Polyimide based purge media and methods relating thereto
US8309223B2 · kind B2 · utility
0Cited by
8References
8Claims
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Inventor
Key dates
| Filing date | Dec 21, 2010 |
| Grant date | Nov 13, 2012 |
| Priority date | — |
| Expiry date | Jul 26, 2031 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2982
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method is disclosed for the manufacture of a powdered polyimide extrudate for use as a purge media. The method includes feeding a polyimide film material into an extruder having a first zone that provides heating and a subsequent second zone that provides endothermic shearing. In one embodiment, the resulting purge media comprises a sheared polyimide powder having an average particle size in a range of about 5 to 100 microns (or any sub-range thereof). The purge media can comprises up to 35 weight percent other additives.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.