KR102017319B1 - Rubber composition for tire tread and studded tire manufactured by using the same - Google Patents

Abstract

The present invention comprises 100 parts by weight of the raw material rubber, 40 to 60 parts by weight of carbon black and 1 to 10 parts by weight of the terpene-based resin, the terpene-based resin composition for tire tread containing limonene (Limonene) or phenol and using the same The tire composition of the present invention is a tire tread, and the rubber composition for tread includes a terpene-based resin, thereby providing a tire having improved chip-cut performance.

Description

RUBBER COMPOSITION FOR TIRE TREAD AND STUDDED TIRE MANUFACTURED BY USING THE SAME}

The present invention relates to a rubber composition for tire treads with improved chip-cut performance and a tire manufactured using the same.

Existing off-road trucks, light trucks, passenger cars and off-road racing cars have a low chip-cut performance, which may cause a drastic reduction in wear resistance and durability during off-road driving. This results in a drop in the overall performance of the tire when running.

Previously, in order to improve chip cut performance, methods such as increasing carbon black filling amount, reducing oil usage, or increasing reinforcement resin have been used. However, in the increase or decrease method, the change in physical properties increases, especially when driving at high speeds in off-road conditions, the chip cut shape proceeds at a high speed, causing durability and abrasion deterioration problems and difficulty in running.

As described above, it is necessary to develop a tire having excellent durability, abrasion resistance, chip cut performance, and grip performance so as to overcome the problems of the prior art and to drive for a long time in off-road conditions on rough roads.

It is an object of the present invention to provide a rubber composition for tire treads with improved chip cut performance.

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

The present invention comprises 100 parts by weight of raw rubber, 40 to 60 parts by weight of carbon black and 1 to 10 parts by weight of terpene resin, wherein the terpene resin comprises limonene (Limonene) or a phenol rubber composition for treads to provide.

The terpene-based resin may have a weight average molecular weight of 500 to 5,000 g / mol.

The terpene-based resin may be a softening point of 90 to 150 ℃.

The tire tread rubber composition is based on 100 parts by weight of the raw material rubber, 0.5 to 5.0 parts by weight of vulcanizing agent, 0.5 to 5.0 parts by weight of vulcanization accelerator, 1 to 5 parts by weight of zinc oxide, 0.5 to 1.5 parts by weight of stearic acid, softener 1 To 50 parts by weight and may be a further comprising 0.1 to 10 parts by weight of the antioxidant.

The present invention also provides a tire manufactured using the rubber composition for tread.

The present invention can provide a rubber composition for tire treads with improved tire chip cut performance.

The present invention can also provide a tire comprising the rubber composition for the tire tread.

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

The rubber composition for tire treads according to an embodiment of the present invention includes 100 parts by weight of raw rubber, 40 to 60 parts by weight of carbon black, and 1 to 10 parts by weight of terpene resin, and the terpene resin is limonene or phenol. It provides a rubber composition for a tire tread comprising a.

The raw rubber may be any one selected from the group consisting of natural rubber, synthetic rubber, and combinations thereof.

The natural rubber may be general natural rubber or modified natural rubber.

The general natural rubber may be used as long as it is known as natural rubber, and the origin and the like are not limited. The natural rubber contains cis-1,4-polyisoprene as a main agent, but may also include trans-1,4-polyisoprene depending on the required properties. Therefore, the natural rubber includes, in addition to the natural rubber containing cis-1,4-polyisoprene as a main agent, for example, a natural containing trans-1,4-isoprene as a main agent such as a balata, which is a kind of rubber of South American sapotagua. Rubber may also be included.

The modified natural rubber means a modified or refined general natural rubber. For example, the modified natural rubber may include epoxidized natural rubber (ENR), deproteinized natural rubber (DPNR), hydrogenated natural rubber, and the like.

