Patents Assigned to Dyneon GmbH
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Publication number: 20030204011Abstract: Aqueous dispersions of fluoropolymers obtained by emulsion polymerization and containing at least one fluoropolymer A) with an average particle size (number-average) of at least 200 nm and at least one fluoropolymer B) with an average particle size (number-average) of not more than 100 nm, one of components A) and B) being a thermoplastic and the other component not being processable from the melt, and the entire dispersion having a non-monomodal number distribution of particle diameter, are suitable for saturating, impregnating surfaces, for example of fibers or sheet-like articles made from fibers or porous materials, in particular for coating glass-fiber fabrics as well as for formulating metal-coating systems.Type: ApplicationFiled: April 3, 2003Publication date: October 30, 2003Applicant: Dyneon GmbHInventors: Hermann Bladel, Gernot Lohr, Brigitte Grossmann
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Patent number: 6566452Abstract: Aqueous dispersions of fluoropolymers obtained by emulsion polymerization and containing at least one fluoropolymer A) with an average particle size (number-average) of at least 200 nm and at least one fluoropolymer B) with an average particle size (number-average) of not more than 100 nm, one of components A) and B) being a thermoplastic and the other component not being processable from the melt, and the entire dispersion having a non-monomodal number distribution of particle diameter, are suitable for saturating, impregnating surfaces, for example of fibers or sheet-like articles made from fibers or porous materials, in particular for coating glass-fiber fabrics as well as for formulating metal-coating systems.Type: GrantFiled: May 24, 2001Date of Patent: May 20, 2003Assignee: Dyneon GmbHInventors: Hermann Blädel, Gernot Löhr, Gerd Grossmann
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Patent number: 6518442Abstract: The invention relates to a method for removing fluorinated emulsifying agent acids from waste waters, characterized in that the finely dispersed solids in the waste water are stabilized with a nonionic or cationic surfactant or an analogous acting surface active substance, the fluorinated emulsifying agent acids are subsequently bonded on an anion exchange resin and the fluorinated emulsifying agent acids are eluted from the latter.Type: GrantFiled: November 16, 2000Date of Patent: February 11, 2003Assignees: Dyneon GmbH & Co., KG, Axiva GmbHInventors: Bernd Felix, Tilman Zipplies, Stephan Führer, Thomas Kaiser, Armin Budesheim
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Patent number: 6451914Abstract: Compositions, consisting essentially of a melt-spinnable polymer component and minor amounts of an emulsion polytetrafluoroethylene micropowder having a melting point sufficiently far above the processing temperature of the polymer component for the micro-powder not to melt during the processing of the polymer component are suitable for producing textile fiber materials.Type: GrantFiled: October 26, 2000Date of Patent: September 17, 2002Assignee: Dyneon GmbH & Co. KGInventors: Friedrich Kloos, Wolfgang Neumann, Peter Griffiths
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Patent number: 6436244Abstract: Fluorinated emulsifier acids bound to an anion exchanger resin can be eluted using a mixture of water, a compound of the formula M—X, in which M is an alkali metal or an alkylammonium ion, and X is hydroxyl, fluoride or chloride, and at least one organic solvent which completely dissolves the other components. For work-up of the eluent, this is advantageously subjected to steam distillation until all volatile constituents have been essentially removed, and the emulsifier acid is liberated from the steam distillation residue using a sufficiently strong acid. This emulsifier acid can advantageously be distilled off and collected as the ammonium salt in aqueous ammonia solution.Type: GrantFiled: June 30, 2000Date of Patent: August 20, 2002Assignee: Dyneon GmbHInventors: Stephan Führer, Gernot Löhr, Werner Schwertfeger
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Publication number: 20020010277Abstract: A low-molecular-weight copolymer of tetrafluoroethylene with units of perfluoro alkyl vinyl ethers having a melt index of ≧30 suitable as a mixing component with a higher-molecular-weight copolymer of the same monomers for producing moldings in injection molding or by extrusion.Type: ApplicationFiled: July 17, 2001Publication date: January 24, 2002Applicant: Dyneon GmbHInventors: Ralph Kaulbach, Friedrich Kloos, Gernot Lohr, Peter Stamprech, Lieselotte Stamprech
