Conveyor belt pulley cover combining low rolling resistance with enhanced ozone resistance
US10766703B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 3, 2019 |
| Grant date | Sep 8, 2020 |
| Priority date | — |
| Expiry date | Apr 3, 2039 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2205/035
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Conveyor belts having an outer cover layer, an opposing inner cover layer, and a carcass disposed between the outer and inner cover layers. The outer cover layer includes a sulfur cured rubber formulation formed from a blend including from about 20 phr to about 40 phr of an EPDM elastomer, from about 1 phr to about 40 phr of a polybutadiene rubber, and from about 30 phr to about 80 phr of a natural rubber. The sulfur cured rubber formulation may include a sulfur curative in an amount of from about 1.0 phr to about 4.0 phr. The sulfur cured rubber formulation may exhibits no cracking under dynamic ozone testing conditions of 50 pphm ozone, 25% strain, and 40 deg C., at 168 hours, in accordance with ASTM D1149, and may have a rolling resistance factor value of from 0.05 to 0.06 at a temperature of 25 deg C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.