Patent ID: 8289494

Claim:
A polymer film with R 450 /R 550 <1, wherein R 450 is the optical on-axis retardation at a wavelength of 450 nm and R 550 is the optical on-axis retardation at a wavelength of 550 nm, said film being obtainable by polymerizing one or more polymerizable compounds, wherein said polymerizable compounds contain two mesogenic groups comprising one or more non-aromatic rings, one or more polymerizable groups attached to at least one of the mesogenic groups either directly or via spacer groups, and a bridging group connecting the mesogenic groups, comprising one or more subgroups selected from pi-conjugated linear carbyl or hydrocarbyl groups, aromatic and heteroaromatic groups, and being linked to a sp 3 -hybridized C-atom or Si-atom in a non-aromatic ring of each mesogenic group.