Lurgi Zimmer Gmbh

Shell Oil Comapny

Zimmer Aktiengesellschaft

Technip Zimmer Gmbh

T.en Zimmer Gmbh

Holger Bachmann

Brigitta Otto

Eckhard Seidel

Rainer Linke

Roland Schäfer

Donald R Kelsey

Robert Lawrence Blackbourn

Stefan Deiss

Michael Reisen

Hans Reitz

Klaus Kirsten

Ludwig Hölting

Cecilia Zuqi Tse

Reza Sarbandi

Roland Schafer

Bernd Müller

A process for reducing the amount of hydroxyl-end-groups of a polyester, wherein the polyester is prepared from at least one dicarboxylic acid and at least one dihydroxy alcohol, and at least one additive selected from the group consisting of carboxylic acid anhydride and mono-isocyanate, and wherein the additive is added during a step of prepolycondensation and/or during a step of polycondensation and/or after a step of polycondensation.

Process for preparing polyesters by using an additive

The invention relates to a continuous or discontinuous method for the production of highly condensed polyesters in the solid state, comprising a crystallization of a polyester material, wherein the crystallization is carried out in the presence of a gas with a dew point of (less than or equal to) &#x2266;approximately &#x2212;10&#xb0; C. The invention also relates to a method for the production of polyester formed bodies using the polyester material obtained for the production of bottles, films and high strength threads.

Method for producing highly condensed solid-phase polyesters

A method of making shaped articles from highly condensed polyester melt and especially preforms for the blow molding of food and especially beverage containers. A melt is continuously withdrawn from the polycondensation reactor and is fed to the shape-imparting units, especially a multiplicity of injection-molding machines without solidification between the final reactor and the injection molders and without degassing between the final reactor and the injection molding machines.

Method for the direct and continuous production of hollow articles from a polymer melt

The invention relates to a method for producing a granulate with a low acetaldehyde content and improved processing properties from a high-viscosity polyester melt, wherein the polyester melt strand is fragmented under water at the highest possible temperature, the accompanying water is separated from the granulate with the least possible cooling of the granulate, the low-water granulate obtained in this way is passed after removal of the water directly into a dealdehydisation container and the granulate in the dealdehydisation container is treated with a flow of rinsing air, plus a device for carrying out this method.

Method and device to reduce the acetaldehyde content of polyester granulate

The present invention provides a process of reducing acrolein by product from polytrimethylene terephthalate using selected phosphorus compounds to contact the polytrimethylene terephthalate or reactants in the process of producing polytrimethylene terephthalate. The selected phosphorus compounds are retained in the polytrimethylene terephthalate. The present invention also provides polytrimethylene terephthalate compositions containing amounts of phosphorus compounds.

Polytrimethylene terephthalate having a low level of acrolein and a process for producing the same

Latent heat crystallized polyesters and copolyesters of a degree of crystallization greater than 38% and made by a process in which, without prior additive admixtures and without further cooling, the granulate is fed directly from the latent heat crystallization into a solid phase polycondensation reactor and condensed to a higher viscosity and subjected to acetaldehyde reduction. Alternatively without additive admixtures the granulate is subjected to dealdehydization and then worked up into bottles.

Method of producing highly condensed polyester granulate

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Weiterstadt, Germany

Holger Bachmann