Electroconductive roller
US7445588B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Mar 8, 2005 |
| Grant date | Nov 4, 2008 |
| Priority date | — |
| Expiry date | Apr 5, 2027 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/1376
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
An electroconductive roller including an electroconductive cellular material layer, comprised of a polyurethane composition, which has an average foamed cell diameter not more than 100 μm and a variation ΔD of the foamed cell diameter not more than 50 μm. The electroconductive roller has a hardness variation ΔHs not more than 8 degrees and a circumferential non-uniformity index RMAX/RMIN in an electric resistance thereof not more than 1.3. The electroconductive cellular material layer is made of a thermosetting one-part polyurethane composition. And the polyurethane composition is cured instantly at a temperature not less than a thermosetting critical temperature for curing thereof, after it is foamed by a mechanical foaming method.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.