Pneumatic tyre with built-in self-sealing ply
US8631846B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Jul 30, 2010 |
| Grant date | Jan 21, 2014 |
| Priority date | — |
| Expiry date | Jul 30, 2030 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T152/10666
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A pneumatic tire with a built-in self-sealing layer includes an outer rubbery tread, a carcass reinforcement, a gastight layer located at an inside position relative to the carcass reinforcement, a protective layer located at an innermost position, and a self-sealing layer adjacent to the protective layer and located at an inside position relative to the gastight layer. The protective layer is a thermoplastic film that includes a copolymer formed of at least hard blocks and soft blocks corresponding to a formula:-(BR-BS)n-,where: BR represents a hard block composed of a polyamide or of a blend of polyamides; BS represents a soft block composed of a polyether, a blend of polyethers, or a polyether/polyester copolymer; and n represents a number of (BR-BS) units of the block copolymer, such as, for example, a poly(ether-block-amide) copolymer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.