Synthetic rubber is styrene butadiene rubber (SBR), modified styrene butadiene rubber, butadiene rubber (BR), modified butadiene rubber, chloro sulfonated polyethylene rubber, epichlorohydrin rubber, fluorine rubber, silicone rubber, nitrile rubber, hydrogenated Nitrile Rubber, Nitrile Butadiene Rubber (NBR), Modified Nitrile Butadiene Rubber, Chlorinated Polyethylene Rubber, Styrene Ethylene Butylene Styrene (SEBS) Rubber, Ethylene Propylene Rubber, Ethylene Propylene Diene (EPDM) Rubber, Hypalon Rubber, Chloroprene Rubber, Ethylene vinyl acetate rubber, acrylic rubber, hydrin rubber, vinyl benzyl chloride styrene butadiene rubber, bromo methyl styrene butyl rubber, maleic acid styrene butadiene rubber, carboxylic acid styrene butadiene rubber, epoxy isoprene rubber, maleic acid ethylene propylene rubber, carboxylic acid Nitrile Butadiene High It may be a p-methyl styrene (brominated polyisobutyl isoprene-co-paramethyl styrene, BIMS), and one selected from the group consisting of -, bromo mineyi suited polyisobutyl isoprene-co.

The carbon black may have an iodine adsorption specific surface area of 110 to 150 m 2 / g, and an oil adsorber (OAN) of 120 to 150 m 2 / g, but the present invention is not limited thereto.

Representative examples of the carbon black are N110, N121, N134, N220, N231, N234, N242, N293, N299, S315, N326, N330, N332, N339, N343, N347, N351, N358, N375, N539, N550, N582 , N630, N642, N650, N683, N754, N762, N765, N774, N787, N907, N908, N990 or N991, and SAF, ISAF, HAF, MAF, FEF, SRF, GPF, APF, FF, Furnace blacks (furnace carbon black) such as CF, SCF and ECF; Acetylene black (acetylene carbon black); Thermal blacks (thermal carbon blacks) such as FT and MT; Channel blacks (channel carbon blacks) such as EPC, MPC and CC; Graphite and the like. These can be used 1 type or in combination or 2 or more types.

The carbon black may be included in an amount of 30 to 80 parts by weight based on 100 parts by weight of the raw material rubber, and preferably 40 to 60 parts by weight. When the content of the carbon black is less than 40 parts by weight, the reinforcing performance by the carbon black as a filler may be reduced, and when the content of the carbon black exceeds 60 parts by weight, the processability of the rubber composition may be deteriorated.

The present invention can improve the chip cut performance of a tire by using a terpene-based resin containing limonene or phenol as a reinforcing agent.

Chip-cut performance means that the rubber that forms the tire tread is damaged, and it is as if the rubber is cut on the blade due to contact with various sharp materials such as cracked stones or glass fragments. It is a cracking phenomenon.

Conventional tire rubber compositions have used C9 or C5 hydrocarbon resins to improve chip cut performance. However, the hydrocarbon-based resin may improve chip cut performance, but there is a problem in that other physical properties decrease.

According to the present invention, terpene-based resins containing limonene or phenol can be used to maintain other physical properties while improving the efficiency of chip cut performance, thereby preventing a trade-off phenomenon. The terpene-based resin is also excellent in adhesion (Tack, Tackifier) can omit additives such as tackifiers can provide an environment-friendly product.

The terpene resin may have a weight average molecular weight of 500 to 5,000 g / mol, and the terpene resin may have a softening point of 90 to 150 ° C.

Limonene is a terpene having two repeated isoprene units, classified as an aromatic terpene having a strong citrus odor, and may be d-limonene or l-limonene.

The terpene-based resin including the limonene may be one in which a limonene monomer is included in the terminal or main chain of the polymer chain by a method such as copolymerization, coupling, and substitution.

Terpene-based resin containing the phenol may also be included in the terminal or main chain of the polymer chain by a method such as copolymerization, coupling, substitution.

The terpene-based resin containing limonene or phenol may be included in an amount of 1 to 10 parts by weight based on 100 parts by weight of the raw material rubber, and when mixed under the above conditions, chip cut performance and fuel efficiency may be improved.

The tire rubber composition may optionally further include various additives such as additional vulcanizing agents, vulcanization accelerators, vulcanization accelerators, softeners, anti-aging agents, and activators. The various additives can be used as long as it is commonly used in the field of the present invention, the content thereof is not particularly limited, depending on the compounding ratio used in the conventional rubber composition for tires.

As the vulcanizing agent, metal oxides such as sulfur-based vulcanizing agents, organic peroxides, resin vulcanizing agents, and magnesium oxide may be used.

