Patents Assigned to DuPont Dow Elastomers
  • Patent number: 6359089
    Abstract: Disclosed herein is a novel class of fluorovinyl ether monomers which are useful as cure site monomers in fluoroelastomers, a process for the preparation of these fluorovinyl ether monomers, and fluoroelastomer copolymer compositions that contain copolymerized units of these fluorovinyl ether monomers.
    Type: Grant
    Filed: March 22, 2001
    Date of Patent: March 19, 2002
    Assignee: DuPont Dow Elastomers, L.L.C.
    Inventors: Ming-Hong Hung, Walter Werner Schmiegel
  • Patent number: 6348552
    Abstract: Fluoroelastomers having copolymerized units of vinylidene fluoride major monomer, at least one other fluorinated major monomer, and at least one cure site monomer are prepared in an aqueous suspension polymerization process using an initiator consisting essentially of a solution of an oil soluble peroxide in a water-soluble hydrocarbon solvent.
    Type: Grant
    Filed: March 16, 2001
    Date of Patent: February 19, 2002
    Assignee: DuPont Dow Elastomers L.L.C.
    Inventors: Frantz Duvalsaint, Albert Lloyd Moore
  • Patent number: 6346300
    Abstract: Ethylene copolymer elastomer compositions, acrylate rubber compositions, nitrile rubber compositions, fluoroelastomer compositions, and chlorinated elastomer compositions are provided which are curable by exposure to UV radiation. The compositions are particularly suited for production of elastomeric seals using hot melt equipment and a gasketing in place technique.
    Type: Grant
    Filed: July 15, 1999
    Date of Patent: February 12, 2002
    Assignee: DuPont Dow Elastomers L.L.C.
    Inventor: Christian Ruepping
  • Patent number: 6328316
    Abstract: This invention is directed to a seal for installation into an annular groove of dovetail configuration that has a mouth, two side walls depending from the mouth that extend away from each other and a base wall that is connected to the two side walls thereby forming the dovetail configuration.
    Type: Grant
    Filed: January 11, 2000
    Date of Patent: December 11, 2001
    Assignee: DuPont Dow Elastomers, L.L.C.
    Inventors: Shuzo Fukuhara, John Michael Legare
  • Patent number: 6329469
    Abstract: Copolymers having copolymerized units of vinylidene fluoride, perfluoro(alkyl vinyl) ether, 2-hydropentafluoropropene, and, optionally, tetrafluoroethylene, exhibit excellent low temperature properties and processability when cured with polyhydroxy compounds or amines.
    Type: Grant
    Filed: August 20, 1999
    Date of Patent: December 11, 2001
    Assignee: DuPont Dow Elastomers, L.L.C.
    Inventors: Stephen Bowers, Walter Werner Schmiegel
  • Patent number: 6326436
    Abstract: Fluoroelastomers containing copolymerized units of vinylidene fluoride, perfluoro(alkyl vinyl)ether, 2-hydropentafluoropropene, and, optionally, tetrafluoroethylene, and having an iodine atom present at some polymer chain ends, exhibit excellent low temperature properties and processability when dual cured with both polyhydroxy compounds and organic peroxides.
    Type: Grant
    Filed: December 1, 2000
    Date of Patent: December 4, 2001
    Assignee: DuPont Dow Elastomers, L.L.C.
    Inventor: Stephen Bowers
  • Patent number: 6291576
    Abstract: Curable fluoroelastomer compositions comprising a fluoroelastomer, a curative for the fluoroelastomer, and a molecular sieve additive exhibit a reduced tendency to sponge during the curing process.
    Type: Grant
    Filed: August 20, 1999
    Date of Patent: September 18, 2001
    Assignee: DuPont Dow Elastomers L.L.C.
    Inventor: Walter Werner Schmiegel
  • Patent number: 6281296
    Abstract: Perfluoroelastomer compositions comprising perfluoroelastomers having copolymerized units of tetrafluoroethylene, a perfluoro(vinyl ether), and a nitrile-containing cure site monomer are cured with compounds that are capable of generating ammonia at temperatures of 40° C.-330° C. to produce cured compositions having excellent thermal stability. The ammonia-generating compounds also act as cure accelerators in perfluoroelastomer compositions that incorporate other curing agents.
    Type: Grant
    Filed: August 4, 1999
    Date of Patent: August 28, 2001
    Assignee: DuPont Dow Elastomers L.L.C.
    Inventors: James Daniel MacLachlan, Peter Arnold Morken, Walter Werner Schmiegel, Kohtaro Takahashi
  • Patent number: 6277937
    Abstract: Fluoroelastomers having copolymerized units of vinylidene fluoride major monomer, at least one other fluorinated major monomer, and at least one cure site monomer are prepared in an aqueous suspension polymerization process using an initiator consisting essentially of a solution of an oil soluble peroxide in a water-soluble hydrocarbon solvent.
    Type: Grant
    Filed: February 17, 2000
    Date of Patent: August 21, 2001
    Assignee: DuPont Dow Elastomers, L.L.C.
