Rubber composite cord for a tread of a pneumatic tire

摘要

A composite cord includes a rubber core and a rubber sheath surrounding, at least in part, the rubber core. A formulation of the core is different from that of the sheath. The rubber core includes at least one diene elastomer and more than 30 phr of a filler A. The filler A includes nanoparticles having a weight-average size of less than 500 nm. The rubber sheath includes at least one diene elastomer, from 0 to less than 30 phr of a filler A′, and more than 70 phr of a filler B. The filler A′ includes nanoparticles having a weight-average size of less than 500 nm. The filler B includes microparticles having a weight-median size of greater than 1 μm.

主权项

1. A composite cord comprising:
a rubber core; and a rubber sheath surrounding, at least in part, the rubber core, wherein a formulation of the rubber core is different from a formulation of the rubber sheath, wherein the rubber core includes:
a diene elastomer, andmore than 30 phr (parts by weight per hundred parts of elastomer) of a filler A, the filler A including nanoparticles having a weight-average size of less than 500 nm, and wherein the rubber sheath includes:
a diene elastomer,from 0 to less than 30 phr of a filler A′, the filler A′ including nanoparticles having a weight-average size of less than 500 nm, andmore than 70 phr of a filler B, the filler B including microparticles having a weight-median size of greater than 1 μm.