摘要:
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.
摘要:
A material of a cycloolefin copolymer has a structure of alternating cycloolefin sequences, and has crystallinity in a temperature range from 210.degree. to 320.degree. C. The cycloolefin is prepared by polymerization of at least one polycyclic olefin, monocyclic and/or acyclic olefin with an open-chain olefin using a catalyst of a metallocene and an aluminoxane.
摘要:
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.
摘要:
The present invention relates to a stereorigid metallocene compound containing, as ligands, at least two substituted or unsubstituted cyclopentadienyl groups which are bonded to one another via a monocyclic or polycyclic ring system, where at least one cyclopentadienyl group is fused to the monocyclic or polycyclic ring system, and to a process for the preparation of a cycloolefin copolymer. The cycloolefin copolymers obtained in this way have high tear strengths and are suitable for the production of extrusion parts and injection moldings.
摘要:
The present invention relates to a stereorigid metallocene compound containing, as ligands, at least two substituted or unsubstituted cyclopentadienyl groups which are bonded to one another via a monocyclic or polycyclic ring system, where at least one cyclopentadienyl group is fused to the monocyclic or polycyclic ring system, and to a process for the preparation of a cycloolefin copolymer. The cycloolefin copolymers obtained in this way have high tear strengths and are suitable for the production of extrusion parts and injection moldings.
摘要:
A process for preparing a cycloolefin copolymer by polymerization of at least one cycloolefin and at least one acyclic olefin in the presence of a catalyst which contains at least one cocatalyst and at least one metal-locene of the formula (I) ##STR1##
摘要:
The present invention relates to a process for the preparation of a polyolefin by polymerization of at least one olefin in the presence of a stereorigid metallocene compound containing, as ligands, at least two substituted or unsubstituted cyclopentadienyl groups bonded to one another via a monocyclic or polycyclic ring system, in which at least one cyclopentadienyl group is fused to the monocyclic or polycyclic ring system.
摘要:
As starting materials for substrates for optical storage disks, cycloolefin copolymers (COC) are produced by a polymerization process in which the polymerization is terminated at a point in time at which the molar-mass distribution M.sub.w /M.sub.n is 15,000 g/mol and M.sub.w /M.sub.n less than/equal to 4 and greater than/equal to 2. The substrate is produced by thermal deformation either of a single COC having a molar-mass distribution M.sub.w /M.sub.n of
摘要:
In accordance with the present invention, novel superparamagnetic magneto-dielectric polymer nanocomposites are synthesized using a novel process. The tunability of the dielectric/magnetic properties demonstrated by this novel highly-viscous solvent-free polymer nanocomposite that is amenable to building 3D electromagnetic structures/devices by using processes such as 3D printing, compression molding or injection molding, when an external DC magnetic field is applied, exceeds what has been previously reported for magneto-dielectric polymer nanocomposite materials.