A retardation film comprising a polymerized liquid crystal oligomer having positive intrinsic birefringence, also having a glass transition temperature of 50.degree. C. or below and showing nematic or smectic phase, characterized in that the optical axis of the film lies in the film plane, that the value...http://www.google.de/patents/US5601884?utm_source=gb-gplus-sharePatent US5601884 - Retardation film and production thereof
