KR101527860B1 - Rubber composition for carcass topping of tire and tire manufactured by using the same - Google Patents

Abstract

The present invention relates to a rubber composition for tire carcass topping and a tire produced using the same, wherein the rubber composition for tire carcass topping comprises 100 parts by weight of raw rubber, 5 to 30 parts by weight of reinforcing resin, 1 to 10 parts by weight of methylene donor And 1 to 6 parts by weight of nano-zinc oxide having a BET specific surface area of 60 to 90 m ² / g and an average particle diameter of 10 to 20 nm.
The rubber composition for tire carcass topping can improve modulus and adhesion performance while reducing the amount of vulcanizing agent, carbon black and zinc oxide by using a phenolic reinforcing resin, a methylene donor and nano-sized zinc oxide.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a rubber composition for tire carcass topping,

The present invention relates to a rubber composition for tire carcass topping and a tire made using the same. More particularly, the present invention relates to a rubber composition for tire carcass topping, which uses a reinforcing resin and a methylene donor to improve hardness and modulus while maintaining the breaking elongation performance, A rubber composition for tire carcass topping which is advantageous in adhesion performance while reducing the amount of zinc used compared with ordinary zinc oxide, and a tire produced using the same.

The rubber composition for tire carcass topping functions as a skeleton of a tire together with a cord to support internal pressure. Particularly in the case of radial tires for truck buses, the carcass is used by topping the rubber composition with the steel cord since it must support a large load.

The running durability performance of truck bus radial tires is influenced by the rubber composition, especially in the case of rubber for carcass topping adjacent to steel cords, requires high modulus and good endothelial performance. In addition, the adhesive force performance at the adhesive interface between the steel cord and the rubber is a main factor determining tire durability. The rubber for topping carcass should be good adhesion to steel cords and should not aging for long-term driving.

Accordingly, various techniques have been attempted to produce rubber compositions for carcass topping with high modulus. The most common technique is to use a large amount of carbon black or increase the amount of vulcanizing agent. However, the rubber composition using a large amount of carbon black has a disadvantage in that the productivity and energy efficiency are low because the rubber composition has an excessive load during the mixing process of the Banbury mix and adversely affects the roll processability, and thus the number of mixing times and time extension are inevitable.

Cobalt naphthenate, Cobalt neodecanoate, Cobalt acetoacetylate, Cobalt boron neodecanoate, etc. have been used to improve the adhesive strength. Depending on the type of acid contained in the cobalt salt, the steel cord may be corroded and the adhesion may be deteriorated.

There is also a method of improving the physical properties of the rubber composition for forming the interface between the steel cord and the rubber. One of the ways to improve the physical properties of the rubber composition is zinc oxide. Generally, in the rubber compounding, zinc oxide is dissolved in fatty acids such as stearic acid to form an effective complex with the accelerator, It is known to facilitate cross-linking of the rubber by making sulfurs.

Since zinc oxide having a specific surface area of 4 to 6 m ² / g has a disadvantage in that the crosslinking speed is slow due to a low specific surface area of 4 to 6 m ² / g, zincation is static, and the dispersibility in the rubber composition And the uniform vulcanization accelerating effect is lowered in the rubber composition, so that the physical properties of the rubber composition may become uneven or may exist locally in an excessive amount, causing problems of causing scorch of the rubber.

In addition, Zn used as a metal ion has recently been regulated as a heavy metal that is potentially toxic to an ecosystem in terms of environment, thereby lowering the content of Zn in a rubber composition.

Korean Patent Publication No. 2012-0059117 (Publication date: June 8, 2012)

It is an object of the present invention to solve the above-mentioned problems, and it is an object of the present invention to reduce the amount of carbon black added using a reinforcing resin and a methylene donor, and to provide a rubber composition for carcass topping To improve the adhesion performance between a high modulus rubber and a steel cord and to improve the endurance performance of the tire, thereby improving the tire endurance performance.

Another object of the present invention is to provide a tire produced using the rubber composition for tire carcass topping.

According to an embodiment of the present invention, there is provided a rubber composition comprising 100 parts by weight of a raw rubber, 5 to 30 parts by weight of a reinforcing resin, 1 to 10 parts by weight of a methylene donor, and a BET specific surface area of 60 to 90 m ² / g, And 1 to 6 parts by weight of nano-sized zinc oxide having a thickness of 20 nm.

