Method for producing ethylene-tetrafluoroethylene copolymer powder
US9328178B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 22, 2014 |
| Grant date | May 3, 2016 |
| Priority date | — |
| Expiry date | Mar 18, 2034 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2327/18
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Provided is a method for producing an ethylene-tetrafluoroethylene copolymer powder, whereby it is possible to simply and inexpensively produce an ethylene-tetrafluoroethylene copolymer powder excellent in handling efficiency from a slurry having an ethylene-tetrafluoroethylene copolymer dispersed in a fluorinated organic solvent. A method for producing an ethylene-tetrafluoroethylene copolymer powder, which comprises feeding, at a feeding linear velocity exceeding 0.10 m/sec., a slurry having ethylene-tetrafluoroethylene copolymer microparticles dispersed in a specific fluorinated organic solvent, to a centrifugal thin-film evaporator 12 having a cylindrical heat-conducting barrel 34, a first heating portion 44 for heating the heat-conducting barrel 34, and a rotary stirring portion 42 wherein a rotary shaft 38 is provided with stirring blades 40 for rotation in the heat-conducting barrel 34 so that a thin film is formed on the inside wall surface 34a of the heat-conducting barrel 34, to obtain an ethylene-tetrafluoroethylene copolymer powder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.