Patents by Inventor David Yen-Lung Chung
David Yen-Lung 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).
-
Patent number: 7414101Abstract: The invention provides for a process to produce polymers utilizing a hydrofluorocarbon diluent.Type: GrantFiled: May 22, 2007Date of Patent: August 19, 2008Assignee: ExxonMobil Chemical Patents Inc.Inventors: Timothy Daniel Shaffer, Scott Thomas Milner, Michael Gerard Matturro, David Yen-Lung Chung, Michael Francis McDonald, Robert Norman Webb
-
Publication number: 20080103272Abstract: The invention relates to new polymerization processes using hydrofluorocarbons to produce polymers. In particular, the invention relates to new polymerization processes using turbulent flow reactor systems using diluents including one or more hydrofluorocarbon(s) to produce polymers.Type: ApplicationFiled: June 25, 2004Publication date: May 1, 2008Inventors: Yuan-Ju ( Ray) Chen, Michael Francis McDonald, Timothy Daniel Shaffer, David Yen-Lung Chung, Robert Norman Webb
-
Patent number: 7332554Abstract: The invention relates to new polymerization processes including diluents including hydrofluorocarbons and their use to produce novel polymers with new sequence distributions. In particular, the invention relates to copolymers of an isoolefin, preferably isobutylene, and a multiolefin, preferably a conjugated diene, more preferably isoprene, with new sequence distributions.Type: GrantFiled: December 19, 2003Date of Patent: February 19, 2008Assignee: ExxonMobil Chemical Patents Inc.Inventors: Timothy Daniel Shaffer, David Yen-Lung Chung
-
Patent number: 7332555Abstract: The invention relates to new polymerization processes including diluents including hydrofluorocarbons and their use to produce novel polymers with new sequence distributions. In particular, the invention relates to copolymers of an isoolefin, preferably isobutylene, and a multiolefin, preferably a conjugated diene, more preferably isoprene, with new sequence distributions.Type: GrantFiled: December 10, 2004Date of Patent: February 19, 2008Assignee: ExxonMobil Chemical Patents Inc.Inventors: Timothy Daniel Shaffer, David Yen-Lung Chung
-
Patent number: 7329697Abstract: The present invention includes compositions suitable for tire treads or sidewalls and other articles where abrasion resistance and flexibility are desirable. The invention includes a tire tread or sidewall made by combining a filler; a sulfur cure system; optionally at least one secondary rubber; and at least one halogenated terpolymer of C4 to C8 isoolefin derived units, C4 to C14 multiolefin derived units, and p-alkylstyrene derived units. Examples of suitable fillers include carbon black, silica, and combinations thereof. The present invention also includes a method of producing an elastomeric terpolymer composition comprising combining in a diluent C4 to C8 isoolefin monomers, C4 to C14 multiolefin monomers, and p-alkylstyrene monomers in the presence of a Lewis acid and at least one initiator to produce the terpolymer.Type: GrantFiled: December 9, 2002Date of Patent: February 12, 2008Assignee: ExxonMobil Chemical Patents Inc.Inventors: Walter Harvey Waddell, David Yen-Lung Chung
-
Patent number: 7241831Abstract: The present invention includes compositions suitable for air barriers such as innerliners where adhesion to tire carcass materials (e.g., SBR) and flexibility are desirable, as well as low air permeability. The invention includes a tire innerliner made by combining a filler; a sulfur cure system; optionally at least one secondary rubber; and at least one halogenated terpolymer of C4 to C8 isoolefin derived units, C4 to C14 multiolefin derived units, and p-alkylstyrene derived units. Examples of suitable fillers include modified carbon black, carbon black, silica, exfoliated clays, and combinations thereof. The present invention also includes a method of producing an elastomeric terpolymer composition comprising combining in a diluent C4 to C8 isoolefin monomers, C4 to C14 multiolefin monomers, and p-alkylstyrene monomers in the presence of a Lewis acid and at least one initiator to produce the terpolymer.Type: GrantFiled: December 9, 2002Date of Patent: July 10, 2007Assignee: ExxonMobil Chemical Patents Inc.Inventors: Walter Harvey Waddell, David Yen-Lung Chung
-
Patent number: 7232872Abstract: The invention provides for a process to produce polymers utilizing a hydrofluorocarbon diluent.Type: GrantFiled: December 19, 2003Date of Patent: June 19, 2007Assignee: ExxonMobil Chemical Patents Inc.Inventors: Timothy Daniel Shaffer, Scott Thomas Milner, Michael Gerard Matturro, David Yen-Lung Chung, Michael Francis McDonald, Robert Norman Webb
-
