Covestro Deutschland Ag

Covestro Intellectual Property Gmbh & Co. Kg

Jan Heijl

Pieter Ooms

Erik Sluyts

Alexander Meyer

Niklas Meine

Annabelle Bertin

Andreas Seidel

Christoph Gürtler

Andreas Bulan

Rainer Weber

Helmut Werner Heuer

Walter Leitner

Thomas Ernst Müller

Burkhard Köhler

Siegfried R Waldvogel

Rolf Bachmann

Johan Vanden Eynde

Hermann Kauth

Volker Michele

Jens Langanke

Thomas Pfingst

Franky Bruynseels

Frank Bruynseels

Marina Reithmeier

Volker Altstädt

Natalie Bittner

Stephan Laue

Maarten De Bock

Tobias Bubmann

Antonio Ortiz

Ivan Sluijs

Felix Cock

Somchai Kanjanasantisak

Alexandra Große Böwing

Nicolai Kolb

Xiaoxin Yao

Marten Voelker

Josef Bartholomei

Vinh Trieu

Thomas Ernst MÜLLER

Alexandra Grosse BÖWING

The present invention relates to a process for preparing a polyester carbonate on the basis of aliphatic diacids and aliphatic diols and to the polyester carbonate prepared according to the process and to a moulding mass and moulding body containing the polyester carbonate. The process according to the invention is a direct synthesis in which all structural elements forming the subsequent polyester carbonate are already present as monomers in the first process step and in which two catalysts are used.

Polyester carbonates from aliphatic diacids and aliphatic diols, and process for the production thereof

The present invention relates to a composition for producing a thermoplastic moulding compound containing: A) an aromatic polycarbonate and/or aromatic polyester carbonate containing carboxy groups, wherein the polycarbonate has an acid value ranging from 0.5 to 10 mg of potassium hydroxide/g, determined in dichloromethane/ethanol as the solvent by means of potentiometric titration in accordance with DIN EN ISO 2114, method A in version 2002-06 with ethanolic potassium hydroxide solution at ambient temperature, and a weight-average molecular mass (M), determined by gel permeation chromatography at ambient temperature in dichloromethane as the solvent using a BPA polycarbonate standard, ranging from 15,000 to 40,000 g/mol, and B) a polymethyl methacrylate copolymer containing structural units derived from glycidyl methacrylate, wherein the copolymer has an epoxide equivalent weight, determined in dichloromethane as the solvent at ambient temperature in accordance with DIN EN 1877-1 in version 2000-12, of 0.05 to 3 wt % and a weight-average molecular mass (M), determined by gel permeation chromatography at ambient temperature in tetrahydrofuran as the solvent using a polystyrene standard, of 20,000 to 200,000 g/mol, wherein the weight ratio of component A and component B ranges from 95:5 to 35:65, and a method for producing a moulding compound from the composition, a moulding compound obtained according to the method, the use of the moulding compound to produce moulds, the moulds per se and a method for producing the moulds.

Composition and method for producing a transparent thermoplastic polycarbonate/polymethyl methacrylate moulding compound

The present invention relates to a method for preparing a polyester carbonate starting from cycloaliphatic diacids and aliphatic diols and to the polyester carbonate prepared by the method. The method according to the invention is a direct synthesis in which all the structural elements that form the subsequent polyester carbonate are already present as monomers in the first step of the method.

Polyester carbonates from cycloaliphatic diacids and aliphatic diols, and process for preparing same

A process for preparing polycarbonate by the phase interface process in the presence of at least one catalyst, wherein immediately after the optionally first addition of the at least one catalyst, from 0.01 to 20 J/kg of mixing energy is introduced into the system comprising the at least one catalyst within a time of from 2 to 1200 s. A mixture, an organic phase, and a process for distributing at least one catalyst in a system comprising an organic phase and an aqueous phase are also disclosed herein.

Method for producing polycarbonate

The invention relates to a method for producing a specific hydroxyl compound by decarboxylating a specific carboxylic acid compound or a salt of said carboxylic acid compound in the absence of a catalyst and to a method for producing a bisphenol.

Method for producing a hydroxy compound by decarboxylation in the absence of a catalyst

The invention relates to a process for preparing a specific hydroxy compound by means of decarboxylation of a specific carboxylic acid compound or a salt of said carboxylic acid compound, to a method for preparing a diaryl carbonate, a bisphenol or a polycarbonate, a diaryl carbonate or bisphenol, a polycarbonate, and to a method for adjusting the isotope ratio of C14 to C12 in a polymer. A specific solvent is used during decarboxylation.

Process for preparing a hydroxy compound by means of decarboxylation

The present invention relates to a process for producing a polycarbonate from a diphenol or two or more different diphenols and a carbonyl halide by the interfacial process. It is a feature of the process according to the invention that it is carried out on the basis of a chlorohydrocarbon or a mixture of a mixture of two or more chlorohydrocarbons using an organic solvent. An organic solvent is also provided.

Process for producing a polycarbonate using an organic solvent based on chlorohydrocarbons

The present invention relates to a melt transesterification process for the production of (co)polycarbonates from diaryl carbonates and cycloalkylidene diphenols, which process comprises the addition of a monohydroxyaryl compound in an amount of 5.0 to 20.0 wt.-%, based on the total mass of the reaction mixture. The invention further relates to a (co)polycarbonate obtained by the process.

Preparation of highly heat-resistant (co)polycarbonates by the transesterification method

The present invention relates to a process for preparing aromatic polycarbonates, comprising the step of reacting bisphenols with dithiocarbonates or selenium analogs thereof in the presence of a catalyst. It further relates to the use of dithiocarbonates or selenium analogs thereof as transesterifying reagents for the preparation of polycarbonates.

Process for preparing polycarbonates by transesterifying dithiocarbonates or selenium analogues thereof with bisphenols

The invention relates to an efficient continuous method for producing polycarbonates according to the phase interface method.

Method for producing polycarbonate according to the phase interface method

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Lokeren, Belgium

Jan Heijl