Rubber composition for tyre.

摘要

A rubber composition for a tyre characteristically comprising a diene rubber having an epoxy group, either a monoamine compound or a diamine compound having a structural unit represented by the formula (1): (where R<1>, R<2>, R<3>, and R<4> are each a hydrogen atom or an alkyl group having one to three carbon atoms, and X represents any structural formula) and carbon black, wherein the rubber composition has a dissipation factor at -10 DEG C (tan delta (-10 DEG C)) and a dissipation factor at 70 DEG C (tan delta (70 DEG C)) which satisfy the following expressions: $$ $ $ where\; tan\; delta\; c(-10\; DEG\; C)\; and\; tan\; delta\; c(70\; DEG\; C)\; are\; tan\; delta\; at\; -10\; DEG\; C\; and\; 70\; DEG\; C\; of\; a\; control\; rubber\; composition\; of\; the\; same\; formulation\; as\; the\; rubber\; composition\; except\; that\; the\; control\; rubber\; composition\; includes\; a\; diene\; rubber\; having\; no\; epoxy\; group\; and\; is\; free\; of\; the\; diamine\; compound\; having\; a\; structural\; unit\; represented\; by\; the\; formula\; (1).$$$$