Abstract: 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reaction product having a mole ratio of propylene groups to terephthalate groups of less than about 1.5 is continuously withdrawn from the flasher.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:
Grant
Filed:
May 22, 2001
Date of Patent:
March 25, 2003
Assignee:
E. I. Du Pont de Nemours and Company
Inventors:
Carl J. Giardino, David B. Griffith, Chungfah Howard Ho, James M. Howell, Michelle Hoyt Watkins
Abstract: Disclosed are physical blends of poly(1,3-propylene 2,6-naphthalate) polymer compositions with other polymers in which the concentration of poly(1,3-propylene 2,6-naphthalate) is from 1 to 99 mole %.
Abstract: Poly(trimethylene terephthalate) tetrachannel cross-section staple fibers, as well as yarns, fiberfill webs, batts and products, and fabrics made therewith. Also, the process of making such staple fibers, yarns, fiberfill webs, batts and products, and fabrics.
Type:
Grant
Filed:
August 22, 2001
Date of Patent:
October 1, 2002
Assignee:
E. I. du Pont de Nemours and Company
Inventors:
Ismael A. Hernandez, Geoffrey David Hietpas, James M. Howell, Claudia Schultze
Abstract: A poly(trimethylene terephthalate) polymer composition (a) comprising repeat units derived from terephthalic acid and 1,3- propanediol, (b) having a b value of less than about 10, and (c) having an intrinsic viscosity (IV) in the range from about 0.74 to about 2.0. The poly(trimethylene terephthalate) polymer composition does not contain a blue masking pigment. It is prepared by a process comnprising contacting, in the presence of a catalyst comprises tin and titanium. A copolymer that contains up to 20 mole percent of another acid and/or a second alcohol is also disclosed. Further disclosed is a composition of, or comprising, a bis (3-hydroxypropyl) terephthalalte prepolymer. The bis (3-hydroxypropyl) terephthalalte prepolymer and poly(trimethylene terephthalalte) can each contain 10 to 100 ppm tin and 10 to 200 ppm titanium relative to the terephthalic acid content.
Type:
Grant
Filed:
February 27, 2001
Date of Patent:
July 30, 2002
Assignee:
E. I. Du Pont De Nemours and Company
Inventors:
Joseph V Kurian, Yuanfeng Liang, Donald Edward Putzig
Abstract: Fine denier poly(trimethylene terephthalate) feed yarns and drawn yarns wherein the drawn yarns are characterized by a denier per filament less than 1.5 and are drawn such that the actual draw ratio is within 10 percent of the predicted draw ratio determined according to: [(elongation to break of the feed yarn)+115]/[(elongation to break of the drawn yarn)+115)] are disclosed.
Type:
Grant
Filed:
February 28, 2001
Date of Patent:
May 7, 2002
Assignee:
E. I. du Pont de Nemours and Company
Inventors:
James M. Howell, Joe Forrest London, Jr., Michelle H. Watkins
Abstract: 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:
Grant
Filed:
February 11, 2000
Date of Patent:
March 5, 2002
Assignee:
E. I. du pont de Nemours and Company
Inventors:
Carl J. Giardino, David B. Griffith, Chungfah Howard Ho, James M. Howell, Michelle Hoyt Watkins, Joseph James Duffy
Abstract: This invention relates to an improvement for the preparation of bis(3-hydroxypropyl) dicarboxylate monomers using 1,3-propanediol and a dialkyl dicarboxylate in the presence of a catalytic amount of such yttrium and/or samarium compounds as yttrium/samarium acetylacetonate or tris(2,2,6,6-tetramethyl-3,5-heptanedionato) yttrium/samarium which act as a catalyst for the transesterification reaction
Abstract: A process of preparing poly(trimethylene terephthalate) containing less than 2.0 mole % of DPG comprising:
(a) providing a molar amount of 1,3-propanediol:C1 to C4 dialkyl ester of terephthalic acid of 1.2:1 to 1.9:1,
(b) reacting the 1,3-propanediol with the C1 to C4 dialkyl ester of terephthalic, acid to form bis(3-hydroxypropyl)terephthalate monomer in the presence of 10-100 ppm (as titanium metal) of an organic titanate catalyst, by weight of the poly(trimethylene terephthalate), and
(c) polymerizing the bis(3-hydroxypropyl)terephthalate monomer to obtain the poly(trimethylene terephthalate); and
poly(trimethylene terephthalate) produced by the process.
Type:
Grant
Filed:
August 23, 2000
Date of Patent:
January 1, 2002
Assignee:
E. I. du Pont de Nemours and Company
Inventors:
Joseph Varapadavil Kurian, Yuanfeng Liang
Abstract: A stable partially oriented poly(trimethylene terephthalate) yarn suitable for use in subsequent drawing and/or draw-texturing operations characterized by an elongation to break of at least 110%, and a process for false-twist texturing a partially oriented poly(trimethylene terephthalate) yarn are disclosed.
Type:
Grant
Filed:
March 13, 2001
Date of Patent:
December 25, 2001
Assignee:
E. I. Du Pont De Nemours and Company
Inventors:
James M Howell, Joe F London, Jr., Michelle H Watkins
Abstract: The invention comprises polymer compositions containing 3-hydroxypropanoxy terminated polymer that exhibit reduced levels of degradation product emissions during processing, by contacting the polymer in the molten state with a melt stable, organic nitrogen-containing stabilizing compound, such as polyamide.
