Filled granular polytetrafluoroethylene powder
US6350801B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 22, 1999 |
| Grant date | Feb 26, 2002 |
| Priority date | — |
| Expiry date | Oct 22, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2327/18
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
To provide a filler-containing PTFE granular powder, which has a large apparent density, a small average particle size, a narrow particle size distribution, a superior powder flowability and a small electrostatic charge, and gives a molded product having a superior tensile strength and elongation, a lower surface roughness and a high whiteness, and a process for preparing the same. The granular powder is prepared by forming a PTFE powder and a filler into an aqueous slurry by using an organic liquid forming liquid-liquid interface with water and a nonionic surfactant having a hydrophobic segment and a hydrophilic segment, and then granulating in combination of stirring and deagglomerating.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.