Method for concentrating aqueous dispersion of fluorine-containing polymer
US6136893A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 13, 1998 |
| Grant date | Oct 24, 2000 |
| Priority date | — |
| Expiry date | Oct 13, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F6/20
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
To provide the method for concentrating an aqueous dispersion of fluorine-containing polymer particles containing a surfactant, which is applicable to a fluorine-containing polymer such as PTFE being easily fibrilated and assures low energy, low cost and short term concentration only by using various kinds of surfactants in a small amount. The method for concentrating an aqueous dispersion of fluorine-containing polymer particles containing the surfactant by feeding the aqueous dispersion of fluorine-containing polymer particles containing the surfactant in an amount of 2.0 to 8.0% by weight based on a solid content of the fluorine-containing polymer to a micro filtration membrane having a pore size of 0.01 to 1 .mu.m with aqueous dispersion feeding means which does not substantially generate shearing force and then removing an aqueous medium containing the surfactant from the aqueous dispersion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.