Type:
Grant
Filed:
February 17, 2000
Date of Patent:
December 18, 2001
Assignee:
E. I. Du Pont De Nemours and Company
Inventors:
Joseph Varapadavil Kurian, Jing Chung Chang
Abstract: A sizing agent for paper that is a 2-oxetanone ketene multimer which is not solid at 35° C., particularly a multimer mixture in which at least 25 weight percent of the hydrocarbon substituents contain irregularities such as branched alkyl groups or linear or branched alkenyl groups. Paper surface sized with the 2-oxetanone ketene multimer sizing agent and the method of surface sizing paper are also disclosed.
Type:
Grant
Filed:
November 8, 1999
Date of Patent:
December 4, 2001
Assignee:
Hercules Incorporated
Inventors:
Clement L. Brungardt, Richard J. Riehle, Jian Jian Zhang
Abstract: This invention relates to an improved process for the treatment of aqueous waste stream containing aldehydes and ketones, in particular, alpha, beta-ethylenically unsaturated aldehydes and ketones, which can be rendered non-toxic to biological treatment systems by contacting the waste stream with organic polyamines and/or inorganic ammonium compounds at essentially ambient conditions.
Type:
Grant
Filed:
March 21, 2001
Date of Patent:
December 4, 2001
Assignee:
E. I. du Pont de Nemours and Company
Inventors:
Joseph Varapadavil Kurian, Yuan Feng Liang
Abstract: Fine paper that is sized with a 2-oxetanone alkaline sizing agent and that does not encounter machine feed problems in high speed converting or reprographic machines, including continuous forms bond paper and adding machine paper, processes for converting the paper into envelopes, continuous forms bond paper and adding machine paper, and paper products of the processes.
Type:
Grant
Filed:
October 18, 1999
Date of Patent:
November 13, 2001
Assignee:
Hercules Incorporated
Inventors:
Donald K. Black, Kyle J. Bottorff, Clement Linus Brungardt, David Howard Dumas, Susan Merrick Ehrhardt, John Charles Gast, Jian-Jian Zhang
Abstract: A 2-oxetanone sizing agent that is made from fatty acid(s) containing linoleic acid. Paper that is sized with the 2-oxetanone alkaline sizing agent does not encounter machine feed problems in high speed converting or reprographic machines, so the sizing agent is useful for paper including continuous forms bond paper and adding machine paper, processes for converting the paper into envelopes, continuous forms bond paper and adding machine paper.
Abstract: This invention relates to a method of sizing paper comprising use of a sizing composition comprising: (a) at least one thermoplastic resin selected from the group consisting of thermoplastic rosins having an acid number less than 50, thermoplastic hydrocarbon resins, thermoplastic polyamides and thermoplastic amide waxes; (b) starch; and (c) surfactant. The sizing takes place substantially in the absence of alum or other aluminum based fixing agents.
Type:
Grant
Filed:
June 28, 1999
Date of Patent:
December 26, 2000
Assignee:
Hercules Incorporated
Inventors:
Robert Bates, Gerard J. Broekhuisen, Edwin R. Hensema, Malcolm J. Welch
Abstract: A food composition having a softening point of at least about 115.degree. F., and composed of an emulsion and a chemically set gel. The emulsion is prepared from water and a fat; the chemically set gel is prepared from a carbohydrate and water.
Type:
Grant
Filed:
October 4, 1994
Date of Patent:
December 26, 2000
Assignee:
Hercules Incorporated
Inventors:
Gary Andrew Luzio, Anne Elizabeth Tieleman
Abstract: A yarn comprising linear low density polyethylene fiber and nonmelting fiber or fiber having a melting point higher than the linear low density polyethylene fiber, and structures made therefrom.
Type:
Grant
Filed:
October 8, 1997
Date of Patent:
September 12, 2000
Assignee:
Hercules Incorporated
Inventors:
James D. Geiman, Rakesh K. Gupta, Randall E. Kozulla, Richard J. Legare, Robert G. MacLellan
Abstract: This invention relates to a sizing composition comprising (a) thermoplastic resin selected from the group consisting of thermoplastic rosins having an acid number less than 50, thermoplastic hydrocarbon resins, thermoplastic polyamides and thermoplastic amide waxes; (b) starch selected from the group consisting of natural, anionic, oxidized, amphoteric and modified starch; and (c) surfactant.
Type:
Grant
Filed:
June 23, 1999
Date of Patent:
June 13, 2000
Assignee:
Hercules Incorporated
Inventors:
Robert Bates, Gerard J. Broekhuisen, Edwin R. Hensema, Malcolm J. Welch
Abstract: A sizing agent for paper that is a 2-oxetanone ketene multimer which is not solid at 35.degree. C., particularly a multimer mixture in which at least 25 weight percent of the hydrocarbon substituents contain irregularities such as branched alkyl groups or linear or branched alkenyl groups. Paper surface sized with the 2-oxetanone ketene multimer sizing agent and the method of surface sizing paper are also disclosed.
Type:
Grant
Filed:
December 23, 1997
Date of Patent:
April 11, 2000
Assignee:
Hercules Incorporated
Inventors:
Clement L. Brungardt, Richard J. Riehle, Jian Jian Zhang
Abstract: Disclosed is a method for sizing paper at a pH of about 5.0-8.5 by incorporating a sizing composition consisting essentially of (1) rosin, (2) a cationic polyamine resin at a weight ratio of rosin to cationic polyamine of about 5:1 to about 1:2, and (3) up to 0.3% alum. The cationic polyamine resin is selected from the group consisting of polyalkyleneamine-epihalohydrin resins, polyalkyleneamine-dicyandiamide-epihalohydrin resins, poly(diallylamine.HCl)-epihalohydrin resins, poly(methyldiallylamine.HCl)-epihalohydrin resins, epihalohydrin-modified polyethyleneimine resins, amine-modified poly(methyldiallylamine.HCl)-epihalohydrin resins and mixtures thereof.