Zimmer Aktiengesellschaft

Lurgi Zimmer Aktiengesellschaft

Degussa Aktiengesellschaft

Heinz-Dieter Schumann

Ulrich Thiele

Dietmar Wandel

Alexander Klein

Joachim Cziollek

Fritz Wilhelm

Helmut Schwind

Klaus Dorn

Wolfgang Janas

Rudolf Kaempf

Peter Kempf

Copolyester fibers

The invention concerns a method of processing polymer blends based on polyester or polyamide with a draw-off speed of .gtoreq.1500 m/min to produce filaments with an elongation at break of .ltoreq.180%, where a second amorphous polymer is added to the polyester or polyamide in the amount of 0.05 to 5 wt % and the polymer is a copolymer composed of at least two of the following monomer units:

Process for the processing of polymer mixtures into filaments

The present invention is a pre-oriented, non-stretched polyester fiber spun with spooling speeds of at least 3,000 m/min., wherein the polyester is a copolymer comprised essentially of ethylene terephthalate units and up to 10 weight % of other dicarboxylic acids or other diols, and carboxy phosphonic acid units of the formula: ##STR1## wherein R is selected from C.sub.1-10 -alkylene, C.sub.1-10 -cycloalkylene or C.sub.6-10 -arylene, in a quantity corresponding to 30 to 500 ppm phosphorus, in relation to polyester. The invention also comprises a process for the production of this fiber.

Process of making poy polyester fiber

Process for the production of preoriented filaments from polyester-based polymer mixtures by spinning the polymer mixtures with a draw-off speed v of at least 2500 m/min, a second amorphous, thermoplastically processable copolymer having a glass transition temperature of more than 100.degree. C. being added to the polyester, wherein the ratio of the melt viscosity of the copolymer to the melt viscosity of the polyester is 1:1 to 10:1, in that the amount of copolymer added to the polyester is at least 0.05 wt. %, in that the maximum amount M of the copolymer added to the polyester depends on the draw-off speed v, and in that ##EQU1##

Process for processing polymer mixtures to filaments

The present invention comprises a process for the production of flame-resistant polyesters with at least 50 mol-% ethylene carboxylate units through esterification or ester interchange and co-polycondensation of at least one diol and a dicarboxylic acid or its dialkyl ester with a carboxyphosphinic acid, whereby the carboxyphosphinic acid, before being added to the co-polycondensation mixture, is dissolved in ethylene glycol of not more than 90.degree. C., and the acid number of this solution is standardized to 50 to 350 mg KOH/g of carboxyphosphinic acid by adding at least one basic alkali metal compound in the absence of oxygen, and said solution is added to the co-polycondensation mixture during the second half of the esterification or ester interchange reaction.

Process for the production of flame-resistant polyesters

The present invention is a pre-oriented, undrawn polyester fiber spun with spooling speeds of at least 3,000 m/min., wherein the polyester is a copolymer comprised essentially of ethylene terephthalate units and up to 10 weight % of other dicarboxylic acids or other diols, and carboxy phosphonic acid units of the formula: ##STR1## wherein R is selected from C.sub.1-10 -alkylene, C.sub.1-10 -cycloalkylene or C.sub.6-10 -arylene, in a quantity corresponding to 30 to 500 ppm phosphorus, in relation to polyester. The invention also comprises a process for the production of this fiber.

A process for the acceleration of the polycondensation of polyester made by the esterification of at least one dicarboxylic acid with at least one diol, precondensation, melt phase polycondensation, granulation, crystallization and solid phase polycondensation comprising the addition, prior to the precondensation reaction, of from about 30 to about 900 ppm phosphorus in relation to the polyester in the form of carboxy phosphonic acid of the formula: ##STR1## wherein, R is selected from the group consisting of C.sub.1-10 -alkylene, C.sub.1-10 -cycloalkylene, and C.sub.6-10 -arylene and R.sup.1, R.sup.2, and R.sup.3 are selected from the group consisting of hydrogen, C.sub.1-10 -alkyl, C.sub.1-10 -cycloalkyl, and C.sub.6-10 -aryl, provided that at least two of R.sup.1, R.sup.2, and R.sup.3 are hydrogen.

Process for the acceleration of the polycondensation of polyester

Process for direct production of shaped packaging material made of thermoplastic polyesters with no effect on the taste of foods packaged in them, where the diol component of the polyester consists of at least 70 wt % ethylene glycol, and the polyester is produced in the presence of the usual catalysts plus additional cobalt or cobalt and manganese compounds and phosphorus compounds. An inert gas is introduced into the polyester melt and distributed uniformly in the melt immediately after its discharge from the polycondensation reactor, 0.05 to 1.0 wt % of an amide compound with a low volatility is added to the polyester melt directly next to the gas inlet. Finally, the polyester melt is subjected to a vacuum degassing immediately before the shaping apparatus and the melt is sent directly to the shaping apparatus within a maximum of 30 minutes after its discharge from the reactor at a maximum temperature of 35.degree. C. above the crystallite melting point of the polyester.

Process for direct production of low acetaldehyde packaging material

A process for the reduction of the carboxyl end groups of linear polyester through reaction with alkylene carbonate in the melt phase in the presence of 40 to 160 ppm of allyltriphenyl phosphonium bromide, based on the weight of the polyester.

Process for the reduction of carboxyl-end groups of linear polyesters

Modified copolyethylene terephthalate, for processing by extrusion blow molding, containing units of isophthalic acid, diethylene glycol and pentaerythritol, antimony and phosphorus plus small amounts of red toner and a blue toner. Also a process for producing same by direct esterification, melt polycondensation and heat treatment in the solid phase.

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Maintal, Germany

Heinz-Dieter Schumann