Rubber composition and pneumatic tire using the same

摘要

An object of the present invention is to provide a rubber composition capable of achieving both good rolling resistance properties and good wear resistance in a compatible manner when the rubber composition is applied to a component member, e.g. tread, of a tire. Specifically, the present invention provides a rubber composition comprising a rubber composition and hydrated silica, wherein “CTAB” (m2/g) as specific surface area by cetyltrimethylammonium bromide adsorption and “IB” as ink bottle-shaped micropore index, of the hydrated silica, satisfy a specific relationship and “weight loss on ignition” (mass %) as weight loss when the hydrate silicate is heated at 750 ° C. for 3 hours and “weight loss on heating” (mass %) as weight loss when the hydrate silicate is heated at 105 ° C. for 2 hours satisfy a specific relationship.

主权项

1. A rubber composition, comprising:
a rubber component; and a hydrated silica having particles each provided with micropores with openings in the range of 1.2×105 nm to 6 nm formed at outer surface of the particle, wherein in measurement according to a mercury press-in method using a mercury porosimeter of the hydrated silica, provided that: M1 (nm) represents diameter of the opening exhibiting the maximum value of mercury charge rate when pressure is increased from 1 PSI to 32000 PSI; M2 (nm) represents diameter of the opening exhibiting the maximum value of mercury discharge rate when pressure is decreased from 32000 PSI to 1 PSI; IB represents ink bottle-shaped micropore index;
IB=M2−M1  (X); and CTAB (m2/g) represents specific surface area by cetyltrimethylammonium bromide adsorption, IB and CTAB satisfy following formula (I),
IB ≦−0.36×CTAB +86.8  (I).