Patents by Inventor Michael F. McDonald
Michael F. McDonald 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: 7629397Abstract: Provided for herein is a process for separating a hydrocarbon-rubber from a hydrofluorocarbon diluent comprising contacting a polymer slurry comprising the hydrocarbon-rubber dispersed within the hydrofluorocarbon diluent with a hydrocarbon solvent capable of dissolving the hydrocarbon-rubber, to produce a first liquid phase and a second liquid phase, and separating the first liquid phase from the second liquid phase.Type: GrantFiled: June 23, 2006Date of Patent: December 8, 2009Assignee: ExxonMobil Chemical Patents Inc.Inventors: Michael F. McDonald, Scott T. Milner, D. Shaffer Timothy, N. Webb Robert, D. Hembree Richard
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Patent number: 7557170Abstract: The method of polymerization includes the steps of a) providing a catalyst system, b) providing at least one monomer or comonomer mixture in a reaction vessel, c) introducing the catalyst into the reaction vessel, and d) polymerizing the at least one monomer or comonomer mixture to produce an isoolefin polymer. The catalyst may be soluble in the diluent used for polymerization. The polymerization contact surfaces of the reaction vessel have an arithmetic average surface roughness of less than 0.3 ?m (12 microinches).Type: GrantFiled: July 24, 2008Date of Patent: July 7, 2009Assignee: ExxonMobil Chemical Patents Inc.Inventors: Timothy D. Shaffer, Pamela J. Wright, J. Davis Deborah, Michael F. McDonald
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Publication number: 20090062484Abstract: The method of polymerization includes the steps of a) providing a catalyst system, b) providing at least one monomer or comonomer mixture in a reaction vessel, c) introducing the catalyst into the reaction vessel, and d) polymerizing the at least one monomer or comonomer mixture to produce an isoolefin polymer. The catalyst may be soluble in the diluent used for polymerization. The polymerization contact surfaces of the reaction vessel have an arithmetic average surface roughness of less than 0.3 ?m (12 microinches).Type: ApplicationFiled: July 24, 2008Publication date: March 5, 2009Inventors: Timothy D. Shaffer, Pamela J. Wright, J. Davis Deborah, Michael F. McDonald
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Publication number: 20090062496Abstract: Provided is a method for reducing depositions in polymerization vessels, where the method includes the steps of providing a reaction vessel having polymerization contact surfaces, polishing a majority of the polymerization contact surfaces to have an average percent excess surface areas (SAxs) of 2% or less, introducing a catalyst system and at least one monomer or comonomer mixture in the reaction vessel, and polymerizing the at least one monomer or comonomer mixture. The catalyst may be soluble in the diluent used for polymerization. The method may be useful for low temperature polymerization systems.Type: ApplicationFiled: July 24, 2008Publication date: March 5, 2009Inventors: Timothy D. Shaffer, Pamela J. Wright, J. Davis Deborah, Michael F. McDonald
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Publication number: 20080287615Abstract: The present invention relates to a gas phase process for polymerizing one or more hydrocarbon monomer(s) in the presence of a catalyst system and a fluorinated hydrocarbon, where the fluorinated hydrocarbon is present at a partial pressure of 6.9 to 348 kPa in the reactor and the reactor temperature is from 30 to 120° C.Type: ApplicationFiled: May 19, 2005Publication date: November 20, 2008Inventors: Robert Olds Hagerty, Kevin B. Stavens, Randall B. Laird, Michael F. McDonald, Pradeep P. Shirodkar
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Publication number: 20080262180Abstract: Methods for producing elastomers or elastomeric compositions are provided. One or more C4 to C7 isoolefins and one or more comonomers can be polymerized in the presence of a diluent comprising one or more hydrofluorocarbons to provide a slurry comprising polymer product, unreacted monomer and the diluent. The slurry can be extruded to separate at least a portion of the diluent from the polymer product. The separated diluent can be recycled for polymerizing the one or more C4 to C7 isoolefins.Type: ApplicationFiled: April 20, 2007Publication date: October 23, 2008Inventors: Michael F. McDonald, Scott T. Milner, Timothy D. Shaffer, Robert N. Webb
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Publication number: 20080234447Abstract: The disclosure provides for a process and polymerization system to produce isoolefin polymers (72) utilizing polymorphogenates (16, 26) in the catalyst system to control polydispersity (MWD). The disclosure also provides a catalyst system (20) comprising a plurality of active catalyst complex species (34) formed by combination of a Lewis acid (24), an initiator (22) and a polymorphogenate (26), as well as polymers made using the catalyst system or process. The polymorphogenate (16, 26) can promote or mimic the formation of different active catalyst complex species (34) having different polymerization rates, i.e. different rates of propagation, chain transfer, or termination, as observed by different polydispersities resulting from the presence of relatively different proportions of the polymorphogenate.Type: ApplicationFiled: March 23, 2007Publication date: September 25, 2008Inventors: Timothy D. Shaffer, Michael F. McDonald, David Y. Chung, Robert N. Webb, Deborah J. Davis, Pamela J. Wright
