Patents Represented by Attorney, Agent or Law Firm Craig H. Evans
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Patent number: 5912084Abstract: A seal layer formed from a thermoplastic polymer blend comprising (a) a non-polar, non-ionomeric polyolefin, and (b) a polar ethylene copolymer having carbon monoxide functionality, and its use to adhere adjacent thermoplastic films together to form a package. Since the bonding strength of the thermoplastic films to one another and to the seal layer is greater than the internal cohesion strength of the seal layer itself, the seal layer provides for an easy open package.Type: GrantFiled: February 5, 1997Date of Patent: June 15, 1999Assignee: E. I. du Pont de Nemours and CompanyInventors: Karlheinz Hausmann, Hans Dieter Flieger, Heiko E. Schenck, David R. Sparrow
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Patent number: 5891500Abstract: Package comprising a polymer blend of ionomer and polybutylene in which at least one seam is made up of the blend being sealed to itself.Type: GrantFiled: October 11, 1996Date of Patent: April 6, 1999Assignee: E. I. du Pont de Nemours and CompanyInventor: Vincent Brodie, III
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Patent number: 5891963Abstract: Disclosed herein are processes for polymerizing ethylene, acyclic olefins, and/or selected cyclic olefins, and optionally selected olefinic esters or carboxylic acids, and other monomers. The polymerizations are catalyzed by selected transition metal compounds, and sometimes other co-catalysts. Since some of the polymerizations exhibit some characteristics of living polymerizations, block copolymers can be readily made. Many of the polymers produced are often novel, particularly in regard to their microsructure, which give some of them unusual properties. Numerous novel catalysts are disclosed, as well as some novel processes for making them. The polymers made are useful as elastomers, molding resins, in adhesives, etc. Also described herein is the synthesis of linear .alpha.-olefins by the oligomerization of ethylene using as a catalyst system a combination a nickel compound having a selected .alpha.-diimine ligand and a selected Lewis or Bronsted acid, or by contacting selected .alpha.Type: GrantFiled: July 10, 1997Date of Patent: April 6, 1999Assignees: E. I. du Pont de Nemours and Company, University of North CarolinaInventors: Maurice S. Brookhart, Lynda Kaye Johnson, Christopher Moore Killian, Samuel David Arthur, Elizabeth Forrester McCord, Stephan James McLain
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Patent number: 5889114Abstract: Grafted thermoplastic elastomer compositions formed by melt blending of a minor proportion of a thermoplastic material having a high softening point with a minor proportion of a glycidyl-containing copolymer, followed by melt blending of the thermoplastic material/glycidyl-containing copolymer blend with a major proportion of an acid-containing ethylene copolymer have a unique combination of unexpectedly good high temperature properties, compression set resistance and/or rebound.Type: GrantFiled: February 23, 1993Date of Patent: March 30, 1999Assignee: E. I. du Pont de Nemours and CompanyInventor: Robert Joseph Statz
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Patent number: 5886224Abstract: Disclosed herein are processes for polymerizing ethylene, acyclic olefins, and/or selected cyclic olefins, and optionally selected olefinic esters or carboxylic acids, and other monomers. The polymerizations are catalyzed by selected transition metal compounds, and sometimes other co-catalysts. Since some of the polymerizations exhibit some characteristics of living polymerizations, block copolymers can be readily made. Many of the polymers produced are often novel, particularly in regard to their microstructure, which gives some of them unusual properties. Numerous novel catalysts are disclosed, as well as some novel processes for making them. The polymers made are useful as elastomers, molding resins, in adhesives, etc. Also described herein is the synthesis of linear .alpha.-olefins by the oligomerization of ethylene using as a catalyst system a combination a nickel compound having a selected .alpha.-diimine ligand and a selected Lewis or Bronsted acid, or by contacting selected .alpha.Type: GrantFiled: July 10, 1997Date of Patent: March 23, 1999Assignees: E. I. du Pont de Nemours and Company, University of North CarolinaInventors: Maurice S. Brookhart, Lynda Kaye Johnson, Samuel David Arthur, Jerald Feldman, Kristina Ann Kreutzer, Alison Margaret Anne Bennett, Edward Bryan Coughlin, Steven Dale Ittel, Anju Parthasarathy, Daniel Joseph Tempel
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Patent number: 5880323Abstract: Disclosed herein are processes for polymerizing ethylene, acyclic olefins, and/or selected cyclic olefins, and optionally selected olefinic esters or carboxylic acids, and other monomers. The polymerizations are catalyzed by selected transition metal compounds, and sometimes other co-catalysts. Since some of the polymerizations exhibit some characteristics of living polymerizations, block copolymers can be readily made. Many of the polymers produced are often novel, particularly in regard to their microstructure, which gives some of them unusual properties. Numerous novel catalysts are disclosed, as well as some novel processes for making them. The polymers made are useful as elastomers, molding resins, in adhesives, etc. Also described herein is the synthesis of linear .alpha.-olefins by the oligomerization of ethylene using as a catalyst system a combination a nickel compound having a selected .alpha.-diimine ligand and a selected Lewis or Bronsted acid, or by contacting selected .alpha.Type: GrantFiled: July 10, 1997Date of Patent: March 9, 1999Assignees: E. I. du Pont de Nemours and Company, University of North CarolinaInventors: Maurice S. Brookhart, III, Lynda Kaye Johnson, Christopher Moore Killian, Lin Wang, Zhen-Yu Yang
