Patents Represented by Attorney Marilyn H. Bromels, Esq.

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  • Fast-curing perfluoroelastomer composition
    Patent number: 5877264
    Abstract: A process for preparing perfluoroelastomer compositions which comprise perfluoroelastomers having a plurality of nitrile groups and a plurality of carboxyl-containing groups, carboxylate-containing groups, carboxamide groups, or mixtures thereof is provided. Such compositions cure rapidly in the presence of organotin compounds.
    Type: Grant
    Filed: May 28, 1997
    Date of Patent: March 2, 1999
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Anestis Leonidas Logothetis, Nevio Anthony Marini, III
  • Sulfonated perfluoroelastomer composition having improved processability
    Patent number: 5874523
    Abstract: Curable perfluoroelastomer compositions are prepared in the presence of an initiator system comprising a mixture of a persulfate salt and a reducing agent wherein the amount of reducing agent present is no more than 20 mole percent of the total initiator system. The perfluoroelastomer is isolated and decarboxylated, thereby providing a product having excellent processability.
    Type: Grant
    Filed: November 17, 1997
    Date of Patent: February 23, 1999
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Walter Werner Schmiegel
  • Fast-curing perfluoroelastomer composition
    Patent number: 5789489
    Abstract: Fast curing perfluoroelastomer compositions are provided which comprise a perfluoroelastomer having a plurality of nitrile groups and a plurality of carboxyl-containing groups, carboxylate-containing groups, carboxamide groups, or mixtures thereof; and an organotin curing agent.
    Type: Grant
    Filed: August 8, 1997
    Date of Patent: August 4, 1998
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Michael Cregg Coughlin, Charles David Monaco
  • Polychloroprene composition
    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