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    CYCLO-OLEFIN COPOLYMERS WITH LOW FUSION VISCOSITY AND LOW OPTICAL ATTENUATION
    56.
    发明专利
    CYCLO-OLEFIN COPOLYMERS WITH LOW FUSION VISCOSITY AND LOW OPTICAL ATTENUATION 未知

    公开(公告)号：CA2155936A1

    公开(公告)日：1994-08-18

    申请号：CA2155936

    申请日：1994-01-31

    Applicant: HOECHST AG

    Inventor： BREKNER MICHAEL-JOACHIM ,  DECKERS HELLMUTH ,  OSAN FRANK

    IPC: G02B6/00 ,  C08F4/42 ,  C08F4/642 ,  C08F4/646 ,  C08F4/659 ,  C08F4/6592 ,  C08F4/68 ,  C08F4/72 ,  C08F8/00 ,  C08F32/00 ,  C08F210/00 ,  C08F232/00 ,  C08F232/08 ,  D01F8/06 ,  G02B1/04

    Abstract: A process for the preparation of a cycloolefin copolymer (COC) having low melt viscosity by copolymerization of from 0.1 to 99.9% by weight, based on the total amount of the monomers, of at least one monomer ¢lacuna! in which R1, R2, R3, R4, R5, R6, R7 and R8 are identical or different and are a hydrogen atom or a C1-C8-alkyl radical or an aryl radical, where identical radicals in the various formulae can have different meanings, from 0 to 99.9% by weight, based on the total amount of the monomers, of a cycloolefin of the formula V in which n is a number from 2 to 10, and from 0.1 to 99.9% by weight, based on the total amount of the monomers, of at least one acyclic 1-olefin of the formula VI, in which R9, R10, R11 and R12 are identical or different and are a hydrogen atom or a C1-C8-alkyl radical, in solution, in suspension, in the liquid cycloolefin monomer or cycloolefin monomer mixture or in the gas phase, at a temperature of from -78 to 150.degree.C, at a pressure of from 0.5 to 64 bar, in the presence of a catalyst comprising a metallocene as transition-metal component and an aluminoxane of the formula VII for the linear type and/or of the formula VIII for the cyclic type, where, in the formulae VII and VIII, R13 is a C1-C6-alkyl group or phenyl or benzyl, and n is an integer from 2 to 50, where the polymerization is carried out in the presence of a catalyst whose transition-metal component is at least one compound of the formula IX in which M1 is titanium, zirconium, hafnium, vanadium, niobium or tantalum, R14 and R15 are identical or different and are a hydrogen atom, a halogen atom, a C1-C10-alkyl group, a C1-C10-alkoxy group, a C6-C10-aryl group, a C6-C10-aryloxy group, a C2-C10-alkenyl group, a C7- C40-arylalkyl group, a C7 - C40 - alkylaryl group or a C8 - C40 -arylalkenyl group, and m may be one or two, depending on the valency of the central atom M1, R18 is =BR19, =AIR19, -Ge-, -Sn-, -O-, -S-, =SO, =SO2, =NR19, =CO, = PR19 or =P(O)R19, where R19, R20 and R21 are identical or different and are a hydrogen atom, a halogen atom, a C1-C10-alkyl group, a C1-C10-fluoroalkyl group, a C6-C10-fluoroaryl group, a C6-C10-aryl group, a C1-C10-alkoxy group, a C2-C10-alkenyl group, a C7 - C40 - arylalkyl group, a C8-C40-arylalkenyl group or a C7-C40-alkylaryl group, or R19 and R20 or R19 and R21, in each case with the atoms connecting them, form a ring, M2 is silicon, germanium or tin, R16 and R17 are different and are a monocyclic or polycyclic hydrocarbon radical which can form a sandwich structure with the central atom M1, wherein the metallocene of the formula IX has C8-symmetry with respect to the ligands R16 and R17 and with respect to the central atom M1 connecting them.

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