Basf Aktiengesellschaft

Basf Se Corporation

Kolon Plastics, Inc.

Thomas Heitz

Martin Jochen Klatt

JongMoon Kim

Marvin Kramp

Jin-Sang Choi

Achim Stammer

Brigitte Gareiss

Herbert Fisch

Joerg Erbes

Manfred Heilig

Peter Braune

Ralf Neuhaus

Johann Diedrich Brand

In-Gi Cho

HyunSoo Chang

In Gi Cho

Martin Weber

Gunter Pipper

Sylke Haremza

Motonori Yamamoto

Bernd Leutner

Walter Heitz

Christoph Plachetta

Jurgen Hofmann

Josef Wunsch

Jürgen Demeter

Stefan Grutke

Andreas Greiner

Eckhard Neufeld

Michael Nam

Manfred Heym

Helmut Heel

Alexander Gluck

Karl Hölemann

Klaus Muhlbach

Wilfried Vogel

Jan-Martin Löning

Manfred Heckmann

Erich Pellkofer

Sang-Yup Lee

Georg Schneider

Barbel Arnold-Mauer

Petra Wieland

Christoph Sachsenweger

Ralf Richter

Alexander Gl Uck

Minlu Zhang

Joong Kyu Chung

Jong-Moon Kim

The present invention relates to a method for the production of a colored polyoxymethylene copolymer by mixing a raw polyoxymethylene copolymer in particulate form, comprising 2 to 30% by weight of unreacted residual monomers, with a coloring agent in particulate form, in a degassing apparatus. In addition, the present invention relates to the colored polyoxymethylene copolymer obtainable by the process and the use of the colored polyoxymethylene copolymer for the production of molding parts.

Method for the production of a colored polyoxymethylene copolymer

The present invention relates to a method for the combined production of at least two target products selected from the group consisting of (T), (T) and (T), wherein (T) is a terephthalate polyester, (T) is a copolyester on the basis of terephthalic acid, at least one aliphatic 1,ω-dicarboxylic acid and at least one aliphatic 1,ω-diol, and (T) is a copolyester on the basis of terephthalic acid, polytetramethylene glycoland at least one aliphatic 1,ω-diol.

Method for the combined production of at least two target products

The invention relates to a method for the combined processing of at least two polymer melts selected from the group consisting of (M), (M) and (M), wherein (M) is a polymer melt comprising a terephthalate polyester (A), (M) is a polymer melt comprising a copolyester (A) on the basis of terephthalic acid, at least one aliphatic, ω-dicarboxylic acid and at least one aliphatic 1,ω-diol, and (M) is a polymer melt 0 comprising a copolyester (A) on the basis of terephthalic acid, at least one polytetramethylene glycol and at least one aliphatic 1,ω-diol. The method comprises the alternating processing of the at least two polymer melts into at least one product selected from the group consisting of pellets (P), fibers (P), expanded particles (P), preforms (P) and articles (P).

Method for the combined processing of at least two polymer melts

A process for making an oxymethylene polymer comprising polymerizing at least one compound capable of forming &#x2014;CHO&#x2014; repeat units (monomer) in the presence of at least one ester of the general formula I (ester): R&#x2014;CO&#x2014;O&#x2014;R(I) wherein Rcan be hydrogen, wherein Rand Rare independently of each other linear or branched Cto Calkyl Cto Ccycloalkyl &#x2014;[R-0-]Rwherein Ris a linear or branched Cto Calkylen and Ris a linear of branched Cto Calkyl and n is an integer of from 1 to 5. and in the presence of at least one Lewis acid.

Process for making an oxymethylene polymer

The present invention relates to a process for preparing dioxolane by reacting ethylene glycol with an aqueous solution of formaldehyde in the presence of an acid catalyst. The raw product comprising water, dioxolane and methanol is fed to a phase separation unit () wherein an organic extracting agent is present. An organic fraction stream from the phase separation unit is transferred to an upper part of a purification column () from which dioxolane is withdrawn as a bottom product while the distillate stream of the purification column is recycled to the phase separation unit. An aqueous fraction stream from the phase separation unit is transferred to a waste water column (), withdrawing a waste water stream from the bottom of the waste water column, recycling a distillate stream () from the waste water column to the phase separation unit, and withdrawing a side stream () containing methanol from a stage below the feed stage of the waste water column.

