Patents Represented by Attorney Marilyn H. Bromels
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Patent number: 7872163Abstract: 3,4-Dichlorobutene-1 is produced by a process comprising the step of contacting 1,4-dichlorobutene-2 with either 1) a ferric carboxylate catalyst of the formula where R is an alkyl or alkenyl group of 4-18 carbon atoms, a cycloalkyl or cycloalkenyl group of 6-18 carbon atoms or an aryl group selected from phenyl, benzyl, xylyl, tolyl, and naphthyl groups, whereby a portion of the 1,4-dichlorobutene-2 is isomerized to form 3,4-dichlorobutene-1, or 2) a ferric carboxylate catalyst of the formula where R, R? and R? are independently alkyl or alkenyl groups of 4-18 carbon atoms, cycloalkyl or cycloalkenyl groups of 6-18 carbon atoms or aryl groups selected from phenyl, benzyl, xylyl, tolyl, and naphthyl groups, the sum of m, n and o is 3 and m, n and o are independently 0, 1 or 2, whereby a portion of the 1,4-dichlorobutene-2 is isomerized to form 3,4-dichlorobutene-1.Type: GrantFiled: December 16, 2009Date of Patent: January 18, 2011Assignee: DuPont Performance Elastomers L.L.C.Inventor: Jay Reimers
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Patent number: 5973091Abstract: Perfluoroelastomer compositions of improved processability are provided which have reduced levels of ionized or ionizable polymer endgroups.Type: GrantFiled: September 11, 1998Date of Patent: October 26, 1999Assignee: E. I. du Pont de Nemours and CompanyInventor: Walter Werner Schmiegel
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Patent number: 5936060Abstract: Perfluoroelastomer compositions of improved processability are provided which have reduced levels of ionized or ionizable polymer endgroups.Type: GrantFiled: November 17, 1997Date of Patent: August 10, 1999Assignee: E. I. du Pont de Nemours and CompanyInventor: Walter Werner Schmiegel
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Patent number: 5877264Abstract: 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: GrantFiled: May 28, 1997Date of Patent: March 2, 1999Assignee: E. I. du Pont de Nemours and CompanyInventors: Anestis Leonidas Logothetis, Nevio Anthony Marini, III
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Patent number: 5874523Abstract: 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: GrantFiled: November 17, 1997Date of Patent: February 23, 1999Assignee: E. I. du Pont de Nemours and CompanyInventor: Walter Werner Schmiegel
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Patent number: 5824755Abstract: Fluoroelastomers having copolymerized units of vinylidene fluoride and at least one other fluorinated monomer are prepared in aqueous suspension using an initiator comprising a solution of an oil soluble peroxide in a water-soluble hydrocarbon solvent.Type: GrantFiled: February 21, 1997Date of Patent: October 20, 1998Assignee: E. I. du Pont de Nemours and CompanyInventors: Kenichi Hayashi, Kenzo Hashimura, Michio Kasahara, Yukihiro Ikeda
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Patent number: 5789489Abstract: 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: GrantFiled: August 8, 1997Date of Patent: August 4, 1998Assignee: E. I. du Pont de Nemours and CompanyInventors: Michael Cregg Coughlin, Charles David Monaco
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Patent number: 5773544Abstract: 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: GrantFiled: January 10, 1997Date of Patent: June 30, 1998Assignee: Dupont Dow ElastomersInventors: Lance Alan Christell, Richard Misak Tabibian
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Patent number: 5719259Abstract: Perfluoroalkylene oxide copolymer having acid fluoride moieties are prepared by reaction of hexafluoropropylene oxide and 1,2-epoxypentafluoropropane 3-fluorosulfate in the presence of a cesium alkoxide initiator. The copolymers may be cured at room temperature and are useful in sealant and coating formulations. Derivatives of the copolymers containing ester, amide, nitrile, and ether moieties are also disclosed.Type: GrantFiled: August 12, 1996Date of Patent: February 17, 1998Assignee: E. I. du Pont de Nemours and CompanyInventors: Galina Mikhailovna Tyul'ga, Olga Borisovna Platonova, Irina Gennadievna Solodkaya, Dimetrii Stefanovich Rondarev, Yurii Kalmanovich Starobin, Sergey Vasilievich Sokolov, Albertus VanCleeff
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Patent number: 5527571Abstract: Curable multilayer coated plastic substrates are provided having enhanced gasoline resistance and topcoat adhesion. The plastic is coated with a primer layer which is either a chlorosulfonated grafted polypropylene polymer or a mixture of a chlorinated grafted propylene polymer and a chlorosulfonated olefin polymer and which is free of crosslinking agents for the chlorosulfonated polymer. The primer layer is coated with a coating layer having free hydroxyl, primary amino, or secondary amino groups capable of reacting with the chlorosulfonyl groups of the primer layer.Type: GrantFiled: May 22, 1995Date of Patent: June 18, 1996Assignee: E. I. Du Pont de Nemours and CompanyInventor: Edward G. Brugel
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Patent number: 5527846Abstract: 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 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: GrantFiled: March 27, 1995Date of Patent: June 18, 1996Assignee: E. I. Du Pont de Nemours and CompanyInventors: Lance A. Christell, Richard M. Tabibian
