Bayer Aktiengesellschaft

Hans Hespe

Carl Heynemann

Dieter Freitag

Ludwig Bottenbruch

Carlhans Suling

Rudolf Binsack

Bruno Bomer

Joachim Konig

Alfred Eitel

Wilhelm Goyert

Georg Niederdellmann

Hans Wagner

Ernst Meisert

Harald Medem

Raimund Weber

A homopolymer or copolymer which contains, as a monomer unit, at least one styrene of the formula ##STR1## in which R.sup.1, R.sup.2 and R.sup.3 independently of one another denote hydrogen, fluorine or partly or completely fluorinated alkyl or alkoxy and

Lens of a homo- or copolymer of a fluorine containing styrene polymer

The present invention relates to an improved continuous process for the preparation of polyurethane elastomers which are distinguished from the products produced by known processes by increased elasticity, reduced shrinkage, higher rigidity (limit bending stress), improved cold notched bar impact resistance and good thermal stability.

Process for the preparation of polyurethane elastomers in which at least

Thermoplastic aromatic polyesters comprising cocondensed bisphenol residues generally have a refractive index n.sub.d of from 1.60 to 1.66, an Abbe coefficient v.sub.d of from 27 to 21 and a color triplet of about 5.1, 0.1, O and are excellent starting materials for the production of optical components, particularly high quality lenses for still and cine cameras.

Optical components consisting of aromatic polyesters molded in the form

The heat distortion resistance and the molecular weight of polypropylene terephthalate and polybentylene terephthalate can be increased by cocondensing up to 10 mol-% of aliphatic diols containing 5 to 10 carbon atoms or of cycloaliphatic diols containing 8 to 12 carbon atoms.

Thermoplastic copolyesters and a process for their production

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Leverkusen, Germany

Hans Hespe