Process for producing aqueous fluorinated polymer dispersion having reduced content of fluorinated emulsifier
US7834137B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 1, 2009 |
| Grant date | Nov 16, 2010 |
| Priority date | — |
| Expiry date | May 1, 2029 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F214/26
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Provided is a process for producing an aqueous fluorinated polymer dispersion having a reduced content of a fluorinated emulsifier by using a weakly basic anion-exchange resin to adsorb and remove a fluorinated emulsifier with excellent efficiency from an aqueous fluorinated polymer dispersion. Also provided is a process for producing an aqueous fluorinated polymer dispersion having a reduced content of a fluorinated emulsifier, wherein the process includes: adding an organic carboxylic acid represented by the following formula (1):Q(CH2)m(CH(OH))nCOOH (1)wherein Q is H, CH3 or COOH, m and n each independently represent 0 or an integer of from 1 to 4, and 4≧n+m≧1, to an aqueous fluorinated polymer dispersion containing a fluorinated emulsifier; and then contacting with a weakly basic anion-exchange resin to adsorb and remove the fluorinated emulsifier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.