The sulfur-based vulcanizing agents include inorganic vulcanizing agents such as powdered sulfur (S), insoluble sulfur (S), precipitated sulfur (S) and colloidal sulfur, tetramethylthiuram disulfide (TMTD) and tetraethyl. Organic vulcanizing agents such as tetraethyltriuram disulfide (TETD) and dithiodimorpholine may be used, and sulfur containing naphthenic oil may be used.

Specifically, as a sulfur vulcanizing agent, a vulcanizing agent for producing elemental sulfur or sulfur, for example, amine disulfide, polymer sulfur, and the like can be used.

The organic peroxide may be benzoyl peroxide, dicumyl peroxide, di-t-butyl peroxide, t-butyl cumyl peroxide, methyl ethyl ketone peroxide, cumene hydroperoxide, 2,5-dimethyl-2,5-di ( t-butylperoxy) hexane, 2,5-dimethyl-2,5-di (benzoylperoxy) hexane, 2,5-dimethyl-2,5-di (t-butylperoxy) hexane, 1,3- Bis (t-butylperoxypropyl) benzene, di-t-butylperoxy-diisopropylbenzene, t-butylperoxybenzene, 2,4-dichlorobenzoyl peroxide, 1,1-dibutylperoxy-3 Any one selected from the group consisting of, 3,5-trimethylsiloxane, n-butyl-4,4-di-t-butylperoxyvalerate and combinations thereof can be used.

The vulcanizing agent is preferably included in an amount of 0.5 to 5.0 parts by weight based on 100 parts by weight of the raw material rubber, in that the raw material rubber is less sensitive to heat and chemically stable.

The vulcanization accelerator refers to an accelerator that promotes the rate of vulcanization or promotes delay in the initial vulcanization stage.

The vulcanization accelerators include sulfenamide, thiazole, thiuram, thiourea, guanidine, dithiocarbamic acid, aldehyde-amine, aldehyde-ammonia, imidazoline, xanthate and their Any one selected from the group consisting of a combination can be used.

Examples of the sulfenamide vulcanization accelerators include N-cyclohexyl-2-benzothiazylsulfenamide (CBS), N-tert-butyl-2-benzothiazylsulfenamide (TBBS), and N, N-dicyclohexyl. Any selected from the group consisting of -2-benzothiazylsulfenamide, N-oxydiethylene-2-benzothiazylsulfenamide, N, N-diisopropyl-2-benzothiazolesulfenamide and combinations thereof The sulfenamide type compound of can be used.

Examples of the thiazole vulcanization accelerators include 2-mercaptobenzothiazole (MBT), dibenzothiazyl disulfide (MBTS), sodium salt of 2-mercaptobenzothiazole and 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 thiazole compound selected from the group consisting of ethyl 4-morpholinothio) benzothiazole and combinations thereof can be used.

Examples of the thiuram-based vulcanization accelerators include tetramethyl thiuram disulfide (TMTD), tetraethyl thiuram disulfide, tetramethyl thiuram monosulfide, dipentamethylene thiuram disulfide, dipentamethylene thiuram monosulfide and dipentamethylene. Any thiuram-based compound selected from the group consisting of thiuram tetrasulfide, dipentamethylene thiuram hexasulfide, tetrabutyl thiuram disulfide, pentamethylene thiuram tetrasulfide, and combinations thereof can be used.

As the thiourea vulcanization accelerator, for example, thiocarbamide, diethylthiourea, dibutylthiourea, trimethylthiourea, diorthotolylthiourea, and any combination thereof is selected from the group of thiourea Compounds can 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, diphenylguanidine phthalate, and combinations thereof can be used. Can be.

Examples of the dithiocarbamic acid-based vulcanization accelerators include ethylphenyldithiocarbamate zinc, butylphenyldithiocarbamate zinc, sodium dimethyldithiocarbamate, zinc dimethyldithiocarbamate, zinc diethyldithiocarbamate, Zinc dibutyldithiocarbamate, zinc diamyldithiocarbamate, zinc dipropyldithiocarbamate, zinc salt of pentamethylenedithiocarbamate and piperidine, hexadecylisopropyldithiocarbamate zinc, octadecyl Isopropyldithiocarbamate zinc dibenzyldithiocarbamate zinc, sodium diethyldithiocarbamate, pentamethylenedithiocarbamate piperidine, dimethyldithiocarbamate selenium, diethyldithiocarbamate tellurium, dia One dithiocarbamic acid compound selected from the group consisting of cadmium didicarbamate and combinations thereof can be used.

