Bayer Aktiengesellschaft

Dieter Rempel

Rudolf Binsack

Christian Lindner

Karl-Heinz Ott

Dieter Neuray

Werner Nouvertne

Karl-Heinz Kohler

Hans-Josef Buysch

Peter Bier

Volker Serini

Leo Morbitzer

Norbert Schon

Peter R Muller

Gert Humme

Wolfgang Richter

Helmut Korber

Hans-Georg Gehrke

Rudolph Binsack

Gunter B Weber

Sivara Krishnai

Polyalkylene terephthalates which contain small quantities of aliphatic polycarbonate show improved fracture behavior, without a significant adverse effect on the strength and the flowability in the melt. Moreover, the compositions show improved behavior in hot-air ageing.

Impact-resistant thermoplastic polyester compositions of low melt

Polyalkylene terephthalates which contain a fluorinated polyolefin in addition to a polymer having a glass transition temperature of less than -30.degree. C., are very tough, exhibit good stability to thermal shaping and hardness, and have a high modulus of elasticity and improved stress/strain behavior.

Thermoplastic moulding compositions based on polyalkylene terephthalate

The present invention relates to thermoplastic moulding compositions, which have improved impact strength at low temperature, comprising thermoplastic polyesters, in particular polyalkylene terephthalates, and grafted, partially or highly cross-linked diene rubbers and/or acrylate rubbers having a bimodal rubber particle size distribution.

Thermoplastic polyester moulding compositions which have good impact

Moulding compositions of polycarbonate, polyalkylene terephthalate and, optionally, polymer having a glass transition temperature below -20.degree. C. may be processed to form particularly low-distortion mouldings when the polycarbonate consists at least partly of o,o,o',o'-tetramethyl-besphenol-polycarbonate.

Thermoplastic moulding compositions based on polycarbonate, polyalkylene

Moulding compositions of aromatic polycarbonate, polyalkylene terephthalate and a certain graft copolymer which may be processed into mouldings characterized by high multiaxial impact strength, exhibit an increased Vicat B-temperature if they contain a low amount of an ethylene homo- or copolymer.

Thermoplastic moulding compositions of polycarbonate, polyalkylene

A graft polymer is obtained from a completely broken latex of an acrylate rubber which is suspended in water and from copolymerisable monomers, in the absence of a suspending agent, which graft polymer may be distributed in thermoplastic polyesters to form particles having a relatively small average diameter.

Ageing-resistant, processing-stable, high strength mixtures based on

Graft copolymers having a diene rubber core surrounded by at least two different shells improve the impact strength under multi-axial stress of thermoplastic polyester moulding compositions.

Thermoplastic polyester moulding compositions having improved toughness

Grafted polyacrylates having a specific composition improve the impact strength under multi-axial stress of thermoplastic polyesters.

The toughness of polybutylene terephthalate can be considerably improved by the addition of an ABS-graft copolymer having a relatively high content of graft base and a closely defined particle size; the typical properties of polybutylene terephthalate, such as its high dimensional heat stability, hardness and rigidity, are not substantially reduced. The products show an excellent multiaxial impact strength.

High-impact polybutylene terephthalate

The toughness of thermoplastic polyesters can essentially be improved by addition of a new type of graft polymers which contain one grafting site for about 400 to 2000 carbon atoms, the average molecular weight M.sub.w of the graft branches being from 2000 to 40,000.

Thermoplastic polyester moulding compositions with good toughness

Polyethylene terephthalate copolymers comprising (I) blocksegments having a glass transition temperature below 0.degree. C. and (II) polyethylene terephthalate segments modified with certain diols having 3 to 10 carbon atoms, have an excellent rate of crystallization and necessitate mould temperatures of below 100.degree. C.

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Leverkusen, Germany

Dieter Rempel