Sealing member and process cartridge
US8139975B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 9, 2009 |
| Grant date | Mar 20, 2012 |
| Priority date | — |
| Expiry date | Oct 29, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/0898
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Provided is a sealing member for preventing leakage of a developer from a developer containing portion of a process cartridge detachable from a main body of an electrophotographic image forming apparatus to an outside of the developer containing portion. The sealing member is made of a thermoplastic elastomer that contains at least a copolymer and a plasticizer. In a molecular weight distribution of a tetrahydrofuran soluble matter of the thermoplastic elastomer measured by gel permeation chromatography, at least one peak is present in each of a region of a molecular weight of 4,000 or less and a region of a molecular weight of 30,000 to 200,000, and a percentage of a component of a molecular weight of 800 or less in a region of a molecular weight of 5,000 or less is 30% or less.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.