Patent application number | Description | Published |
20080221301 | Reduced Fuming Fluoropolymer - The present invention relates to the reduction of oligomer content of melt-processible fluoropolymer so that the fluoropolymer has at least 25 ppm less oligomer than the as-polymerized fluoropolymer. | 09-11-2008 |
20090281241 | Aqueous Polymerization of Fluorinated Monomer Using a Mixture of Fluoropolyether Acids or Salts - A composition comprising a mixture of fluoropolyether acids or salts having a number average value of about 800 to about 2500 g/mol. The amount of fluoropolyether acids or salt in the mixture having a molecular weight of not more than 500 g/mol is not more than 50 ppm by weight of the total amount of fluoropolyether acids or salts in the mixture. The amount of fluoropolyether acids or salts in the mixture having a molecular weight of 2500 g/mol or greater is not more than 40% by weight of the total amount of fluoropolyether acids or salts in the mixture. Preferably the fluoropolyether acids or salts comprise an anionic group selected from the group consisting of carboxylate, sulfonate, sulfonamide anion and phosphonate. Also disclosed is an aqueous dispersion polymerization process for fluoropolymer manufacture employing polymerization agent comprising the specified mixture of fluoropolyether acids or salts. | 11-12-2009 |
20120004365 | Aqueous Polymerization of Fluorinated Monomer Using a Mixture of Fluoropolyether Acids or Salts - A composition comprising a mixture of fluoropolyether acids or salts having a number average value of about 800 to about 2500 g/mol. The amount of fluoropolyether acids or salt in the mixture having a molecular weight of not more than 500 g/mol is not more than 50 ppm by weight of the total amount of fluoropolyether acids or salts in the mixture. The amount of fluoropolyether acids or salts in the mixture having a molecular weight of 2500 g/mol or greater is not more than 40% by weight of the total amount of fluoropolyether acids or salts in the mixture. Preferably the fluoropolyether acids or salts comprise an anionic group selected from the group consisting of carboxylate, sulfonate, sulfonamide anion and phosphonate. Also disclosed is an aqueous dispersion polymerization process for fluoropolymer manufacture employing polymerization agent comprising the specified mixture of fluoropolyether acids or salts. | 01-05-2012 |
20130217849 | AQUEOUS POLYMERIZATION OF FLUORINATED MONOMER USING A MIXTURE OF FLUOROPOLYETHER ACIDS OR SALTS - A composition comprising a mixture of fluoropolyether acids or salts having a number average value of about 800 to about 2500 g/mol. The amount of fluoropolyether acids or salt in the mixture having a molecular weight of not more than 500 g/mol is not more than 50 ppm by weight of the total amount of fluoropolyether acids or salts in the mixture. The amount of fluoropolyether acids or salts in the mixture having a molecular weight of 2500 g/mol or greater is not more than 40% by weight of the total amount of fluoropolyether acids or salts in the mixture. Preferably the fluoropolyether acids or salts comprise an anionic group selected from the group consisting of carboxylate, sulfonate, sulfonamide anion and phosphonate. Also disclosed is an aqueous dispersion polymerization process for fluoropolymer manufacture employing polymerization agent comprising the specified mixture of fluoropolyether acids or salts. | 08-22-2013 |
20130303650 | FLUOROPOLYMER DISPERSION TREATMENT EMPLOYING ULTRAVIOLET LIGHT AND OXYGEN SOURCE TO REDUCE FLUOROPOLYMER RESIN DISCOLORATION - Process for reducing thermally induced discoloration of fluoropolymer resin produced by polymerizing fluoromonomer in an aqueous dispersion medium to form aqueous fluoropolymer dispersion and isolating said fluoropolymer from said aqueous medium to obtain said fluoropolymer resin. The process comprises:
| 11-14-2013 |
20130303652 | Fluoropolymer Dispersion Treatment Employing Light and Oxygen Source in Presence of Photocatalyst to Reduce Fluoropolymer Resin Discoloration - Process for reducing thermally induced discoloration of fluoropolymer resin produced by polymerizing fluoromonomer in an aqueous dispersion medium to form aqueous fluoropolymer dispersion and isolating said fluoropolymer from said aqueous medium to obtain said fluoropolymer resin. The process comprises:
| 11-14-2013 |
20130303701 | Employing Pretreatment and Fluorination of Fluoropolymer Resin to Reduce Discoloration - Process for reducing thermally induced discoloration of fluoropolymer resin produced by polymerizing fluoromonomer in an aqueous dispersion medium to form aqueous fluoropolymer dispersion and isolating said fluoropolymer from the aqueous medium by separating fluoropolymer resin in wet form from the aqueous medium and drying to produce fluoropolymer resin in dry form. The process comprises:
