Polytetrafluoroethylene mixed powder used for insulation of product for high frequency signal transmission and product for high frequency signal transmission using the same
US6987224B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 29, 2001 |
| Grant date | Jan 17, 2006 |
| Priority date | — |
| Expiry date | Sep 20, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05K2201/0212
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A polytetrafluoroethylene mixed powder, which is obtained by mixing low molecular weight polytetrafluoroetylene powder and high molecular weight polytetrafluoroethylene powder obtained by emulsion polymerization of tetrafluoroethylene, wherein the low molecular weight polytetrafluoroetylene powder has a number average molecular weight of 1,000,000±500,000 and a maximum peak temperature of 327±5° C. in the endothermic curve appearing on the crystalline melting curve obtained by using a differential scanning calorimeter, the high molecular weight polytetrafluoroetylene powder has a number average molecular weight of 4,500,000±1,000,000 and a maximum peak temperature of 340±7° C. in the endothermic curve appearing on the crystalline melting curve obtained by using a differential scanning calorimeter, and the mixed powder has evident peak temperatures of 327±5° C. and 340±7° C. in the endothermic curve appearing on the crystalline melting curve obtained by using a differential scanning calorimeter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.