Patents by Inventor Oansuk Chung
Oansuk Chung 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: 11939473Abstract: A thermoplastic vulcanizate composition comprises: (i) a dispersed phase of rubber that is at least partially cured; (ii) a continuous thermoplastic phase including at least one thermoplastic polymer; (iii) a first polysiloxane composition comprising a migratory siloxane polymer physically dispersed in a first thermoplastic material and (iv) a second polysiloxane composition comprising a non-migratory, siloxane polymer bonded to a second thermoplastic material.Type: GrantFiled: December 7, 2018Date of Patent: March 26, 2024Assignee: Celanese International CorporationInventors: Prashant Bhadane, Chad Michael Houghton, Oscar Oansuk Chung, Eric Paul Jourdain, Hang Dong
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Patent number: 11359083Abstract: A thermoplastic vulcanizate composition comprises: (i) a dispersed phase of rubber that is at least partially cured; (ii) a continuous thermoplastic phase including at least one thermoplastic polymer; (iii) a first polysiloxane comprising a migratory liquid siloxane polymer; and (iv) a second polysiloxane comprising a non-migratory siloxane polymer bonded to a thermoplastic material.Type: GrantFiled: December 7, 2018Date of Patent: June 14, 2022Assignee: Celanese International CorporationInventors: Prashant Bhadane, Toshiaki Yamaguchi, Eric Paul Jourdain, Hang Dong, Weiqian Zhang, Oscar Oansuk Chung
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Publication number: 20210040299Abstract: A thermoplastic vulcanizate composition comprises: (i) a dispersed phase of rubber that is at least partially cured; (ii) a continuous thermoplastic phase including at least one thermoplastic polymer; (iii) a first polysiloxane comprising a migratory liquid siloxane polymer; and (iv) a second polysiloxane comprising a non-migratory siloxane polymer bonded to a thermoplastic material.Type: ApplicationFiled: December 7, 2018Publication date: February 11, 2021Inventors: Prashant Bhadane, Toshiaki Yamaguchi, Eric Paul Jourdain, Hang Dong, Weiqian Zhang, Oscar Oansuk Chung
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Publication number: 20200362148Abstract: A thermoplastic vulcanizate composition comprises: (i) a dispersed phase of rubber that is at least partially cured; (ii) a continuous thermoplastic phase including at least one thermoplastic polymer; (iii) a first polysiloxane composition comprising a migratory siloxane polymer physically dispersed in a first thermoplastic material and (iv) a second polysiloxane composition comprising a non-migratory, siloxane polymer bonded to a second thermoplastic material.Type: ApplicationFiled: December 7, 2018Publication date: November 19, 2020Inventors: Prashant Bhadane, Chad Michael Houghton, Oscar Oansuk Chung, Eric Paul Jourdain, Hang Dong
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Patent number: 7935763Abstract: In one embodiment is a thermoplastic vulcanizates having improved extrusion properties formed from a composition that includes from 20% to about 80% by weight of an elastomer, from about 80% to about 20% by weight of a thermoplastic, from about 0.05 to about 12 phr of a multifunctional methacrylate monomer peroxide curing coagent; and from about 0.02 to about 6 phr of a phosphorous containing stabilizer. The resultant thermoplastic vulcanizate may be cured with a peroxide curing agent and shows improved die lip build up compared to conventionally prepared thermoplastic vulcanizates. Methods of forming thermoplastic vulcanizates having improved die lip build up are also taught.Type: GrantFiled: October 11, 2006Date of Patent: May 3, 2011Assignee: ExxonMobil Chemical Patents Inc.Inventors: Oansuk Chung, Trazollah Ouhadi, Eugene R. Uhl
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Publication number: 20110028637Abstract: A method for preparing a thermoplastic vulcanizate, the method comprising introducing an elastomer and a thermoplastic resin to a reaction extruder, where the elastomer is not prepared by gas-phase polymerization methods, and where less than 75 parts by weight oil, per 100 parts by weight elastomer, is added to the extruder with the elastomer, introducing a curative to the extruder after said step of introducing an elastomer, introducing an oil to the extruder after said step of introducing an elastomer but before or together with said step of introducing a curative, and introducing an oil to the extruder after said step of introducing a curative.Type: ApplicationFiled: October 26, 2009Publication date: February 3, 2011Inventors: Maria Dolores Ellul, Hari Prasad Nadella, Oscar Oansuk Chung
