| abstract |
Amorphous polyolefins include units derived from a mono-olefin such as ethylene and/or propylene and units derived from a norborene type olefin of the formula (I): <IMAGE> where - n1 is 0,1 or 2; R is a divalent aromatic group; or together with the carbon atoms (of the norbornene ring) to which it is attached forms an aromatic group; and each R<1>, and each R<2> is independently a hydrogen, halogen, alkyl or aryl. The polymers can include units of other norbornene type monomers. The polymers are amorphous, typically being clear and uncoloured and have high Tg values and can be used in optical components, e.g. optical discs, CD-ROM or optical fibres. |