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Patent number: 7402636Abstract: The disclosure provides a slurry polymerization system and method to decrease polymer deposition on reactor surfaces using an oxygenate such as alcohol (16) supplied to the polymerization medium (32) separate from the catalyst feed (34).Type: GrantFiled: March 23, 2007Date of Patent: July 22, 2008Assignee: ExxonMobil Chemical Patents IncInventors: Timothy D. Shaffer, Michael F. McDonald, David Y. Chung, Robert N. Webb, Deborah J. Davis, Pamela J. Wright
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Patent number: 7334229Abstract: A method for providing mutual exclusion at a single data element level for use in embedded systems. Entries for tasks that are currently holding a resource are stored in a hold list. Entries for tasks that are not currently executing and are waiting to be freed are stored in a wait list. A single mutual exclusion semaphore flags any request to access a resource.Type: GrantFiled: December 20, 2002Date of Patent: February 19, 2008Assignee: Cisco Technology, Inc.Inventors: Michael F. McDonald, Sumeet Arora, Mark Chu
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Publication number: 20070299190Abstract: Provided for herein is a process to produce an essentially homogeneous single liquid phase hydrocarbon-rubber cement from a polymer slurry comprising a hydrocarbon-rubber, a diluent, and unreacted monomer(s), the process comprising: (a) contacting the polymer slurry with a hydrocarbon solvent; and (b) removing the diluent in amounts not sufficiently more than is necessary to produce the essentially homogeneous single liquid phase hydrocarbon-rubber cement wherein the mass fraction of monomer(s) in the hydrocarbon-rubber cement, based on the total amount of hydrocarbon-rubber present in the hydrocarbon-rubber cement, is less than the mass fraction of monomer(s) in the hydrocarbon-rubber slurry, based on the total amount of hydrocarbon-rubber present in the hydrocarbon-rubber slurry, wherein the diluent comprises a hydrofluorocarbon.Type: ApplicationFiled: June 23, 2006Publication date: December 27, 2007Inventors: Michael F. McDonald, Scott T. Milner, D. Shaffer Timothy, N. Webb Robert, D. Hembree Richard
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Publication number: 20070299161Abstract: Provided for herein is a process for separating a hydrocarbon-rubber from a hydrofluorocarbon diluent comprising contacting a polymer slurry comprising the hydrocarbon-rubber dispersed within the hydrofluorocarbon diluent with a hydrocarbon solvent capable of dissolving the hydrocarbon-rubber, to produce a first liquid phase and a second liquid phase, and separating the first liquid phase from the second liquid phase.Type: ApplicationFiled: June 23, 2006Publication date: December 27, 2007Inventors: Michael F. McDonald, Scott T. Milner, D. Shaffer Timothy, N. Webb Robert, D. Hembree Richard
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Patent number: 6939933Abstract: 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 random copolymers of one or more isoolefin monomers and one or more conjugated diene monomers 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: February 14, 2001Date of Patent: September 6, 2005Assignee: ExxonMobil Chemical Patents Inc.Inventors: Robert N. Webb, David Y. Chung, Andrew B. Donnalley, Michael F. McDonald, Kenneth W. Powers, Ralph Howard Schatz
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Patent number: 6620898Abstract: The invention relates to a new improved catalyst to produce random copolymers of one or more iso-olefin monomers and one or more para-alkylstyrene monomers. The invention also relates to an improved continuous slurry polymerization process to produce random copolymers using the improved catalyst system. The process is carried out in an anhydrous polymerization system containing a mixture of the monomers in a polar solvent along with a Lewis acid and a stabilizing initiator.Type: GrantFiled: May 3, 2002Date of Patent: September 16, 2003Assignee: ExxonMobil Chemical Patents Inc.Inventors: Robert N. Webb, Kenneth W. Powers, Michael F. McDonald, Ralph Howard Schatz
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Patent number: 6560627Abstract: A method for providing mutual exclusion at a single data element level for use in embedded systems. Entries for tasks that are currently holding a resource are stored in a hold list. Entries for tasks that are not currently executing and are waiting to be freed are stored in a wait list. A single mutual exclusion semaphore flags any request to access a resource.Type: GrantFiled: January 28, 1999Date of Patent: May 6, 2003Assignee: Cisco Technology, Inc.Inventors: Michael F. McDonald, Sumeet Arora, Mark Chu
