Patents by Inventor Donald Ross Kelsey
Donald Ross Kelsey 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: 7732211Abstract: The present invention relates to a method for screening of polycondensation catalysts, wherein at least two polycondensation catalysis reactions are performed simultaneously under substantially equivalent conditions in at least two reaction cells which are present in one and the same room, using a sample comprising material to be polycondensated and a catalyst to be screened, and wherein the performances of the catalysts are analyzed. The present invention further relates to an apparatus suitable for performing the method.Type: GrantFiled: October 12, 2001Date of Patent: June 8, 2010Assignee: Avantium International B.V.Inventors: Donald Ross Kelsey, Kathleen Suzanne Kiibler
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Publication number: 20080194793Abstract: The present invention provides a process of reducing acrolein byproduct from polytrimethylene terephthalate using selected phosphorous compounds to contact the polytrimethylene terephthalate or reactants in the process of producing polytrimethylene terephthalate. The selected phosphorous compounds are retained in the polytrimethylene terephthalate. The present invention also provides polytrimethylene terephthalate compositions containing amounts of phosphorous compounds.Type: ApplicationFiled: April 11, 2008Publication date: August 14, 2008Inventors: Donald Ross KELSEY, Cecilia Zuqi Tse, Robert Lawrence Blackbourn, Holger Georg Bachmann, Eckhard Seidel
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Patent number: 7381787Abstract: The present invention provides a process of reducing acrolein by product from polytrimethylene terephthalate using selected phosphorus compounds to contact the polytrimethylene terephthalate or reactants in the process of producing polytrimethylene terephthalate. The selected phosphorus compounds are retained in the polytrimethylene terephthalate. The present invention also provides polytrimethylene terephthalate compositions containing amounts of phosphorus compounds.Type: GrantFiled: September 14, 2005Date of Patent: June 3, 2008Assignee: Shell Oil CompanyInventors: Donald Ross Kelsey, Cecilia Zuqi Tse, Robert Lawrence Blackbourn, Holger Georg Bachmann, Eckhard Seidel
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Patent number: 7196159Abstract: A process for the production of polytrimethylene terephthalate (PTT), wherein the process comprises: (i) one or more esterification steps, wherein terephthalic acid (TPA) or an alkyl diester of terephthalic acid is reacted with 1,3-propanediol (PDO); and (ii) one or more subsequent polycondensation steps, wherein the process further comprises the addition of a protic acid, other than terephthalic or isophthalic acid, before and/or during the one or more esterification steps, wherein the protic acid has a dissociation constant of at most 4 (pKa measured in water at 25° C.), and wherein the total amount of protic acid added before and/or during the one or more esterification steps is in the range of from 0.001 to 10 millimole of acid per kilogram of polytrimethylene terephthalate produced.Type: GrantFiled: September 30, 2005Date of Patent: March 27, 2007Assignee: Shell Oil CompanyInventors: Donald Ross Kelsey, Cecilia Zuqi Tse, Emery Don Johnson
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Patent number: 6800718Abstract: Process of producing polytrimethylene terephthalate (PTT) by esterification of terephthalic acid (TPA) with trimethylene glycol (TMG) in the presence of a catalytic, titanium compound, precondensation and polycondensation. The esterification is effected in at least two stages, where in the first stage a molar ratio of TMG to TPA of 1.25 to 2.5, a content of titanium of 0 to 40 ppm, a temperature of 245 to 260° C. as well as a pressure of 1 to 3.5 bar are adjusted. In the at least one subsequent stage a content of titanium is adjusted which is higher than in the initial stage by 35 to 110 ppm. For generating the vacuum in the polycondensation and in the precondensation, there are used vapor jet pumps operated with TMG vapor.Type: GrantFiled: July 31, 2002Date of Patent: October 5, 2004Assignees: Zimmer Aktiengesellschaft, Shell Oil CompanyInventors: Fritz Wilhelm, Eckhard Seidel, Hans Reitz, Ulrich Thiele, Klaus Mackensen, Donald Ross Kelsey, Robert Lawrence Blackbourn, Robert Stephen Tomaskovic
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Publication number: 20040014225Abstract: The present invention relates to a method for screening of polycondensation catalysts, wherein at least two polycondensation catalysis reactions are performed simultaneously under substantially equivalent conditions in at least two reaction cells which are present in one and the same room, using a sample comprising material to be polycondensated and a catalyst to be screened, and wherein the performances of the catalysts are analyzed.Type: ApplicationFiled: July 25, 2003Publication date: January 22, 2004Inventors: Donald Ross Kelsey, Kathleen Suzanne Kiibler