The rubber composition for tire carcass topping may further comprise 2 to 10 parts by weight of a vulcanizing agent.

The weight ratio of the nano-zinc oxide and the vulcanizing agent may be 1: 1 to 1: 2.

The reinforcing resin may be a cast-modified phenolic resin from which the m-cresol moiety having an m-cresol content of 1 wt% or less is removed.

The methylene donor may be any one selected from the group consisting of hexamethylenetetramine, hexamethoxymethylmelamine, pentamethoxymethylmelamine, and combinations thereof.

Wherein the rubber composition for tire carcass topping has a nitrogen surface area per gram (N ₂ SA) of 30 to 300 m ² / g and an oil absorption amount of DBP (n-dibutyl phthalate) of 60 to 180 cc / 30 to 80 parts by weight.

The rubber composition for tire carcass topping may further comprise 0.1 to 10 parts by weight of a cobalt salt.

The cobalt salt may be selected from the group consisting of Cobalt naphthenate, Cobalt neodecanoate, Cobalt acetyl acetonate, Cobalt boron neodecanoate, and combinations thereof. Lt; / RTI > group.

The cobalt salt may include cobalt in an amount of 0.05 to 5.5% by weight based on the entire cobalt salt.

According to another embodiment of the present invention, there is provided a tire produced using the rubber composition for tire carcass topping.

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

The rubber composition for tire carcass topping according to one embodiment of the present invention comprises 100 parts by weight of a raw rubber, 5 to 30 parts by weight of a reinforcing resin, 1 to 10 parts by weight of a methylene donor, and a BET specific surface area of 60 to 90 m ² / g And 1 to 6 parts by weight of nano-zinc oxide having an average particle diameter of 10 to 20 nm.

The raw material rubber may be natural rubber or synthetic rubber.

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

The above-mentioned general natural rubber may be used as long as it is known as natural rubber, and the country of origin and the like are not limited. The natural rubber includes cis-1,4-polyisoprene as a main component, but may also include trans-1,4-polyisoprene depending on required characteristics. Therefore, in addition to natural rubber containing cis-1,4-polyisoprene as a main component, natural rubber including trans-1,4-isoprene as a main component, such as balata, Rubber may also be included.

The modified natural rubber means that the general natural rubber is modified or purified. Examples of the modified natural rubber include epoxidized natural rubber (ENR), deproteinized natural rubber (DPNR), hydrogenated natural rubber and the like.

As the reinforcing resin, a cashew modified phenolic resin which is an environment-friendly reinforcing resin can be preferably used. In particular, a cast-modified phenolic resin in which the m-cresol moiety having a content of m-cresol component of 1% by weight or less, preferably 0.1% by weight or less is removed by the reinforcing resin can be preferably used.

The above-mentioned cashew modified phenolic resin can be prepared by various methods, for example, by using an acid catalyst and reacting the phenol with an aldehyde such as formaldehyde, paraformaldehyde or benzaldehyde, followed by reforming it with cashew oil . As the acid catalyst, oxalic acid, hydrochloric acid, sulfuric acid, and p-toluenesulfonic acid may be used.

The methylene donor allows the hardness to be improved by the curing of the reinforcing resin. As the methylene donor, any one selected from the group consisting of hexamethylenetetramine, hexamethoxymethylmelamine, pentamethoxymethylmelamine, and combinations thereof can be used, and hexamethylenetetramine can be preferably used.

The rubber composition containing the reinforcing resin hardly influences mixing or processing at the time of processing. However, when the m-cresol component is removed, the methoxy group of the methylene donor at the time of vulcanization has a hydroxyl group (- OH) to form a methylene bridge between the melamine structure and the reinforcing resin to create a thermosetting resin network.

The reinforcing resin may be included in an amount of 5 to 30 parts by weight, and the methylene donor may be included in an amount of 1 to 10 parts by weight.

When the reinforcing resin is contained in an amount of less than 5 parts by weight based on 100 parts by weight of the raw material rubber, the reinforcing effect by the reinforcing resin may be insignificant. When the reinforcing resin is contained in excess of 30 parts by weight, There is a possibility that the elongation rate until the breakage is rapidly lowered.

