Patents by Inventor Howard C. Ng
Howard C. Ng 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: 8598391Abstract: Processes for reducing the color of polytrimethylene ether glycol or copolymers thereof are provided. The processes include polycondensing diols in the presence of an acid catalyst and adding base continuously over a period of the polycondensation reaction. The invention also relates to the polytrimethylene ether glycol thereof produced by these processes.Type: GrantFiled: September 29, 2010Date of Patent: December 3, 2013Assignee: E I du Pont de Nemours and CompanyInventors: Aaron Minter, Edward R. Murphy, Howard C. Ng, Rupert Spence, Tuyu Xie
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Publication number: 20110077433Abstract: Processes for reducing the color of polytrimethylene ether glycol or copolymers thereof are provided. The processes include polycondensing diols in the presence of an acid catalyst and adding base continuously over a period of the polycondensation reaction. The invention also relates to the polytrimethylene ether glycol thereof produced by these processes.Type: ApplicationFiled: September 29, 2010Publication date: March 31, 2011Applicant: E.I. DU PONT DE NEMOURS AND COMPANYInventors: Aaron Minter, Edward R. Murphy, Howard C. Ng, Rupert Spence, Tuyu Xie
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Patent number: 7696264Abstract: Processes for preparing silicon-containing polytrimethylene homo- or copolyethers, wherein at least a portion of the polymer end groups are silicon-containing end groups, are provided.Type: GrantFiled: September 30, 2009Date of Patent: April 13, 2010Assignee: E. I. du Pont de Nemours and CompanyInventor: Howard C. Ng
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Publication number: 20100016622Abstract: Processes for preparing silicon-containing polytrimethylene homo- or copolyethers, wherein at least a portion of the polymer end groups are silicon-containing end groups, are provided.Type: ApplicationFiled: September 30, 2009Publication date: January 21, 2010Applicant: E. I. DU PONT DE NEMOURS AND COMPANYInventor: Howard C. Ng
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Patent number: 7645853Abstract: Processes for preparing random polytrimethylene ether ester are provided. The processes include contacting 1,3-propanediol with a suitable polymerization catalyst, wherein the 1,3-propanediol comprises about 10 microg/g or less peroxide compounds, based on the weight of 1,3-propanediol, and about 100 microg/g or less carbonyl compounds based on the weight of the 1,3-propanediol.Type: GrantFiled: December 4, 2007Date of Patent: January 12, 2010Assignee: E.I. du Pont de Nemours and CompanyInventors: Howard C. Ng, Hari Babu Sunkara
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Patent number: 7629396Abstract: A silicon-containing polytrimethylene homo- or copolyether wherein at least a portion of the polymer end groups are silicon-containing end groups having the formula: —OSi(X)(Y)(Z), where X and Y are groups that are easily displaceable from silicon by reaction with water and/or alcohols, and Z is selected from the group consisting of (a) C1-C20 linear or branched alkyl groups, (b) cycloaliphatic groups, (c) aromatic groups, each of (a), (b) and (c) being optionally substituted with a member selected from the group consisting of O, N, P and S, (d) hydrogen, and (e) groups that are easily displaceable from silicon by water and/or alcohol.Type: GrantFiled: March 27, 2008Date of Patent: December 8, 2009Assignee: E.I. du Pont de Nemours and CompanyInventor: Howard C. Ng
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Publication number: 20080220192Abstract: Multilayer shaped articles, including films, preforms and containers, and method for forming the same, having at least one layer of poly(l, 3-propylene 2,6-naphthalate) and at least one layer of poly(ethylene terephthalate). Poly(1,3-propylene 2,6-naphthalate) can be co-stretched with poly(ethylene terephthalate) to form oriented multilayer structures which have superior barrier properties. The poly(l,3-propylene 2,6-naphthalate) and poly(ethylene terephthalate) layers have good adhesion and do not require an adhesive tie layer.Type: ApplicationFiled: December 3, 2007Publication date: September 11, 2008Inventors: Ross A. Lee, Howard C. Ng, Pallatheri Manackal Subramanian
