FIELD: chemistry.
SUBSTANCE: described the rubber mixture as one of the versions, containing the rubber component and the filler, for which the peak temperature on the temperature curve tanδ is -16.0°C or higher and -6.0°C or lower, the value of tanδ in the peak position is more than 1.13, tanδ at 0°C is 0.95 or more and the value, obtained by dividing the absolute value of the difference between the values of tan δat -5°C and tanδ at 5°C by the temperature difference between -5 and 5°C {|(tanδ at -5°C)-(tanδ at 5°C)|/10} (/°C) is less than 0.045/°C. The invention also relates to the rubber mixture embodiment, containing the rubber component and the filler, including at least two types of styrene-butadiene copolymer rubber, differing in bound styrene content, and the filler. The indicated mixture is the rubber compound for tire treads in which the difference between the bound styrene St (A) content in the styrene-butadiene copolymer rubber (A), having the high bound styrene content and the bound styrene content St (B) in the styrene-butadiene copolymer rubber (B), having the low bound styrene content, {St(A)-St(B)} is 6-22 wt % and tanδ of which at 0°C is 0.95 or more, and the value obtained by dividing the absolute value of the difference between the tan valuesδ at -5°C and tanδ at 5°C by the temperature difference between -5 and 5C° {|(tanδ at -5°C)-(tanδ at 5°C)|/10} (/°C) is less than 0.045/°C.
EFFECT: invention provides the rubber mixtures production for tire treads, corresponding to higher requirements for low heat generation and wet braking efficiency.
11 cl, 1 tbl, 1 dwg, 6 ex
