Patents by Inventor David D. Zhang
David D. Zhang has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 10696771Abstract: Provided is a method for preparing a latex composition, comprising providing an ethylene copolymer comprising copolymerized units of ethylene and copolymerized units of at least one polar comonomer; dissolving the ethylene copolymer with one or more latex monomers to prepare a solution; mixing the solution with water; optionally adding a surfactant or protectant colloid to form an aqueous emulsion; and polymerizing the latex monomer in the emulsion to form a latex composition comprising the ethylene copolymer and a latex polymer. Further provided are the emulsion polymerization product and the mini-emulsion polymerization product of at least one ethylene copolymer substantially dissolved in at least one latex monomer, such as an acrylic, styrene or vinyl monomer. Finally, formulated products comprising or produced from the emulsion or mini-emulsion polymerization product and articles comprising or produced from the formulated products are provided.Type: GrantFiled: March 28, 2016Date of Patent: June 30, 2020Assignee: Performance Materials NA, Inc.Inventors: David D Zhang, David M Dean, Elizabeth R Griffin, Richard Allen Hayes, Donna Lynn Visioli
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Patent number: 9688848Abstract: Disclosed is a laminar shaped article comprising a heterogeneous blend of (a) a composition comprising a vinyl halide or vinylidene halide polymer and optionally an ethylene copolymer containing carboxyl and/or carbon monoxide moieties, and (b) a polyolefin functionalized with a comonomer selected from the group consisting of maleic anhydride, maleic acid diesters, maleic acid monoesters, itaconic anhydride, itaconic acid diesters, itaconic acid monoesters, fumaric acid diesters, fumaric acid monoesters, or combinations thereof as a compatibilizer; and (c) a polyamide wherein the polyamide is present in the vinyl halide or vinylidene halide polymer as a multitude of overlapping layers.Type: GrantFiled: July 30, 2013Date of Patent: June 27, 2017Assignee: E. I. DU PONT DE NEMOURS AND COMPANYInventors: David D Zhang, Elizabeth R Griffin
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Publication number: 20160280905Abstract: Provided is a method for preparing a latex composition, comprising providing an ethylene copolymer comprising copolymerized units of ethylene and copolymerized units of at least one polar comonomer; dissolving the ethylene copolymer with one or more latex monomers to prepare a solution; mixing the solution with water; optionally adding a surfactant or protectant colloid to form an aqueous emulsion; and polymerizing the latex monomer in the emulsion to form a latex composition comprising the ethylene copolymer and a latex polymer. Further provided are the emulsion polymerization product and the mini-emulsion polymerization product of at least one ethylene copolymer substantially dissolved in at least one latex monomer, such as an acrylic, styrene or vinyl monomer. Finally, formulated products comprising or produced from the emulsion or mini-emulsion polymerization product and articles comprising or produced from the formulated products are provided.Type: ApplicationFiled: March 28, 2016Publication date: September 29, 2016Inventors: DAVID D. ZHANG, DAVID M. DEAN, ELIZABETH R. GRIFFIN, RICHARD ALLEN HAYES, DONNA LYNN VISIOLI
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Patent number: 9206316Abstract: Disclosed is a thermoplastic elastomer composition comprising (i) about 10-60 wt % of at least one aliphatic polyamide; (ii) about 0.8-15 wt % of at least one graft-modified ethylene-olefin elastomeric copolymer; (iii) about 0.8-15 wt % of at least one graft-modified ethylene-propylene elastomeric copolymer, and (iv) about 35-85 wt % of at least one polyether-ester-amide block copolymer having a shore D of about 50-60 (as measured in accordance with ASTM D2240), with the total wt % of all components in the composition totaling to 100 wt %. Further disclosed herein is an article made from the thermoplastic elastomer composition disclosed above.Type: GrantFiled: December 21, 2012Date of Patent: December 8, 2015Assignee: E I DU PONT DE NEMOURS AND COMPANYInventors: David D Zhang, Zhongyu Wang
