JP2008201824A - Rubber composition and pneumatic tire using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rubber composition affording high steering performances without deteriorating operability and abrasion resistance at low temperatures and to provide a tire using the rubber composition. <P>SOLUTION: The rubber composition is obtained by compounding a rubber component with a rosin-modified phenol resin. The tire is prepared by using the rubber composition. The rosin-modified phenol resin is preferably compounded in an amount of 1-40 pts.mass based on 100 pts.mass of the rubber component. In the rubber composition, the softening point of the rosin-modified phenol resin is more preferably 120-200°C. The tire is prepared by using the rubber composition. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rubber composition and a tire using the rubber composition. More specifically, the present invention relates to a rubber composition for a tire tread that can provide a tire with improved operational performance, and a pneumatic tire using the same.

  In recent years, automobiles have become more sophisticated, and high speed has been emphasized in combination with the development of a highway network. Accordingly, not only motor sports tires but also general passenger car tires are required to have excellent high-speed maneuverability.

  As one of the solutions, a tire having a radial structure, and among these, a flat radial tire is used.

  However, the size is different between a normal tire and a flat radial tire. Therefore, changing the size of the tire is limited by the size of the tire house of the vehicle to be mounted, and is restricted from the design side of the vehicle.

  In addition, when the owner of a vehicle equipped with a normal tire changes from a normal tire to a flat radial tire and intends to improve high-speed maneuverability, it is often accompanied by an increase in the diameter of the wheel, so a new wheel needs to be purchased. Therefore, a technique for improving high-speed maneuverability with the same tire size is desired.

  In order to solve this problem, a combination of a specific polymer, carbon black, and a softening agent has been studied as a rubber composition for a tire tread, but it has been sufficiently satisfied in terms of improving the high-speed maneuverability of the tire. Not in.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a rubber composition and a tire using the same, which can obtain high maneuverability without deteriorating operability and wear resistance at low temperatures.

  As a result of intensive studies to achieve the above object, the present inventors have found that the above object can be achieved by blending a rosin-modified phenolic resin into a rubber composition, and the present invention has been completed.

  That is, the rubber composition of the present invention is characterized in that a rosin-modified phenol resin is blended with a rubber component.

  In the rubber composition of the present invention, 1 to 40 parts by mass of rosin-modified phenolic resin is preferably blended with 100 parts by mass of the rubber component, and the softening point of the rosin-modified phenolic resin is 120 to 200 ° C. Is preferred. The rubber component may be one or more selected from the group consisting of natural rubber, styrene / butadiene copolymer rubber, polybutadiene rubber, polyisoprene rubber, halogenated butyl rubber, EPDM rubber, and acrylonitrile rubber. Preferably, 50% by mass or more of the rubber component is styrene / butadiene copolymer rubber.

  The pneumatic tire of the present invention is characterized by using the rubber composition as a tread member.

  According to the present invention, it is possible to provide a rubber composition and a pneumatic tire using the rubber composition capable of significantly improving high maneuverability without deteriorating operability and wear resistance at low temperatures. it can.

Embodiments of the present invention will be specifically described below.
The rubber composition according to the present invention has a high operability significantly improved without deteriorating operability and wear resistance at low temperatures by blending a rosin-modified phenol resin with a rubber component. It is a thing.

  In the rubber composition of the present invention, it is preferable that 1 to 40 parts by mass of rosin-modified phenol resin is blended with 100 parts by mass of the rubber component. If the content of the rosin-modified phenolic resin is less than 1 part by mass, sufficient performance may not be exhibited, and if it exceeds 40 parts by mass, workability may be extremely deteriorated and sufficient performance may not be exhibited.

  In the rubber composition of the present invention, the softening point of the rosin-modified phenolic resin is preferably 120 ° C to 200 ° C. When the softening point of the rosin-modified phenol resin is less than 120 ° C or higher than 200 ° C, sufficient performance may not be exhibited.

  In the rosin-modified phenolic resin of the present invention, gum rosin, wood rosin, tall oil rosin and the like can be typically used as the rosin used for modification. Moreover, as a phenol resin before modification | denaturation, a novolak type, a resol type, and a novolak-resole composite type phenol resin can be used.

  In the rubber composition of the present invention, the rubber component is one or more selected from natural rubber, styrene / butadiene copolymer rubber, polybutadiene rubber, polyisoprene rubber, halogenated butyl rubber, EPDM rubber, and acrylonitrile rubber. It is preferable that Natural rubber and synthetic rubber may be used alone or in combination of two or more.

  In the rubber composition of the present invention, 50% by mass or more of the rubber component is preferably styrene / butadiene copolymer rubber. If the styrene / butadiene copolymer rubber in the rubber component is less than 50% by mass, the desired effect may not be obtained, which is not preferable.

  In the rubber composition of the present invention, carbon black, silica, alumina, aluminum hydroxide, calcium carbonate, titanium oxide and the like can be used alone or in combination of two or more as a filler, preferably Carbon black is used.