If the methylene donor is contained in an amount of less than 1 part by weight based on 100 parts by weight of the raw material rubber, the effect of containing the methylene donor may be insufficient. If the methylene donor is contained in an amount exceeding 10 parts by weight, processability may be deteriorated.

The rubber composition for tire carcass topping contains nano-sized zinc oxide having a very small particle size and a large surface area as compared with zinc oxide which is a conventional activator in order to improve the modulus and adhesion performance. The rubber composition for tire carcass topping can improve the modulus and adhesion performance by including the nano-sized zinc oxide.

Specifically, the nano-zinc oxide may have a BET specific surface area of 60 to 90 m ² / g and an average particle diameter of 10 to 20 nm. When the nano-sized zinc oxide having a very large surface area and a particle size of several tens of nanometers as described above is used, it can exhibit excellent adhesion with the high modulus with the same amount as the conventional one, and when the same physical properties are maintained, .

The nano-sized zinc oxide may be added in an amount of 1 to 10 parts by weight, preferably 2 to 5 parts by weight, based on 100 parts by weight of the raw material rubber. If the content of the nano-sized zinc oxide is less than 1 part by weight, the vulcanization rate may be slow and the productivity may be deteriorated. If the content is more than 10 parts by weight, the physical properties of the rubber may be reduced.

The rubber composition for tire carcass topping may further comprise carbon black as a reinforcing filler.

The carbon black may have a nitrogen surface area per gram (N ₂ SA) of 30 to 300 m ² / g and an oil absorption amount of DBP (n-dibutyl phthalate) of 60 to 180 cc / 100 g. When a carbon black having the same characteristics is used, it is possible to produce a rubber composition for a tire carcass having proper reinforcement and appropriate processability.

If the nitrogen adsorption specific surface area of the carbon black exceeds 300 m ² / g, the workability of the rubber composition for a tire may be deteriorated. If it is less than 30 m ² / g, the reinforcing performance by carbon black as a filler may be deteriorated. If the DBP oil absorption of the carbon black exceeds 180 cc / 100 g, the workability of the rubber composition may be deteriorated. If it is less than 60 cc / 100 g, the reinforcing performance by carbon black as a filler may be deteriorated.

Typical examples of the carbon black include N110, N121, N134, N220, N231, N234, N242, N293, N299, N315, N326, N330, N332, N339, N343, N347, N351, N358, N375, N539, , N630, N642, N650, N683, N754, N762, N765, N774, N787, N907, N908, N990 or N991.

The carbon black may be contained in an amount of 30 to 80 parts by weight based on 100 parts by weight of the raw rubber, more preferably 45 to 65 parts by weight, and still more preferably 53 to 57 parts by weight. When the content of the carbon black is less than 30 parts by weight, the reinforcing performance by the carbon black as the filler may be deteriorated. If the content is more than 80 parts by weight, the workability of the rubber composition may be deteriorated.

The rubber composition for tire carcass topping further includes a cobalt salt, whereby the adhesion can be further improved. In the case of using the cobalt salt, corrosion of the tire steel cord may occur depending on the type of the acid contained. In this case, the BET specific surface area is 60 to 90 m ² / g and the average particle diameter is 10 To 20 nm, it is possible to prevent the corrosion of the tire steel cord.

Examples of the cobalt salt include Cobalt naphthenate, Cobalt neodecanoate, Cobalt acetyl acetonate, Cobalt boron neodecanoate, and combinations thereof. The cobalt acetylacetonate has a high molecular weight effect and a high stability of the cobalt ion due to the low breakage of the rubber chain during processing relative to the cobalt boron decanoate complexes, Which is advantageous also in terms of suppressing chain breakage by the chain. Through this process, the modulus and the endothelium properties of the rubber composition for vulcanizing the carcass topping can be improved more effectively than the cobalt boron composite.

The cobalt salt may be included in an amount of 0.1 to 10 parts by weight based on 100 parts by weight of the raw rubber. If the content of the cobalt salt exceeds 10 parts by weight, problems such as a high Mooney viscosity and a low fatigue resistance may be caused from the viewpoint of the vulcanization processability. If the content is less than 0.1 part by weight, the pulling force with the steel cord may decrease.

