Bayer Aktiengesellschaft

Other

Peter Tacke

Dieter Freitag

Dieter Neuray

Ulrich R Grigo

Werner Nouvertne

Dietrich Michael

Ludwig Bottenbruch

Karsten-Josef Idel

Friedrich Fahnler

Helmut Korber

Karl-Heinz Ott

Klaus Reinking

Uwe Westeppe

Wolfgang Alewelt

Frieder Heydenreich

Klaus G Wilms

Franz-Josef Gielen

Hans-Josef Buysch

Christian Lindner

Rolf Dhein

Manfred Schmidt

Hans-Jurgen Kress

Claus H Wulff

Peter Woditsch

Werner Nielinger

Josef Merten

Bernd Quiring

Frank Gerald Kleiner

Ralf Pakull

Gert Humme

Peter Panek

Kurt Schneider

Gerhard Henes

Wolfgang Ritter

Rolf V Meyer

Ulrich Grogp

Steffen Kuhlig

A three-step process for the production of solventless polycarbonate is disclosed. Accordingly, a mixture of two different oligocarbonates each prepared by the interfacial method, is prepared in the first process step. In a second step, the mixture is crystallized. The third step entails polycondensation. In an additional embodiment of the invention the first step uses a mixture of one oligocarbonate with a suitable monomer.

Process for the production of solventless polycarbonate

The invention relates to ternary thermoplastic mixtures of polycarbonates, polyurethanes and graft polymers and, optionally, standard additives and to processes for the production of these mixtures.

Ternary thermoplastic mixtures

Fire-retardant polycarbonates, polyester carbonates and polyesters based on dihydroxydiphenyl cycloalkanes ##STR1## in which R.sup.1 and R.sup.2 independently of one another represent hydrogen, halogen, preferably chlorine or bromine, C.sub.1 -C.sub.8 alkyl, C.sub.5 -C.sub.6 cycloalkyl, C.sub.6 -C.sub.10 aryl, preferably phenyl and C.sub.7 -C.sub.12 aralkyl, preferably phenyl-C.sub.1 -C.sub.4 -alkyl, more especially benzyl,

Fire-retardant polycarbonates and polyesters

Aromatic polyesters are prepared by the transesterification of aromatic dicarboxylic acid dialkyl esters with diester derivatives of divalent phenols at temperatures of about 260.degree. to 350.degree. C. with removal of the resulting monocarboxylic acid alkyl ester from the reaction mixture.

Process for the preparation of aromatic polyesters

This invention relates to mixtures of thermoplastic aromatic poly(ester)carbonates with thermoplastic polyurethanes containing special graft polymers and, optionally, suitable additives, to a process for their production and to the use of the mixtures according to the invention for the production of moldings, particularly by injection molding or extrusion.

Mixtures of thermoplastic poly(ester) carbonates with thermoplastic

Aromatic polyesters based on diphenols and iso- and/or terephthalic acid are produced by transesterification of esters of the diphenols with the aromatic dicarboxylic acids in the melt by first reacting the aromatic dicarboxylic acids with a stoichiometric excess of the diphenol esters to form oligomers and then condensing the resulting oligomers to the aromatic polyesters with elimination and removal by distillation of diphenol ester.

Process for the production of aromatic polyesters

The preparation of aromatic polyesters based on diphenols and iso- and terephthalic acid is carried out by solventfree transesterification of esters of the diphenols with the aromatic dicarboxylic acids, the esters of the diphenols being initially reacted with teriphthalic acid alone and subsequently reacted with isophthalic acid after at least 80% of the terephthalic acid has undergone reaction.

The present invention provides moulding compositions consisting of polyphenylene oxide/polycarbonate block condensates, graft polymers and, where appropriate, co-polymers. These moulding compositions can contain further suitable additives. The present invention also provides a process for preparing the moulding compositions according to the invention.

Thermoplastic moulding compositions based on polyphenylene

The present invention relates to thermoplastic moulding materials of (A) thermoplastic polycarbonates mixed with (B) thermoplastic polyalkylene terephthalates and, if appropriate, with (C) elastomeric polymers, which are characterized in that they contain (D) a polycarbonate-polyphenylene oxide block co-condensate.

Thermoplastic moulding materials

This invention relates to the use of polyphenylene oxides corresponding to the following general formula: ##STR1## for the production of aromatic block polyether-poly(ester) carbonates by the interfacial process and also to the block polyether-poly(ester) carbonates obtainable by the process.

Use of certain polyphenylene oxides for the production of aromatic block

The invention relates to a process for the preparation of aromatic polyester-carbonates wherein, in a first stage, aromatic oligo-esters or oligo-ester-carbonates having hydroxyl end groups are prepared from diaryl esters of aromatic dicarboxylic acids (or their starting materials) and diphenols and, optionally, a diaryl carbonate, by trans-esterification in the melt, and in a second stage these oligo-esters or oligo-ester-carbonates are condensed with phosgene by the phase boundary process to give the polyester-carbonate.

Two stage process for the production of aromatic polyester-carbonate

Bis-chlorocarbonic acid esters of diphenols react with aromatic dicarboxylic acids in the melt or in high-boiling, inert organic solvents, even in the absence of bases, such as tertiary amines for example, to form polyester carbonates.

Process for the production of aromatic polyester carbonates in the

Aromatic polyester carbonates may be produced by the interphase process by reacting salts of aromatic dicarboxylic acids with excess bis-chlorocarbonic esters of diphenol at a pH value of from 6 to 8.5 and by subsequently polycondensing the product at a pH value of from 9 to 14.

Interphase process for the production of fully aromatic polyester

A mixture comprising 1. from 70 to 99% by weight of a predominantly aromatic polycarbonate; and 2. from 30 to 1% by weight of a polyolefin graft polymer of (a) 70 to 95% by weight of a graft base consisting of a homopolymer of aliphatic and/or aromatic monoolefins or of a copolymer of these olefins, and up to 50% by weight of other monoolefinically unsaturated, radially polymerizable compounds and/or up to 5% by weight of diolefins, and (b) 5 to 30% by weight of at least one graft-polymerizable vinyl compound, the olefin graft polymers having been obtained by contacting a melt of the graft base (a) with oxygen or an oxygen-containing gas for at most 10 min. with intensive mixing under a pressure of from 1 to 150 bars and at a temperature of from 80.degree. C. to 300.degree. C., adding the vinyl compounds (b) to be grafted on immediately afterwards with intensive mixing in the absence of oxygen or oxygen-containing gas and removing the residual monomers after the graft polymerization reaction.

Polycarbonate-polyolefin moulding compositions

Small quantities of hydrogenated polybenzyls act as a perfect mould release agent for aromatic polyesters based on diphenols and iso- and/or terephthalic acids and do not appreciably impair the elastic strength characteristics, the dimensional stability under heat and the transparency.

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Krefeld, Germany

Peter Tacke