Yokohama Rubber has been granted a patent for a pneumatic tire design. The tire includes an innerliner and a tie rubber, with specific compositions for each. The innerliner rubber composition contains carbon black, resin, and zinc oxide, while the tie rubber composition includes a specific diene rubber. The patent also specifies that the dynamic storage modulus at -45°C of the innerliner rubber composition should not exceed 600 Mpa. GlobalData’s report on Yokohama Rubber gives a 360-degree view of the company including its patenting strategy. Buy the report here.
According to GlobalData’s company profile on Yokohama Rubber, Anti-skid tyre treads was a key innovation area identified from patents. Yokohama Rubber's grant share as of September 2023 was 33%. Grant share is based on the ratio of number of grants to total number of patents.
Patent granted for a pneumatic tire with specific rubber composition
A recently granted patent (Publication Number: US11766891B2) describes a pneumatic tire with specific compositions and properties. The tire includes an innerliner and a tie rubber composition. The tie rubber composition consists of a first diene rubber, which can be natural rubber, isoprene rubber, styrene-butadiene rubber, or a combination of these rubbers. The innerliner rubber composition, which constitutes the innerliner, contains carbon black with a specific nitrogen adsorption specific surface area, a total resin content, and zinc oxide. The second diene rubber in the tire contains halogenated butyl rubber and has a dynamic storage modulus at -45°C that is not greater than 600 Mpa.
In addition to the composition, the patent also claims specific performance characteristics for the tire. The innerliner rubber composition should have a high number of cycles to fracture in a constant strain fatigue test, with a minimum of 800,000 cycles at a strain ratio of 120% and a frequency of 6.67 Hz. The ratio of rubber hardness between the tie rubber composition and the innerliner rubber composition should be not less than 1.1. Furthermore, the innerliner rubber composition can have a total zinc oxide content ranging from 0.1 to 0.8 parts by mass.
The patent also provides variations of the tire composition. The tie rubber composition can include isoprene rubber or butadiene rubber. The innerliner rubber composition can have a total zinc oxide content ranging from 0.1 to 0.7 parts by mass. The ratio of rubber hardness between the tie rubber composition and the innerliner rubber composition can range from not less than 1.1 to not more than 1.13.
This patent aims to protect a specific formulation and performance characteristics of a pneumatic tire. The tire's composition and properties, as described in the claims, may offer advantages in terms of durability, fatigue resistance, and rubber hardness. The patent provides a detailed framework for manufacturing a tire with these specific features, potentially leading to improved performance and longevity in various applications.