Patents for June

Patent as compiled by the editors of Rubber World for the June issue

Modified conjugated diene-based polymer and rubber composition including the same
U.S. patent: 11,299,559
Issued: April 12, 2022
Inventors: Ho Young Lee, Jae Hoon Choe, Kyung Chang Seo and No Ma Kim
Assigned: LG Chem
Key statement: A modified conjugated diene-based polymer and a rubber composition including a modified conjugated diene-based polymer are disclosed herein. In some embodiments, a modified conjugated diene-based polymer includes a functional group derived from a modification initiator at one terminal and a functional group derived from a modifier represented by the Formula 2 or Formula 3 at the other terminal, wherein the modified conjugated diene-based polymer has a unimodal molecular weight distribution, and a polydispersity index of 1.0 to less than 1.7. The modified conjugated diene-based polymer is prepared by continuous polymerization and has remarkable processability, narrow molecular weight distribution and excellent physical properties.

Rubber mixture and tire made by the same
U.S. patent: 11,299,604
Issued: April 12, 2022
Inventor: Shufu Li
Assigned: Zhejiang Geely Holding Group
Key statement: The present disclosure provides a rubber mixture and a tire made the same. The rubber mixture consists essentially of at least one kind of polar or non-polar rubber, at least one kind of filler, at least one kind of vulcanizing agent, at least one kind of accelerant, an optional anti-scorching agent and an optional aromatic material. The accelerant is a compound containing two or more X-Y single bonds, wherein X is selected from elements O and S, and Y is selected from elements N and P. The rubber mixture and the tires of the present disclosure adopt improved accelerants and anti-scorching agents to reduce the generation of pungent volatile organic compounds such as aniline, cyclohexylamine, tert-butylamine and imine, thereby improving the odor problem of the tire. Meanwhile, the present disclosure omits carbon black, zinc oxide and other substances with fine powders, thereby reducing dust hazards to the operators.

Heavy duty pneumatic tire
U.S. patent: 11,299,605
Issued: April 12, 2022
Inventor: Shingo Himeda
Assigned: Sumitomo Rubber Industries
Key statement: Provided is a heavy duty pneumatic tire having excellent abrasion resistance. The heavy duty pneumatic tire includes a tread portion, including a rubber composition containing: an isoprene rubber; a butadiene rubber; a styrene-butadiene rubber; and a carbon black having an average particle size of 20 nm or less and/or a cetyltrimethylammonium bromide adsorption specific surface area of 130 m2/g or more, the tread portion having a land ratio of 81% or higher.

Rubber composition for tires and tire
U.S. patent: 11,306,201
Issued: April 19, 2022
Inventor: Madoka Kimura
Assigned: Bridgestone
Key statement: Provided are a rubber composition for tires having excellent low fuel consumption and having crack resistance and tear resistance, which contains a rubber component (A) containing a synthetic isoprene having a weight-average molecular weight (Mw) of 800,000 or more, a molecular weight distribution (Mw/Mn) of 2.5 or less and a cis-1,4-bond content of 96% or more, a carbon black (B) and a specific carbon black dispersant (C); and a tire using the rubber composition.

Pneumatic tire, and rubber composition for tire
U.S. patent: 11,312,841
Issued: April 26, 2022
Inventors: Shuichiro Ono and Subaru Toya
Assigned: Sumitomo Rubber Industries
Key statement: The present invention provides a pneumatic tire and a rubber composition for tires, which have improved durability at high temperatures and during high speed running while ensuring good ice performance. The present invention relates to a pneumatic tire, including a tread, the tread including blocks having an average ripe density of 1.0 cm/cm2 or higher and an average height of 0.6 to 2.0 cm, the blocks containing a rubber composition having a tan δ at 100°C of 0.179 or less as determined at an initial strain of 10%, a dynamic strain of 2% and a frequency of 10 Hz, and has a ratio of the modulus at 100°C to the modulus at room temperature of 69% or greater as determined in accordance with JIS K6251:2010.

Tire deterioration state prediction method
U.S. patent: 11,312,188
Issued: April 26, 2022
Inventors: Daisuke Tamura, Keiichi Sakai, Shinichiro Yamazaki and Seita Komori
Assigned: Bridgestone
Key statement: A tire deterioration state prediction method for predicting, by a computer, the deterioration state of a tire using a tire model configured from multiple elements comprises an information acquisition step for acquiring information relating to a use environment, which includes the pressure history and the temperature history in an air chamber during tire use, and the history of load acting on the tire, and information relating to the tire characteristics, including the material characteristics of members configuring the tire; a temperature history calculation step for calculating, for each element, the temperature history of the tire on the basis of the information acquired in the information acquisition step; an oxygen concentration history calculation step for calculating, for each element, the oxygen concentration history on the basis of the information and the temperature history of each element; and a tire deterioration state evaluation step for evaluating the deterioration state of the tire on the basis of the oxygen concentration history of each element.