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Publication number: 20080194726Abstract: A silicon-containing polytrimethylene homo- or copolyether wherein at least a portion of the polymer end groups are silicon-containing end groups having the formula: —OSi(X)(Y)(Z), where X and Y are groups that are easily displaceable from silicon by reaction with water and/or alcohols, and Z is selected from the group consisting of (a) C1-C20 linear or branched alkyl groups, (b) cycloaliphatic groups, (c) aromatic groups, each of (a), (b) and (c) being optionally substituted with a member selected from the group consisting of O, N, P and S, (d) hydrogen, and (e) groups that are easily displaceable from silicon by water and/or alcohol.Type: ApplicationFiled: March 27, 2008Publication date: August 14, 2008Inventor: Howard C. Ng
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Publication number: 20080177024Abstract: Processes for preparing random polytrimethylene ether ester are provided. The processes include contacting 1,3-propanediol with a suitable polymerization catalyst, wherein the 1,3-propanediol comprises about 10 microg/g or less peroxide compounds, based on the weight of 1,3-propanediol, and about 100 microg/g or less carbonyl compounds based on the weight of the 1,3-propanediol.Type: ApplicationFiled: December 4, 2007Publication date: July 24, 2008Inventors: Howard C. Ng, Hari Babu Sunkara
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Patent number: 7388115Abstract: The present invention relates to a process of manufacture of polytrimethylene ether glycol, in which one or more inorganic compounds selected from alkali metal carbonates are utilized during certain purification steps to reduce phase separation time.Type: GrantFiled: November 15, 2006Date of Patent: June 17, 2008Assignee: E. I. du Pont de Nemours and CompanyInventors: Hari Babu Sunkara, Howard C. Ng
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Publication number: 20070173669Abstract: The present invention relates to a process of manufacture of polytrimethylene ether glycol, in which one or more inorganic compounds selected from alkali metal carbonates are utilized during certain purification steps to reduce phase separation time.Type: ApplicationFiled: November 15, 2006Publication date: July 26, 2007Inventors: Hari Babu Sunkara, Howard C. Ng
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Patent number: 7244790Abstract: The present invention relates to a curable thermoplastic elastomeric composition based on a polytrimethylene ether ester elastomer and a crosslinkable poly(meth)acrylate rubber system; and a melt processible thermoplastic elastomeric compositions based on a continuous phase comprising of a polytrimethylene ether ester elastomer and a disperse phase of a crosslinked poly(meth)acrylate rubber. A process for manufacturing such a melt processible thermoplastic elastomeric composition, and a shaped article (e.g. an extruded or molded article) made thereform, are also disclosed.Type: GrantFiled: May 2, 2005Date of Patent: July 17, 2007Assignee: E.I. du Pont de Nemours and CompanyInventors: Hari Babu Sunkara, Herbert Vernon Bendler, Howard C. Ng, Chun Sing Wong
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Patent number: 7164046Abstract: The present invention relates to a process of manufacture of polytrimethylene ether glycol, in which one or more inorganic compounds selected from an inorganic salt and an inorganic base is utilized during certain purification steps to reduce phase separation time.Type: GrantFiled: January 20, 2006Date of Patent: January 16, 2007Assignee: E. I. du Pont de Nemours and CompanyInventors: Hari Babu Sunkara, Howard C. Ng, Wei Zheng, Zhihong Wu
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Patent number: 7161045Abstract: A process of manufacture of polytrimethylene ether glycol comprising: (a) polycondensing reactant comprising diol selected from the group consisting of 1,3-propanediol, 1,3-propanediol dimer and 1,3-propanediol trimer or mixtures thereof in the presence of acid polycondensation catalyst to form polytrimethylene ether glycol; (b) adding water to the polytrimethylene ether glycol and hydrolyzing the acid esters formed during the polycondensation to form a hydrolyzed mixture containing the polytrimethylene ether glycol and the hydrolyzed acid esters; (c) adding organic solvent that is miscible with water to the hydrolyzed mixture to form an aqueous-organic mixture comprising (i) organic phase containing polytrimethylene ether glycol and residual acid polycondensation catalyst from the polycondensing and (ii) water phase; (d) separating the water phase and the organic phase; (e) adding base to the separated organic phase to neutralize the residual acid polycondensation catalyst by forming salts of the residual acType: GrantFiled: August 16, 2005Date of Patent: January 9, 2007Assignee: E. I. du Pont de Nemours and CompanyInventors: Hari Babu Sunkara, Howard C. Ng, Wei Zheng
