Patents Assigned to DuPont Dow Elastomer L.L.C.
  • Process for producing fluorelastomers
    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
  • Curable perfluoroelastomer composition
    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
  • Process for curing elastomeric vinylidene fluoride copolymers
    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
  • Process aid for melt processible polymers
    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
  • Process for curing elastomeric vinylidene fluoride copolymers
    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
  • Polychloroprene adhesive latex composition
    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