Patents by Inventor Jiwen F. Duan
Jiwen F. Duan 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: 7695699Abstract: A metal sulfate alcohol composition as well as a process to produce such composition is disclosed. Also disclosed is a process to produce polyester containing the metal sulfate alcohol composition.Type: GrantFiled: May 21, 2008Date of Patent: April 13, 2010Inventor: Jiwen F. Duan
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Publication number: 20090289133Abstract: A continuous wet grinding process is disclosed for comminuting material in a liquid, comprising one or more continuous wet grinding line. Said continuous wet grinding line comprises (1) two or more sealed wet grinders connected in cascade, (2) no unsealed container connected between said grinders, (3) a positive displacement pump connected before the first sealed wet grinder in said cascade to provide the required pressure by the process flow and to regulate flow rate, (4) one or more non-volume delivery pump connected before one or more of said grinders except the first grinder in said cascade to provide necessary pressure without changing flow rate. The invention also discloses a polyester composition that contains high quality inorganic filler such as carbon black, said inorganic filler is produced in said continuous wet grinding process, which has narrower particle size distribution and less coarse particles, therefore less breaks during fiber spinning.Type: ApplicationFiled: May 23, 2008Publication date: November 26, 2009Inventor: Jiwen F. Duan
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Publication number: 20090292102Abstract: A metal sulfate alcohol composition as well as a process to produce such composition is disclosed. Also disclosed is a process to produce polyester containing the metal sulfate alcohol composition.Type: ApplicationFiled: May 21, 2008Publication date: November 26, 2009Inventor: Jiwen F. Duan
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Patent number: 7049376Abstract: A composition that can be used as a catalyst is disclosed. The composition comprises, or is produced by combining, a titanium compound, a glycol, a phosphorus compound, and optionally water. Also disclosed is a process that can be used for producing a polyester. The process comprises contacting, in the presence of a catalyst composition, a carbonyl compound and an alcohol under a condition suitable for esterification, transesterification, or polymerization. The catalyst composition comprises, or is produced by combining, a titanium compound, a glycol, a phosphorus compound, and optionally water.Type: GrantFiled: April 12, 2005Date of Patent: May 23, 2006Assignee: E. I. du Pont de Nemours and CompanyInventor: Jiwen F Duan
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Patent number: 6998462Abstract: Disclosed is a process that comprises contacting, in the presence of an esterification or transesterification or polycondensation catalyst composition, a toner, and a phosphorus compound, a carbonyl compound and an alcohol under a condition suitable for esterification, transesterification, or polymerization.Type: GrantFiled: June 11, 2003Date of Patent: February 14, 2006Assignee: E.I. du Pont de Nemours and CompanyInventors: Jiwen F. Duan, Donald E. Putzig
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Patent number: 6914107Abstract: A composition that can be used as a catalyst is disclosed. The composition comprises, or is produced by combining, a titanium compound, a glycol, a phosphorus compound, and optionally water. Also disclosed is a process that can be used for producing a polyester. The process comprises contacting, in the presence of a catalyst composition, a carbonyl compound and an alcohol under a condition suitable for esterification, transesterification, or polymerization. The catalyst composition comprises, or is produced by combining, a titanium compound, a glycol, a phosphorus compound, and optionally water.Type: GrantFiled: January 24, 2001Date of Patent: July 5, 2005Assignee: E. I. du Pont de Nemours and CompanyInventor: Jiwen F. Duan
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Publication number: 20040254330Abstract: Disclosed is a process that comprises contacting, in the presence of an esterification or transesterification or polycondensation catalyst composition, a toner, and a phosphorus compound, a carbonyl compound and an alcohol under a condition suitable for esterification, transesterification, or polymerization.Type: ApplicationFiled: June 11, 2003Publication date: December 16, 2004Inventors: Jiwen F. Duan, Donald Edward Putzig
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Publication number: 20040242838Abstract: A sufonic composition comprising a partially esterified and partially ester-exchanged first organic sulfonic acid and a metal salt of a second organic sulfonic acid with a glycol is disclosed. Also disclosed are a sulfopolyester containing the sulfonic composition and a process to produce such sulfopolyester, which has lower melt viscosity and better water solubility compared with a sulfopolyester containing only the commonly used sodium dimethyl 5-sulfoisophthalate.Type: ApplicationFiled: June 2, 2003Publication date: December 2, 2004Inventor: Jiwen F. Duan