The aldehyde-amine-based or aldehyde-ammonia based vulcanization accelerator, for example, acetaldehyde-aniline reactant, butylaldehyde-aniline condensate, hexamethylenetetramine, acetaldehyde-ammonia reactant and combinations thereof -Amine based or aldehyde-ammonia based compounds can be used.

As said imidazoline type vulcanization accelerator, imidazoline type compounds, such as 2-mercaptoimidazoline, can be used, for example, As said xanthate type vulcanization accelerator, xanthate type, such as zinc dibutyl xanthogenate Compounds can be used.

The vulcanization accelerator may be included in an amount of 0.5 to 5.0 parts by weight based on 100 parts by weight of the raw material rubber in order to maximize productivity and rubber properties by promoting the vulcanization rate.

The vulcanization accelerator is a compounding agent used in combination with the vulcanization accelerator to complete its promoting effect. Any one selected from the group consisting of inorganic vulcanization accelerators, organic vulcanization accelerators and combinations thereof can be used. .

The inorganic vulcanization accelerator may be any one selected from the group consisting of zinc oxide (ZnO), zinc carbonate, magnesium oxide (MgO), lead oxide, potassium hydroxide, and combinations thereof. have. The organic 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. You can use either one.

In particular, the zinc oxide and the stearic acid may be used together as the vulcanization accelerator, in which case the zinc oxide is dissolved in the stearic acid to form an effective complex with the vulcanization accelerator, thereby releasing advantageous sulfur during the vulcanization reaction. It facilitates the crosslinking reaction of the rubber.

When using the zinc oxide and the stearic acid together may be used in 0.5 to 5 parts by weight and 0.5 to 1.5 parts by weight with respect to 100 parts by weight of the raw material rubber for the role as a suitable vulcanization accelerator. When the content of zinc oxide and the stearic acid is less than the above range, the vulcanization rate may be low, and productivity may be lowered. When the zinc oxide and the stearic acid are below the above range, a scorch phenomenon may occur and the physical properties may be reduced.

The softener is added to the rubber composition to impart plasticity to the rubber to facilitate processing or to lower the hardness of the vulcanized rubber, and refers to oils and other materials used in rubber compounding or rubber production. The softener may be any one selected from the group consisting of petroleum oil, vegetable oil and combinations thereof, but the present invention is not limited thereto.

The petroleum oil may be any one selected from the group consisting of paraffinic oil, naphthenic oil, aromatic oil, and combinations thereof.

Representative examples of the paraffinic oil include P-1, P-2, P-3, P-4, P-5, and P-6 of Michang Oil, Inc. A representative example of the naphthenic oil is Michang oil. N-1, N-2, N-3, etc. of the corporation | Co., Ltd. are mentioned, As a representative example of the said aromatic oil, A-2, A-3, etc. of Michang Oil Corporation are mentioned.

However, it is known that cancer is more likely to occur when the content of polycyclic aromatic hydrocarbons (hereinafter referred to as “PAHs”) contained in the aromatic oil is 3% by weight or more with the recent increase of environmental awareness. Treated distillate aromatic extract (TDAE) oil, mild extraction solvate (MES) oil, residual aromatic extract (RAE) oil or heavy naphthenic oil can be preferably used.

In particular, the oil used as the softener has a total content of PAHs component of 3% by weight or less, a kinematic viscosity of 95 or more (210 ° F. SUS), an aromatic component in the softener of 15 to 25% by weight, naphthenic components TDAE oils having 27 to 37% by weight and 38 to 58% by weight of the paraffinic component can be preferably used.

The TDAE oil is advantageous in terms of environmental factors such as the low temperature characteristics of the tire tread including the TDAE oil, fuel efficiency, and the likelihood of causing cancer of PAHs.

The plant oils include castor oil, cottonseed oil, linseed oil, canola oil, soybean oil, palm oil, palm oil, peanut oil, pine oil, pine tar, tall oil, corn oil, rice bran oil, safflower oil, sesame oil, olive oil, sunflower oil, palm kernel oil, camellia oil It may be used any one selected from the group consisting of jojoba oil, macadamia nut oil, saflower flower oil, tung oil and combinations thereof.

The softener is preferably used in an amount of 1 to 50 parts by weight based on 100 parts by weight of the raw material rubber, in terms of improving processability of the raw material rubber.