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Patent number: 7872075Abstract: A method of preparing a thermoplastic vulcanizate, the method comprising continuously dynamically vulcanizing a rubber within a blend with a thermoplastic resin, where the dynamic vulcanization is effected with a cure system that includes a free-radical cure agent, and a coagent-wetted carrier where the coagent-wetted carrier includes a multi-functional acrylate coagent, a multi-functional methacrylate coagent, or both a multi-functional acrylate and multi-functional methacrylate coagent.Type: GrantFiled: October 7, 2005Date of Patent: January 18, 2011Assignee: ExxonMobil Chemical Patents Inc.Inventors: Maria D. Ellul, Oansuk Chung
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Patent number: 7625980Abstract: Thermoplastic vulcanizates having improved physical properties, including extrusion surface roughness can be achieved by a method that includes a first processing step to form a fully cured TPV base, a cooling step wherein the fully cured TPV base is solidified and a second processing step which imparts improved physical properties including improved extrusion surface roughness to the resultant TPV. The method may be adapted for use in conjunction with a peroxide curing agents to protect a portion of the thermoplastic, which may be polypropylene, from degradation by the peroxide curing agent. The adaptation to the methods may include the addition of a portion of the thermoplastic to the TPV after the peroxide curing agent has been added. The adaptation may also include one or more devolatalization steps with or without the addition of a stripping agent.Type: GrantFiled: July 11, 2006Date of Patent: December 1, 2009Assignee: ExxonMobil Chemical Patents Inc.Inventor: Oansuk Chung
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Patent number: 7622528Abstract: A process for the for the preparation of dynamically vulcanized thermoplastic elastomers is described. The process comprises melt processing under high shear conditions A) at least one thermoplastic engineering resin, B) at least one vulcanizable rubber, C) a curing agent or curing agents, and D) at least one additional thermoplastic engineering resin in the form of solid particles having an effective diameter of not less than 0.05 mm, wherein said solid particles D) are added to a molten mass of A), B) before, during or after the addition of C) but prior to substantial completion of the vulcanization of B). The process provides a means to avoid substantial degradation or unwanted cross-linking of the thermoplastic engineering resin and provides a means of controlling the reaction temperature during the curing, vulcanization, or cross-linking of the rubber.Type: GrantFiled: June 27, 2005Date of Patent: November 24, 2009Assignee: ExxonMobil Chemical Patents Inc.Inventors: Oansuk Chung, Peter W. Manders
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Publication number: 20080015313Abstract: Thermoplastic vulcanizates having improved physical properties, including extrusion surface roughness can be achieved by a method that includes a first processing step to form a fully cured TPV base, a cooling step wherein the fully cured TPV base is solidified and a second processing step which imparts improved physical properties including improved extrusion surface roughness to the resultant TPV. The method may be adapted for use in conjunction with a peroxide curing agents to protect a portion of the thermoplastic, which may be polypropylene, from degradation by the peroxide curing agent. The adaptation to the methods may include the addition of a portion of the thermoplastic to the TPV after the peroxide curing agent has been added. The adaptation may also include one or more devolatalization steps with or without the addition of a stripping agent.Type: ApplicationFiled: July 11, 2006Publication date: January 17, 2008Inventor: Oansuk Chung
