Patents by Inventor Dawid Johannes Joubert
Dawid Johannes Joubert 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: 7285607Abstract: This invention relates to a process for producing a polymeric product by the polymerisation of at least one olefinic compound in the form of an olefin or a compound including an olefinic moiety by contacting the at least one olefinic compound with a polymerisation catalyst. The catalyst comprises the combination of a source of a Group IV to VI transition metal; and a ligating compound of the formula (R1)mX1(Y)X2(R2)n. The process is characterised therein that when R1 and R2 are independently a hydrocarbyl group or a heterohydrocarbyl group which contains at least one non-polar substituent, the olefinic compound is contacted with the polymerisation catalyst at a reaction temperature from and above 70° C.; and where R1 and R2 are independently a hydrocarbyl group or a heterohydrocarbyl group which contains no substituent, the olefinic compound is contacted with the polymerisation catalyst at a reaction temperature from and above 90° C.Type: GrantFiled: May 17, 2005Date of Patent: October 23, 2007Assignee: Sasol, Chemical Industries, LimitedInventors: Kevin Blann, Deon De Wet-Roos, Dawid Johannes Joubert, Esna Killian, John Thomas Dixon, Nonhlanhla Jillian Phelembe, Aletta Du Toit
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Publication number: 20030225224Abstract: A polymer includes at least propylene as a first monomeric component, 1-pentene as a second monomeric component, and, as a third monomeric component, a third olefin. The third olefin has fewer than 5 carbon atoms, is linear and is not propylene, or has 5 carbon atoms and is branched, or has more than 5 carbon atoms and is linear or branched.Type: ApplicationFiled: May 28, 2002Publication date: December 4, 2003Applicant: SASOL TECHNOLOGY (PROPRIETARY) LIMITEDInventors: Ioan Tincul, Dawid Johannes Joubert, Udo Maximilian Wahner, Sarel Petrus Jacobus Smith, Pieter Willem Van Zyl
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Publication number: 20030008988Abstract: A polymer of ethylene as a first monomeric component, with a high carbon number linear alpha olefin having at least five carbon atoms as a second monomeric component. At least one of the monomeric components is Fischer-Tropsch derived so that it includes at least one other olefinic component. A process for producing the polymer is also provided.Type: ApplicationFiled: January 29, 2001Publication date: January 9, 2003Applicant: SASOL TECHNOLOGY (PROPRIETARY) LIMITEDInventors: Ioan Tincul, Dawid Johannes Joubert, Desmond Austin Young
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Patent number: 6417300Abstract: Disclosed are terpolymers and processes of terpolymerization, wherein the terpolymer comprises units derived from ethylene, 1-pentene and another alpha-olefin containing at least six carbon atoms.Type: GrantFiled: May 12, 1999Date of Patent: July 9, 2002Assignee: Sasol Technology Proprietary LimitedInventors: Dawid Johannes Joubert, Ignatius Hendrik Potgieter, Ioan Tincul
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Patent number: 6391987Abstract: Process for producing a propylene/1-pentene polymer in the presence of a Ziegler-Natta catalyst system with the monomer reactants being in the vapor phase while the reaction is in process and with no liquid component being present in the reaction zone while the reaction is in progress. Different ways of introducing the reactants are disclosed (partly in liquid phase then immediately evaporated or not, preheated or not, mixed with the comonomer or not).Type: GrantFiled: December 22, 1999Date of Patent: May 21, 2002Assignee: Sasol Technology (Proprietary) LimitedInventors: Ioan Tincul, Ignatius Hendrik Potgieter, Dawid Johannes Joubert, Antonie Hermanus Potgieter
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Patent number: 6391951Abstract: The invention provides a copolymer of propylene and pentene, together with a process for producing such copolymer and a polymer composition. In the process, propylene and pentene are reacted in a reaction zone at a pressure of 60 kg/cm2 and temperature of 0-100° C. for 20-480 minutes in the presence of a Ziegler-Natta catalyst or catalyst system. The polymer composition has several components, namely the above copolymer, a phenolic stabilizer, an organic phosphite stabilizer, a thioether stabilizer and at least one metal salt of a higher aliphatic acid, with the proviso that at least one of the organic phosphite stabilizer, the thioether stabilizer and said salt must be present, so that up to two thereof can optionally be omitted.Type: GrantFiled: July 13, 2000Date of Patent: May 21, 2002Assignee: Sasol Technology (Proprietary) LimitedInventors: Dawid Johannes Joubert, Antonie Hermanus Potgieter, Ignatius Hendrik Potgieter, Ioan Tincul
