Patents by Inventor Kenneth W. Powers
Kenneth W. Powers 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: 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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Publication number: 20040054103Abstract: 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: ApplicationFiled: June 2, 2003Publication date: March 18, 2004Inventors: Robert N. Webb, David Y. Chung, Andrew B. Donnalley, Michael E. 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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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: 5548023Abstract: A method of compatibilizing a blend of at least a hydrocarbon polymer with at least one other polymer which is incompatible with the hydrocarbon polymer, said method comprising adding to the polymer blend a compatibilizer which is an isoolefin/para-alkylstyrene copolymer represented by the formula ##STR1## in which R and R' can be hydrogen, alkyl, and the primary and secondary alkyl halides, "a" ranges from about 14 to about 70,000, "b" ranges from 0 to about 70,000, "c" ranges from 0 to about 70,000, "d" ranges from about 1 to about 70,000, X is a halogen, and Nu is a nucleophilic residue provided by a polymeric nucleophile.Type: GrantFiled: March 13, 1995Date of Patent: August 20, 1996Assignee: Exxon Chemical Patents, Inc.Inventors: Kenneth W. Powers, Hsien-Chang Wang, T-C. Chung, Anthony J. Dias, Joseph A. Olkusz
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Patent number: 5548029Abstract: Graft copolymers which are isoolefin/para-alkylstyrene copolymer represented by the formula ##STR1## in which R and R' can be hydrogen, alkyl, and the primary and secondary alkyl halides, "a" ranges from about 14 to about 70,000, "b" ranges from 0 to about 70,000, "c" ranges from 0 to about 70,000, "d" ranges from about 1 to about 70,000, X is a halogen, and Nu is a nucleophilic residue provided by a polymeric nucleophile.Type: GrantFiled: March 15, 1995Date of Patent: August 20, 1996Assignee: Exxon Chemical Patents Inc.Inventors: Kenneth W. Powers, Hsien-Chang Wang, T-C. Chung, Anthony J. Dias, Joseph A. Olkusz
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Patent number: 5453465Abstract: A non-vulcanized thermoplastic composition comprising a polyamide and an elastomeric halogen-containing copolymer of a C.sub.4 to C.sub.7 isomonoolefin and a para-alkylstyrene is prepared by blending the polyamide and elastomeric copolymer in the presence of specified metal compounds in an amount insufficient for vulcanizing the composition. Optionally, the resulting composition may be subjected to vulcanization.Type: GrantFiled: May 14, 1993Date of Patent: September 26, 1995Assignee: Exxon Chemical Patents Inc.Inventors: Thomas C. Yu, Hsien C. Wang, Kenneth W. Powers
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Patent number: 5430118Abstract: A copolymer having a substantially homogeneous composition distribution, said copolymer comprising the direct reaction product of an isoolefin and para-alkylstrene.Type: GrantFiled: January 14, 1994Date of Patent: July 4, 1995Assignee: Exxon Chemical Patents Inc.Inventors: Kenneth W. Powers, Hsien-Chang Wang
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Patent number: 5426167Abstract: A copolymer having a substantially homogeneous composition distribution, said copolymer comprising the direct reaction product of an isoolefin and para-alkylstyrene.Type: GrantFiled: January 14, 1994Date of Patent: June 20, 1995Assignee: Exxon Chemical Patents Inc.Inventors: Kenneth W. Powers, Hsien-Chang Wang
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Patent number: 5369182Abstract: The invention relates to impact modifiers for polyamide compositions which improve the impact strength of the polyamides without adversely affecting the flexural modulus of the composition. The impact modifiers comprise blends of halogenated copolymers of a C.sub.4 to C.sub.7 isomonoolefin and an alkyl/styrene with a polyolefin.Type: GrantFiled: February 22, 1994Date of Patent: November 29, 1994Assignee: Exxon Chemical Patents Inc.Inventors: Thomas C. Yu, Kenneth W. Powers, Hsien C. Wang
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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.
