Phase difference film and production method therefor
First Claim
1. A retardation film comprising an optically anisotropic layer and a retardation layer, the retardation layer comprising an aligned liquid crystalline compound, wherein the optically anisotropic layer contains at least one material selected from the group consisting of polyamide, polyimide, polyester, poly(etherketone), poly(amide-imide), and poly(ester-imide), the optically anisotropic layer is formed on a transparent base, and the retardation layer is laminated directly on the optically anisotropic layer.
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Abstract
A retardation film that has an optical retardation layer whose alignment direction is controlled precisely and that is produced at a low cost, and also a method for producing the same, are provided. The explanation below relates to FIG. 1. First, a base-attached anisotropic layer 12 is prepared by laminating an optically anisotropic layer 11 on a transparent base 10. Next, on the optically anisotropic layer 11, a solution containing a polymer reacting with polarized ultraviolet light and a liquid crystalline compound is coated and dried. Then, it is irradiated with polarized ultraviolet light so as to align the liquid crystalline compound, and irradiated further with unpolarized ultraviolet light as required to crosslink the liquid crystalline compound, thereby forming a retardation film 1 having an optical retardation layer 13 that is directly formed on the optically anisotropic layer 11.
253 Citations
31 Claims
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1. A retardation film comprising an optically anisotropic layer and a retardation layer, the retardation layer comprising an aligned liquid crystalline compound,
wherein the optically anisotropic layer contains at least one material selected from the group consisting of polyamide, polyimide, polyester, poly(etherketone), poly(amide-imide), and poly(ester-imide), the optically anisotropic layer is formed on a transparent base, and the retardation layer is laminated directly on the optically anisotropic layer.
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11. (canceled)
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13. (canceled)
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19. A method for producing a retardation film, the method comprising steps of:
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applying a solution containing at least one material selected from the group consisting of polyamide, polyimide, polyester, poly(etherketone), poly(amide-imide), and poly(ester-imide), drying the solution so as to form an optically anisotropic layer, applying a solution that contains a liquid crystalline compound and a polymer to react with polarized ultraviolet light, onto the optically anisotropic layer;
drying the solution so as to form a precursor layer of a retardation layer; and
irradiating a surface of the precursor layer with polarized ultraviolet light. - View Dependent Claims (20, 21, 22, 23, 24)
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25. A method for producing a retardation film, the method comprising steps of:
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stretching or shrinking an optically anisotropic layer together with a base on which the optically anisotropic layer is formed;
applying a solution that contains a liquid crystalline compound and a polymer that reacts with polarized ultraviolet light, onto the optically anisotropic layer;
drying the solution so as to form a precursor layer of a retardation layer; and
irradiating a surface of the precursor layer with polarized ultraviolet light. - View Dependent Claims (26, 27, 28, 29, 30)
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Specification