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Patent number: 5508355Abstract: Disclosed is a vulcanizable, fluorine-containing elastomer composition comprising (a) a vulcanizable, fluorine-containing elastomer, (b) a polyol vulcanizing agent comprising a polyol compound as a crosslinking agent, and (c) an aliphatic amine compound represented by the formula: R.sub..alpha. NH.sub..beta. wherein R represents an alkyl group, .alpha. represents an integer of from 1 to 3, and .beta. represents 3 minus .alpha..Type: GrantFiled: September 30, 1994Date of Patent: April 16, 1996Assignee: E. I. Du Pont de Nemours and CompanyInventors: Keiichi Toda, Shinichi Shibayama, Hiroshi Saitou
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Patent number: 5498669Abstract: A curable ethylene copolymer blend composition is provided which is a blend of an ethylene dipolymer, an ionomer of an ethylene unsaturated acid copolymer, and a peroxide curing agent. The composition is particularly adapted for production of non-porous products under pressureless curing conditions.Type: GrantFiled: June 6, 1995Date of Patent: March 12, 1996Assignee: E. I. Du Pont de Nemours and CompanyInventor: Clive I. Williams
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Patent number: 5492971Abstract: A curable ethylene copolymer blend composition is provided which is a blend of an ethylene dipolymer, an ionomer of an ethylene unsaturated acid copolymer, and a peroxide curing agent. The composition is particularly adapted for production of non-porous products under pressureless curing conditions.Type: GrantFiled: May 19, 1994Date of Patent: February 20, 1996Assignee: E. I. Du Pont de Nemours and CompanyInventor: Clive I. Williams
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Patent number: 5491191Abstract: Self-stabilized resin latexes are provided which contain sulfonate salts produced by basic hydrolysis of chlorosulfonated C.sub.2 -C.sub.8 alpha-olefin polymers having chlorine contents of 20-70 weight percent and sulfur contents of 1.5-10 weight percent. Further provided is a novel composition comprising a chlorosulfonated graft-modified ethylene/propylene copolymer.Type: GrantFiled: April 7, 1992Date of Patent: February 13, 1996Assignee: E. I. Du Pont de Nemours and CompanyInventor: John C. Chen
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Patent number: 5483006Abstract: Chloroprene/sulfur copolymers peptized either by xanthogen sulfides alone or in combination with mercaptobenzothiazole in an alkaline dispersion are cured in the presence of N-cyclohexyl-2-benzothiazyl-sulfenamide or mercaptobenzothiazole disulfide as an accelerator and in the absence of nitrosamine forming additives. Metal oxides are the usual curing agents.Type: GrantFiled: August 18, 1994Date of Patent: January 9, 1996Assignee: E. I. Du Pont de Nemours and CompanyInventor: Christian Ruepping
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Patent number: 5436079Abstract: Curable multilayer coated plastic substrates are provided having enhanced gasoline resistance and topcoat adhesion. The plastic is coated with a primer layer which is either a chlorosulfonated grafted polypropylene polymer or a mixture of a chlorinated grafted propylene polymer and a chlorosulfonated olefin polymer and which is free of crosslinking agents for the chlorosulfonated polymer. The primer layer is coated with a coating layer having free hydroxyl, primary amino, or secondary amino groups capable of reacting with the chlorosulfonyl groups of the primer layer.Type: GrantFiled: May 6, 1994Date of Patent: July 25, 1995Assignee: E. I. Du Pont de Nemours and CompanyInventor: Edward G. Brugel
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Patent number: 5412034Abstract: Curable elastomeric blends of fluoroelastomer and hydrocarbon elastomer in which at least one of the fluoroelastomer and hydrocarbon elastomer contains a cure site monomer.Type: GrantFiled: October 26, 1993Date of Patent: May 2, 1995Assignee: E. I. Du Pont de Nemours and CompanyInventor: David L. Tabb
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Patent number: 5407993Abstract: Blends of chloroprene homopolymers or copolymers with chloroprene/acrylate or chloroprene/methacrylate graft copolymers provide compositions especially useful as components of latex adhesive formulations.Type: GrantFiled: December 8, 1993Date of Patent: April 18, 1995Assignee: E. I. Du Pont de Nemours and CompanyInventors: Donald F. Lyons, Jack L. Nyce, deceased, by Stephen C. Poole, executor
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Patent number: 5408000Abstract: A flexible, thermoplastic, blow moldable composition which comprises a substantially homogeneous blend of A) about 40-60 wt. % polyamide, B) about 20-58 wt. % of a first ethylene copolymer selected from the group consisting of copolymers of ethylene and at least one alpha, beta ethylenically-unsaturated carboxylic acid having 3-8 carbon atoms, and ionomers of said ethylene copolymers, C) about 1-20 wt. % of a second ethylene copolymer having interpolymerized units of ethylene and 1-10 wt. % of an alpha, beta ethylenically-unsaturated aliphatic epoxide, and D) 0.1-0.6 wt. % fibrillatable polytetrafluoroethylene or fibrillatable modified polytetrafluoroethylene.Type: GrantFiled: July 19, 1993Date of Patent: April 18, 1995Assignee: E. I. Du Pont de Nemours and CompanyInventors: James D. Katsaros, Pallatheri M. Subramanian, Donald R. Swain