Bridgestone has filed a patent for a method of preparing retreaded tires. The method involves applying a primer composition and a urethane-based adhesive to the tire casing and pre-cured tread, mating them together, and allowing the adhesive to cure, resulting in a retreaded tire. GlobalData’s report on Bridgestone gives a 360-degree view of the company including its patenting strategy. Buy the report here.
According to GlobalData’s company profile on Bridgestone, anti-skid tyre treads was a key innovation area identified from patents. Bridgestone's grant share as of June 2023 was 1%. Grant share is based on the ratio of number of grants to total number of patents.
Method for preparing a retreaded tire using primer and adhesive
A recently filed patent (Publication Number: US20230202129A1) describes a method for preparing a retreaded tire. The method involves several steps, including providing a tire casing and a pre-cured tire tread, applying a primer composition to the tire casing and/or the pre-cured tread to form at least one primer layer, and applying a urethane-based adhesive composition to the tire casing, adhesive layer, pre-cured tread, or primer layer. The pre-cured tread is then mated to the tire casing, sandwiching the adhesive layer between them to form a pre-cured composite. The adhesive layer is allowed to cure, resulting in a retreaded tire.
The primer composition used in this method includes a halogenating agent and a solvent. The halogenating agent can be trichloroisocyanuric acid (TCI), 1,3-dichloro-5,5dimethylhydantoine (DHN), sodium dichloroisocyanurate (DCI), or combinations thereof. The solvent can be methanol, ethanol, isopropanol, heptane, hexane, water, or combinations thereof. In some cases, the solvent may specifically include water or be a mixture of alcohol and water.
The adhesive composition used in this method can be a two-part polyurethane adhesive or a one-part polyurethane adhesive. The curing of the adhesive layer can take place at a temperature of less than 100°C and pressures of less than 100 PSI relative to atmospheric pressure. It is also possible for the adhesive to cure without applying pressure on the polyurethane adhesive.
The retreaded tire produced by this method can be a pneumatic tire. The primer composition typically has a solids content of less than 10 wt %. The adhesive, if it is a one-part polyurethane adhesive, should have a Brookfield viscosity of less than 100 cPs. The primer composition is applied within 10 minutes of being formulated, and the application of the primer composition to the tire casing may involve applying from two to six layers, or specifically four to five layers.
This patent application outlines a detailed method for preparing retreaded tires using specific primer and adhesive compositions. The method offers flexibility in terms of the choice of halogenating agent, solvent, and adhesive type. The curing process can be carried out at relatively low temperatures and pressures, and the application of the primer composition allows for multiple layers to be applied to the tire casing. Overall, this method provides a potential solution for efficiently and effectively retreading tires, extending their lifespan and reducing waste.
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