Patent number: 6858690Abstract: The invention relates to a new catalyst system that improves the heat transfer capability of a butyl reactor slurry process system in the production of isobutylene-based polymers in continuous slurry polymerization processes. The process is carried out in an anhydrous polymerization system containing a mixture of the monomers in a polar diluent along with a Lewis acid and a C5 or greater initiator having a tertiary halide.Type: GrantFiled: July 25, 2003Date of Patent: February 22, 2005Assignee: ExxonMobil Chemical Patents Inc.Inventors: Robert Norman Webb, Michael Francis McDonald, David Yen-Lung Chung, Yuan-Ju Chen, Richard Dwight Hembree, John Patrick Soisson
-
Publication number: 20040249085Abstract: The present invention includes an isobutylene based terpolymer suitable for air barriers such as innerliners where adhesion to tire carcass materials (e.g., SBR) and flexibility are desirable, as well as low air permeability. The terpolymer in one embodiment is a halogenated terpolymer of C4 to C8 isoolefin derived units, C4 to C14 multiolefin derived units, and p-alkylstyrene derived units. The present invention also includes a method of producing an elastomeric terpolymer composition comprising combining in a polar diluent C4 to C8 isoolefin monomers, C4 to C14 multiolefin monomers, and p-alkylstyrene monomers in the presence of a Lewis acid and at least one initiator to produce the terpolymer.Type: ApplicationFiled: May 10, 2004Publication date: December 9, 2004Inventors: Walter Harvey Waddell, David Yen-Lung Chung
-
Publication number: 20040242795Abstract: The present invention includes compositions suitable for air barriers such as innerliners where adhesion to tire carcass materials (e.g., SBR) and flexibility are desirable, as well as low air permeability. The invention includes a tire innerliner made by combining a filler; a sulfur cure system; optionally at least one secondary rubber; and at least one halogenated terpolymer of C4 to C8 isoolefin derived units, C4 to C14 multiolefin drived units, and p-alkylstyrene derived units. Examples of suitable fillers include modified carbon black, carbon black, silica, exfoliated clays, and combinations thereof. The present invention also includes a method of producing an elastomeric terpolymer composition comprising combining in a diluent C4 to C8 isoolefin monomers, C4 to C14 multiolefin monomers, and p-alkylstyrene monomers in the presence of a Lewis acid and at least one initiator to produce the terpolymer.Type: ApplicationFiled: May 10, 2004Publication date: December 2, 2004Inventors: Walter Harvey Waddell, David Yen-Lung Chung
-
Publication number: 20040242731Abstract: The present invention includes compositions suitable for tire treads or sidewalls and other articles where abrasion resistance and flexibility are desirable. The invention includes a tire tread or sidewall made by combining a filler; a sulfur cure system; optionally at least one secondary rubber; and at least one halogenated terpolymer of C4 to C8 isoolefin derived units, C4 to C14 multiolefin derived units, and p-alkylstyrene derived units. Examples of suitable fillers include carbon black, silica, and combinations thereof. The present invention also includes a method of producing an elastomeric terpolymer composition comprising combining in a diluent C4 to C8 isoolefin monomers, C4 to C14 multiolefin monomers, and p-alkylstyrene monomers in the presence of a Lewis acid and at least one initiator to produce the terpolymer.Type: ApplicationFiled: May 10, 2004Publication date: December 2, 2004Inventors: Walter Harvey Waddell, David Yen-Lung Chung
-
Publication number: 20040059076Abstract: The invention relates to a new catalyst system that improves the heat transfer capability of a butyl reactor slurry process system in the production of isobutylene-based polymers in continuous slurry polymerization processes. The process is carried out in an anhydrous polymerization system containing a mixture of the monomers in a polar diluent along with a Lewis acid and a C5 or greater initiator having a tertiary halide.Type: ApplicationFiled: July 25, 2003Publication date: March 25, 2004Inventors: Robert Norman Webb, Michael Francis McDonald, David Yen-Lung Chung, Yuan-Ju Chen, Richard Dwight Hembree, John Patrick Soisson
-
Patent number: 6590039Abstract: Curable silylated copolymers based on olefin copolymers comprising at least one alpha-olefin and a vinyl aromatic monomer (alkyl styrene) are prepared by reacting the olefin copolymer with an olefinically unsaturated hydrolyzable silane in the presence of a free radical generating agent. The silylated copolymers are readily curable by contact with water (moisture) and a silanol condensation catalyst and are particularly useful as the polymeric component in sealant, caulking, adhesive and coating formulations.Type: GrantFiled: June 24, 2002Date of Patent: July 8, 2003Assignee: ExxonMobil Chemical Patents Inc.Inventors: Hsien-Chang Wang, David Yen-Lung Chung