The cobalt salt may contain cobalt in an amount of 0.05 to 5.5% by weight based on the entire cobalt salt. If the content of cobalt is less than 0.05% by weight, there may be a problem of pulling power with steel cords. When the content of cobalt is more than 5.5% by weight, the Mooney viscosity increases and the fatigue resistance is lowered.

The rubber composition for tire carcass topping uses a large amount of reinforcing resin to improve the aging adhesion performance with the steel cord by using a phenolic resin and a methylene donor excellent in hygroscopicity and to increase the modulus and reduce the amount of carbon black and sulfur And to improve durability through improvement of fatigue performance by solving the problem that tensile strength, elongation at break and aging characteristics at high temperature are inferior.

Meanwhile, the rubber composition for tire carcass topping may further comprise a vulcanizing agent. As the vulcanizing agent, a sulfur vulcanizing agent can be preferably used. The sulfur vulcanizing agent may be an inorganic vulcanizing agent such as powdered sulfur (S), insoluble sulfur (S), precipitated sulfur (S), or colloid sulfur. As the sulfur vulcanizing agent, a vulcanizing agent which produces elemental sulfur or sulfur, for example, amine disulfide, polymer sulfur and the like can be used.

The weight ratio of the nano zinc oxide and the vulcanizing agent is 1: 1 to 1: 2, preferably 1: 1.167 to 1: 1.4. have. When the weight ratio of the nano-zinc oxide and the vulcanizing agent is within the above range in the vulcanizing agent content range, the rubber composition of the present invention can be most efficiently crosslinked.

The rubber composition for tire carcass topping may further include various additives such as an additional vulcanization accelerator, an anti-aging agent or a softening agent. Any of the various additives may be used as long as they are commonly used in the field to which the present invention belongs, and the content thereof is not particularly limited as long as it depends on the compounding ratio used in a conventional rubber composition for topcoat topping.

The vulcanization accelerator refers to an accelerator that promotes the vulcanization rate or accelerates the retardation in the initial vulcanization step.

Examples of the vulcanization accelerator include sulfenamide, thiazole, thiuram, thiourea, guanidine, dithiocarbamate, aldehyde-amine, aldehyde-ammonia, imidazoline, Or a combination thereof.

The vulcanization accelerator may be included in an amount of 0.5 to 4.0 parts by weight based on 100 parts by weight of the raw material rubber in order to maximize productivity improvement and rubber property enhancement through vulcanization speed promotion.

The vulcanization accelerating assistant may be used in combination with the vulcanization accelerator to complete the promoting effect. The organic vulcanization accelerator auxiliary may be further used together with the nano-zinc oxide. When the nano-zinc oxide and the organic-based vulcanization accelerating assistant are used together, the nano-zinc oxide is dissolved in the stearic acid to form an effective complex with the vulcanization accelerator to produce favorable sulfur during the vulcanization reaction, .

As the organic vulcanization accelerating auxiliary, there may be selected from the group consisting of stearic acid, zinc stearate, palmitic acid, linoleic acid, oleic acid, lauric acid, dibutyl ammonium oleate, derivatives thereof, Can be used.

When the nano-sized zinc oxide and the stearic acid are used together, they may be used in an amount of 0.3 to 5 parts by weight based on 100 parts by weight of the raw material rubber, respectively, in order to serve as an appropriate vulcanization accelerating auxiliary. If the content of stearic acid is less than the above range, the vulcanization rate may be slow and the productivity may be deteriorated. If the content exceeds the above range, scorch phenomenon may occur and the physical properties may be deteriorated.

The softening agent is added to the rubber composition in order to impart plasticity to the rubber to facilitate processing or to decrease the hardness of the vulcanized rubber, and means an oil or other material used in rubber compounding or rubber production. The softening agent means an oil contained in a process oil or other rubber composition. The softener may be selected from the group consisting of petroleum oils, vegetable oils, and combinations thereof, but the present invention is not limited thereto.

Recently, when the content of Polycyclic Aromatic Hydrocarbons (hereinafter referred to as PAHs) contained in the aromatic oil is higher than 3 wt% together with a rise in environmental consciousness, aromatic extract oils, mild extraction solvate oils, residual aromatic extract oils or heavy naphthenic oils can be preferably used.