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Patent number: 5877257Abstract: A blend of ethylene/vinyl alcohol copolymers with crystalline nylon, and ionomers and optionally amorphous nylon that have a unique balance of properties and to packaging films, laminates, co-extrusions and containers prepared therefrom.Type: GrantFiled: September 5, 1996Date of Patent: March 2, 1999Assignee: E. I. du Pont de Nemours and CompanyInventor: Arthur Irving Fetell
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Patent number: 5866663Abstract: Disclosed herein are processes for polymerizing ethylene, acyclic olefins, and/or selected cyclic olefins, and optionally selected olefinic esters or carboxylic acids, and other monomers. The polymerizations are catalyzed by selected transition metal compounds, and sometimes other co-catalysts. Since some of the polymerizations exhibit some characteristics of living polymerizations, block copolymers can be readily made. Many of the polymers produced are often novel, particularly in regard to their microstructure, which gives some of them unusual properties. Numerous novel catalysts are disclosed, as well as some novel processes for making them. The polymers made are useful as elastomers, molding resins, in adhesives, etc. Also described herein is the synthesis of linear .alpha.-olefins by the oligomerization of ethylene using as a catalyst system a combination a nickel compound having a selected .alpha.-diimine ligand and a selected Lewis or Bronsted acid, or by contacting selected .alpha.Type: GrantFiled: July 10, 1997Date of Patent: February 2, 1999Assignees: E. I. du Pont de Nemours and Company, University of North CarolinaInventors: Maurice S. Brookhart, Lynda Kaye Johnson, Christopher Moore Killian, Samuel David Arthur, Jerald Feldman, Elizabeth Forrester McCord, Stephan James McLain, Kristina Ann Kreutzer, Alison Margaret Anne Bennett, Edward Bryan Coughlin, Steven Dale Ittel, Anju Parthasarathy, Lin Wang, Zhen-Yu Yang
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Patent number: 5866658Abstract: Blends of highly-neutralized ionomers of copolymers of ethylene and high weight percentages of .alpha.,.beta.-ethylenically-unsaturated C.sub.3 -C.sub.8 carboxylic acids dispersed in a continuous or co-continuous polyamide phase are provided and a process for making such blends. The blends are particularly useful in applications such as molded parts where toughness, high gloss, abrasion/scratch (mar) resistance, UV resistance, high temperature properties and stiffness are desired.Type: GrantFiled: August 26, 1996Date of Patent: February 2, 1999Assignee: E. I. du Pont de Nemours and CompanyInventor: Charles John Talkowski
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Patent number: 5859093Abstract: A hot-melt adhesive for use as a shoe last adhesive, particularly one in a form for use in a direct through feed adhesive dispensing system, made from a melt-blend of a copolymer of ethylene and carboxylic acid, a synthetic wax such as a Fischer-Tropsch wax, and an ethylene/unsaturated carboxylic acid wax having a melt index of at least about 5000 dg/min.Type: GrantFiled: December 9, 1997Date of Patent: January 12, 1999Assignee: E. I. du Pont de Nemours and CompanyInventor: Edward McBride
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Patent number: 5852145Abstract: Certain olefins such as ethylene, .alpha.-olefins and cyclopentene can be polymerized by using catalyst system containing a nickel or palladium .alpha.-diimine complex, a metal containing hydrocarbylation compound, and a selected Lewis acid, or a catalyst system containing certain nickel ?II! or palladium ?II! compounds, an .alpha.-diimine, a metal containing hydrocarbylation compound, and optionally a selected Lewis acid. The process advantageously produces polyolefins useful for molding resins, films, elastomers and other uses.Type: GrantFiled: July 21, 1997Date of Patent: December 22, 1998Assignee: E. I. du Pont de Nemours and CompanyInventors: Stephan James McLain, Jerald Feldman
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Patent number: 5827559Abstract: Heat sealable films for packaging food products, particularly in applications where the packaged food product is heated at high temperatures in a hot water bath. The films have a sealant layer containing an acid copolymer. The acid copolymer has a high degree of ethylene crystallinity and therefore an unusually high melting temperature. The sealant layer provides excellent seal strength and excellent adhesion to meat, particularly poultry, even during hot water immersion.Type: GrantFiled: January 29, 1997Date of Patent: October 27, 1998Assignee: E. I. du Pont de Nemours and CompanyInventor: Richard James Powell