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Patent number: 6706842Abstract: A glycol-organosilane composition and a process for producing the composition are disclosed. The composition comprises or is produced by combining (a) a glycol and (b) an organosilane. This composition is preferably substantially soluble in glycol and water. Also disclosed is a polyester composition and a process to produce the composition. The composition comprises repeat units derived from (a) a carbonyl compound or its oligomer, (b) a glycol, (c) a crosslinker, and (d) optionally a comonomer. The crosslinker can be the glycol-organosilane, a carbonyl compound containing 3 or more carboxyl groups, or an alcohol containing 3 or more hydroxyl groups. The comonomer is a dicarboxylic compound, a diol compound, or a carbonyl alcohol. The polyester composition can be used to increase the rate of polymerization, to increase pilling resistance and strength of polyester, to decrease crystallization rate and improve object forming process such as fibers and containers.Type: GrantFiled: February 6, 2003Date of Patent: March 16, 2004Inventor: Jiwen F. Duan
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Patent number: 6706852Abstract: A process for producing a partially ester-exchanged SIPM such as an alkali metal bis(2-hydroxyethyl) 5-sulfoisophthalate produced from an alkali metal dimethyl 5-sulfoisophthalate in an alcohol is disclosed. The partially ester-exchanged SIPM in an alcohol can be used to copolymerize with oligomer of terephthalic acid or dimethyl terephthalate and an alcohol. Also disclosed is a process for controlling the color of a dyeable polyester using a phosphorous compound.Type: GrantFiled: July 2, 2002Date of Patent: March 16, 2004Assignee: E. I. du Pont de Nemours and CompanyInventors: Jiwen F. Duan, Xianyin Ma
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Publication number: 20040006194Abstract: A process for producing a partially ester-exchanged SIPM such as an alkali metal bis(2-hydroxyethyl) 5-sulfoisophthalate produced from an alkali metal dimethyl 5-sulfoisophthalate in an alcohol is disclosed. The partially ester-exchanged SIPM in an alcohol can be used to copolymerize with oligomer of terephthalic acid or dimethyl terephthalate and an alcohol. Also disclosed is a process for controlling the color of a dyeable polyester using a phosphorous compound.Type: ApplicationFiled: July 2, 2002Publication date: January 8, 2004Inventors: Jiwen F. Duan, Xianyin Ma
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Patent number: 6541598Abstract: A composition that can be used as catalyst is disclosed. The composition comprises, or is produced by combining, (A) a titanium compound; (B) either (i) a complexing agent, (ii) a combination of a complexing agent, hypophosphorous acid or a salt thereof, and optionally a solvent, a zirconium compound, or both, (iii) combinations thereof; (C) a phosphorus compound; and optionally a solvent. Also disclosed is a process that can be used for producing a polyester. The process comprises contacting, in the presence of an esterification or transesterification or polycondensation catalyst composition and a phosphorus compound, a carbonyl compound and an alcohol under a condition suitable for esterification, transesterification, or polymerization. Further disclosed is a process to make polyester with reduced insoluble particles or solids using a phosphorus compound other than the commonly used phosphoric acid.Type: GrantFiled: July 16, 2002Date of Patent: April 1, 2003Assignee: E. I. du Pont de Nemours and CompanyInventors: Jiwen F. Duan, Donald E. Putzig, Frederick K. Mallon, Timothy M. Davis
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Publication number: 20030045672Abstract: A composition that can be used as catalyst is disclosed. The composition comprises, or is produced by combining, (A) a titanium compound; (B) either (i) a complexing agent, (ii) a combination of a complexing agent, hypophosphorous acid or a salt thereof, and optionally a solvent, a zirconium compound, or both, (iii) combinations thereof; (C) a phosphorus compound; and optionally a solvent. Also disclosed is a process that can be used for producing a polyester. The process comprises contacting, in the presence of an esterification or transesterification or polycondensation catalyst composition and a phosphorus compound, a carbonyl compound and an alcohol under a condition suitable for esterification, transesterification, or polymerization. Further disclosed is a process to make polyester with reduced insoluble particles or solids using a phosphorus compound other than the commonly used phosphoric acid.Type: ApplicationFiled: July 16, 2002Publication date: March 6, 2003Inventors: Jiwen F. Duan, Donald E. Putzig, Frederick K. Mallon, Timothy M. Davis