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Publication number: 20020173612Abstract: The invention relates to a new improved catalyst to produce random copolymers of one or more iso-olefin monomers and one or more para-alkylstyrene monomers. The invention also relates to an improved continuous slurry polymerization process to produce random copolymers using the improved catalyst system. The process is carried out in an anhydrous polymerization system containing a mixture of the monomers in a polar solvent along with a Lewis acid and a stabilizing initiator.Type: ApplicationFiled: May 3, 2002Publication date: November 21, 2002Inventors: Robert N. Webb, Kenneth W. Powers, Michael F. McDonald, Ralph Howard Schatz
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Patent number: 6444768Abstract: The invention relates to a new improved catalyst to produce random copolymers of one or more iso-olefin monomers and one or more para-alkylstyrene monomers. The invention also relates to an improved continuous slurry polymerization process to produce random copolymers using the improved catalyst system. The process is carried out in an anhydrous polymerization system containing a mixture of the monomers in a polar solvent along with a Lewis acid and a stabilizing initiator.Type: GrantFiled: October 6, 2000Date of Patent: September 3, 2002Assignee: ExxonMobil Chemical Patents Inc.Inventors: Robert N. Webb, Kenneth W. Powers, Michael F. McDonald, Ralph Howard Schatz
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Patent number: 6072576Abstract: A process plant for the manufacture of halobutyl rubber is provided with online monitoring and control of the process parameters to control the properties of the product. It incorporates an in-situ measurement system that does not require the removal of any sample material from the process. It uses a Fourier Transform Near Infrared (FTNIR) spectrometer, fiber-optic cables, a viscometer for measuring solution viscosity and a Resistance Temperature Device (RTD) for temperature measurement. An online real-time analyzer system using a Constrained Principal Spectral Analysis program predicts the property of the polymer product and provides the process control system with analysis of the data using derived relationships between the physical properties of the polymer and these spectral measurements and the measured values of fluid viscosity and temperature. Differences between the predicted and desired property of the product are used to control process parameters.Type: GrantFiled: December 8, 1997Date of Patent: June 6, 2000Assignee: Exxon Chemical Patents Inc.Inventors: Michael F. McDonald, Robert L. Long, Carl J. Thomas
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Patent number: 5417930Abstract: A novel chemical reactor: one particularly useful for the production of polymers, especially elastomers such as butyl rubber. The reactor contains (1) a two-tube pass system, constituted of an inner or center tube bundle through which a mixture or slurry of polymerizable monomers and catalyst is passed in one direction, and recycled via an outer tube bundle in the opposite direction in essentially even flow distribution, (2) while the tubes of the center and outer tubular bundles are maintained within a jacketed section, or sections of the reactor into which a coolant, or refrigerant, is injected and vaporized to remove the heat of reaction. The coolant, or refrigerant, in heat exchange relationship with the tubes removes the exothermic heats of reaction from the polymerization mixture, and maintains the polymerization mixture at uniformly low temperature.Type: GrantFiled: June 21, 1994Date of Patent: May 23, 1995Assignee: Exxon Chemical Patents Inc.Inventors: Michael F. McDonald, Jr., David J. Lawrence, Donald A. Williams
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Patent number: 5396021Abstract: A process for reducing the loss of monomers from a polymerization recycle stream comprising steam treating a molecular sieve used to dry the recycle stream to remove acidic sites within the sieve. The steam treatment is conducted at a temperature of between 150.degree. C. and 300.degree. C. for 2 to 24 hours.Type: GrantFiled: September 23, 1992Date of Patent: March 7, 1995Assignee: Exxon Chemical Products Inc.Inventors: William G. DePierri, Michael F. McDonald, Jr., Albert E. Schweizer
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Patent number: 5286804Abstract: A process for halogenating star-branched butyl rubber is provided wherein water and a wetting agent or wetting agent precursor are added to a solution comprising the star-branched butyl rubber, solid particles of branching agent and an organic solvent prior to the neutralization step to increase the rate of neutralization of the hydrogen halide by-product of the halogenation reaction.Type: GrantFiled: September 17, 1991Date of Patent: February 15, 1994Assignee: Exxon Chemical Patents Inc.Inventors: Kenneth W. Powers, Hsien C. Wang, Robert N. Webb, James V. Fusco, Hans F. Vanbrackle, Michael F. McDonald, Jr.