Pneumatic tire including discharge terminal parts
US6269854A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 17, 1997 |
| Grant date | Aug 7, 2001 |
| Priority date | — |
| Expiry date | Oct 17, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S152/02
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A pneumatic tire has a tread portion including a tread cap rubber defining the tread face and a tread base rubber disposed radially inside the tread cap. The tread base rubber includes a collector part which is disposed radially inside the tread cap rubber, and discharge terminal parts each of which extends radially outwardly from the collector part to the tread face, penetrating the tread cap rubber. The insulation rubber material is compounded from: 100 parts by weight of a rubber base comprising one or more materials selected from diene rubber and copolymers of a conjugated diene monomer and an aromatic vinyl compound; 30 to 100 parts by weight of silica; and 3 to 20 parts by weight of carbon black. The first electrically conductive rubber material is compounded from: 100 parts by weight of a rubber base comprising one or more materials selected from diene rubber and copolymers of a conjugated diene monomer and an aromatic vinyl compound; 0 to 50 parts by weight of silica; and not less than 25 parts by weight of carbon black. The hardness Hs1 of the insulation rubber material is not more than the hardness Hs2 of the first electrically conductive rubber material at a temperature …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.