The anti-aging agent is an additive used to stop the chain reaction in which the tire is automatically oxidized by oxygen. As the anti-aging agent, 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.

Examples of the amine antioxidant include N-phenyl-N '-(1,3-dimethyl) -p-phenylenediamine, N- (1,3-dimethylbutyl) -N'-phenyl-p-phenylenediamine, N-phenyl-N'-isopropyl-p-phenylenediamine, N, N'-diphenyl-p-phenylenediamine, N, N'-diaryl-p-phenylenediamine, N-phenyl-N ' Any one selected from the group consisting of -cyclohexyl p-phenylenediamine, N-phenyl-N'-octyl-p-phenylenediamine, and combinations thereof can be used.

The phenolic anti-aging agent is 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 can be used.

As the quinoline anti-aging agent, 2,2,4-trimethyl-1,2-dihydroquinoline and derivatives thereof may be used, and specifically 6-ethoxy-2,2,4-trimethyl-1,2-di 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 can be used.

Wax hydrocarbon may be preferably used as the wax.

Among the above compounds, considering the remarkable effect of the improvement of the use of anti-aging agent, N- (1,3-dimethylbutyl) -N'-phenyl-p-phenylenediamine, N-phenyl-N'-isopropyl more preferred is -p-phenylenediamine, poly (2.2.4-trimethyl-1,2-dihydroquinoline) or mixtures thereof.

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

The tire tread rubber composition may be prepared through a conventional two-step continuous manufacturing process. That is, during the finishing step in which the first step of thermomechanical treatment or kneading at a maximum temperature ranging from 110 to 190 ° C., preferably from 130 to 180 ° C. (called “non-production” step) and the crosslinking system are mixed, Typically can be prepared in a suitable mixer using a second step (called a "production" step) of mechanical treatment at a low temperature of less than 110 ° C, for example 40 to 100 ° C, but the invention is not limited thereto. .

Tire according to another embodiment of the present invention is to include a tread portion manufactured using the rubber tread rubber composition.

The method for manufacturing a tire including a tread portion using the tire tread rubber composition may be applied to any method used in the manufacture of tires in the related art, and thus, detailed description thereof will be omitted.

The tire may be a small truck tire (LTR) or a tire for a passenger car, but is not limited thereto.

Hereinafter, embodiments of the present invention will be described in detail so that those skilled in the art can easily practice the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

Preparation Example: Preparation of Rubber Composition

Using a composition as shown in Table 1 below to prepare a rubber composition for tire treads according to the following examples and comparative examples. The preparation of the rubber composition was in accordance with a conventional method for producing a rubber composition and is not particularly limited.

Comparative Example 1 Example 1 Example 2 Example 3 Comparative Example 2 Example 4 Example 5 Example 6 Natural rubber 100 100 100 100 100 100 100 100 Carbon black 50 50 50 50 50 50 50 50 Hydrocarbon C9 Resin 6 8 Terpene Resin 1 6 8 Terpene Resin 2 6 8 Terpene Resin 3 6 8 Zinc oxide 3 3 3 3 3 3 3 3 Stearic acid 2 2 2 2 2 2 2 2 Antioxidant 1 2 2 2 2 2 2 2 2 Antioxidant 2 One One One One One One One One Wax One One One One One One One One NS One One One One One One One One GS 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5

-Natural rubber: Po 30 ~ 40, PRI MIN 60, MV 80 ~ 90 (TSR-20 Grade)

-Carbon black: Carbon black with iodine adsorption specific surface area of 110 ~ 150 ㎡ / g, OAN of 120 ~ 150 ㎡ / g, Volatile Content value within 1 ~ 4%

Hydrocarbon C9 resin: softening point 80 ~ 120 ℃, specific gravity 0.8 ~ 1.0, weight average molecular weight 1,000 ~ 3,000 g / mol

-Terpene resin 1: terpene resin prepared by copolymerizing terpene monomer and limonene monomer (softening point 110 ~ 150 ℃, specific gravity 0.9 ~ 1.1, weight average molecular weight 500 ~ 2,000 g / mol)

-Terpene resin 2: terpene resin prepared by copolymerizing terpene monomer and phenol monomer (softening point 90 ~ 140 ℃, specific gravity 0.9 ~ 1.1, weight average molecular weight 500 ~ 2,000 g / mol)

