Class / Patent application number | Description | Number of patent applications / Date published |
524805000 | Fluorine-containing monomer | 20 |
20090176934 | Copolymers of tetrafluoroethylene - A polymerization process for producing a tetra-fluoroethylene copolymer, and the copolymer produced thereby, are provided. The copolymer is of the dispersion/fine powder type and contains polymerized tetrafluoroethylene monomer units and co-polymerized higher homologous comonomer units having the formula (C | 07-09-2009 |
20090286932 | AQUEOUS FLUORINE-CONTAINING POLYMER DISPERSION - The present invention provides an aqueous fluoropolymer dispersion having good mechanical characteristics and storage stability and containing substantially no fluorinated surfactant. The present invention is related to an aqueous fluoropolymer dispersion comprising a dispersed fluoropolymer particle with an average primary particle diameter of 50 to 400 nm, a surface layer of the dispersed fluoropolymer particle being obtained by emulsion polymerization of a monomer composition consisting of 99.999 to 98 mole percent of tetrafluoroethylene and 0.001 to 2 mole percent of a modifier monomer, a fluorinated surfactant content being not higher than 50 ppm, a fluoropolymer content being 20 to 75% by mass, and a nonfluorinated nonionic surfactant content being 2 to 15% by mass relative to 100% by mass of the fluoropolymer. | 11-19-2009 |
20100036053 | Aqueous Polymerization Process for the Manufacture of Fluoropolymer Comprising Repeating Units Arising from a Perfluoromonomer and a Monomer Having a Functional Group and a Polymerizable Carbon-Carbon Double Bond - Disclosed is an aqueous polymerization process for the manufacture of a fluoropolymer comprising repeating units arising from a perfluoromonomer and a monomer having a functional group and a polymerizable carbon-carbon double bond, comprising: (A) combining water and a perfluoromonomer to form a reaction mixture; (B) initiating polymerization of the perfluoromonomer; (C) polymerizing a portion of the perfluoromonomer to form particles of polymerized perfluoromonomer in the reaction mixture; (D) adding to the reaction mixture a monomer having a functional group and a polymerizable carbon-carbon double bond; and (E) polymerizing the perfluoromonomer and the monomer having a functional group and a polymerizable carbon-carbon double bond in the presence of the particles of polymerized perfluoromonomer to form the fluoropolymer. The fluoropolymer is useful as an adhesive and coating. | 02-11-2010 |
20100160552 | Aqueous Polymerization of Fluorinated Monomer Using Hydrogen Containing Branched Fluoroether Surfactant - A process comprising polymerizing at least one fluorinated monomer in an aqueous medium containing initiator and fluorosurfactant having the formula (I) | 06-24-2010 |
20110092644 | AQUEOUS DISPERSION POLYMERIZATION PROCESS FOR ETHYLENE/TETRAFLUOROETHYLENE COPOLYMER - A polymerization process is provided to form a copolymer of ethylene with tetrafluoroethylene and a modifying monomer having a side chain containing at least two carbon atoms by initiating the polymerization in an aqueous medium with a fluoromonomer that forms a stable dispersion of polymer particles from the fluoromonomer in the aqueous medium, which forms polymerization sites for further polymerization, and carrying the further polymerization by copolymerizing the ethylene, tetrafluoroethylene, and modifying monomer as a dispersion in at least said aqueous medium to a polymer solids content of at least 15 wt %, said copolymer comprising at least 60 wt % of the total polymer content of the polymer solids. | 04-21-2011 |
20120004367 | METHOD FOR PRODUCING AQUEOUS DISPERSION OF FLUORINE-CONTAINING SEED POLYMER PARTICLES AND AQUEOUS COATING COMPOSITION AND COATED ARTICLE THEREOF - There is provided a method for producing an aqueous dispersion of fluorine-containing seed polymer (B) particles, comprising a step for preparing an aqueous dispersion of fluorine-containing polymer (A) particles by polymerizing monomer comprising at least one fluoroolefin in an aqueous dispersion in the presence of a compound (1) represented by the formula: CH | 01-05-2012 |
20120116016 | VINYL FLUORIDE POLYMERIZATION AND AQUEOUS DISPERSION OF VINYL FLUORIDE POLYMER - A process for producing vinyl fluoride polymer comprising polymerizing vinyl fluoride in an aqueous polymerization medium containing initiator and halogen-free surfactant with a critical micelle concentration of less than about 0.05 weight percent at 25° C. The halogen-free surfactant is present in the aqueous polymerization medium in an amount less than about 0.1 weight percent based on the weight of the aqueous polymerization medium. The aqueous polymerization medium is essentially free of halogen-containing surfactant. | 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 |
20120142858 | AQUEOUS PROCESS FOR MAKING FLUOROPOLYMERS - A novel aqueous polymerization process for making fluoropolymer dispersions is disclosed in which non-ionic non-fluorinated emulsifier is used to produce fluoropolymer emulsions. The emulsifiers contain blocks of polyethylene glycol, polypropylene glycol and/or polytetramethylene glycol. The process and fluoropolymer produced contain no fluorinated surfactant. The fluoropolymers have excellent resistance to discoloration. | 06-07-2012 |
20120202946 | Process for the isolation of sulfonyl fluoride polymers and polymers obtained therefrom - The invention relates to a process for the isolation of (per)fluorinated polymers containing sulfonyl fluoride functional groups from a polymerization latex. The process comprises adding the polymerization latex to an aqueous electrolyte solution under high shear stirring at a temperature equal to or lower than the glass transition temperature of the polymer. The invention further relates to the (per)fluorinated polymers containing sulfonyl fluoride functional groups isolated by the process and characterised by a loss of weight at 200° C. lower than 1% as determined by thermogravimetric analysis. | 08-09-2012 |