Particularly, the oil used as the softening agent preferably has a total content of PAHs components of not more than 3 wt%, a kinematic viscosity of not less than 95 (210 S SUS), an aromatic component of 15 to 25 wt%, a naphthene component Of 27 to 37% by weight and a paraffinic component of 38 to 58% by weight can be preferably used.

The TDAE oil is advantageous for environmental factors such as the possibility of cancer induction of PAHs while improving the fuel efficiency of the tire carcass including the TDAE oil.

It is preferable that the softening agent is used in an amount of 0 to 15 parts by weight based on 100 parts by weight of the raw material rubber, because it improves the workability of the raw material rubber.

The antioxidant is an additive used to stop the chain reaction in which the tire is autoxidized by oxygen. As the anti-aging agent, any one selected from the group consisting of an amine type, a phenol type, a quinoline type, an imidazole type, a carbamic acid metal salt, a wax and a combination thereof can be appropriately selected and used.

Considering the conditions that the solubility of the antioxidant in addition to the anti-aging action is high, the solubility in the rubber is small, the volatility is small, the solubility should be inactive to the rubber, and the vulcanization should not be inhibited, By weight.

The rubber composition for tire carcass topping is not limited to carcass, but may be included in various rubber components constituting the tire. Examples of the rubber component include a rubber composition for belt topping, a tread (tread cap and tread base), a sidewall, a sidewall insert, an apex, a chafer, an inner liner or a wire coat.

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

The tires may be automobile tires, racing tires, airplane tires, agricultural tires, off-the-road tires, truck tires or bus tires. Further, the tire may be a radial tire or a bias tire, and preferably a radial tire.

The rubber composition for tire carcass topping of the present invention can improve the modulus and adhesion performance while reducing the amount of vulcanizing agent, carbon black and zinc oxide by using a phenolic reinforcing resin, a methylene donor and nano-sized zinc oxide.

Hereinafter, embodiments of the present invention will be described in detail so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

[ Manufacturing example : Preparation of rubber composition]

Rubber compositions for tire carcass topping according to the following Examples and Comparative Examples were prepared using the compositions shown in Table 1 below. The production of the rubber composition was in accordance with the usual production method of the rubber composition.

( Comparative Example  One)

As shown in Table 1, 70 parts by weight of carbon black (N330), 0.5 part by weight of cobalt salt, 5 parts by weight of zinc oxide and 7 parts by weight of sulfur were mixed in 100 parts by weight of natural rubber, and mixed in a Banbury mixer. To produce rubber specimens.

The zinc oxide is commonly used industrial zinc oxide.

( Example  One)

Rubber specimens were prepared using the same composition and method as in Comparative Example 1, except that 10 parts by weight of reinforcing resin and 5 parts by weight of methylene donor were added

As the reinforcing resin, cast-modified phenolic resin with m-cresol removed was used, and hexamethylenetetramine (HMTA) was used as the methylene donor.

( Example  2)

A rubber specimen was prepared using the same composition and method as in Example 1 except that the content of carbon black was 50 parts by weight and the content of sulfur was 3.5 parts by weight.

( Example  3)

A rubber specimen was prepared in the same manner as in Example 1, except that 3 parts by weight of zinc oxide was added instead of 5 parts by weight of zinc oxide.

The nano-zinc oxide used had a BET specific surface area of 65 m ² / g and an average particle diameter of 15 nm.

( Example  4)

A rubber specimen was prepared using the same composition and method as in Example 1, except that 5 parts by weight of nano-zinc oxide was used in Example 3.

( Example  5)

A rubber specimen was prepared using the same composition and method as in Example 3 except that the content of carbon black was adjusted to 50 parts by weight and the content of sulfur was adjusted to 3.0 parts by weight.

Compounding agent Comparative Example 1 Example 1 Example 2 Example 3 Example 4 Example 5 NR 100 100 100 100 100 100 Carbon black
(N330) 70 70 50 70 70 50 Reinforced Resin - 10 10 10 10 10 Methylene donor - 5 5 5 5 5 Cobalt salt 0.5 0.5 0.5 0.5 0.5 0.5 sulfur 7 7 3.5 7 7 3.5 General zinc oxide 5.0 5.0 5.0 - - - Nano zinc oxide - - - 3.0 5.0 3.0

(Unit: parts by weight)

[ Experimental Example : Measurement of physical properties of the prepared rubber composition]

The physical properties of the rubber specimens prepared in Examples and Comparative Examples were measured and the results are shown in Table 2 below.

