Patents Assigned to Inventa-Fischer GmbH & Co. KG
  • Tower reactor and use thereof for the continuous production of high molecular weight polyesters
    Publication number: 20070116615
    Abstract: The invention relates to a tower reactor and the use thereof for producing high-molecular weight polyesters, such as e.g. polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polynaphthalene terephthalate (PEN), polytrimethylene terephthalate (PTT) and/or polyesters of other dicarboxylic acids and diols including copolymers thereof. It thereby concerns a single-stage tower reactor.
    Type: Application
    Filed: October 29, 2004
    Publication date: May 24, 2007
    Applicant: UHDE INVENTA-FISCHER GMBH & CO. KG
    Inventors: Eike Schulz Van Endert, Christian Atlas
  • Method for the continuous production of high-molecular polyester and device for carrying out the method
    Patent number: 7115701
    Abstract: The invention relates to a method for producing high-molecular polyester such as polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polynaphthalene terephthalate (PEN), polytrimethylene terephthalate (PTT) and/or polyester of other dicarboxylic acids and diols, including the copolymers of the same. The invention also relates to a device for carrying out said method, the device being a single-stage tower reactor by which means a method involving only two reactors is carried out for the entire process.
    Type: Grant
    Filed: November 11, 2002
    Date of Patent: October 3, 2006
    Assignee: Inventa-Fischer GmbH & Co. KG
    Inventors: Eike Schultz Van Endert, Rainer Hagen, Thomas Hille, Christian Atlas, Ulrich Thiele
  • Method for producing polylactic acid and corresponding device
    Patent number: 6875839
    Abstract: The invention relates to a method for producing polylactic acid, comprising the steps of obtaining lactic acid from starchy agricultural products by fermentation, ultrapurification of the lactic acid by ultrafiltration, nanofiltration and/or electrodialysis, concentration of the lactic acid and production of a prepolymer, cyclizing depolymerization to dilactide, purification of the dilactide, ring-opening polymerization of the dilactide and demonomerization of the polylactide.
    Type: Grant
    Filed: April 19, 2001
    Date of Patent: April 5, 2005
    Assignee: Inventa-Fischer GmbH & Co. KG
    Inventors: Lüder Gerking, Rainer Hagen, Klaus Richter, Frank Idler, Winfried Reimann, Bernd Hanzsch
  • Method for producing polyesters with a reduced content of free acetaldehyde
    Patent number: 6559271
    Abstract: The invention relates to a method for producing polyesters with a reduced content of free acetaldehyde from terephthalic acid and ethylene glycol via a catalyzed polycondensation in the melt and also the use of this method. The method is based thereby on the usage of highly active polycondensation catalysts, on the deactivation of these catalysts by the addition of phosphorous-containing inhibitors and the addition of acetaldehyde-bonding substances. The entire polycondensation is thereby implemented at temperatures beneath 280° C.
    Type: Grant
    Filed: September 13, 2001
    Date of Patent: May 6, 2003
    Assignee: Inventa-Fischer GmbH & Co. KG
    Inventors: Eckehart Schaaf, Gerald Rafler, Rainer Hagen