US Patent Issued to OTSUKA CHEMICAL on April 15 for "Sulfanyl sulfonic acid compound, viscoelastic modifier, rubber composition, and vulcanized rubber production method" (Japanese Inventors)

ALEXANDRIA, Va., June 5 -- United States Patent no. 12,275,836, issued on April 15, was assigned to OTSUKA CHEMICAL Co. LTD. (Osaka, Japan).

"Sulfanyl sulfonic acid compound, viscoelastic modifier, rubber composition, and vulcanized rubber production method" was invented by Natsuyo Kamimoto (Ichihara, Japan) and Takeshi Hara (Ichihara, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "Disclosed is a sulfanyl sulfonic acid compound represented by the following formula (1) or a metal salt thereof. In the formula, m represents an integer of 2 to 7, n represents an integer of 3 to 10, and R1 and R2 each independently represent a hydrogen atom or an alkyl group."

The patent was filed on Feb. 26, 2021, under A...