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Patent number: 6657044Abstract: An improved process for the polymerization of polytrimethylene terephthalate by esterification of terephthalic acid or dimethylterephthalate with 1,3-propanediol (PDO), precondensation of the esterification product to produce a precondensation product, and polycondensation of the precondensation product to produce polytrimethylene terephthalate wherein excess PDO is removed from the esterification and/or polycondensation stages and PDO vapor is separated from the high boiling fraction (solid byproduct). The improvement comprises: (a) heating the solid byproduct in the presence of about 5 ppm to about 5000 ppm, based on metal, of a metal catalyst selected from the group consisting of one or more 3rd, 4th, or 5th row metal compounds from Groups 3-12 and Groups 14-15 of the Periodic Table (IUPAC 1989) at a temperature of from about 100° C. to about 240° C.Type: GrantFiled: October 18, 2002Date of Patent: December 2, 2003Assignee: Shell Oil CompanyInventors: Donald Ross Kelsey, Kathleen Suzanne Kiibler, Wen Tzung Tang
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Patent number: 6576774Abstract: This invention is an improvement upon the known process for polymerization of polytrimethylene terephthalate by esterification of terephthalic acid or dimethyl terephthalate with 1,3-propane diol, precondensation of the esterification product to produce a precondensation product, and polycondensation of the precondensation product to produce polytrimethylene terephthalate and, optionally, solid stating of this product to produce higher intrinsic viscosity polytrimethylene terephthalate. The cyclic dimer of terephthalic acid and 1,3-propane diol is produced as a byproduct of the above process and the improvement comprises (a) recovering the cyclic dimer from the polymerization, (b) reacting from 0.5 to 25 percent by weight of the cyclic dimer in 1,3-propane diol in the presence of from 0.1 to 10 percent by weight of the cyclic dimer of a basic catalyst for five minutes to 24 hours at 50 to 210° C.Type: GrantFiled: June 26, 2001Date of Patent: June 10, 2003Assignee: Shell Oil CompanyInventors: Betty Marrou Scardino, Donald Ross Kelsey
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Patent number: 6512080Abstract: Process of producing polytrimethylene terephthalate (PTT) by esterification of terephthalic acid (TPA) with trimethylene glycol (TMG) in the presence of a catalytic titanium compound, precondensation and polycondensation. The esterification is effected in at least two stages, where in the first stage a molar ratio of TMG to TPA of 1.15 to 2.5, a content of titanium of 0 to 40 ppm, a temperature of 240 to 275° C., and a pressure of 1 to 5.0 bar, preferably 3.5 bar are used. In the at least one subsequent stage a content of titanium is adjusted which is higher than in the initial stage by 35 to 110 ppm.Type: GrantFiled: May 18, 2001Date of Patent: January 28, 2003Assignee: Shell Oil CompanyInventors: Donald Ross Kelsey, Robert Lawrence Blackbourn, Robert Stephen Tomaskovic, Hans Reitz, Eckhard Seidel, Fritz Wilhelm
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Patent number: 6509438Abstract: According to the invention, a polytrimethylene terephthalate is provided having 0.6 to less than 2 mole percent dipropylene glycol. Such compositions have a reduced tendency to generate acrolein when heated in air. These PTT polymer compositions exhibit improved and enhanced dyeability as compared to conventional PTT made by the DMT process and the TPA polycondensation/solid state polymerization processes.Type: GrantFiled: April 23, 2001Date of Patent: January 21, 2003Assignee: Shell Oil CompanyInventors: Donald Ross Kelsey, Betty Marrou Scardino, Kailash Dangayach, Houston Slade Brown, Hans Reitz, Eckhard Seidel, Fritz Wilhelm
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Publication number: 20020032302Abstract: This invention is an improvement upon the known process for polymerization of PTT by esterification of TPA or DMT with PDO, precondensation of the esterification product to produce a precondensation product, and polycondensation of the precondensation product to produce PTT and, optionally, solid stating of this product to produce higher intrinsic viscosity PTT.Type: ApplicationFiled: June 26, 2001Publication date: March 14, 2002Inventors: Betty Marrou Scardino, Donald Ross Kelsey
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Publication number: 20020028909Abstract: Process of producing polytrimethylene terephthalate (PTT) by esterification of terephthalic acid (TPA) with trimethylene glycol (TMG) in the presence of a catalytic titanium compound, precondensation and polycondensation. The esterification is effected in at least two stages, where in the first stage a molar ratio of TMG to TPA of 1.15 to 2.5, a content of titanium of 0 to 40 ppm, a temperature of 240 to 275° C., and a pressure of 1 to 3.5 bar are used. In the at least one subsequent stage a content of titanium is adjusted which is higher than in the initial stage by 35 to 110 ppm.Type: ApplicationFiled: May 18, 2001Publication date: March 7, 2002Inventors: Donald Ross Kelsey, Robert Lawrence Blackbourn, Robert Stephen Tomaskovic, Hans Reitz, Eckhard Seidel, Fritz Wilhelm
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Publication number: 20020009353Abstract: According to the invention, a polytrimethylene terephthalate is provided having 0.6 to less than 2 mole percent dipropylene glycol. Such compositions have a reduced tendency to generate acrolein when heated in air. These PTT polymer compositions exhibit improved and enhanced dyeability as compared to conventional PTT made by the DMT process and the TPA polycondensation/solid state polymerization processes.Type: ApplicationFiled: April 23, 2001Publication date: January 24, 2002Inventors: Donald Ross Kelsey, Betty Marrou Scardino, Kailash Dangayach, Houston Slade Brown, Hans Reitz, Eckhard Seidel, Fritz Wilhelm
