| 摘要 |
A sheet or a film composed of at least one cyclo-olefin polymer selected from the group consisting of ring-opened polymers derived from at least one cyclo-olefin of formula (I)~~~ (see formula I) wherein R1 to R12, independently from each other, represent a member selected from the class consisting of a hydrogen atom, halogen atoms and hydrocarbon groups; two of R9 to R12 may be linked to each other together with the carbon atoms to which they are bonded to form a monocyclic or polycyclic group which may contain a double bond; R9 and R10, or R11 and R12 may each form an alkylidene group together with the carbon atoms to which they are bonded; and n is 0 or a positive integer, ring-opened copolymers derived from the cyclo-olefins of formula (I), hydrogenation products of said polymer or copolymers and addition polymers of the cyclo-olefins of formula (I) with ethylene, said cyclo-olefin polymer having an intrinsic viscosity ¢~!, measured in decalin at 135 .degree.C, of 0.01 to 10 dl/g and a softening temperature of at least 70 .degree.C.
|