    Inventors: Frantz Duvalsaint, Albert Lloyd Moore
  • Patent number: 6221971
    Abstract: Elastomeric vinylidene fluoride-containing copolymers are cured by a sequential process. In a first step, gum fluoroelastomer is mixed at a temperature of 150° C.-250° C. in the presence of an organic base and metal oxide or metal hydroxide to generate an unsaturated product. The unsaturated product is mixed with a polyhydroxy compound, polyamine, or organic peroxide and the resultant compounded fluoroelastomer is crosslinked.
    Type: Grant
    Filed: November 18, 1999
    Date of Patent: April 24, 2001
    Assignee: DuPont Dow Elastomers, L.L.C.
    Inventor: David L. Tabb
  • Patent number: 6221970
    Abstract: Curable perfluoroelastomer compositions are disclosed that comprise ammonia and uncured perfluorinated elastomers having copolymerized units of nitrile-containing cure site monomers. Such compositions are curable at low temperatures. In addition, curable perfluoroelastomer compositions are disclosed wherein ammonia functions as a cure rate accelerator in the presence of other curing agents.
    Type: Grant
    Filed: August 6, 1999
    Date of Patent: April 24, 2001
    Assignees: E.I. DuPont de Nemours and Company, DuPont Dow Elastomers, L.L.C.
    Inventors: Peter Arnold Morken, Walter Werner Schmiegel
  • Patent number: 6191208
    Abstract: Curable perfluoroelastomer compositions comprising A) a perfluoroelastomer having copolymerized units of tetrafluoroethylene, a perfluoro(vinyl ether), and a nitrile-containing cure site monomer, B) anhydrous silica, and C) a curing agent exhibit excellent thermal stability and reduced tendency to generate hydrogen fluoride under high temperature conditions.
    Type: Grant
    Filed: May 14, 1999
    Date of Patent: February 20, 2001
    Assignee: Dupont Dow Elastomers L.L.S.
    Inventor: Kohtaro Takahashi
  • Patent number: 6169139
    Abstract: A fluoroelastomer latex is produced that is capable of forming films having excellent water resistance. In a first step, polymerization of fluorinated monomers is carried out in the presence of fluorinated surfactants at a pH of 3-8. The pH of the resultant fluoroelastomer emulsion composition is then adjusted to 5-9 and the emulsion is concentrated to yield a solids-rich latex.
    Type: Grant
    Filed: February 26, 1999
    Date of Patent: January 2, 2001
    Assignee: DuPont Dow Elastomers LLC
    Inventor: Albertus van Cleeff
  • Patent number: 6048939
    Abstract: Processability of non-fluorinated melt-processible polymers is improved by introducing a process aid comprising a fluoroelastomer latex or aqueous fluoropolymer dispersion to the non-fluorinated polymer and extruding the blend.
    Type: Grant
    Filed: January 2, 1998
    Date of Patent: April 11, 2000
    Assignee: Dupont Dow Elastomers, L.L.C.
    Inventor: Donnan Edwin Priester
  • Patent number: 6020440
    Abstract: Elastomeric vinylidene fluoride-containing copolymers are cured by a sequential process. In a first step, gum fluoroelastomer is mixed at a temperature of 150.degree. C.-250.degree. C. in the presence of an organic base and metal oxide or metal hydroxide to generate an unsaturated product. The unsaturated product is mixed with a polyhydroxy compound, polyamine, or organic peroxide and the resultant compounded fluoroelastomer is crosslinked.
    Type: Grant
    Filed: September 29, 1997
    Date of Patent: February 1, 2000
    Assignee: Dupont Dow Elastomers, L.L.C.
    Inventor: David L. Tabb
  • Patent number: 5773544
    Abstract: Crystalline polychloroprene compositions comprise mercaptan-modified or xanthogen disulfide-modified 2-chloro-1,3-butadiene homopolymers having gel contents of 5-80 percent by weight. The polymers are prepared by free radical emulsion polymerization at a temperature of 5.degree.-20.degree. C. to a conversion of 70-95 percent in the presence of 2.5.times.10.sup.-4 -5.5.times.10.sup.-4 moles of mercaptan or xanthogen disulfide modifier per mole of 2-chloro-1,3-butadiene.
    Type: Grant
    Filed: January 10, 1997
    Date of Patent: June 30, 1998
    Assignee: Dupont Dow Elastomers
    Inventors: Lance Alan Christell, Richard Misak Tabibian
  • Patent number: RE36618
    Abstract: Polychloroprene latex adhesive compositions which comprise a) mercaptan-modified or xanthogen disulfide-modified 2-chloro-1,3-butadiene homopolymers having gel contents of 5-.[.70.]..Iadd.78.7 .Iaddend.percent by weight, b) 1 to 75 parts by weight of rosin per 100 parts by weight of a), and c) sufficient water to provide a solids content of 25-65 weight percent based on the weight of component a) exhibit excellent heat resistance and green bond strength.
    Type: Grant
    Filed: November 26, 1997
    Date of Patent: March 14, 2000
    Assignee: DuPont Dow Elastomers, L.L.C.
    Inventors: Lance Alan Christell, Richard Misak Tabibian