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Patent number: 5824412Abstract: Thermoplastic compositions based on polybutylene terephthalate are provided which are useful in high temperature resistant wire coating applications. These compositions generally are four-component alloys with reduced ethylene copolymer (ionomer) content.Type: GrantFiled: March 22, 1996Date of Patent: October 20, 1998Assignee: E. I. du Pont de Nemours and CompanyInventor: Karlheinz Hausmann
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Patent number: 5798413Abstract: Polar thermoplastic polyolefin blends are provided which are flexible and are particularly useful in replacing polyvinyl chloride sheeting used as liners, folders, etc. The blends comprise in general, a non-polar thermoplastic polyolefin, a functionalized polar ethylene copolymer, and a functionalized olefin polymer as a compatibilizer, all of which are chlorine-free.Type: GrantFiled: August 29, 1996Date of Patent: August 25, 1998Assignee: E. I. du Pont de Nemours and CompanyInventors: Heinz H. Spelthann, Karlheinz Hausmann
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Patent number: 5788890Abstract: A process for making injection molded articles particularly ones having swirl patterns of polyamide in an ionomer (marble effect) employing a reciprocating screw injection molding machine is provided. The process involves making a nylon/colorant master batch and using a reciprocating screw injection machine to mold the nylon/colorant master batch and an ionomer under conditions that maintain the nylon/colorant master batch in a state wherein it will flow but will have a viscosity greater than the ionomer so that it will not disperse well in the ionomer at the temperature of injection molding.Type: GrantFiled: April 2, 1997Date of Patent: August 4, 1998Assignee: E. I. du Pont de Nemours and CompanyInventors: Ronald L. Grey, Prosper Zufferey
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Patent number: 5789048Abstract: A consumable package for use in melt-processing operation comprises a container and a melt-processable product such as polymers, elastomers, or additives. The container is formed from a film made from a random ionomer copolymer comprising of ethylene and 20-45 wt % of an unsaturated monocarboxylic acid, the copolymer being neutralized with a metal ion such as lithium, sodium, magnesium, or zinc. The film has a low melting point and a stiffness of greater than 400 megapascals.Type: GrantFiled: October 7, 1996Date of Patent: August 4, 1998Assignee: E. I. du Pont de Nemours and CompanyInventor: Hans Dieter Flieger
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Patent number: 5731069Abstract: A two-component, heat reactive patch particularly useful for sealing gage and drain holes in automobile bodies which comprises an ionomer component and an olefinic/elastomeric component. The ionomer component contains an ionomeric copolymer of ethylene and an .alpha.,.beta.-ethylenically-unsaturated C.sub.3 -C.sub.8 carboxylic acid, a metallic coagent and a filler and, optionally, a non-ionomeric copolymer of ethylene. The olefinic/elastomeric component contains an uncrosslinked elastomer, a multifunctional acrylic monomer, and a free-radical curing agent.Type: GrantFiled: September 29, 1995Date of Patent: March 24, 1998Assignees: E. I. du Pont de Nemours and Company, Sika CorporationInventors: Ralph Delle Donne, Elizabeth Alexander Schowe, John Lynch Hanley, IV, Rohit Kumar Shah
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Patent number: 5721314Abstract: Thermoplastic polymer alloy compositions are provided comprising a blend of polypropylene, ethylene copolymer ionomer resin, ethylene/glycidyl acrylate or methacrylate copolymer, uncrosslinked ethylene propylene rubber, acid or anhydride grafted polypropylene, an agent for crosslinking the rubber and/or catalyzing an epoxide/acid reaction, and optionally a poly-.alpha.-olefin. The compositions are particularly useful for thermoforming of articles having high deep-draw ratios. The presence of the poly-.alpha.-olefin assists to improve embossing and grain retention of embossed sheets, particularly at high deep-draw ratios.Type: GrantFiled: December 11, 1995Date of Patent: February 24, 1998Assignee: E. I. du Pont de Nemours and CompanyInventor: Karlheinz Hausmann
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Patent number: 5714556Abstract: Disclosed herein is a process for the polymerization of ethylene, norbornenes and styrenes, by contacting in solution a selected nickel compound and a selected compound which is or can coordinated to the nickel with the olefin(s). The polymers produced are useful for films and molding resins.Type: GrantFiled: June 27, 1996Date of Patent: February 3, 1998Assignee: E. I. DuPont de Nemours and CompanyInventors: Lynda Kaye Johnson, Jerald Feldman, Kristina Ann Kreutzer, Stephan James McLain, Alison Margaret Anne Bennett, Edward Bryan Coughlin, Dennis Scott Donald, Lissa Taka Jennings Nelson, Anju Parthasarathy, Xing Shen, Wilson Tam, Yueli Wang
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Patent number: 5688993Abstract: An improved method for synthesizing vinyl acetate by the gas phase reaction of acetic acid with ethylene in the presence of oxygen. At least two catalyst modifiers are used, each causing a different level of catalyst activity. The relative mounts of the catalyst modifiers are used to fine tune the productivity of the catalyst.Type: GrantFiled: February 21, 1996Date of Patent: November 18, 1997Assignee: E. I. Du Pont de Nemours and CompanyInventor: William Douglas Provine