Patents by Inventor Carl J. Giardino
Carl J. Giardino 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: 7531617Abstract: This invention relates to a continuous process for production of poly(trimethylene terephthalate), wherein gaseous 1,3-propanediol by product resulting from the process is condensed in a condenser, and a portion of the condensed by-product is recycled back into the process.Type: GrantFiled: December 14, 2006Date of Patent: May 12, 2009Assignee: E. I. du Pont de Nemours and CompanyInventors: John Harvey Eng, Emily A. Blum, Daniel Albert Green, Carl J. Giardino, Gene Parrish, Robert E. Trotter, Gary J. Wilson
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Patent number: 7524921Abstract: This invention relates to a continuous process for production of poly(trimethylene terephthalate), wherein gaseous 1,3-propanediol by-product resulting from the process is condensed in a condenser, the total amount of any trimethylene terephthalate cyclic dimer and poly(trimethylene terephthalate) in the condensed by-product 1,3-propanediol is adjusted, and a portion of the condensed by-product is recycled to the condenser while another portion is recycled back into the process.Type: GrantFiled: December 14, 2006Date of Patent: April 28, 2009Assignee: E. I. du Pont de Nemours and CompanyInventors: John Harvey Eng, Emily A. Blum, Daniel Albert Green, Carl J. Giardino, Gene Parrish, Robert E. Trotter, Gary J. Wilson
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Patent number: 7132484Abstract: A continuous process for the production of poly(trimethylene terephthalate) is disclosed. According to the process, a liquid feed mixture comprising bis-3-hydroxypropyl terephthalate and/or low molecular weight polyesters of 1,3-propanediol and terephthalic acid, the liquid feed mixture having a mole ratio of propylene groups to terephthalate groups of 1.1 to 2.2 is fed to a flasher. A first stream of gaseous by-products is continuously vaporized and removed from the flasher, and a liquid flasher reaction product having a mole ratio of propylene groups to terephthalate groups of less than about 1.5 is continuously withdrawn from the flasher. The liquid flasher reaction product is continuously fed to a prepolymerizer where it is continuously polymerized to form a poly(trimethylene terephthalate) prepolymer and a second stream of gaseous by-products.Type: GrantFiled: March 29, 2005Date of Patent: November 7, 2006Assignee: E. I. du Pont de Nemours and CompanyInventors: Carl J. Giardino, David B. Griffith, Chungfah Howard Ho, James M. Howell, Michelle Hoyt Watkins
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Patent number: 6951954Abstract: A process for the continuous production of at least one of bis(3-hydroxypropyl) terephthalate and low molecular weight oligomers of 1,3-propanediol and terephthalic acid is disclosed. According to the process, preheated 1,3-propanediol (about 150° C. to about 200° C.) and preheated lower dialkyl esters of terephthalic acid (about 150° C. to about 220° C.) are combined in a mole ratio of about 1.2:1 to about 2.3:1 and fed to an ester exchange vessel where the mixture undergoes a continuous transesterification reaction. The liquid reaction mixture is continuously heated and mixed, at a temperature of about 215° C. to about 250° C., and a pressure of about 800 mm Hg to about 1,000 mm Hg. Gaseous reaction products are continuously separated from the liquid reaction mixture, and a stream of liquid reaction products containing bis(3-hydoxypropyl) terephthalate and low molecular weight oligomers of 1,3-propanediol and terephthalic acid is continuously removed from a base portion of the ester exchange vessel.Type: GrantFiled: February 11, 2000Date of Patent: October 4, 2005Assignee: E.I. du Pont de Nemours and CompanyInventors: Carl J. Giardino, David B. Griffith, Chungfah Howard Ho, James M. Howell, Michelle Hoyt Watkins
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Publication number: 20030220465Abstract: A continuous process for the production of poly(trimethylene terephthalate) is disclosed. According to the process, a liquid feed mixture comprising bis-3-hydroxypropyl terephthalate and/or low molecular weight polyesters of 1,3-propanediol and terephthalic acid, the liquid feed mixture-having a mole ratio of propylene groups to terephthalate groups of 1.1 to 2.2 is fed to a flasher. A first stream of gaseous by-products is continuously vaporized and removed from the flasher, and a liquid flasher reaction product having a mole ratio of propylene groups to terephthalate groups of less than about 1.5 is continuously withdrawn from the flasher. The liquid flasher reaction product is continuously fed to a prepolymerizer where it is continuously polymerized to form a poly(trimethylene terephthalate) prepolymer and a second stream of gaseous by-products.Type: ApplicationFiled: February 25, 2003Publication date: November 27, 2003Inventors: Carl J. Giardino, David B. Griffith, Chungfah Howard Ho, James M. Howell, Michelle Hoyt Watkins
