| abstract |
The cycloolefin copolymers used in the optical data memory of the present invention are cyclic olefins, α-olefins having two or more carbon atoms, and optionally conjugated, using metallocene compounds of formula (I) or (XIII) or π complexes as catalysts Or by (co) polymerization of monomers from the group consisting of unconjugated diolefins.n n n <Formula I>n n n n n n n n <Formula XIII>n n n n n n n n (In the above formula,n n n CpI and CpII are carbanions having a cyclopentadienyl containing structure,n n n πI and πII are charged or electrically neutral π-based,n n n D is a donor atom,n n n A is a receptor atom,n n n Where D and A are connected by reversible coordination bonds such that the donor has a (partially) positive charge and the receptor has a (partially) negative charge,n n n M is a transition metal of the III, IV, V or VI subgroups of the Periodic Table of the Elements (Mendellib), including the Lanthanides and Actinides,n n n X is an anion equivalentn n n n is 0, 1, 2, 3 or 4 depending on the charge of M). |