Retardation film and process for producing the same
AssigneeHayashi Telempu Corporation
InventorsTakeya Sakai, Masao Uetsuki, Nobuhiro Kawatsuki
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Abstract
The invention relates primarily to a retardation film and a process for producing the retardation film, wherein a layer formed of a mixture of a photosensitive polymer and a low molecular weight compound is irradiated with linear polarized ultraviolet ray, ultraviolet ray including a perfectly polarized light component and a non-polarized light component, or a non-polarized ultraviolet ray to orient molecules thereby developing a retardation and the direction of the optical axis arbitrarily in the layer formed of a mixure.
Claims39
A process for producing a retardation film, comprising producing a retardation film by a process including a step of irradiating a mixture of a photosensitive polymer and a low molecular weight compound with light, wherein the ratio z of solubility parameters calculated from the evaporation energy and molecular volume of these photosensitive polymer and low molecular weight compound is larger than 0.93 and smaller than 1.06.
A process for producing a retardation film, comprising irradiating a film formed of a photosensitive polymer or a mixture of a photosensitive polymer and a low molecular weight compound with light with the incident angle changing in sequence.
A process for producing a retardation film, the process comprising irradiating a layer formed of a photosensitive polymer or a mixture of a photosensitive polymer and a low molecular weight compound with linear polarized lights having electric field oscillation planes differing from each other in at least two directions, wherein the light to be irradiated in at least one direction is irradiated in a direction oblique to the normal line of said layer.
A process for producing a retardation film, comprising a process of irradiating a layer made of a photosensitive polymer containing a positive index ellipsoid structure or a mixture of the polymer and a low molecular weight compound with non-polarized light or light including a perfectly polarized light component and a non-polarized light component, to control birefringence.
Dependencies are inferred from the claim text.