Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1998-12-30
2000-12-05
Wu, David W.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
526160, 526281, 526308, 5263486, 526943, 526131, 502152, C08F 444
Patent
active
061568570
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to the use of .pi. systems or of metallocene compounds in which a transition metal is complexed with two .pi. systems, and in particular with aromatic .pi. systems, such as anionic cyclopentadienyl ligands (carbanions) and the two systems are bonded reversibly to one another by at least one bridge of a donor and an acceptor, as organometallic catalysts in a process for the preparation of cycloolefin (co)polymers for industrial applications, with the exception of the use for optical data memories, by (co)polymerization of monomers from the group consisting of cyclic olefins, .alpha.-olefins having 2 or more C atoms and optionally conjugated or non-conjugated diolefins. The coordinate bond formed between the donor atom and the acceptor atom produces a positive (part) charge in the donor group and a negative (part) charge in the acceptor group: ##EQU1##
BACKGROUND OF THE INVENTION
Cycloolefin (co)polymers are distinguished by many advantageous properties, for example by a high transparency for use for optical applications. They have a good heat stability, resistance to aging, resistance to chemicals, good gas barrier properties, resistance to solvents, low absorption of water, high scratch resistance, low birefringence of light and high softening point (glass transition temperature T.sub.g). Such (co)polymers are therefore suitable for, inter alia: films in non-stretched or monoaxially or biaxially stretched form for packaging and as top layers for polarization films and liquid crystal displays, coating constituents, for example for the automobile industry for scratch-resistant treatment of surfaces; fibers, for example for lightwave conductors; optical lenses and prisms; hoses, pipes, rods and supporting sheets; cover disks for solar cells; or capacitor dielectric. Such industrial articles are produced by injection molding or extrusion. The (co)polymers employed in this way are amorphous or only partly crystalline. The (co)polymers can be used by themselves or as a mixture with other polymers.
Metallocenes and their use as catalysts in the polymerization of olefins have been known for a long time (EP-A 129 368 and the literature cited therein). It is furthermore known from EP-A '368 that metallocenes in combination with aluminum-alkyl/water as cocatalysts are active systems for the polymerization of ethylene (thus, for example, methylaluminoxane=MAO is formed from 1 mol of trimethylaluminum and 1 mol of water. Other stoichiometric ratios have also already been used successfully (WO 94/20506)). Metallocenes in which the cyclopentadienyl skeletons are linked to one another covalently via a bridge are also already known. An example of the numerous Patents and Applications in this field which may be mentioned is EP-A 704 461, in which the linkage group mentioned therein is a (substituted) methylene group or ethylene group, a silylene group, a substituted silylene group, a substituted germylene group or a substituted phosphine group. The bridged metallocenes are also envisaged as polymerization catalysts for olefins in EP '461. In spite of the numerous Patents and Applications in this field, there continues to be a demand for improved catalysts which are distinguished by a high activity, so that the amount of catalyst remaining in the polymer can be set to a low level, and which are equally suitable for the (co)polymerization of cycloolefins, for the preparation of which metallocenes have likewise already been employed (U.S. Pat. No. 5,567,777; EP 610 852 U.S. Pat. No. 5,602,219; EP 690 078).
SUMMARY OF THE INVENTION
It has now been found that particularly advantageous catalysts can be prepared from bridged .pi. complex compounds, and in particular from metallocene compounds, in which the bridging of the two .pi. systems is established by one, two or three reversible donor-acceptor bonds, in which in each case a coordinate or so-called dative bond which is overlapped at least formally by an ionic bond forms between the donor atom and the acceptor atom, a
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Kelly Warren Mark
Ostoja Starzewski Karl-Heinz Aleksander
Stumpf Andreas
Bayer Aktiengesellschaft
Cheung Noland J.
Gil Joseph C.
Harlan R.
Wu David W.
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