Patents by Inventor Helmut Heinze

Helmut Heinze 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).

  • Patent number: 4680376
    Abstract: A process for continuous production of high molecular polybutyleneterephthalate by direct esterification of terephthalic acid and 1,4 butanediol in the presence of tin- or titanium-containing catalysts at preferred temperatures of to C., and preferred pressures of 0.3 to 0.6 bar during the first stage--with minimal formation of tetrahydrofurane--followed by precondensation and polycondensation at reduced pressure.
    Type: Grant
    Filed: June 5, 1986
    Date of Patent: July 14, 1987
    Assignee: Davy McKee A.G.
    Inventors: Helmut Heinze, Fritz Wilhelm
  • Patent number: 4499261
    Abstract: Continuous multistep, economical, energy-saving process for making polybutylene terephthalate in which the butanediol-1,4 used to transesterify dimethyl terephthalate is supplied from the condensed vapors volatilized during the precondensation and polycondensation steps of the process. These vapors, which contain low-soluble esters of terephthalic acid as well as butanediol, are condensed by contact with fresh butanediol, and volatilized butanediol containing the esters is recycled to the initial transesterification stage for reaction with dimethyl terephthalate. No additional butanediol is required for the reaction.
    Type: Grant
    Filed: February 22, 1984
    Date of Patent: February 12, 1985
    Assignee: Davy McKee AG
    Inventors: Helmut Heinze, Fritz Wilhelm, Klaus Mackensen, Ferdinand Finkeldei
  • Patent number: 4263425
    Abstract: Polyethylene terephthalate having an acetaldehyde content of less than 2.5 ppm and suitable for packing of food and beverages intended for human consumption is produced by heating polyethylene terephthalate having an intrinsic viscosity of about 0.5--0.85 at a temperature of C., preferably C., for about 4 to 12 hours. The polyethylene terephthalate must not include more than 25 ppm of ester interchange catalyst or 20 ppm of phosphorous during this heating.
    Type: Grant
    Filed: November 8, 1978
    Date of Patent: April 21, 1981
    Assignee: Zimmer Aktiengesellschaft
    Inventors: Hans-Jochen Rothe, Peter Freund, Werner Gey, Helmut Heinze
  • Patent number: 4077945
    Abstract: A batch process for esterifying ethylene glycol and terephthalic acid at elevated temperature and pressure in which a part of the ethylene glycol required for the complete esterification reaction is placed in an autoclave and heated under pressure, and the remainder of the glycol is added to said heated glycol in the form of a paste with terephthalic acid. Preferably the glycol initially present in the autoclave amounts to 0.3 to 0.8 moles per mole of terephthalic acid while the glycol added as a paste amounts to 1.4 to 0.9 moles per mole of terephthalic acid. The glycol initially in the autoclave may be glycol reclaimed from the mixture volatilized during the reaction and may contain up to 20% water, preferably 2-6% water.
    Type: Grant
    Filed: April 18, 1977
    Date of Patent: March 7, 1978
    Assignee: Zimmer Aktiengesellschaft
    Inventors: Helmut Heinze, Eberhard Hackel
  • Patent number: 4069194
    Abstract: A separating or anticaking agent consisting of spherical glass particles having a diameter of 3 to is added to polyester resin granulates to prevent agglomeration during solid state polycondensation in a plug-flow reactor. Thin-walled articles formed from the end product are characterized by high strength, high transparency, crystal clear color, good gas impermeability and a smooth surface.
    Type: Grant
    Filed: November 7, 1975
    Date of Patent: January 17, 1978
    Assignee: Zimmer Aktiengesellschaft
    Inventors: Werner Gey, Wolfgang Langhauser, Helmut Heinze, Hans-Joachim Rothe, Peter Freund
  • Patent number: 4064112
    Abstract: This invention relates to a process for the continuous production of high molecular weight polyethylene terephthalate by polycondensation in the solid phase wherein granulated, dried polyethylene terephthalate, having an intrinsic viscosity of at least 0.15, is first crystallized and is thereafter subjected to solid state polycondensation.
    Type: Grant
    Filed: April 15, 1976
    Date of Patent: December 20, 1977
    Assignee: Zimmer Aktiengesellschaft
    Inventors: Hans Joachim Rothe, Helmut Heinze, Brian D. Whitehead, Gunther Priepke