Hoechst Aktiengesellschaft

Ticona Gmbh

Targor Gmbh

Basell Polyolefine Gmbh

Michael-Joachim Brekner

Frank Osan

Jurgen Rohrmann

Martin Antberg

Thomas Weller

Cynthia Bennett

Otto Herrmann-Schoenherr

Andreas Winter

Michael Aulbach

Hellmuth Deckers

Walter Spaleck

Frank Kuber

Oskar Nuyken

Bernd Bachmann

Arnold Schneller

Volker Fraaije

Freddy Helmer-Metzmann

Jochen Coutandin

Roland Kratzer

Dietmar Jungbauer

Ulrich Epple

Markus Oberhoff

Frank K&uuml;ber

Horst-Tore Land

Otto Herrmann-Schonherr

Roland Zenk

J&ouml;rg Schottek

Frank K Uber

Klaus Alberti

J Urgen Rohrmann

Otto Hermann-Schonherr

Christoph Weber

Hansotto Drotloff

Gerhard Maier

Egon Hellstern

Dazhong Yang

Annette Vollmar

Manfred Siemon

The present invention relates to a fiber which comprises at least one partly crystalline cycloolefin copolymer which can be prepared by polymerization of a symmetrical polycyclic olefin, an acyclic olefin and, if desired, a monocyclic olefin in the presence of a catalyst system comprising an aluminoxane and a metallocene compound of the formula

Fibers made of cycloolefin copolymers

Metallocene compound and polymerization catalyst comprising heterocyclic group

The present invention relates to a metallocene compound containing at least two metallocene fragments L&mdash;MX,&mdash;L which are different from one another and having the formula I

Multinuclear metallocene compound, a process for its preparation and its use as catalyst

Thermoplastic cycloolefin copolymers (COCs) having high tear strength and low optical attenuation, a process for their preparation, and their use as optical waveguides (optical fibers).

Cycloolefin copolymers having high tear strength and low optical attenuation

Chemically homogeneous cycloolefin copolymers of polycyclic olefins, such as, for example, norbornene or tetracyclododecene, with cycloolefins and/or acyclic olefins are obtained without ring opening and in a high space-time yield if a catalyst system is used which comprises an aluminoxane and a stereorigid metallocene compound of an element from groups IVb to VIb, of the formula

Metallocene and catalyst used for the preparation of chemically homogeneous cycloolefin copolymers

For optical applications, transparent amorphous thermo-plastics, such as polyaryl ether ketones, are of considerable interest. However, polyaryl ether ketones have inadequate UV stability and weathering resistance while amorphous polyaryl esters do not have these negative properties. The properties can be improved by means of polymer alloys, giving weathering-resistant materials from homogeneously mixed polymers which comprise at least one amorphous polyaryl ether ketone and at least one amorphous polyaryl ester.

Weathering-resistant polymer alloys

A substrate for liquid-crystal displays is formed from polymers of polycyclic olefins by polymerization, without ring opening, of at least one monomer of the formula (I), (II), (III), (IV), (V) or (VI). The novel use of cycloolefin copolymers as substrate material facilitates process temperatures of above 180.degree. C. in the production of displays. Cycloolefin copolymers are lighter and less brittle than glass. Compared with other plastics, they have advantages in photoelastic constants, thermal expansion, hardness, density, transparency, water absorption and with respect to birefringence. Furthermore, they have high resistance to polar solvents.

Cycloolefin copolymers (COCS) as substrate material for liquid-crystal

Cycloolefin polymers having a high viscosity number are obtained by polymerization of a polycyclic olefin and, if desired, an acyclic olefin and/or a monocyclic olefin in the presence of a catalyst system which comprises an aluminoxane and a metallocene compound of the formula ##STR1## in which R.sup.16 is fluorenyl or indenyl and R.sup.17 is cyclopentadienyl and the bridge R.sup.18 contains silicon.

Process for preparing cycloolefin polymer

The invention relates to a process for the preparation of a catalyst system supported on a support. The catalyst system is built up from at least one catalyst and at least one cocatalyst. The catalyst and the cocatalyst supported on a support material are brought into contact in a suspension solution. The fixing of the catalyst to the support is carried out under the action of microwaves.

Supported catalyst system, the preparation thereof, and the use thereof

A magneto-optical recording medium containing a substrate formed from polymers which are prepared by polymerization without ring cleavage, of monomers comprising polycyclic olefins, such as norbornene, results in a recording medium having increased thermal dimensional stability and resistance to hydrolysis, and decreased moisture absorption and birefringence.

Magneto-optical recording medium

Cycloolefin block copolymers, which in particular are suitable as phase promoters, are preferably obtained by copolymerization of polycyclic olefins, such as norbornene, with acyclic olefins, such as ethylene, by, at a molecular weight distribution M.sub.w /M.sub.n of the polymer block forming of less than 2, changing the reaction conditions one or more times in such a way that the monomer/comonomer ratio changes by at least 10% or a further polymerizable monomer is metered into the monomer or the monomers.

Cycloolefin block copolymers and a process for their preparation

Cycloolefin copolymers having low melt viscosity and low optical

Transparent cycloolefin copolymers having a high tensile strength are obtained by polymerization of a polycyclic olefin, ethylene and, if desired, an acyclic olefin and/or a monocylcic olefin in the presence of a catalyst system which comprises a cocatalyst and an asymmetrical metallocene compound of the formula ##STR1## in which R.sup.16 is cyclopentadienyl and R.sup.17 is indenyl.

Process for preparing cycloolefin copolymers

A flexible single- or multilayer non-oriented or mono- or biaxially oriented film in which at least one layer comprises a cycloolefin copolymer, wherein the cycloolefin copolymer has a mechanical loss factor (tan .delta.) of .gtoreq.0.015 at 50.degree. C. below the glass transition temperature.

Flexible cycloolefin copolymer film and method of preparing same

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Frankfurt am Main, Germany

Michael-Joachim Brekner