| 11-14-2013 |
20130303707 | Fluorination of Fluoropolymer Resin to Reduce Discoloration - Process for reducing thermally induced discoloration of fluoropolymer resin produced by polymerizing fluoromonomer in an aqueous medium to form aqueous fluoropolymer dispersion and isolating said fluoropolymer from said aqueous medium to obtain said fluoropolymer resin. The process comprises:
| 11-14-2013 |
20130303708 | Fluoropolymer Dispersion Treatment Employing Hypochlorite Salts or Nitrite Salts to Reduce Fluoropolymer Resin Discoloration - Process for reducing thermally induced discoloration of fluoropolymer resin produced by polymerizing fluoromonomer in an aqueous dispersion medium to form aqueous fluoropolymer dispersion and isolating said fluoropolymer from said aqueous medium to obtain said fluoropolymer resin. The process comprises:
| 11-14-2013 |
20130303709 | Fluoropolymer Dispersion Treatment Employing High pH and Oxygen Source to Reduce Fluoropolymer Resin Discoloration - Process for reducing thermally induced discoloration of fluoropolymer resin produced by polymerizing fluoromonomer in an aqueous dispersion medium to form aqueous fluoropolymer dispersion and isolating said fluoropolymer from said aqueous medium to obtain said fluoropolymer resin. The process comprises:
| 11-14-2013 |
20130303710 | Fluoropolymer Dispersion Treatment Employing Hydrogen Peroxide to Reduce Fluoropolymer Resin Discoloration - Process for reducing thermally induced discoloration of fluoropolymer resin produced by polymerizing fluoromonomer in an aqueous dispersion medium to form aqueous fluoropolymer dispersion and isolating said fluoropolymer from said aqueous medium to obtain said fluoropolymer resin. The process comprises:
| 11-14-2013 |
20130303715 | Fluoropolymer Resin Treatment Employing Heating and Oxygen Source to Reduce Discoloration - Process for reducing thermally induced discoloration of fluoropolymer resin produced by polymerizing fluoromonomer in an aqueous medium to form aqueous fluoropolymer dispersion and isolating said fluoropolymer from said aqueous medium to obtain said fluoropolymer resin. The process comprises:
| 11-14-2013 |
20130303716 | Drying Wet Fluoropolymer Resin and Exposing to Oxygen Source to Reduce Discoloration - Process for reducing thermally induced discoloration of fluoropolymer resin produced by polymerizing fluoromonomer in an aqueous dispersion medium to form aqueous fluoropolymer dispersion and isolating fluoropolymer from said aqueous medium by separating wet fluoropolymer resin from the aqueous medium and drying to produce fluoropolymer resin. The process comprises:
| 11-14-2013 |
20130303717 | Fluoropolymer Dispersion Treatment Employing Oxidizing Agent to Reduce Fluoropolymer Resin Discoloration - A process for reducing thermally induced discoloration of fluoropolymer resin produced by polymerizing fluoromonomer in an aqueous dispersion medium to form aqueous fluoropolymer dispersion and isolating said fluoropolymer from the aqueous medium to obtain the fluoropolymer resin. The process comprises:
| 11-14-2013 |
20130303718 | Fluoropolymer Dispersion Treatment Employing Oxidizing Agent to Reduce Fluoropolymer Resin Discoloration - A process for reducing thermally induced discoloration of fluoropolymer resin produced by polymerizing fluoromonomer in an aqueous dispersion medium to form aqueous fluoropolymer dispersion and isolating said fluoropolymer from the aqueous medium to obtain the fluoropolymer resin. The process comprises:
| 11-14-2013 |
20130345368 | Fluoropolymer Resin Treatment Employing Melt Extrusion and Exposure to Oxygen Source to Reduce Discoloration - Process for reducing thermally induced discoloration of melt-processible fluoropolymer resin produced by polymerizing fluoromonomer in an aqueous medium to form aqueous fluoropolymer dispersion and isolating said fluoropolymer from said aqueous medium to obtain said fluoropolymer resin. The process comprises:
| 12-26-2013 |
20140256895 | FLUOROPOLYMER RESIN TREATMENT EMPLOYING SORBENT TO REDUCE FLUOROPOLYMER RESIN DISCOLORATION - A process for reducing thermally induced discoloration of fluoropolymer resin produced by polymerizing fluoromonomer in an aqueous dispersion medium to form aqueous fluoropolymer dispersion and isolating the fluoropolymer from the aqueous medium to obtain fluoropolymer resin. The process comprises:
| 09-11-2014 |