Patent application number | Description | Published |
20120116003 | Aqueous Polymerization of Perfluoromonomer Using Hydrocarbon Surfactant - A process is provided for the polymerization of fluoromonomer to an dispersion of fluoropolymer particles in an aqueous medium in a polymerization reactor, by (a) providing the aqueous medium in the reactor, (b) adding the fluoromonomer to the reactor, (c) adding initiator to the aqueous medium, the combination of steps (b) and (c) being carried out essentially free of hydrocarbon-containing surfactant and resulting in the kickoff of the polymerization of the fluoromonomer, and (d) metering hydrocarbon-containing surfactant into the aqueous medium after the kickoff of polymerization, e.g. after the concentration of the fluoropolymer in the aqueous medium is at least 0.6 wt %, the metering being at a rate reducing the telogenic activity of said surfactant while maintaining surface activity. | 05-10-2012 |
20120116015 | Reducing the Telogenic Behavior of Hydrocarbon-Containing Surfactants in Aqueous Dispersion Fluoromonomer Polymerization - A polymerization process is provided, comprising polymerizing fluoromonomer in an aqueous medium to form a dispersion of fluoropolymer particles in the aqueous medium, said polymerizing being carried out in the presence of (i) polymerization initiator, and (ii) hydrocarbon-containing surfactant stabilizing the dispersion of fluoropolymer particles, the hydrocarbon-containing surfactant being passivated to reduce its the telogenic behavior. | 05-10-2012 |
20120116017 | Nucleation in Aqueous Polymerization of Fluoromonomer - A process is provided for polymerizing fluoromonomer in an aqueous medium, wherein a dispersion of essentially surfactant-free hydrocarbon-containing oleophilic nucleation sites is first formed in the aqueous medium, and then polymerization is commenced to form a dispersion of fluoropolymer particles at the oleophilic nucleation sites, wherein the nucleation sites can be derived from hydrocarbon-containing compound. The surfactant used to stabilize the fluoropolymer dispersion can also be hydrocarbon-containing. | 05-10-2012 |
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 |
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 |
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 |
20140018499 | Nucleation in Aqueous Polymerization of Fluoromonomer - A process is provided for polymerizing fluoromonomer in an aqueous medium, wherein a dispersion of essentially surfactant-free hydrocarbon-containing oleophilic nucleation sites is first formed in the aqueous medium, and then polymerization is commenced to form a dispersion of fluoropolymer particles at the oleophilic nucleation sites, wherein the nucleation sites can be derived from hydrocarbon-containing compound. The surfactant used to stabilize the fluoropolymer dispersion can also be hydrocarbon-containing. | 01-16-2014 |