Isolation of a fluoropolymer from a latex
Abstract
Abstract WASHED AND DRIED FLUOROPOLYMER PARTICLES FREE OF ANY HARMFUL IMPURITIES CAN BE PREPARED EFFICIENTLY FROM A LATEX BY A PROCESS WHICH COMPRISES THE FOLLOWING STEPS: (A) PROVIDING A LATEX OF A NORMALLY SOLID FLUOROPOLYMER (E.G., AN ELASTOMERIC COPOLYMER OF TETRAFLUOROETHYLENE AND A SUITABLE ETHER OR OLEFIN MONOMER), (B) MIXING THE LATEX WITH A COAGULATING AGENT (E.G., MAGNESIUM CHLORIDE) AND OPTIONALLY WITH AN ALIPHATIC ALCOHOL, (C) PASSING THE RESULTING SLURRY INTO A FIRST HOT WATER BATH WHILE PASSING STEAM THEREIN IN CONTACT WITH THE FLUOROPOLYMER TO FORM FLOATING EASY-TO-FILTER FLUOROPOLYMER PARTICLES, (D) PASSING THE FLOATING FLUOROPOLYMER PARTICLES INTO AT LEAST A SECOND HOT WATER BATH, AND (E) REMOVING WATER FROM THE RESULTING FLOATING AND WASHED FLUOROPOLYMER PARTICLES, FOR EXAMPLE, BY MEANS OF A FILTER AND A DRYING OVEN.
Inventors
- 👤 A Khan
Bibliographic Details
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