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Publication number: 20070083008Abstract: A method of preparing a thermoplastic vulcanizate, the method comprising continuously dynamically vulcanizing a rubber within a blend with a thermoplastic resin, where the dynamic vulcanization is effected with a cure system that includes a free-radical cure agent, and a coagent-wetted carrier where the coagent-wetted carrier includes a multi-functional acrylate coagent, a multi-functional methacrylate coagent, or both a multi-functional acrylate and multi-functional methacrylate coagent.Type: ApplicationFiled: October 7, 2005Publication date: April 12, 2007Inventors: Maria Ellul, Oansuk Chung
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Publication number: 20070037931Abstract: In one embodiment is a thermoplastic vulcanizates having improved extrusion properties formed from a composition that includes from 20% to about 80% by weight of an elastomer, from about 80% to about 20% by weight of a thermoplastic, from about 0.05 to about 12 phr of a multifunctional methacrylate monomer peroxide curing coagent; and from about 0.02 to about 6 phr of a phosphorous containing stabilizer. The resultant thermoplastic vulcanizate may be cured with a peroxide curing agent and shows improved die lip build up compared to conventionally prepared thermoplastic vulcanizates. Methods of forming thermoplastic vulcanizates having improved die lip build up are also taught.Type: ApplicationFiled: October 11, 2006Publication date: February 15, 2007Inventors: Oansuk Chung, Trazollah Ouhadi, Eugene Uhl
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Publication number: 20060293458Abstract: A process for the for the preparation of dynamically vulcanized thermoplastic elastomers is described. The process comprises melt processing under high shear conditions A) at least one thermoplastic engineering resin, B) at least one vulcanizable rubber, C) a curing agent or curing agents, and D) at least one additional thermoplastic engineering resin in the form of solid particles having an effective diameter of not less than 0.05 mm, wherein said solid particles D) are added to a molten mass of A), B) before, during or after the addition of C) but prior to substantial completion of the vulcanization of B). The process provides a means to avoid substantial degradation or unwanted cross-linking of the thermoplastic engineering resin and provides a means of controlling the reaction temperature during the curing, vulcanization, or cross-linking of the rubber.Type: ApplicationFiled: June 27, 2005Publication date: December 28, 2006Inventors: Oansuk Chung, Peter Manders
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Publication number: 20030022996Abstract: A thermoplastic vulcanizate prepared by dynamically vulcanizing a rubber within a blend that comprises the rubber, a fluorine containing thermoplastic, and a vulcanizing agent; wherein the rubber is selected from nitrile rubber, hydrogenated nitrile rubber, amino-functionalized nitrile rubber, acrylonitrile-isoprene rubber, and mixtures thereof.Type: ApplicationFiled: June 17, 2002Publication date: January 30, 2003Applicant: The University of AkronInventors: Aubert Coran, Oansuk Chung
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Patent number: 6066697Abstract: A thermoplastic vulcanizate prepared by dynamically vulcanizing a rubber within a blend that comprises the rubber, a fluorine containing thermoplastic, and a vulcanizing agent; wherein the rubber is selected from nitrile rubber, hydrogenated nitrile rubber, amino-functionalized nitrile rubber, acrylonitrile-isoprene rubber, and mixtures thereof.Type: GrantFiled: August 25, 1998Date of Patent: May 23, 2000Assignee: The University of AkronInventors: Aubert Y. Coran, Oansuk Chung
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Patent number: 5936038Abstract: A vulcanizable elastomer having at least one pendant reactive amino group. The elastomer is vulcanized by using a phenolic-resin curative essentially in the absence of an activation catalyst, to form a vulcanizate. Also provided is a thermoplastic elastomeric vulcanizable composition of matter, employing the elastomer having the pendent reactive amino group, which may be dynamically vulcanized without the use of an activation catalyst. Further provided is a method for vulcanizing an elastomer having at least one pendent reactive amino group by utilizing a phenolic vulcanizing agent without the use of a catalyst.Type: GrantFiled: August 9, 1996Date of Patent: August 10, 1999Assignee: The University of AkronInventors: Aubert Y. Coran, Oansuk Chung