-
Patent number: 6448322Abstract: Halogenated isobutylene-p-methylstyrene polymers are stabilized against discoloration with a weak base such as 100 to 500 ppm sodium bicarbonate. The additive is added to the rubbery polymers after dewatering in the finishing step of their manufacture. The curability of the stabilized rubbers is not adversely affected by the sodium bicarbonate additive.Type: GrantFiled: August 25, 1999Date of Patent: September 10, 2002Assignee: Exxon Mobil Chemical Patents Inc.Inventors: Richard C. Yeh, David Yen-Lung Chung, Chia Shian Chee
-
Patent number: 6380316Abstract: A copolymer of isobutylene with 0.5 to 15 mole percent of a conjugated diene (i.e., a butyl rubber) is reacted with a silane having both an alkenyl group as well as at least two silicon-bonded hydrolyzable group, the reaction taking place in the presence of a free-radical generator, to provide a modified copolymer having reactive silyl groups grafted thereto. The modified copolymer exhibits a reduced molecular weight relative to the starting copolymer and may be used to formulate moisture-curable sealants, caulks, adhesive and coatings.Type: GrantFiled: March 2, 1999Date of Patent: April 30, 2002Assignees: Dow Corning Corporation, ExxonMobil Chemical Patents Inc.Inventors: Maneesh Bahadur, David Yen-Lung Chung, Toshio Suzuki, Raymond Lee Tabler, Hsien-Chang Wang
-
Patent number: 6274689Abstract: The invention provides a copolymer of an isomonoolefin having from 4 to 7 carbon atoms and containing a copolymerized alkenyl styrene moiety represented by the formula I: where m=0-2, n=0-20, each of R1 through R7 are independently selected from the group consisting of hydrogen, C1 to C10 alkyl and C1 to C10 primary or secondary alkyl halides, and at least one of R1, R2 or R3 is hydrogen, and when m=1 or 2, R3 and R1 are —CH2—.Type: GrantFiled: October 7, 1998Date of Patent: August 14, 2001Assignee: Exxon Chemical Patents, Inc.Inventors: Timothy Daniel Shaffer, David Yen-Lung Chung
-
Patent number: 6177519Abstract: Curable silylated copolymers based on olefin copolymers comprising at least one C4 to C7 isomonoolefin and a vinyl aromatic monomer (alkyl styrene) are prepared by reacting the olefin copolymer with an olefinically unsaturated hydrolyzable silane in the presence of a free radical generating agent. The silylated copolymers are readily curable by contact with water (moisture) and a silanol condensation catalyst and are particularly useful as the polymeric component in sealant, caulking, adhesive and coating formulations.Type: GrantFiled: March 2, 1999Date of Patent: January 23, 2001Assignee: Exxon Chemical Patents, Inc.Inventors: David Yen-Lung Chung, Hsien-Chang Wang, Toshio Suzuki, Raymond Lee Tabler, Anil Kumar Saxena
-
Patent number: 5744429Abstract: The present invention relates to novel multifunctional viscosity modifiers comprising a mixture of derivatized ethylene-alpha olefin copolymers, A and B. Said A copolymer comprising from about 30 to about 60 weight percent monomer units derived from ethylene and said B copolymer comprising from about 60 to about 80 weight percent units derived from ethylene.Type: GrantFiled: June 27, 1996Date of Patent: April 28, 1998Assignee: Exxon Chemical Patents IncInventors: David Yen-Lung Chung, Paul Brice, Steven James Searis, Mark Joseph Struglinski, John Brooke Gardiner
-
Patent number: 5670582Abstract: A process for halogenating a copolymer of a C.sub.4 -C.sub.7 isomonoolefin, eg. isobutylene, and a para-alkylsyrene, e.g., para-methylstyrne, is disclosed. Increased halogenation efficiency is achieved by conducting the reaction under free radical halogenation conditions and in the presence of an oxidizing agent, e.g. hydrogen peroxide, which oxidizes hydrogen halide generated in-situ in the reaction back to free halogen. The oxidizing agent is preferably not added to the reaction medium until after first stage halogenation is substantially completed.Type: GrantFiled: July 24, 1996Date of Patent: September 23, 1997Assignee: Exxon Chemical Patents Inc.Inventors: David Yen-Lung Chung, Neil Frederick Newman
-
Patent number: 5651927Abstract: Multiple sequential chemical reactions on a polymeric feedstock are carried out in an extruder with multiple reaction zones. Each reaction zone has means for introduction of reagents, for mixing of reagents with polymer and for removal of by/co-products or unreacted reagents.Type: GrantFiled: June 5, 1996Date of Patent: July 29, 1997Assignee: Exxon Chemical Patents Inc.Inventors: Richard Stephen Auda, William Myers Davis, David Yen-Lung Chung, Lawrence William Flatley, Jr., Brenton George Jones, Donald Andrew White, Hans Gerlach Woudboer