Patents by Inventor Gerhard K. Guenther
Gerhard K. Guenther 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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Publication number: 20090182100Abstract: Process for the polymerization of ethylene to produce a polymer of enhanced long chain branching. Ethylene and hydrogen are introduced into a first reaction zone to produce an ethylene polymer having a first molecular weight distribution. The polymer from the first reaction zone is applied to a second reaction zone along with ethylene and a C3-C8 alpha-olefin monomer. The second reaction zone is operated to produce a copolymer having a second molecular weight distribution different from the first molecular weight distribution. A polymer fluff of bimodal molecular weight distribution is recovered from the second reaction zone and heated to melt the fluff and then extruded. Concomitantly with the heating and or extrusion, the polymer fluff is treated in order to enhance the long chain branching and reduce the melt index MI5 of the polymer product.Type: ApplicationFiled: January 14, 2008Publication date: July 16, 2009Inventors: Gerhard K. Guenther, Steven D. Gray, Tim J. Coffy
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Patent number: 6984698Abstract: Disclosed is a method of modifying polyethylene to increase its ability to resist the transmission of water vapor. The polyethylene is modified to increase long chain branching resulting in lower water vapor transmission rates in films prepared with the modified polyethylene. The polyethylene can be modified using peroxides, air and even by admixture with high long chain branching content polyethylene. The polyethylene, particularly when in the form of films, can be used for preparing packaging where sorption of flavor, aroma, or colorant compounds must be minimized.Type: GrantFiled: October 15, 2003Date of Patent: January 10, 2006Assignee: Fina Technology, Inc.Inventors: Michael A. McLeod, Gerhard K. Guenther
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Patent number: 6846859Abstract: The present invention includes a polyolefin composition having reduced coloration with aging. The polyolefin composition comprises at least one polyolefin, an effective amount of a primary phenolic antioxidant to promote long term thermal stability of the polymer composition, and an effective amount of a phosphite processing stabilizer to promote thermal stability of the polymer composition during melt processing. The polymer composition further comprises an effective amount of a sacrificial phosphite antioxidant to reduce the yellowness index of the polymer composition. The sacrificial phosphite antioxidant and the phosphite processing stabilizer are not the same compound.Type: GrantFiled: May 31, 2002Date of Patent: January 25, 2005Assignee: Fina Technology, Inc.Inventors: Tim J. Coffy, Steven D. Gray, Gerhard K. Guenther
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Publication number: 20040132932Abstract: Polymerization processes for ethylene and at least one mono-1-olefin comonomer having from about three to eight carbon atoms per molecule in the presence of a twice-aged catalyst system comprising chromium supported on a silica-titania support and a trialkylboron compound is provided. Novel ethylene copolymers also are produced.Type: ApplicationFiled: October 10, 2003Publication date: July 8, 2004Inventors: Steven J. Secora, Gerhard K. Guenther, Elizabeth A. Benham, Max P. McDaniel, Joseph J. Bergmeister
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Publication number: 20040087745Abstract: A copolymer of ethylene and a higher alpha-olefin having broadened melt processing windows and reduced melt fracture can be produced using a chromium-containing catalyst system and a trialkyl boron cocatalyst. The polymerization process must be carefully controlled to produce a copolymer resin that easily can be made into articles of manufacture.Type: ApplicationFiled: June 26, 2003Publication date: May 6, 2004Applicant: Phillips Petroleum CompanyInventors: Ashish M. Sukhadia, Elizabeth A. Benham, Joseph J. Bergmeister, Rex L. Bobsein, Gerhard K. Guenther, Eric T. Hsieh, Max P. McDaniel, Steven J. Secora, Joseph S. Shveima, John D. Stewart