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Patent number: 5244961Abstract: A non-vulcanized thermoplastic composition comprising a polyamide and an elastomeric halogen-containing copolymer of a C.sub.4 to C.sub.7 isomonoolefin and a para-alkylstyrene is prepared by blending the polyamide and elastomeric copolymer in the presence of specified metal compounds in an amount insufficient for vulcanizing the composition. Optionally, the resulting composition may be subjected to vulcanization.Type: GrantFiled: September 19, 1991Date of Patent: September 14, 1993Assignee: Exxon Chemical Patents Inc.Inventors: Thomas C. Yu, Hsien C. Wang, Kenneth W. Powers
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Patent number: 5182333Abstract: A substantially gel free C.sub.4 to C.sub.7 isoolefin homopolymer rubber, butyl copolymer rubber, halogenated butyl rubber (e.g., chlorinated or brominated), or mixtures thereof, comprising a molecular weight distribution such that the ratio of the moments of said molecular weight distribution, Mz/Mw, is equal to or exceeds 2.0, and that portion of said molecular weight distribution which is equal to and greater than 4 times the peak molecular weight, Mp, comprises greater than 8 percent of the total polymer species, and Mp is greater than about 250,000 and wherein said polymer species of molecular weight less than Mp are substantially branch free. Various means are disclosed for effecting the molecular weight distribution including blending of homopolymers and/or copolymers of appropriate molecular weight and molecular weight distribution and direct polymerization using a functional reagent to introduce branching.Type: GrantFiled: November 12, 1991Date of Patent: January 26, 1993Assignee: Exxon Chemical Patents Inc.Inventors: Kenneth W. Powers, Hsien-Chang Wang, Debra C. Handy, James V. Fusco
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Patent number: 5182350Abstract: Ozone resistant vulcanizable copolymers of isoolefins with non-conjugated dienes of the general formula: ##STR1## where R.sub.1 is ##STR2## and R.sub.2 is alkyl of 1 to 6 carbon atoms and vulcanizates thereof. The copolymers are prepared by polymerization in the presence of Lewis acids.Type: GrantFiled: October 30, 1990Date of Patent: January 26, 1993Assignee: Exxon Chemical Patents IncInventors: James V. Fusco, Hsien-Chang Wang, Kenneth W. Powers
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Patent number: 5162445Abstract: A copolymer of a C.sub.4 to C.sub.7 isoolefin and a para-alkylstyrene is provided as well as the corresponding halogenated, functionalized and grafted derivatives thereof. Processes for producing these copolymers are also provided.Type: GrantFiled: November 27, 1989Date of Patent: November 10, 1992Assignee: Exxon Chemical Patents Inc.Inventors: Kenneth W. Powers, Hsien-Chang Wang, T-C Chung, Anthony J. Dias, Joseph A. Olkusz
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Patent number: 5071913Abstract: A substantially gel free C.sub.4 to C.sub.7 isoolefin homopolymer rubber, butyl copolymer rubber, halogenated butyl rubber (e.g., chlorinated or brominated), or mixtures thereof, comprising a molecular weight distribution such that the ratio of the moments of said molecular weight distribution, Mz/Mw, is equal to or exceeds 2.0, and that portion of said molecular weight distribution which is equal to and greater than 4 times the peak molecular weight, Mp, comprises greater than 8 percent of the total polymer species, and Mp is greater than about 250,000 and wherein said polymer species of molecular weight less than Mp are substantially branch free. Various means are disclosed for effecting the molecular weight distribution including blending of homopolymers and/or copolymers of appropriate molecular weight and molecular weight distribution and direct polymerization using a functional reagent to introduce branching.Type: GrantFiled: December 11, 1987Date of Patent: December 10, 1991Assignee: Exxon Chemical Patents Inc.Inventors: Kenneth W. Powers, Hsien-Chang Wang, Debra C. Handy, James V. Fusco
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Patent number: 5013793Abstract: A dynamically vulcanized thermoplastic composition is provided which comprises a polymer blend of a thermoplastic olefinic resin, and an elastomeric halogen-containing copolymer of a C.sub.4 to C.sub.7 isomonoolefin and a paraalkylstyrene. A process for preparing the dynamically vulcanized composition is also provided.Type: GrantFiled: July 26, 1990Date of Patent: May 7, 1991Assignee: Exxon Chemical Patents Inc.Inventors: Hsien C. Wang, Kenneth W. Powers, Robert C. Puydak, Narayanaswami R. Dharmarajan
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Patent number: 4780513Abstract: Protection against molecular weight depression in the polymerization reaction producing polyisobutylene rubber or butyl rubber is achieved through addition of minor amounts of certain metal alkyls, particularly the lower alkyl aluminum compounds or lower alkyl aluminum hydrides which function as buffering, neutralizing or complexing agents against polymerization poisons and extraneous catalyst activators.Type: GrantFiled: July 24, 1986Date of Patent: October 25, 1988Assignee: Exxon Research & Engineering Co.Inventors: Kenneth W. Powers, Ralph H. Schatz
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Patent number: 4474924Abstract: Polymerization slurries of elastomeric isoolefin homopolymers and copolymers, such as butyl rubber, in diluents such as methyl chloride are effectively stabilized against agglomeration of polymer particles through addition of minor proportions of an hydrogenated preformed copolymer stabilizer having both a lyophobic and a lyophilic portion. The chemical and structural nature of the lyophobic and lyophilic portions which comprise the copolymer stabilizer are significant in determining the extent and method of hydrogenation for production of the most effective stabilizer. Agglomeration of polymer products is effectively prevented, yielding a number of significant processing advantages. The process is especially adaptable to the production of isobutylene-isoprene butyl rubber.Type: GrantFiled: January 27, 1983Date of Patent: October 2, 1984Assignee: Exxon Research & Engineering Co.Inventors: Kenneth W. Powers, Hsien C. Wang