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Michael Joachim Brekner, Jurgen Rohrmann, Walter Spaleck, Martin Antberg: Process for the preparation of cycloolefin polymers. Hoechst Aktiengesellschaft, February 11, 1992: US05087677 (147 worldwide citation)

Polymers of polycyclic olefins of the formulae I to IV having a viscosity number greater than 20 cm.sup.3 /g and a glass transition temperature above 100.degree. C. are obtained without ring opening at a high polymerization rate and at polymerization temperatures advantageous from the technical poin ...


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Cynthia Bennett, Michael Joachim Brekner, Jochen Coutandin, Otto Herrmann Schoenherr, Frank Osan: Semi-crystalline cycloolefin copolymer film. Hoechst Aktiengesellschaft, Foley & Lardner, September 3, 1996: US05552504 (43 worldwide citation)

A film including semi-crystalline cycloolefin copolymers which have a content of catalyst residues of <100 ppm and their use as capacitor films, reproduction films, film keyboards and film switches, substrates for liquid crystal displays and packaging films.


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Michael Joachim Brekner, Hellmuth Deckers, Frank Osan: Cycloolefin copolymers having low melt viscosity and low optical attenuation. Hoechst Aktiengesellschaft, Curtis Morris & Safford P C, June 10, 1997: US05637400 (38 worldwide citation)

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


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Cynthia Bennett, Michael Joachim Brekner, Otto Herrmann Schoenherr, Frank Osan: Rigid cycloolefin copolymer film. Hoechst Aktiengesellschaft, Foley & Lardner, July 9, 1996: US05534606 (35 worldwide citation)

A rigid 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 an intrinsic E modulus (E.sub.i) which has the following dependence on the glass transition temperature T.sub.g :


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Ulrich Epple, Michael Joachim Brekner: Polymer blends of cycloolefin polymers and polyolefins. Hoechst Aktiengesellschaft, Curtis Morris & Safford, October 25, 1994: US05359001 (34 worldwide citation)

For producing 100 parts by weight of a polymer blend 0 to 95 parts by weight of a finely divided polyolefin, 0 to 95 parts by weight of finely divided cycloolefin polymer and 0.1 to 99 parts by weight of a blockpolymer (which consists of monomeric units derived from norbornen and monomeric units der ...


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Michael Joachim Brekner, Frank Osan: Cycloolefin (co)polymers with a narrow molecular weight distribution and a process for the preparation thereof. Hoechst Aktiengesellschaft, Connolly & Hutz, June 6, 1995: US05422409 (34 worldwide citation)

Polymers of polycyclic olefins such as, for example, norbornene or tetracyclododecene, or copolymers of polycyclic olefins with cycloolefins and/or 1-olefins with a very narrow molecular weight distribution are obtained without ring opening by a polymerization in which a catalyst which is composed o ...


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Michael Joachim Brekner, Frank Osan, Jurgen Rohrmann: Cycloolefin block copolymers and a process for their preparation. Hoechst Aktiengesellschaft, Connolly and Hutz, July 19, 1994: US05331057 (34 worldwide citation)

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 le ...


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Michael Joachim Brekner, Frank Osan, Jurgen Rohrmann, Martin Antberg: Process for the preparation of chemically homogeneous cycloolefin copolymers. Hoechst Aktiengesellschaft, Connolly and Hutz, June 28, 1994: US05324801 (33 worldwide citation)

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 ste ...


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Michael Joachim Brekner, Horst Tore Land, Frank Osan: Fiber-reinforced cycloolefin copolymer material, process for its preparation and shaped articles from the material. Hoechst Aktiengesellschaft, Curtis Morris & Safford, June 27, 1995: US05428098 (29 worldwide citation)

A fiber-reinforced cycloolefin polymer material comprises 1 to 99% by weight of reinforcing fibers, in particular glass fibers, and 99 to 1% by weight of a cycloolefin copolymer which is built up from


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