Granulated powder of polytetrafluoroethylene for molding and process for the production thereof
US5994499A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 7, 1998 |
| Grant date | Nov 30, 1999 |
| Priority date | — |
| Expiry date | May 7, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2327/18
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
To provide a polytetrafluoroethylene granular powder for molding and a process for preparing the granular powder, in which the granular powder contains only a small number of coarse particles, is obtained with good tumbling efficiency and further no organic liquid is required to be used. The process is for preparing a polytetrafluoroethylene granular powder for molding by granulating a polytetrafluoroethylene powder through tumbling with a granulator having a rotating inclined disc and a rotating side plate; characterized in that the granulator: PA0 (1) comprises a disc inclined to a horizontal level and a side plate provided on the periphery of the disc, PA0 (2) has the side plate assembled in one unit with the disc and rotating together, and PA0 (3) is equipped with an agitator positioned eccentrically to the center of a vortex of the polytetrafluoroethylene powder which is caused by tumbling, or the granulator: PA0 (1) comprises a disc inclined to a horizontal level and a side plate provided on the periphery of the disc, PA0 (2) has the side plate separated from the disc and being rotatable around the periphery of the disc, and PA0 (3) is equipped with an agitator positioned ecc…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.