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Patent number: 6326456Abstract: Process of producing polytrimethylene terephthalate (PTT) by esterification of terephthalic acid (TPA) with trimethylene glycol (TMG) in the presence of a catalytic titanium compound, precondensation and polycondensation. The sterification is effected in at least two stages, where in the first stage a molar ratio of TMG to TPA of 1.15 to 2.5, a content of titanium of 0 to 40 ppm, a temperature of 240 to 275° C., and a pressure of 1 to 3.5 bar are used. In the at least one subsequent stage a content of titanium is adjusted which is higher than in the initial stage by 35 to 110 ppm.Type: GrantFiled: May 18, 2001Date of Patent: December 4, 2001Assignee: Shell Oil CompanyInventors: Donald Ross Kelsey, Robert Lawrence Blackbourn, Robert Stephen Tomaskovic, Hans Reitz, Eckhard Seidel, Fritz Wilhelm
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Publication number: 20010029289Abstract: Process of producing polytrimethylene terephthalate (PTT) by esterification of terephthalic acid (TPA) with trimethylene glycol (TMG) in the presence of a catalytic titanium compound, precondensation and polycondensation. The esterification is effected in at least two stages, where in the first stage a molar ratio of TMG to TPA of 1.15 to 2.5, a content of titanium of 0 to 40 ppm, a temperature of 240 to 275° C., and a pressure of 1 to 3.5 bar are used. In the at least one subsequent stage a content of titanium is adjusted which is higher than in the initial stage by 35 to 110 ppm.Type: ApplicationFiled: May 18, 2001Publication date: October 11, 2001Inventors: Donald Ross Kelsey, Robert Lawrence Blackbourn, Robert Stephen Tomaskovic, Hans Reitz, Eckhard Seidel, Fritz Wilhelm
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Patent number: 6277947Abstract: Process of producing polytrimethylene terephthalate (PTT) by esterification of terephthalic acid (TPA) with trimethylene glycol (TMG) in the presence of a catalytic titanium compound, precondensation and polycondensation. The esterification is effected in at least two stages, where in the first stage a molar ratio of TMG to TPA of 1.15 to 2.5, a content of titanium of 0 to 40 ppm, a temperature of 240 to 275° C., and a pressure of 1 to 3.5 bar are used. In the at least one subsequent stage a content of titanium is adjusted which is higher than in the initial stage by 35 to 110 ppm.Type: GrantFiled: April 21, 2000Date of Patent: August 21, 2001Assignee: Shell Oil CompanyInventors: Donald Ross Kelsey, Robert Lawrence Blackbourn, Robert Stephen Tomaskovic, Hans Reitz, Eckhard Seidel, Fritz Wilhelm
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Patent number: 6245879Abstract: A process for preparing polytrimethylene terephthalate in which a carbonyl-containing 1,3-propanediol stream is purified for reuse of the 1,3-propanediol. The process involves reacting, under condensation polymerization conditions, terephthalic acid and a molar excess of 1,3-propanediol, with vacuum distillation and condensation of a major portion of the unreacted 1,3-propanediol. To this condensed stream is added a sufficient amount of base to raise the pH to a value greater than 7, and from this base-containing condensate the 1,3-propanediol is distilled and recycled to the polymerization reaction.Type: GrantFiled: January 29, 1999Date of Patent: June 12, 2001Assignee: Shell Oil CompanyInventors: Donald Ross Kelsey, Betty Marrou Scardino, Steven Charles Zronek
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Patent number: 6242558Abstract: A 1,3-propanediol-based aromatic polyester such as polytrimethylene terephthalate is modified by reaction with a hindered phenolic acid or ester to provide an endcapped polyester which has improved resistance to generation of acrolein when heated in air.Type: GrantFiled: November 27, 1996Date of Patent: June 5, 2001Assignee: Shell Oil CompanyInventor: Donald Ross Kelsey
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Patent number: 6093786Abstract: Polytrimethylene terephthalate is prepared in a process which includes adding a hindered phenol and an aromatic organophosphite to the polymerization reaction mixture. The process generates a reduced level of acrolein and prepares an improved polyester product compared with processes without the phenol and organophosphite additives.Type: GrantFiled: August 15, 1997Date of Patent: July 25, 2000Assignee: Shell Oil CompanyInventor: Donald Ross Kelsey
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Patent number: 5955562Abstract: A alternating aliphatic polyketone polymer is surface derivatized to alter the surface properties of an article without affecting the bulk properties of the polymer it is made from. Derivitization may be done with reducing agents and/or silylating agents. Articles so produced display a range of improved properties including reduced wettability and improved tribological properties such as lubricity and wear resistance.Type: GrantFiled: December 22, 1997Date of Patent: September 21, 1999Assignee: Shell Oil CompanyInventors: Carlton Edwin Ash, Donald Ross Kelsey