Granular powder of modified polytetrafluoroethylene
US6300408A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 15, 1999 |
| Grant date | Oct 9, 2001 |
| Priority date | — |
| Expiry date | Sep 15, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2327/18
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
To provide a modified PTFE granular powder which has a large apparent density, a small average particle size, a narrow particle size distribution, an electrostatic charge substantially approximate to zero, a small angle of repose and being excellent in powder characteristics, particularly particle stability. The modified PTFE powder is granulated with stirring in water under coexistence of an organic liquid which forms liquid-liquid interface with water and a nonionic surfactant of segmented polyalkylene glycols which has a hydrophobic segment and a hydrophilic segment. A molded article obtained from the granular powder is excellent in tensile strength and elongation and has a small surface roughness, a large break down voltage and a large whiteness (Z value).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.