular, in the case of Example 2, compared to Examples 1 and 3, it can be seen that workability, hardness, LRR performance, wet grip performance, and wear performance are generally balanced.

Although preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements by those skilled in the art using the basic concept of the present invention as defined in the following claims are also provided. is within the scope of the

Claims (6)

100 parts by weight of raw rubber comprising 50 parts by weight to 90 parts by weight of natural rubber and 10 parts by weight to 50 parts by weight of continuous solution polymerization styrene-butadiene rubber;
A reinforcing filler comprising 5 to 50 parts by weight of highly dispersible silica and 5 to 50 parts by weight of carbon black, and
2 parts by weight to 30 parts by weight of soybean oil,
It contains a disulfide-based silane coupling agent having a sulfur content of 15 wt% to 20 wt%, and a weight average molecular weight of 480 g/mol to 520 g/mol,
The continuous solution polymerization styrene-butadiene rubber has a styrene content of 10 wt% to 60 wt%, a vinyl content in butadiene of 10 wt% to 70 wt%, and a glass transition temperature (Tg) of -70 °C to -40 °C and a weight average molecular weight of 400,000 g/mol to 1,500,000 g/mol, and a molecular weight distribution of 3.0 or less.
delete The method of claim 1,
The carbon black has an iodine adsorption value of 60 mg/g to 120 mg/g, an n-dibutyl phthalate (DBP) oil absorption of 100 cc/100g to 160 cc/100g, and a tint (TINT) value of 110 to 140 A rubber composition for a tire tread.
delete The method of claim 1,
The rubber composition for a tire tread, wherein the soybean oil has a specific gravity of 0.91 to 0.925, an iodine value of 110 to 160, and a saponification value of 165 to 210.
A tire manufactured by using the rubber composition for a tire tread according to any one of claims 1, 3 and 5.