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Publication number: 20040082722Abstract: Disclosed is a method of modifying polyethylene to increase its ability to resist the transmission of water vapor. The polyethylene is modified to increase long chain branching resulting in lower water vapor transmission rates in films prepared with the modified polyethylene. The polyethylene can be modified using peroxides, air and even by admixture with high long chain branching content polyethylene. The polyethylene, particularly when in the form of films, can be used for preparing packaging where sorption of flavor, aroma, or colorant compounds must be minimized.Type: ApplicationFiled: October 15, 2003Publication date: April 29, 2004Applicant: Fina Technology, Inc.Inventors: Michael A. McLeod, Gerhard K. Guenther
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Patent number: 6706822Abstract: A method of processing polyethylene for use as an extruded blow molding resin to improve the properties and processability thereof is accomplished by modifying a polyethylene resin having a molecular weight distribution (Mw/Mn) of less than about 10. The modification is carried out by the addition of a free radical initiator to the resin during extrusion of the resin to increase the rheological breadth of the polyethylene from about 10% to about 60% compared to unmodified polyethylene resin extruded under similar conditions. In another aspect of the invention, a polyethylene resin having higher melt index is processed to provide a desired final melt index by the addition of a free radical initiator where it would otherwise be necessary to utilize a resin having lower melt flow, and which is more difficult to process. Improvements in color can also be obtained.Type: GrantFiled: June 13, 2002Date of Patent: March 16, 2004Assignee: Fina Technology, Inc.Inventors: Gerhard K. Guenther, Lea Ann Nairn, Curt D. Clark, Ben W. Hicks, Ronald A. Tharappel, Tim J. Coffy
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Publication number: 20030225194Abstract: The present invention includes a polyolefin composition having reduced coloration with aging. The polyolefin composition comprises at least one polyolefin, an effective amount of a primary phenolic antioxidant to promote long term thermal stability of the polymer composition, and an effective amount of a phosphite processing stabilizer to promote thermal stability of the polymer composition during melt processing. The polymer composition further comprises an effective amount of a sacrificial phosphite antioxidant to reduce the yellowness index of the polymer composition. The sacrificial phosphite antioxidant and the phosphite processing stabilizer are not the same compound.Type: ApplicationFiled: May 31, 2002Publication date: December 4, 2003Inventors: Tim J. Coffy, Steven D. Gray, Gerhard K. Guenther
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Patent number: 6657023Abstract: Polymerization processes for ethylene and at least one mono-1-olefin comonomer having from about three to eight carbon atoms per molecule in the presence of a twice-aged catalyst system comprising chromium supported on a silica-titania support and a trialkylboron compound is provided. Novel ethylene copolymers also are produced.Type: GrantFiled: January 31, 2001Date of Patent: December 2, 2003Assignee: Phillips Petroleum CompanyInventors: Joseph J. Bergmeister, Steven J. Secora, Gerhard K. Guenther, Elizabeth A. Benham, Max P. McDaniel
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Patent number: 6617403Abstract: A copolymer of ethylene and a higher alpha-olefin having broadened melt processing windows and reduced melt fracture can be produced using a chromium-containing catalyst system and a trialkyl boron cocatalyst. The polymerization process must be carefully controlled to produce a copolymer resin that easily can be made into articles of manufacture.Type: GrantFiled: August 20, 2001Date of Patent: September 9, 2003Assignee: Phillips Petroleum CompanyInventors: Ashish M. Sukhadia, Elizabeth A. Benham, Joseph J. Bergmeister, Rex L. Bobsein, Gerhard K. Guenther, Eric T. Hsieh, Max P. McDaniel, Steven J. Secora, Joseph S. Shveima, John D. Stewart
