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US 10,821,778 B2Granted
Tire
AssigneeBridgestone Corporation
InventorsTakashi Harada, Hiroyuki Fudemoto, Kunio Machida
Life of this patent
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Abstract
A tire including a circular tire frame formed of a resin material, and a metal reinforcing cord member wound on the outer circumference of the tire frame, wherein at least a portion of the metal reinforcing cord member is covered by a covering mixture including at least an olefin-based thermoplastic resin and a thermoplastic resin other than the olefin-based thermoplastic resin.
Claims8
A tire comprising:
- a circular tire frame consisting of a polyamide-based thermoplastic elastomer;
- and
- a metal reinforcing cord member wound on an outer circumference of the tire frame,
- wherein at least a portion of the metal reinforcing cord member is covered by a covering mixture that consists of either i) an acid-modified olefin-based thermoplastic resin and a thermoplastic resin other than the acid-modified olefin-based thermoplastic resin, or ii) the acid-modified olefin-based thermoplastic resin, an unmodified olefin-based thermoplastic resin including an olefin having 3 or more carbon atoms as a monomer, and the thermoplastic resin other than the acid-modified olefin-based thermoplastic resin,
- wherein the acid-modified olefin-based thermoplastic resin has an elastic modulus of 140 MPa or greater, and the ratio of the content of the thermoplastic resin other than the acid-modified olefin-based thermoplastic resin in the covering mixture to the total mass of the covering mixture is from 55% by mass to 95% by mass, resulting in the covering mixture having a sea-island structure, wherein the matrix sea phase is formed by the thermoplastic resin other than the acid-modified olefin-based thermoplastic resin, and the dispersed island phase is formed by either i) the acid-modified olefin-based thermoplastic resin when the unmodified olefin-based thermoplastic resin including an olefin having 3 or more carbon atoms as a monomer is not present in the covering mixture, or ii) the combination of the acid-modified olefin-based thermoplastic resin and the unmodified olefin-based thermoplastic resin including an olefin having 3 or more carbon atoms as a monomer when the unmodified olefin-based thermoplastic resin including an olefin having 3 or more carbon atoms as a monomer is present in the covering mixture, and
- wherein an acid value of the acid-modified olefin-based thermoplastic resin is 0.1 mg-CH3ONa/g or greater but less than 20.0 mg-CH3ONa/g.
3 more elements
Dependencies are inferred from the claim text.