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Problems solved by technology
However, this method is disadvantageous in that it deteriorates wear resistance or worn appearance after wear (ie, wavy grain peaks), so it is rarely applied to tires for general public roads
Method used
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preparation example Construction
[0142] In usual production methods, vulcanizing agents are introduced in the final kneading. However, in order to improve its dispersibility in the rubber component to produce more uniform crosslinking, it is preferable to introduce the zinc dithiophosphate in the basic kneading.
[0143] However, in the case where zinc dithiophosphate is used in the form of a masterbatch such as TP-50 from Rhein Chemie and mixed with a dispersing aid, even if zinc dithiophosphate is mixed in the final kneading When incorporated, substantially the same physical properties as those obtained when zinc dithiophosphate is introduced in basic kneading can also be obtained.
[0144] After the basic kneading step, for example, a final kneading step may be performed in which the obtained kneaded mixture 1 is kneaded with a vulcanizing agent (such as sulfur), a vulcanization accelerator, etc. using the kneader as described above ( at a discharge temperature of, for example, 80°C to 110°C), followed by...
Embodiment
[0150] The invention will be described in more detail with reference to non-limiting examples.
[0151] Chemicals used in Examples and Comparative Examples are listed below.
[0152]
[0153] Modified SBR1: a product prepared as follows (oil extender: 37.5 parts, styrene content: 41%, vinyl content: 40%, Tg: -29°C, weight average molecular weight: 1,190,000)
[0154] Silica-modified SBR2: a product produced as follows (styrene content: 27% by mass, vinyl content: 58% by mass, Tg: -27°C, weight average molecular weight: 720,000)
[0155]NS612: Product purchased from Japan Zeon Co., Ltd. (non-oil-extended, styrene content: 15%, vinyl content: 30%, Tg: -65°C, weight average molecular weight: 780,000)
[0156]
[0157] (1) Preparation of chain end modifiers
[0158] Under a nitrogen atmosphere, add 20.8 g of 3-(N,N-dimethylamino)propyltrimethoxysilane (purchased from AZmax Company) into a 250 mL volumetric flask, and then add anhydrous hexane (purchased from Kanto Chemical C...
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Abstract
The present invention provides: a rubber composition for treads, which contains a diene rubber as a rubber component and is capable of achieving a good balance among wet grip performance, wear resistance and blowout resistance on dry roads; and a pneumatic tire having a tread which is produced using this rubber composition for treads. The present invention is a rubber composition for treads, which contains: a diene rubber containing a styrene butadiene rubber; zinc dithiophosphate; an inorganic filler which is composed of at least one substance selected from the group consisting of compounds represented by the formula described below, magnesium sulfate and silicon carbide, and which has a BET value of 5-120 m<2> / g and a linseed oil absorption of 30-80 ml / 100 g; and sulfur. Relative to 100 parts by mass of the diene rubber, the content of the zinc dithiophosphate is 0.2-15 parts by mass, the content of the inorganic filler is 1-70 parts by mass, and the content of zinc oxide is less than 2.5 parts by mass. In the formula of mM.xSiOy.zH2O, M represents at least one metal selected from the group consisting of Al, Mg, Ti, Ca and Zr, or an oxide or hydroxide of the metal; m represents an integer of 1-5; x represents an integer of 0-10; y represents an integer of 2-5; and z represents an integer of 0-10.
Description
technical field [0001] The present invention relates to a rubber composition for treads and a pneumatic tire including a tread formed from the rubber composition for treads. Background technique [0002] Pneumatic tires are formed from many different components, including the tread and sidewalls. These components give the pneumatic tire their respective properties. Among other components, the tread that comes into contact with the road needs to have grip performance, wear resistance, stretch performance and other properties. [0003] The rubber composition used in the tread of a pneumatic tire is usually prepared by mixing fillers (such as silica or carbon black) and softeners (such as low-temperature plasticizers, process oils, liquid resins, or ℃ or less) is added to the rubber component including diene rubber. Further, sulfur and zinc oxide, and optional vulcanization accelerators (for example, thiazole-based vulcanization accelerators (such as TBBS, CBS), thiuram-base...
Claims
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