Process for preparing dioxolane

The present invention relates to a process for preparing dioxolane by reacting ethylene glycol with an aqueous solution of formaldehyde in the presence of an acid catalyst. The raw product comprising water, dioxolane and methanol is fed to a phase separation unit () wherein an organic extracting agent is present. An organic fraction stream from the phase separation unit is transferred to an upper part of a purification column () from which dioxolane is withdrawn as a bottom product while the distillate stream of the purification column is recycled to the phase separation unit. An aqueous fraction stream from the phase separation unit is transferred to a waste water column (), withdrawing a waste water stream from the bottom of the waste water column, withdrawing a side stream () from a stage between the feed stage and the reflux stage of the waste water column and recycling this stream () to the phase separation unit, and withdrawing a distillate stream () containing methanol from the waste water column.

The present invention relates to a process for energy recovery in a process for the preparation of 1,3,5-trioxane.

Energy recovery in a method for preparing 1,3,5-trioxane

Process for purifying and cooling a gas stream comprising a dialkyl ester A) of an aromatic dicarboxylic acid, which comprises treating the gas stream with an aliphatic dihydroxy compound B) at a temperature less than/equal to the melting point of the dialkyl ester A) in a 1st stage and treating the gas stream with an aliphatic dihydroxy compound B) at above the melting point of the dihydroxy compound B) in at least one 2nd stage.

Cooling and purification of gas streams

Method for the continuous production of polybutyleneterephthalate from terephthalic acid and butanediol

The invention relates to a method for the continuous production of polybutylene terephthalate from terephthal acid and 1,4-butane diole, comprising the following stages: a) direct esterification of terephthal acid with 1,4-butane diole in a reactor cascade of at least two reactors b) pre-condensation of the esterification product obtained in stage a), c) polycondensation of the pre-condensate obtained in stage b), whereby the temperature of the reactor cascade in stage a) is progressively decreased during its operation.

Method for the continuous production of polybutylene terephthalate from terephthal acid and butane diole

Flame-proof moulding compounds

Flame-proof thermoplastic moulding materials

A continuous process for the preparation of polyalkylene arylates A) containing lubricants and nucleating agents, in which an aromatic dicarboxylic acid or esters or ester-forming derivatives thereof are esterified or transesterified with a molar excess of an aliphatic dihydroxy compound and the (trans)esterification product obtained is polycondensed, wherein when at least 80% of the desired viscosity number has been reached, lubricants B) and nucleating agents C) are added to the polymer melt and the melt is optionally post-condensed and then discharged, cooled and granulated.

Method for producing polyalkylene arylates

The invention relates to the use of thermoplastic polyester molding compounds, containing A) 80 to 100 wt. % of a polyalkylene arylate, especially polybutyleneterephthalate, with a half-width of crystallization heat releases of &lE;5&deg; C. and B) 0 to 20 wt. % of other additives, the weight percentages of constituents A) and B) adding up to 100%, for producing molded bodies by blow-molding, profile extrusion and/or pipe extrusion. A preferred use for the inventive molding compounds is the production of light guide sheathing. The invention also relates to a 3-stage method for producing the polyesters as follows: a) esterification or re-esterification of an aromatic dicarboxylic acid or its derivative and a glycol; b) precondensation; and c) polycondensation to a viscosity number of at least 158 ml/g. The reaction is carried out in at least 2 temperature zones in stages a) and b).

Use of high-molecular polyester moulding materials

A process for preparing polyalkylene arylates by esterifying or transesterifying an aromatic dicarboxylic acid or its esters or ester-forming derivatives with a molar excess of an aliphatic dihydroxy compound and polycondensing the resultant esterification or transesterification product comprises polycondensing the prepolymer with a viscosity number (VN) of <30 ml/g in the presence of an oxygen-containing gas.

Polyalkylene arylates containing a high proportion of carboxyl end groups

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Dannstadt-Schauernheim, Germany

Thomas Heitz