Lurgi Zimmer Gmbh

Zimmer Aktiengesellschaft

Other

Technip Zimmer Gmbh

Brigitta Otto

Holger Bachmann

Eckhard Seidel

Stefan Deiss

Hans Reitz

Rainer Linke

Roland Schäfer

Ulrich Thiele

Klaus Kirsten

Karl-Heinz Heldmann

Ludwig Hölting

Roland Schafer

Jens Schiebisch

Xiaogang Guo

Karl Ulrich Thiele

Gerd Alsheimer

Thomas Steinbrecher

Oliver Schmidt

Hoger Bachmann

Nazim S Hally

Bernd Müller

A method is disclosed for producing polymers with a neutral color tone, wherein a blue and red dye are added before entry into the last polyreaction stage, wherein adjustment of a neutral color tone of the polymer, using a total dye concentration in the polymer of no more than 3 ppm and a proportion of the blue dye in the resulting dye mixture of at least 50% by weight, occurs through independent adjustment of a and b color values in the Lab color space by determination of a and b color values of the polymer without addition of dyes, establishment of the total dye concentration depending on the b-value shift to be achieved, establishment of the required mixture ratio of the colors red and blue depending on the a-value shift to be achieved, and metering of the established content of dye mixture into the reaction mixture.

Method for producing polymers with a neutral color tone

The present invention relates to a catalytically active composition that can be used for the production of polyesters. According to the invention, good polyester products can be obtained in this way without having to use antimony components.

Catalyst for the production of polyester, use of the catalyst for the production of polyester, and polyester obtained by the use of the catalyst

The invention relates to a continuous method for the direct production of multilayer mold bodies from a highly condensed polyester melt.

Method for the direct and continuous manufacture of polyester moulded bodies with low acetaldehyde content

The present invention relates to mixtures comprising at least one polyester precursor and at least one alkali- and/or alkaline-earth metal salt where the mixture contains at least one phosphonic acid ester of the Formula (I)(RO)OC&#x2014;R'&#x2014;PO(OR)&#x2003;&#x2003;(I)where independently R represents a group with 1 to 60 carbon atoms and R&#x2032; represents a group with 1 to 20 carbon atoms. Furthermore, the present invention relates to the polyester compositions which can be produced from the mixtures and to the resulting polyester films.

Mixture, polyester composition, film and procedures for their manufacture

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 invention relates to a composition suitable for catalysis in a process for the manufacture of polyester containing as Component I a carrier substance on which catalytically effective metal compounds are adsorbed and as Component II a phosphonic acid compound.

Composition and process for manufacturing polyester

The present invention relates to a method for producing solid-state polycondensed polyesters by using crystallization with or without subsequent solid-state polycondensation for producing bottles, sheets, films, and high-tenacity technical filaments.

Method and apparatus for producing solid-state polycondensed polyesters

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

The production of linear polyester by the interchange of ester radicals or esterification and polycondensation of multivalent alcohols with multivalent carboxylic acids takes place by means of catalysts. In order that the catalyst features the lowest possible content of catalytically active metal compound, the carrier substance that forms the heterogeneous phase comprises particles of the finest grain and of porous structure and features a surface of great inner, reactive and/or coordinated centers, whereby a catalytically active metal compound is adsorbed in the pores.

Catalyst and method for its production and use

The present invention comprises a method of producing polyester transesterification of at least a dicarboxylic acid dialkyl ester or esterification of at least a dicarboxylic acid with at least a diol and subsequent precondensation and polycondensation in the presence of the usual catalysts, whereby the polycondensation and optionally the esterification take place in the presence of an additional carbon containing co-catalyst, preferably activated charcoal with a specific surface area of more than 500 m /g and an average grain size of less than 2 &mgr;m.

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Milow, Germany

Brigitta Otto