The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 03, 2019
Filed:
Apr. 04, 2018
Sumitomo Rubber Industries, Ltd., Kobe-shi, Hyogo, JP;
Kensuke Washizu, Kobe, JP;
SUMITOMO RUBBER INDUSTRIES, LTD., Kobe-Shi, Hyogo, JP;
Abstract
The present invention provides a rubber composition excellent in grip performance, durability of grip performance, and abrasion resistance. Also provided is a pneumatic tire formed from the rubber composition. The present invention relates to a rubber composition exhibiting a temperature dependence curve of tan δ with a half-width defined by Equation (1) of 45 or less as measured at a strain of 0.1% and a frequency of 10 Hz, the rubber composition having a temperature dependence of hardness defined by Equation (2) of 4.3 or less, the temperature dependence curve having a peak temperature of 10° C. or lower,half-width=(temperature at half-peak height on high temperature side)−(temperature at half-peak height on low temperature side),  Equation (1):temperature dependence of hardness=(hardness index at 0° C.)/(hardness index at 100° C.).  Equation (2):