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Patent number: 8722761Abstract: The disclosure provides a melt processible theromoplastic composition, comprising a major proportion of a base polymer comprising a first melt processible thermoplastic polymer having a first Fedor's solubility parameter and a first viscosity; and a combination of a carrier polymer and a surface modifying additive, the carrier polymer comprising a second melt processible thermoplastic polymer which has a second Fedor's solubility parameter that is at least about 2.5 (J/cm3)1/2 lower than the first Fedor's solubility parameter, and a second viscosity, the carrier polymer being adhered to the surface modifying additive, and wherein the first viscosity is at least about 10 times the second viscosity.Type: GrantFiled: October 29, 2009Date of Patent: May 13, 2014Assignee: E I du Pont de Nemours and CompanyInventors: Narayanan Sankara Subramanian, David D. Zhang
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Patent number: 8512838Abstract: Disclosed is a laminar shaped article comprising a heterogeneous blend of (a) a composition comprising a vinyl halide or vinylidene halide polymer and optionally an ethylene copolymer containing carboxyl and/or carbon monoxide moieties, and (b) a polyolefin functionalized with a comonomer selected from the group consisting of maleic anhydride, maleic acid diesters, maleic acid monoesters, itaconic anhydride, itaconic acid diesters, itaconic acid monoesters, fumaric acid diesters, fumaric acid monoesters, or combinations thereof as a compatibilizer; and (c) a polyamide wherein the polyamide is present in the vinyl halide or vinylidene halide polymer as a multitude of overlapping layers.Type: GrantFiled: November 23, 2009Date of Patent: August 20, 2013Assignee: E I du Pont de Nemours and CompanyInventors: David D. Zhang, Elizabeth R. Griffin
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Patent number: 8048957Abstract: Disclosed is a composition comprising a blend and a modifier in which the blend comprises polycarbonate and acrylonitrile/butadiene/styrene terpolymer and 15 weight % or less of a modifier wherein the modifier comprises an ethylene ester copolymer and either an acrylonitrile butadiene styrene block copolymer or a core-shell polymer. Also disclosed are shaped articles prepared from the composition.Type: GrantFiled: May 20, 2009Date of Patent: November 1, 2011Assignee: E.I. du Pont de Nemours and CompanyInventor: David D. Zhang
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Patent number: 7834089Abstract: Disclosed are compositions of ethylene acid copolymers and EVOH that are useful for fabricating films, sheets and other shaped articles such as tubing, bottle, fuel tank, tray etc. comprising (1) an ethylene vinyl alcohol copolymer; and (2) a copolymer comprising in-chain copolymerized units of (a) in-chain copolymerized units of ethylene; (b) in-chain polymerized units of an ?,?-unsaturated C3-C8 carboxylic acid; (c) in-chain polymerized units of at least one comonomer that is an ethylenically unsaturated dicarboxylic acid or derivative thereof; and optionally (d) in-chain copolymerized units of alkyl acrylate or alkyl methacrylate, and wherein the carboxylic acid functionalities present are at least partially neutralized by one or more alkali metal, transition metal, or alkaline earth metal cations. The compositions can be used for packaging of foodstuffs, medical solutions and industrial chemicals.Type: GrantFiled: May 8, 2007Date of Patent: November 16, 2010Assignee: E. I. du Pont de Nemours and CompanyInventor: David D. Zhang
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Publication number: 20100129576Abstract: Disclosed is a laminar shaped article comprising a heterogeneous blend of (a) a composition comprising a vinyl halide or vinylidene halide polymer and optionally an ethylene copolymer containing carboxyl and/or carbon monoxide moieties, and (b) a polyolefin functionalized with a comonomer selected from the group consisting of maleic anhydride, maleic acid diesters, maleic acid monoesters, itaconic anhydride, itaconic acid diesters, itaconic acid monoesters, fumaric acid diesters, fumaric acid monoesters, or combinations thereof as a compatibilizer; and (c) a polyamide wherein the polyamide is present in the vinyl halide or vinylidene halide polymer as a multitude of overlapping layers.Type: ApplicationFiled: November 23, 2009Publication date: May 27, 2010Applicant: E. I. DU PONT DE NEMOURS AND COMPANYInventors: David D. ZHANG, Elizabeth R. GRIFFIN