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Patent number: 6538076Abstract: A continuous process for the production of poly(trimethylene terephthalate) is disclosed. According to the process, a liquid feed mixture comprising bis-3-hydroxypropyl terephthalate and/or low molecular weight polyesters of 1,3-propanediol and terephthalic acid, the liquid feed mixture having a mole ratio of propylene groups to terephthalate groups of 1.1 to 2.2 is fed to a flasher. A first stream of gaseous by-products is continuously vaporized and removed from the flasher, and a liquid flasher reaction product having a mole ratio of propylene groups to terephthalate groups of less than about 1.5 is continuously withdrawn from the flasher. The liquid flasher reaction product is continuously fed to a prepolymerizer where it is continuously polymerized to form a poly(trimethylene terephthalate) prepolymer and a second stream of gaseous by-products.Type: GrantFiled: May 22, 2001Date of Patent: March 25, 2003Assignee: E. I. Du Pont de Nemours and CompanyInventors: Carl J. Giardino, David B. Griffith, Chungfah Howard Ho, James M. Howell, Michelle Hoyt Watkins
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Publication number: 20020132962Abstract: A continuous process for the production of poly(trimethylene terephthalate) is disclosed. According to the process, a liquid feed mixture comprising bis-3-hydroxypropyl terephthalate and/or low molecular weight polyesters of 1,3-propanediol and terephthalic acid, the liquid feed mixture-having a mole ratio of propylene groups to terephthalate groups of 1.1 to 2.2 is fed to a flasher. A first stream of gaseous by-products is continuously vaporized and removed from the flasher, and a liquid flasher reaction product having a mole ratio of propylene groups to terephthalate groups of less than about 1.5 is continuously withdrawn from the flasher. The liquid flasher reaction product is continuously fed to a prepolymerizer where it is continuously polymerized to form a poly(trimethylene terephthalate) prepolymer and a second stream of gaseous by-products.Type: ApplicationFiled: February 7, 2002Publication date: September 19, 2002Inventors: Carl J. Giardino, David B. Griffith, Chungfah Howard Ho, James M. Howell, Michelle Hoyt Watkins
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Publication number: 20020107348Abstract: A continuous process for the production of poly(trimethylene terephthalate) is disclosed. According to the process, a liquid feed mixture comprising bis-3-hydroxypropyl terephthalate and/or low molecular weight polyesters of 1,3-propanediol and terephthalic acid, the liquid feed mixture having a mole ratio of propylene groups to terephthalate groups of 1.1 to 2.2 is fed to a flasher. A first stream of gaseous by-products is continuously vaporized and removed from the flasher, and a liquid flasher reaction product having a mole ratio of propylene groups to terephthalate groups of less than about 1.5 is continuously withdrawn from the flasher. The liquid flasher reaction product is continuously fed to a prepolymerizer where it is continuously polymerized to form a poly(trimethylene terephthalate) prepolymer and a second stream of gaseous by-products.Type: ApplicationFiled: May 22, 2001Publication date: August 8, 2002Inventors: Carl J. Giardino, David B. Griffith, Chungfah Howard Ho, James M. Howell, Michelle Hoyt Watkins
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Patent number: 6353062Abstract: A continuous process for the production of poly(trimethylene terephthalate) is disclosed. According to the process, a liquid feed mixture comprising bis-3-hydroxypropyl terephthalate and/or low molecular weight polyesters of 1,3-propanediol and terephthalic acid, the liquid feed mixture having a mole ratio of propylene groups to terephthalate groups of 1.1 to 2.2 is fed to a prepolymerizer. Bis-3-hydroxypropyl terephthalate and the low molecular weight polyesters are continuously polymerized to form a poly(trimethylene terephthalate) prepolymer and a first stream of gaseous by-products. Poly(trimethylene terephthalate) prepolymer having a relative viscosity of at least about 5 is continuously withdrawn from the prepolymerizer and continuously fed to a final polymerizer, where it is continuously polymerized to form a higher molecular weight poly(trimethylene terephthalate) and a second stream of gaseous by-products.Type: GrantFiled: February 11, 2000Date of Patent: March 5, 2002Assignee: E. I. du pont de Nemours and CompanyInventors: Carl J. Giardino, David B. Griffith, Chungfah Howard Ho, James M. Howell, Michelle Hoyt Watkins, Joseph James Duffy