Bissilylaminosilyl-functionalized conjugated dienes and their use in the production of rubbers
U.S. patent: 11,312,843
Issued: April 26, 2022
Inventors: Maria Siolek-Komorek, Radoslaw Kozak, Pawel Weda, Robert Bogacz, Tomasz Skrok, Dawid Bartus and Malgorzata Walenia
Assigned: Synthos
Key statement: The invention relates to bissilylaminosilyl-functionalized conjugated dienes and their use in the production of rubbers. Further, the invention relates to rubbers and rubber compositions.

Elastomer compounds reinforced with silica and products containing same
U.S. patent: 11,312,824
Issued: April 26, 2022
Inventors: Jincheng Xiong, Martin C. Green, William R. Williams, Dmitry Fomitchev, Gerald D. Adler, Duane G. McDonald and Ron Grosz
Assigned: Cabot
Key statement: A silica elastomer composite having superior mechanical properties.

Rubber composition for tire tread, or rubber composition for tire sidewall
U.S. patent: 11,318,788
Issued: May 3, 2022
Inventor: Masaki Kanaya
Assigned: Toyo Tire
Key statement: A rubber composition for tire tread or a rubber composition for tire sidewall, comprising one or more rubber components, and a composite powder which comprises a persimmon fruit extract and sodium carbonate and which is in an amount of 1.0 to 10 parts by mass when a total amount of the rubber component(s) is regarded as 100 parts by mass. In the rubber compositions, it is preferable that in the composite powder, a ratio by mass of the persimmon fruit extract to the sodium carbonate is from 1:1 to 5:1. Moreover, in the rubber compositions, it is preferable that when a total amount of the rubber component(s) is regarded as 100 parts by mass, an effective component amount of the persimmon fruit extract in the composite powder is from 0.01 to 8.0 parts by mass.

Tire manufacturing method and tire
U.S. patent: 11,318,695
Issued: May 3, 2022
Inventors: Takuma Watanabe, Rung Yimpoopha and Sittichai Apaikawin
Assigned: Sumitomo Rubber Industries
Key statement: A tire having a rubber assembly including a first rubber member, a second rubber member and a third rubber member which are arranged in series in the cross-section including the tire rotational axis. The method includes: extruding the unvulcanized rubber assembly as two separate parts which are a first extrusion rubber portion and a second extrusion rubber portion divided at a division surface passing through the unvulcanized first rubber member; winding the first extrusion rubber portion into a base annular body; and forming the unvulcanized rubber assembly by winding the second extrusion rubber portion so that only the first rubber member included in the second extrusion rubber portion overlaps with the first rubber member included in the base annular body.

Masterbatch manufacturing method, rubber composition manufacturing method and tire manufacturing method
U.S. patent: 11,319,416
Issued: May 3, 2022
Inventor: Yuya Konno
Assigned: Toyo Tire
Key statement: A masterbatch manufacturing method comprising: an operation in which a natural rubber latex and a rubber latex having a mass-average molecular weight that is less than a mass-average molecular weight of the natural rubber latex, are mixed to obtain a pre-slurry-mixing rubber latex for which a mass-average-molecular-weight-to-number-average-molecular-weight ratio is 6 to 10; an operation in which the pre-slurry-mixing rubber latex and a filler slurry are mixed to obtain a pre-coagulation liquid mixture; and an operation in which the pre-coagulation liquid mixture is coagulated.

Masterbatch manufacturing method and tire manufacturing method
U.S. patent: 11,319,429
Issued: May 3, 2022
Inventor: Akihito Mitsui
Assigned: Toyo Tire
Key statement: A masterbatch manufacturing method in accordance with the present disclosure comprises an operation in which pre-coagulation rubber latex comprising filler is coagulated to obtain a coagulum; an operation in which the coagulum is dewatered; and an operation in which the dewatered coagulum is plasticized as it is dried by means of an extruder; wherein, during the operation in which the dewatered coagulum is plasticized as it is dried, the coagulum comprises a peptizing agent.

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