| Uhde Inventa-Fischer GmbH Patent applications |
| Patent application number | Title | Published |
|---|
| 20120088898 | Catalyst mixture and method for the production of polyesters with high viscosity - Provided are a catalyst mixture and also a method for the production of a polyester melt with high viscosity, the granulate obtained therefrom having an intrinsic viscosity of >0.70 dl/g and an L* colour >70 and the b* colour being between −5 and +5. The catalysts being used during the production are not based on heavy metals but on titanium compounds. Also no components of catalysts based on heavy metal are added. The granulate can be processed further in any way, e.g. to form bottles, containers, films, foils or fibres. | 04-12-2012 |
| 20120077951 | METHOD FOR INCREASING THE MOLECULAR WEIGHT OF A POLYESTER GRANULATE BY USING ITS RESIDUAL HEAT - The present invention relates to increasing the molecular weight during a thermal treatment of polyester in combination with a latent heat granulation. With the newly-developed method, an SSP (Solid State Postcondensation) can be directly combined with an underwater granulation. The method differs from a conventional solid state postcondensation by an increase in the molecular weight being possible without additional heat input and hence only by using the residual heat and the crystallisation heat present. A characterising element is improved water separation and dehumidification during the granulation. Only in this way is an increase in viscosity possible even with a small granulate of an average particle weight less than 20 mg. | 03-29-2012 |
| 20110288312 | METHOD FOR STORING AND TRANSPORTING CYCLIC DIESTERS - The present invention relates to a method for storing and/or transporting intramolecular cyclic esters (lactones), in particular lactide. | 11-24-2011 |
| 20100252076 | CONDENSATION AND WASHING DEVICE, POLYMERISATION DEVICE AND METHOD FOR CLEANING PROCESS STEAM DURING THE PRODUCTION OF THE POLYLACTIDE - The present invention relates to a condensation and washing device with which in particular the process vapours which occur during the production of polylactide can be processed and cleaned. Furthermore, the present invention relates to a polymerisation device for the production of polylactide and also to a method for processing process vapours which occur during the production of polylactide; possibilities for use of both the condensation and washing devices and of the method are likewise mentioned. | 10-07-2010 |
| 20100249364 | CLEANING DEVICE FOR SEPARATING DILACTIDE FROM MIXTURES, POLYMERISATION DEVICE, METHOD FOR SEPARATING DILACTIDE FROM MIXTURES AND USE THEREOF - The present invention relates to a device for separating a biodegradable, intermolecular cyclic diester of an alpha-hydroxycarboxylic acid from material mixtures which contain in addition the alpha-hydroxycarboxylic acid of the diester corresponding thereto. In particular, the diester is thereby dilactide and the acid lactic acid. Furthermore, the present invention relates to a method for separating dilactide from material mixtures, which is based on a modified, distillative method. In addition, the present invention describes a polymerisation device, in particular for preparing polylactide. Likewise, purposes of use of both the devices and of the method are indicated. | 09-30-2010 |