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Patent number: 6245923Abstract: The process for the recovery of highly fluorinated carboxylic acids from off-gas streams, in which the off-gas is brought into contact with an alkaline washing solution of density >1.15 g/cm3 so that the salt of the highly fluorinated carboxylic acid settles out as a separate phase, proceeds particularly advantageously when the alkaline washing solution is a potassium carbonate solution.Type: GrantFiled: January 5, 1999Date of Patent: June 12, 2001Assignees: Dyneon GmbH, E. I. DuPont de Nemours & Co.Inventors: Reinhard Albert Sulzbach, Rainer Grasberger, Rik A. Brandenburg
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Patent number: 6149978Abstract: If hydrophobic substrates are coated--if appropriate under pressure--with an aqueous dispersion of a thermoplastic fluoropolymer having a number-average particle size of up to 100 nm and the fluoropolymer is fixed on the substrate thus impregnated by heat treatment, firmly adhering coatings are obtained.Type: GrantFiled: February 22, 1994Date of Patent: November 21, 2000Assignee: Dyneon GmbHInventors: Hermann Bladel, Ludwig Mayer, Manfred Schmid
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Patent number: 6099774Abstract: Non-free flowable, non-dusting molding powders with a bulk density of more than 450 g/l are obtained when a suspension polymer of tetrafluoroethylene with a content of 0.01 to 1% by weight of units of at least one perfluoro(alkyl-vinyl) ether is ground to a particle diameter of 10 to 50 .mu.m and agglomerated in water.Type: GrantFiled: April 2, 1998Date of Patent: August 8, 2000Assignee: Dyneon GmbHInventors: Gernot Lohr, Klaus Hintzer, Reinhard Albert Sulzbach
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Patent number: 6100318Abstract: Free-flowing polytetrafluoroethylene molding powders are obtained if a finely divided non free-flowing powder of an optionally modified polytetrafluoroethylene is agglomerated in an aqueous medium which contains a trialkylamine oxide and the agglomerates are dried.Type: GrantFiled: January 9, 1997Date of Patent: August 8, 2000Assignee: Dyneon GmbHInventor: Tilman Zipplies
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Patent number: 6048940Abstract: Sheet-like structures comprising rubber layers and fluoropolymer layers can be produced by employing, as adhesive layer, a mixture comprising a rubber and a thermoplastic fluoropolymer having a melting point <250.degree. C.Type: GrantFiled: August 25, 1998Date of Patent: April 11, 2000Assignee: Dyneon GmbHInventors: Hermann Bladel, Gerd Grossmann, Michael Dadalas
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Patent number: 5990330Abstract: Highly fluorinated carboxylic acids can be removed from exhaust gas streams by scrubbing with concentrated alkali solutions if these alkali solutions have a density high enough for the salt of the highly fluorinated carboxylic acid to separate out as an independent phase. An apparatus suitable therefor contains a scrubber and a separation vessel which is advantageously equipped with a conveying element, a collection vessel connected via an overflow and a circulation line for the scrubbing liquor.Type: GrantFiled: March 7, 1996Date of Patent: November 23, 1999Assignee: Dyneon GmbHInventors: Reinhard Albert Sulzbach, Wilhelm Kowatsch, Dieter Steidl
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Patent number: 5861464Abstract: Labile end groups in fluorinated thermoplastics, in particular carboxyl and acid fluoride groups, are converted into carboxamide groups when the polymer is treated with an aqueous, ammonia-containing solution. The after-treated products have a pale color, do not cause corrosion during processing and can easily be taken from the molds in transfer molding.Type: GrantFiled: December 20, 1996Date of Patent: January 19, 1999Assignee: Dyneon GmbHInventors: Gerhard Goldmann, Klaus Hintzer, Gernot Lohr, Ludwig Mayer
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Patent number: 5760148Abstract: The polymerization of tetrafluoroethylene in aqueous suspension can be carried out with high conversion if the medium is thoroughly mixed using an axially conveying stirrer element in such a manner that a cone forms at least as far as the vicinity of the stirrer element. In the region of this stirrer element there are expediently arranged baffles which extend only over a part of the filling height of the reactor.Type: GrantFiled: May 31, 1995Date of Patent: June 2, 1998Assignee: Dyneon GmbHInventors: Gerd Muller, Thomas Schottle