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Publication number: 20030055170Abstract: A method of processing polyethylene for use as an extruded blow molding resin to improve the properties and processability thereof is accomplished by modifying a polyethylene resin having a molecular weight distribution (Mw/Mn) of less than about 10. The modification is carried out by the addition of a free radical initiator to the resin during extrusion of the resin to increase the rheological breadth of the polyethylene from about 10% to about 60% compared to unmodified polyethylene resin extruded under similar conditions. In another aspect of the invention, a polyethylene resin having higher melt index is processed to provide a desired final melt index by the addition of a free radical initiator where it would otherwise be necessary to utilize a resin having lower melt flow, and which is more difficult to process.Type: ApplicationFiled: June 13, 2002Publication date: March 20, 2003Inventors: Gerhard K. Guenther, Lea Ann Naim, Curtis D. Clark, Ben W. Hicks, Ronald A. Tharappel, Tim J. Coffy
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Patent number: 6433103Abstract: A method of processing polyethylene for use as an extruded blow molding resin to improve the properties and processability thereof is accomplished by modifying a polyethylene resin having a molecular weight distribution (Mw/Mn) of less than about 10. The modification is carried out by the addition of a free radical initiator to the resin during extrusion of the resin to increase the rheological breadth of the polyethylene from about 10% to about 60% compared to unmodified polyethylene resin extruded under similar conditions. In another aspect of the invention, a polyethylene resin having higher melt index is processed to provide a desired final melt index by the addition of a free radical initiator where it would otherwise be necessary to utilize a resin having lower melt flow, and which is more difficult to process. Improvements in color can also be obtained.Type: GrantFiled: January 31, 2001Date of Patent: August 13, 2002Assignee: Fina Technology, Inc.Inventors: Gerhard K. Guenther, Lea Ann Nairn, Curt D. Clark, Ben W. Hicks, Ronald A. Tharappel, Tim J. Coffy
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Publication number: 20020028891Abstract: A copolymer of ethylene and a higher alpha-olefin having broadened melt processing windows and reduced melt fracture can be produced using a chromium-containing catalyst system and a trialkyl boron cocatalyst. The polymerization process must be carefully controlled to produce a copolymer resin that easily can be made into articles of manufacture.Type: ApplicationFiled: August 20, 2001Publication date: March 7, 2002Applicant: Phillips Petroleum CompanyInventors: Ashish M. Sukhadia, Elizabeth A. Benham, Joseph J. Bergmeister, Rex L. Bobsein, Gerhard K. Guenther, Eric T. Hsieh, Max P. McDaniel, Steven J. Secora, Joseph S. Shveima, John D. Stewart
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Publication number: 20010007894Abstract: Polymerization processes for ethylene and at least one mono-1-olefin comonomer having from about three to eight carbon atoms per molecule in the presence of a twice-aged catalyst system comprising chromium supported on a silica-titania support and a trialkylboron compound is provided. Novel ethylene copolymers also are produced.Type: ApplicationFiled: January 31, 2001Publication date: July 12, 2001Applicant: Phillips Petroleum CompanyInventors: Joseph J. Bergmeister, Steven J. Secora, Gerhard K. Guenther, Elizabeth A. Benham, Max P. McDaniel
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Patent number: 6204346Abstract: Polymerization processes for ethylene and at least one mono-1-olefin comonomer having from about three to eight carbon atoms per molecule in the presence of a twice-aged catalyst system comprising chromium supported on a silica-titania support and a trialkylboron compound is provided. Novel ethylene copolymers also are produced.Type: GrantFiled: December 17, 1998Date of Patent: March 20, 2001Assignee: Phillips Petroleum Co.Inventors: Joseph J. Bergmeister, Steven J. Secora, Gerhard K. Guenther, Elizabeth A. Benham, Max P. McDaniel
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Patent number: 5248756Abstract: Disclosed is an alternating block copolymer composition useful for enhancing the crystallization of bisphenol-A polycarbonate which comprises the reaction product of a polyoxyalkylene polyamine and poly(ethylene)terephthalate. Also disclosed is a method of synthesizing the alternating block copolymer and a method of using the block copolymer composition in the crystallization of bisphenol-A polycarbonate.Type: GrantFiled: January 22, 1992Date of Patent: September 28, 1993Assignee: Texaco Chemical CompanyInventors: Chih-Chien Hsu, Gerhard K. Guenther, Richele T. Howelton, David E. Bergbreiter, Alan Letton, Pei-Hua Wang