  In the present invention, in addition to the above-mentioned raw rubber, filler, resin, compounding agents usually used in the rubber industry, such as softeners, anti-aging agents, coupling agents, vulcanization accelerators, Vulcanization accelerating aids, vulcanizing agents and the like can be blended within the range of ordinary blending amounts as necessary.

  Moreover, the rubber composition of this invention can be used as a tread member for a pneumatic tire. Thereby, high maneuverability can be obtained without deteriorating operability and wear resistance at low temperatures.

EXAMPLES Next, although an Example demonstrates this invention in more detail, this invention is not limited by this example.
The compounding components shown in Tables 1 and 2 below were kneaded and compounded using a 500 mL lab plast mill and a 3 inch roll to obtain an unvulcanized rubber composition. The obtained unvulcanized rubber composition was vulcanized at 160 ° C. for 15 minutes. A tensile test and a dynamic viscoelasticity test of these vulcanized rubbers were performed according to the following procedures. The obtained evaluation results are shown in Tables 1 and 2 below.

(Tensile test)
A tensile test was performed based on JISK6301-1995 (use of No. 3 test piece), and elongation at break (EB), breaking strength (TB), and elastic modulus at 300% elongation (M ₃₀₀ ) were measured. Each data is shown as an index with Comparative Example 1 as 100.

(Dynamic viscoelasticity test)
Using a spectrometer (manufactured by Toyo Seiki Co., Ltd., dynamic viscoelasticity measuring tester), E '(dynamic storage elastic modulus) and tanδ (loss factor) are measured at a frequency of 52 Hz, a measurement temperature of 30 ° C, and a strain of 1%. did. Each data is shown as an index with Comparative Example 1 as 100.

  Furthermore, using the rubber compositions of Examples 1 to 10 and Comparative Example 1 as tread rubber, trial production of pneumatic tires of 185 / 70R14 size treads (single layer structure) was performed, and the performance of each tire was controlled by actual vehicle running. Sexuality was evaluated. The obtained evaluation results are shown in Tables 1 and 2 below.

(Maneuverability)
In the dry asphalt road test course, the actual FF4 door sedan fitted with each new tire was used to drive, control, handle response, and control during operation. The test driver gave a comprehensive evaluation.
+1: If the protest driver feels better than the control tire, +2: If the protest driver clearly feels better than the control tire, +3: Skilled among general drivers compared to the control tire When the driver feels good enough to understand the driver +4: When the driver feels better than the control tire

＊１ ＳＢＲ１５００（ＪＳＲ製）
＊２ ＩＳＡＦ（シースト３Ｈ、東海カーボン株式会社製）
＊３ シリカ（ニップシールＡＱ、東ソーシリカ工業株式会社製）
＊４ シランカップリング剤Ｓｉ６９（デグサＡＧ製）
＊５ ロジン変性フェノールＰＲ１２６０３（住友ベークライト株式会社製、軟化点１３５℃）
＊６ タマノル１４５（荒川化学工業株式会社製、軟化点１４３℃）
＊７ タマノル３４０（荒川化学工業株式会社製、軟化点１７０℃）
＊８ ノクラック６Ｃ（大内新興化学工業株式会社製）
＊９ ノクセラーＤ（大内新興化学工業株式会社製）
＊１０ ノクセラーＮＳ（大内新興化学工業株式会社製）

* 1 SBR1500 (manufactured by JSR)
* 2 ISAF (Seast 3H, manufactured by Tokai Carbon Co., Ltd.)
* 3 Silica (Nip seal AQ, manufactured by Tosoh Silica Industry Co., Ltd.)
* 4 Si69 coupling agent Si69 (manufactured by Degussa AG)
* 5 Rosin-modified phenol PR12603 (manufactured by Sumitomo Bakelite Co., Ltd., softening point 135 ° C)
* 6 Tamanoru 145 (Arakawa Chemical Industries, softening point 143 ° C)
* 7 Tamanoru 340 (Arakawa Chemical Industries, softening point 170 ° C)
* 8 Nocrack 6C (Ouchi Shinsei Chemical Co., Ltd.)
* 9 Noxeller D (made by Ouchi Shinsei Chemical Co., Ltd.)
* 10 Noxeller NS (made by Ouchi Shinsei Chemical Co., Ltd.)

Claims (6)

  A rubber composition comprising a rosin-modified phenolic resin and a rubber component.   The rubber composition according to claim 1, wherein 1 to 40 parts by mass of the rosin-modified phenolic resin is blended with 100 parts by mass of the rubber component.   The rubber composition according to claim 1 or 2, wherein a softening point of the rosin-modified phenolic resin is 120 ° C to 200 ° C.   2. The rubber component is one or more selected from the group consisting of natural rubber, styrene / butadiene copolymer rubber, polybutadiene rubber, polyisoprene rubber, halogenated butyl rubber, EPDM rubber and acrylonitrile rubber. The rubber composition according to any one of?   The rubber composition according to claim 4, wherein 50% by mass or more of the rubber component is styrene / butadiene copolymer rubber.   A pneumatic tire using the rubber composition according to any one of claims 1 to 5 as a tread member.