20130225764 | FLUOROPOLYMER DISPERSION AND PROCESS FOR PRODUCING FLUOROPOLYMER DISPERSION - A method for producing a fluoropolymer dispersion where a fine particle containing a fluoropolymer is dispersed in an aqueous dispersion medium, the fluoropolymer having a sulfonic acid group, and the method including a polymerization reaction step of emulsion polymerizing a fluorovinyl ether derivative and a fluorine-containing ethylenic monomer to give a fluoropolymer precursor, a hydrolysis step of hydrolyzing, in an aqueous medium, —SO | 08-29-2013 |
20130331516 | AQUEOUS POLYMERIZATION OF FLUORINATED MONOMER USING POLYMERIZATION AGENT COMPRISING FLUOROPOLYETHER ACID OR SALT AND SHORT CHAIN FLUOROSURFACTANT - A process comprising polymerizing at least one fluorinated monomer in an aqueous medium containing initiator and polymerization agent to form an aqueous dispersion of particles of fluoropolymer, the polymerization agent comprising:
| 12-12-2013 |
20140005333 | MICROEMULSIONS AND FLUOROPOLYMERS MADE USING MICROEMULSIONS | 01-02-2014 |
20150148482 | METHOD FOR PRODUCING AQUEOUS FLUORINE-CONTAINING POLYMER DISPERSING ELEMENT, AND PURIFIED AQUEOUS FLUORINE-CONTAINING POLYMER DISPERSING ELEMENT - A method for preparing a fluoropolymer aqueous dispersion, including: step (A) of preparing a fluoropolymer aqueous dispersion comprising a fluoropolymer having at least one selected from the group consisting of —SO | 05-28-2015 |
20150291714 | PARTIALLY FLUORINATED POLYMERS - A method of making a partially fluorinated polymer dispersions and resulting aqueous mixtures. The method comprising polymerizing one or more fluorinated monomers in an aqueous emulsion polymerization in the presence of a polymerizable fluorinated emulsifier to form a fluorinated polymer. The polymerizable fluorinated emulsifier has the formula X | 10-15-2015 |
20150299341 | PRODUCTION METHOD FOR POLYTETRAFLUOROETHYLENE AQUEOUS DISPERSION - The present invention aims to provide a method of producing a fluoropolymer aqueous dispersion having a significantly small particle size and excellent dispersion stability without using a long-chain fluorosurfactant. The present invention relates to a method of producing an aqueous dispersion containing at least one fluoropolymer selected from the group consisting of polytetrafluoroethylene and melt-processible fluororesins excluding polytetrafluoroethylene. The method includes polymerizing a fluoromonomer in an aqueous medium in the presence of a fluorosurfactant having a Log POW value of not higher than 3.4 and a polymerization initiator. The amount of the fluorosurfactant corresponds to 4600 to 500000 ppm of the aqueous medium. | 10-22-2015 |
20150299342 | PRODUCTION METHOD FOR POLYTETRAFLUOROETHYLENE AQUEOUS DISPERSION - The present invention aims to provide a method of producing a PTFE aqueous dispersion which contains PTFE particles having a small particle size and which is excellent in dispersion stability by multistage polymerization without using a long-chain fluorosurfactant. The method includes the steps of: (1) polymerizing a fluoromonomer in an aqueous medium in the presence of a fluorosurfactant and a polymerization initiator to provide an aqueous dispersion containing particles of at least one fluoropolymer selected from the group consisting of PTFE and melt-processible fluororesins excluding polytetrafluoroethylene; and (2) polymerizing TFE alone or TFE and a modifying monomer in an aqueous medium in the presence of the fluoropolymer particles and a polymerization initiator to provide an aqueous dispersion containing PTFE particles. The fluoropolymer particles have an equivalent weight (EW) of 6,000 or more and a volume average particle size of not smaller than 0.1 nm but smaller than 20 nm. | 10-22-2015 |
20150299447 | VINYL FLUORIDE POLYMERIZATION AND AQUEOUS DISPERSION OF VINYL FLUORIDE POLYMER - A process for producing vinyl fluoride polymer comprising polymerizing vinyl fluoride in an aqueous polymerization medium containing initiator and halogen-free surfactant with a critical micelle concentration of less than about 0.05 weight percent at 25° C. The halogen-free surfactant is present in the aqueous polymerization medium in an amount less than about 0.1 weight percent based on the weight of the aqueous polymerization medium. The aqueous polymerization medium is essentially free of halogen-containing surfactant. An aqueous dispersion comprising vinyl fluoride polymer particles present in a range of from about 5 to about 40 weight percent based on the weight of the aqueous phase, wherein said vinyl fluoride polymer particles have a D | 10-22-2015 |
20150315342 | PROCESS FOR PRODUCING POLYTETRAFLUOROETHYLENE MOLDING POWDER AND PROCESS FOR PRODUCING POLYTETRAFLUOROETHYLENE AGGLOMERATED PRODUCT - To provide a process for producing a PTFE molding powder having a high bulk density from granular polymer particles without using an emulsifying agent having problems of bioaccumulation and toxicity. | 11-05-2015 |
20160122522 | HIGHLY FLUORINATED POLYMERS - A method of making a highly fluorinated polymers and resulting aqueous mixtures. The method comprising polymerizing one or more perfluorinated monomers in an aqueous emulsion polymerization in the presence of a polymerizable fluorinated emulsifier to form a perfluorinated polymer. The polymerizable fluorinated emulsifier has the formula X | 05-05-2016 |