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Publication number: 20100113644Abstract: The disclosure provides a melt processible theromoplastic composition, comprising a major proportion of a base polymer comprising a first melt processible thermoplastic polymer having a first Fedor's solubility parameter and a first viscosity; and a combination of a carrier polymer and a surface modifying additive, the carrier polymer comprising a second melt processible thermoplastic polymer which has a second Fedor's solubility parameter that is at least about 2.5 (J/cm3)1/2 lower than the first Fedor's solubility parameter, and a second viscosity, the carrier polymer being adhered to the surface modifying additive, and wherein the first viscosity is at least about 10 times the second viscosity.Type: ApplicationFiled: October 29, 2009Publication date: May 6, 2010Applicant: E.I. DU PONT DE NEMOURS AND COMPANYInventors: NARAYANAN SANKARA SUBRAMANIAN, David D. Zhang
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Publication number: 20090292083Abstract: A polycarbonate and acrylonitrile/butadiene/styrene terpolymer blend comprises 15 weight % or less of a modifier combination, wherein the modifier combination comprises an ethylene ester copolymer and an acrylonitrile butadiene styrene block copolymer, and optionally at least one additional comonomer selected from the group consisting of alky acrylates and alkyl methacrylates; or a core-shell polymer. Also disclosed are shaped articles prepared from the composition.Type: ApplicationFiled: May 20, 2009Publication date: November 26, 2009Applicant: E. I. DU PONT DE NEMOURS AND COMPANYInventor: David D. Zhang
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Publication number: 20080281045Abstract: Disclosed are compositions of ethylene acid copolymers and EVOH that are useful for fabricating films, sheets and other shaped articles such as tubing, bottle, fuel tank, tray etc. comprising (1) an ethylene vinyl alcohol copolymer; and (2) a copolymer comprising in-chain copolymerized units of (a) in-chain copolymerized units of ethylene; (b) in-chain polymerized units of an ?,?-unsaturated C3-C8 carboxylic acid; (c) in-chain polymerized units of at least one comonomer that is an ethylenically unsaturated dicarboxylic acid or derivative thereof; and optionally (d) in-chain copolymerized units of alkyl acrylate or alkyl methacrylate, and wherein the carboxylic acid functionalities present are at least partially neutralized by one or more alkali metal, transition metal, or alkaline earth metal cations. The compositions can be used for packaging of foodstuffs, medical solutions and industrial chemicals.Type: ApplicationFiled: May 8, 2007Publication date: November 13, 2008Inventor: David D. Zhang
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Patent number: 5574108Abstract: The present invention is directed to extrudable sealants which are particularly well suited for bonding a metal based, lidding material to a polystyrene container. The most preferred sealant compositions of the present invention preferably contain an acid copolymer, a tackifier and a polyolefin.Type: GrantFiled: April 18, 1995Date of Patent: November 12, 1996Assignee: E. I. Du Pont de Nemours and CompanyInventors: Vladimir Antonov, David D. Zhang, Stephen R. Tanny, Alister M. Soutar
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Patent number: 5516583Abstract: The inventive adhesive composition provides a whitening effect upon peeling. The composition comprises (A) ethylene vinyl acetate polymer, ethylene acrylate polymer or mixtures thereof; (B) a styrene polymer, and optionally (C) a polyolefin.Type: GrantFiled: August 29, 1994Date of Patent: May 14, 1996Assignee: E. I. Du Pont de Nemours and CompanyInventors: David D. Zhang, I-Hwa Lee