Filled particulate powder of polytetrafluoroethylene and process for preparing the same
US6451903B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 16, 1999 |
| Grant date | Sep 17, 2002 |
| Priority date | — |
| Expiry date | Sep 16, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2327/18
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Filler-containing polytetrafluoroethylene granular powder, which has a large apparent density, a small average particle size, a narrow particle size distribution, a superior powder flowability, a small electrostatic charge and gives a molded product having a superior tensile strength and elongation a high degree of whiteness and a low surface roughness, and a process for preparing the same. The granulation is carried out by stirring, in water, of a PTFE powder and a filler in the presence of an organic liquid forming liquid-liquid interface with water and an anionic surfactant and/or nonionic surfactant such as a segmented polyalkylene glycol having a hydrophobic segment and hydrophilic segment and deagglomerating of the powder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.