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Patent number: 6506853Abstract: A substantially soluble solution of isophthalic acid in a glycol can be prepared and contacted with terephthalic acid, its ester, its oligomer, or combinations of two or more thereof. The solution can be used to incorporate isophthalic acid into polyester for bottle resins and fiber.Type: GrantFiled: February 28, 2001Date of Patent: January 14, 2003Assignee: E. I. du Pont de Nemours and CompanyInventor: Jiwen F Duan
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Patent number: 6489433Abstract: A composition that can be used as catalyst is disclosed. The composition comprises, or is produced by combining, (A) a titanium compound; (B) either (i) a complexing agent, (ii) a combination of a complexing agent, hypophosphorous acid or a salt thereof, and optionally a solvent, a zirconium compound, or both, (iii) combinations thereof; (C) a phosphorus compound; and optionally a solvent. Also disclosed is a process that can be used for producing a polyester. The process comprises contacting, in the presence of an esterification or transesterification or polycondensation catalyst composition and a phosphorus compound, a carbonyl compound and an alcohol under a condition suitable for esterification, transesterification, or polymerization. Further disclosed is a process to make polyester with reduced insoluble particles or solids using a phosphorus compound other than the commonly used phosphoric acid.Type: GrantFiled: February 23, 2001Date of Patent: December 3, 2002Assignee: E. I. du Pont de Nemours and CompanyInventors: Jiwen F. Duan, Donald E. Putzig, Frederick K. Mallon, Timothy M. Davis
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Publication number: 20020169273Abstract: A process for producing a partially esterified SIPA such as an alkali metal sulfoisophthalic acid in a glycol is disclosed. The partially esterified SIPA in a glycol can be used to copolymerize with oligomer of terephthalic acid dimethyl terephthalate and a glycol. Also disclosed is a process for controlling the color of a dyeable polyester using a phosphorous compound. Further disclosed is a process for producing a dyeable polyester using a nickel or nickel alloy as surface metal or fluoropolymer surface in processing equipment.Type: ApplicationFiled: March 15, 2001Publication date: November 14, 2002Inventor: Jiwen F. Duan
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Patent number: 6479619Abstract: A process for producing a partially esterified SIPA such as an alkali metal sulfoisophthalic acid in a glycol is disclosed. The partially esterified SIPA in a glycol can be used to copolymerize with oligomer of terephthalic acid dimethyl terephthalate and a glycol. Also disclosed is a process for controlling the color of a dyeable polyester using a phosphorous compound. Further disclosed is a process for producing a dyeable polyester using a nickel or nickel alloy as surface metal or fluoropolymer surface in processing equipment.Type: GrantFiled: March 15, 2001Date of Patent: November 12, 2002Assignee: E. I. du Pont de Nemours and CompanyInventor: Jiwen F. Duan
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Publication number: 20020165336Abstract: A composition that can be used as catalyst is disclosed. The composition comprises, or is produced by combining, (A) a titanium compound; (B) either (i) a complexing agent, (ii) a combination of a complexing agent, hypophosphorous acid or a salt thereof, and optionally a solvent, a zirconium compound, or both, (iii) combinations thereof; (C) a phosphorus compound; and optionally a solvent. Also disclosed is a process that can be used for producing a polyester. The process comprises contacting, in the presence of an esterification or transesterification or polycondensation catalyst composition and a phosphorus compound, a carbonyl compound and an alcohol under a condition suitable for esterification, transesterification, or polymerization. Further disclosed is a process to make polyester with reduced insoluble particles or solids using a phosphorus compound other than the commonly used phosphoric acid.Type: ApplicationFiled: February 23, 2001Publication date: November 7, 2002Inventors: Jiwen F. Duan, Donald E. Putzig, Frederick K. Mallon, Timothy M. Davis
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Publication number: 20020120094Abstract: A substantially soluble solution of isophthalic acid in a glycol can be prepared and contacted with terephthalic acid, its ester, its oligomer, or combinations of two or more thereof. The solution can be used to incorporate isophthalic acid into polyester for bottle resins and fiber.Type: ApplicationFiled: February 28, 2001Publication date: August 29, 2002Inventor: Jiwen F. Duan
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Patent number: 6437088Abstract: A process for producing a polyester. The process comprises polymerizing a polymerization mixture comprising (i) a carbonyl compound or an oligomer of a carbonyl compound and (ii) a glycol, in the presence of a titanium catalyst composition, to produce the polyester, wherein a coated titanium dioxide comprising a titanium dioxide and a coat is added before or during the polymerizing.Type: GrantFiled: August 14, 2001Date of Patent: August 20, 2002Assignee: E. I. du Pont de Nemours and CompanyInventor: Jiwen F. Duan