The above physical properties were measured by Shore A, 300% modulus (kg / cm ² ), tensile strength (kg / cm ² ), elongation at break (%), water absorption rate (%) and initial adhesion force (Kgf) Were measured.

In this case, the steel cord (3 + 9 (0.22) + w) was placed at the center of the unvulcanized rubber specimen and the adhesion was measured using the vulcanized specimen for the adhesion test. The aging test was conducted for 2 weeks After aging, the adhesive strength of six specimens was measured and the average value was shown.

The characteristics of endothelium were 50% after 50 days of aging at 100 ℃ for 1 week, and then the fracture cycles of 6 samples were measured at 118% strain using a fatigue tester.

Item Comparative Example 1 Example 1 Example 2 Example 3 Example 4 Example 5 Hardness 60 72 62 62 62 64 300% modulus (kg / cm ² ) 142 192 152 145 153 153 Tensile strength (kg / cm ² ) 248 212 254 246 265 252 Elongation at break (%) 340 245 342 345 310 343 Water Absorption Rate (%) 0.45 0.17 0.16 0.40 0.42 0.19 Initial adhesion force (Kgf) 120 162 141 118 132 148 Heat aging (Kgf) 105 143 118 106 114 127 Hydrothermal aging (Kgf) 85 131 110 88 103 121 Brine Aging (Kgf) 82 110 102 84 93 108 Moisture aging (Kgf) 91 122 116 95 106 125 50% fatigue life
(kcycles) 350 243 380 368 335 412

division Exam conditions Heat aging 100 ℃ Hydrothermal aging 100 ° C water Salt water aging 20% Nacl solution, room temperature Moisture aging 100 캜, relative humidity 96

From the physical properties of Table 2, it can be seen that when the content of sulfur and carbon black is reduced and a large amount of reinforcing resin or methylene donor is added, the hardness and modulus increase and the tensile strength and elongation at break are also maintained. Performance and endothelium are improved.

Further, Example 3 in which 0.3 parts by weight of nano-zinc oxide was added exhibited the same level of physical properties as Comparative Example 1 in which general zinc oxide was used. In Example 4 using 5 parts by weight of nano-zinc oxide, Physical properties and adhesion performance.

In the case of Example 5 in which the reinforcing resin and the nano-sized zinc oxide were added, not only the amount of sulfur, carbon black and zinc oxide used in Comparative Example 1 could be reduced, but the same level of compounding property, adhesion performance and endothelial performance could be improved Zn content can be reduced, which is useful for environmentally friendly tires.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, Of the right.

Claims (10)

100 parts by weight of the raw rubber,
5 to 30 parts by weight of a reinforcing resin which is a cast-modified phenolic resin from which an m-cresol component having an m-cresol content of 1% by weight or less is removed,
1 to 10 parts by weight of hexamethylenetetramine methylene donor,
1 to 6 parts by weight of nano-zinc oxide having a BET specific surface area of 60 to 90 m ² / g and an average particle diameter of 10 to 20 nm, and
0.1 to 10 parts by weight of a cobalt salt
And a rubber composition for tire carcass topping. The method according to claim 1,
Wherein the rubber composition for tire carcass topping further comprises 2 to 10 parts by weight of vulcanization. 3. The method of claim 2,
Wherein the weight ratio of the zinc nano-oxide to the vulcanizing agent is 1: 1 to 1: 2. delete delete The method according to claim 1,
Wherein the rubber composition for tire carcass topping has a nitrogen surface area per gram (N ₂ SA) of 30 to 300 m ² / g and an oil absorption amount of DBP (n-dibutyl phthalate) of 60 to 180 cc / And 30 to 80 parts by weight of the rubber composition for topcoat topping. delete The method according to claim 1,
The cobalt salt may be selected from the group consisting of Cobalt naphthenate, Cobalt neodecanoate, Cobalt acetyl acetonate, Cobalt boron neodecanoate, and combinations thereof. Lt; RTI ID = 0.0 > carcassing < / RTI > The method according to claim 1,
Wherein the cobalt salt contains 0.05 to 5.5% by weight of cobalt relative to the total cobalt salt. A tire produced by using the rubber composition for tire carcass topping according to claim 1.