-Terpene resin 3: High molecular weight terpene resin prepared by copolymerizing terpene monomer, limonene monomer and phenol monomer (softening point 90 ~ 160 ℃, specific gravity 0.8 ~ 1.0, weight average molecular weight 2,000 ~ 5,000 g / mol)

Antioxidant 1: N- (1,3-dimethylbutyl) -N'-phenyl-p-phenylenediamine (N- (1,3-Dimethybutyl) -N-phenyl-p-phenylenediamine, 6PPD)

Antioxidant 2: Poly (2,2,4-trimethyl-1,2-dihydroquinoline (RD)

Experimental Example: Measurement of Physical Properties of Prepared Rubber Composition

Using the rubber composition prepared in the above Examples and Comparative Examples and by detaching the tire constituting the tread portion to measure the physical properties and the results are shown in Table 2 below.

Comparative Example 1 Example 1 Example 2 Example 3 Comparative Example 2 Example 4 Example 5 Example 6 Hardness 67 64 64 62 65 61 62 63 300% modulus 128 130 131 132 121 124 125 127 Elongation (%) 522 520 532 525 553 578 580 565 Chip Cut Index 100 105 103 103 105 112 109 112 LRR Index 100 113 105 115 93 98 93 100

Hardness: Measured after 1 hour in a temperature-controlled combustion chamber by ASTM shore-A hardness tester

-300% modulus: 300% elongation from the strain-stress curve when the specimen is stretched by using a 100mm long, 25mm wide, 5mm inner width, and a 20mm long, 5mm wide specimen. Measured by checking the stress value at the time

Elongation: Elongation at break is measured by expressing the strain value in% until the test piece breaks in the tensile tester.

Chip Cut Index: Chip cut performance was measured and then indexed based on the measured value of Comparative Example 1.

-LRR Index: tanδ is Rδ (Rheo Dynamic Spectroscopy), tanδ = (G "/ G '), where G' is Viscous Modulus, G" is Elastic Modulus value Comparative Example 1 The value of is converted into an index value as a reference (100). 0 ° C tanδ represents braking characteristics on dry or wet roads. The higher the value, the better the braking performance. In addition, 60 ° C tan δ indicates rotational resistance characteristics, and a lower value indicates better performance.

Looking at Comparative Example 1 and Examples 1 to 3 containing 6 parts by weight of resin, Examples 1 to 3 (terpene type difference) using terpene resin compared to Comparative Example 1 using 6 parts by weight of hydrocarbon-based C9 resin While the value of shows overall favorable properties, the results of improving chip and cut performance and fuel efficiency were confirmed.

Among them, Example 1 using Limonene (terpene repeating two isoprene units) synthesized terpene-based resin products showed the best results, and high molecular weight (terpene-based resin) was used. It confirmed that Example 3 also showed a favorable result.

Looking at Comparative Example 2 and Examples 4 to 8 containing the resin by increasing the content to 8 parts by weight, the overall chip-cut performance tends to be improved, but the LRR performance was reduced.

The rubber composition for tire treads according to the present invention is considered to be more preferable in that it contains 6 parts by weight of resin, which can complement chip cut performance and LRR performance.

Although the 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 of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

Claims (5)

100 parts by weight of raw rubber,
40 to 60 parts by weight of carbon black and
1 to 10 parts by weight of terpene-based resin,
The terpene resin is prepared by copolymerizing a terpene monomer and a limonene monomer,
The raw material rubber is a rubber composition for tire tread that is a natural rubber. The method of claim 1,
The terpene-based resin has a weight average molecular weight of 500 to 5,000 g / mol rubber composition for a tire tread. The method of claim 1,
The terpene-based resin has a softening point of 90 to 150 ℃ rubber composition for tire tread. The method of claim 1,
The rubber composition for tire tread is 0.5 to 5.0 parts by weight of vulcanizing agent, 0.5 to 5.0 parts by weight of vulcanization accelerator, 1 to 5 parts by weight of zinc oxide, 0.5 to 1.5 parts by weight of stearic acid, softener 1 based on 100 parts by weight of the raw material rubber. The rubber composition for a tire tread further comprises from 50 parts by weight to 0.1 to 10 parts by weight of an antioxidant. A tire manufactured using the rubber composition for tire tread according to any one of claims 1 to 4.