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Patent number: 7157607Abstract: A process of manufacture of polytrimethylene ether glycol comprising: (a) polycondensing reactant comprising diol selected from the group consisting of 1,3-propanediol, 1,3-propanediol dimer and 1,3-propanediol trimer or mixtures thereof in the presence of acid polycondensation catalyst to form polytrimethylene ether glycol; (b) adding water to the polytrimethylene ether glycol to form an aqueous mixture; (c) heating the aqueous mixture to hydrolyze acid esters formed during the acid catalyzed polycondensation; (d) adding to the hydrolyzed aqueous mixture organic solvent that is miscible with polytrimethylene ether glycol to form (i) organic phase containing the polytrimethylene ether glycol and residual acid polycondensation catalyst from the polycondensing and (ii) aqueous phase; (e) separating the aqueous phase and the organic phase; (f) adding base to the separated organic phase to neutralize the residual acid polycondensation catalyst by forming salts of the residual acid polycondensation catalyst; (gType: GrantFiled: August 16, 2005Date of Patent: January 2, 2007Assignee: E. I. du Pont de Nemours and CompanyInventors: Hari Babu Sunkara, Howard C. Ng, Wei Zheng
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Patent number: 6822054Abstract: A random polytrimethylene ether ester prepared by polycondensation of 1,3-propanediol reactant and about 10 to about 0.1 mole % of aliphatic or aromatic diacid or diester, as well as its manufacture and use thereof.Type: GrantFiled: July 31, 2003Date of Patent: November 23, 2004Assignee: E. I. du Pont de Nemours and CompanyInventor: Howard C. Ng
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Publication number: 20040158004Abstract: A random polytrimethylene ether ester prepared by polycondensation of 1,3-propanediol reactant and about 10 to about 0.1 mole % of aliphatic or aromatic diacid or diester, as well as its manufacture and use thereof.Type: ApplicationFiled: July 31, 2003Publication date: August 12, 2004Inventor: Howard C. Ng
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Patent number: 6608168Abstract: A random polytrimethylene ether ester prepared by polycondensation of 1,3-propanediol reactant and about 10 to about 0.1 mole % of aliphatic or aromatic diacid or diester, as well as its manufacture and use thereof.Type: GrantFiled: August 9, 2002Date of Patent: August 19, 2003Assignee: E. I. du Pont de Nemours and CompanyInventor: Howard C. Ng
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Patent number: 5502155Abstract: A process for the manufacture of a partially aromatic polyamide is disclosed. The process comprises the polymerization stages of, in sequence, feeding to a reactor a slurry of at least one aromatic dicarboxylic acid and at least one aliphatic diamine, then with the incremental addition of water and in the presence of 0.05 to 2% by weight of a monocarboxylic acid, heating the slurry to a temperature of at least 270.degree. C. while maintaining a pressure of at least 1.2 MPa. The preferred dicarboxylic acid is 2,6 naphthalene dicarboxylic acid. The polyamides may be used in the manufacture of products using melt processing techniques.Type: GrantFiled: March 3, 1994Date of Patent: March 26, 1996Assignee: Du Pont Canada Inc.Inventor: Howard C. Ng
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Patent number: 5194514Abstract: A process for increasing the molecular weight of a polymer, comprising subjecting said polymer to electromagnetic radiation in the presence of a paramagnetic metallic catalyst for a sufficient period of time to significantly increase the molecular weight of the polymer, said polymer being either in solution or in a molten state and said radiation having a frequency in the range of about 0.9 to 10 GHz. The preferred paramagnetic catalysts are metallic nickel, iron or cobalt. The preferred polymers are polyamides and polyolefins.Type: GrantFiled: August 10, 1990Date of Patent: March 16, 1993Assignee: Du Pont Canada Inc.Inventors: Jeffrey K. Wan, Mary C. Depwe, Howard C. Ng