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Publication number: 20020026017Abstract: A polymer obtained from a first olefin having fewer than 4 carbon atoms, and a second olefin having a total number of carbon atoms greater than 5 and having an uneven number of carbon atoms. The molar proportion of the first olefin to the second olefin in the polymer is from 90:10 to 99.9:0.1. A process for producing the polymer is also provided.Type: ApplicationFiled: May 23, 2001Publication date: February 28, 2002Applicant: SASOL TECHNOLOGY (PTY) LIMITEDInventors: Ioan Tincul, Dawid Johannes Joubert, Ignatius Hendrik Potgieter, Desmond Austin Young
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Publication number: 20010025091Abstract: The invention provides a polymer of ethylene as a first component or monomer, with a branched olefin as a second component or monomer, and at least one different olefin as a third component or monomer. The olefins can be obtained from a Fischer-Tropsch process.Type: ApplicationFiled: March 12, 2001Publication date: September 27, 2001Applicant: SASOL TECHNOLOGY (PROPRIETARY) LIMITEDInventors: Ioan Tincul, Dawid Johannes Joubert, Desmond Austin Young
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Patent number: 6248685Abstract: A method of making a catalyst suitable for the polymerization of olefins includes the steps of mixing an ether having a total number of carbon atoms equal to or greater than 8, with hydrated magnesium chloride, to produce partially activated magnesium chloride; mixing an alkyl aluminum with the partially activated magnesium chloride to form unwashed activated magnesium chloride; and washing the activated magnesium chloride with an inert saturated hydrocarbon liquid, to obtain an activated magnesium chloride-containing slurry. A plurality of alcohols are mixed with the activated magnesium chloride-containing slurry to form an activated magnesium chloride/alcohol complex. Titanium tetrachloride is mixed with the activated magnesium chloride/alcohol complex, to form a magnesium chloride supported titanium catalyst.Type: GrantFiled: April 1, 1999Date of Patent: June 19, 2001Assignee: Sasol Technology PTY LimitedInventors: Dawid Johannes Joubert, Ignatius Hendrik Potgieter, Ioan Tincul
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Patent number: 6191246Abstract: The invention provides a polymer which is a polymerization product obtained by polymerizing at least ethylene, 1-pentene and 1-hexene; and a process for producing a polymer by reacting at least ethylene, 1-pentene and 1-hexene in a reaction zone at a pressure between atmospheric and 60 kg/cm3 and at a temperature between 30° C. and 120° C., in the presence of a catalyst system. The invention also provides a polymer composition which comprises a terpolymer of ethylene, 1-pentene and 1-hexene, a phenolic stabilizer component, a metal salt of a higher aliphatic acid, and, optionally, at least one organic phosphite stabilizer.Type: GrantFiled: January 12, 1998Date of Patent: February 20, 2001Assignee: Sasol Technology (Proprietary) LimitedInventors: Dawid Johannes Joubert, Ignatius Hendrik Potgieter, Ioan Tincul, Peter Loggenberg
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Patent number: 6111047Abstract: The invention provides a copolymer of propylene and pentene, together with a process for producing such copolymer. The copolymer has a random arrangement of propylene and 1-pentene, is theromplastic, has crystalline and amorphous sequences, and has a melt flow index in the range of about 0.01 to about 200 g/10 minutes. In the process, propylene and pentene are reacted in a reaction zone at a pressure of 60 kg/cm.sup.2 and temperature of 0-100.degree. C. for 20-480 minutes in the presence of a Ziegler-Natta catalyst or catalyst system.Type: GrantFiled: October 28, 1997Date of Patent: August 29, 2000Assignee: Sasol Technology (Proprietary) LimitedInventors: Dawid Johannes Joubert, Antonie Hermanus Potgieter, Ignatius Hendrik Potgieter, Ioan Tincul