SIDEWALL INSERT RUBBER COMPOSITION FOR A RUN-FLAT TIRE CAPABLE OF SECURING THE DRIVING SAFETY WITH A CONSTANT SPEED WHILE SUPPORTING THE LOADS OF A VEHICLE, AND A TIRE MANUFACTURED BY USING THE SAME

摘要

PURPOSE: A sidewall insert rubber composition is provided to have a high hardness and a tensile strength, to improve fatigue resistance, crack resistance, and heating resistance, and to have excellent run-flat performance.;CONSTITUTION: A sidewall insert rubber composition includes 20-70 parts by weight of a natural rubber, 20-70 parts by weight of a butadiene rubber, and 10-60 parts by weight of a styrene-butadiene-isoprene rubber. The styrene content of the styrene-butadiene-isoprene rubber is 25-50 wt%, and vinyl content in the butadiene is 25-50 wt%, and the methyl content in the isoprene is 25-50 wt%. Molecular terminals of the styrene-butadiene-isoprene rubber are modified with hydrophilic groups. The molecules are coupled with each other by Sn or Si.;COPYRIGHT KIPO 2013