Method for producing film with twisted tilted alignment, film with twisted tilted alignment, and image display using same

1. A method for producing a twist-obliquely oriented film, comprising:

providing a substrate made of a transparent polymer;

applying metal alkoxide on the substrate;

heating the substrate to form a transparent glassy macromolecule thereby forming an alignment layer, on the substrate, containing the glassy macromolecule;

performing a rubbing treatment on the alignment layer; and

applying a liquid crystal coating solution containing a chiral agent and a photopolymerizable liquid crystal composition on the substrate so as to form a twist-obliquely oriented liquid crystal layer to form the twist-obliquely oriented film,

wherein the twist-obliquely oriented film has:

an angle of orientation that is not smaller than 1° and is smaller than 180°; and a degree of obliquity that is 30 or more, provided that the degree of obliquity is calculated as

(|Δ nd (−30)−Δ nd (+30)|/Δ nd (0))×100

wherein Δnd(0) is a retardation in a frontal direction, and Δnd(+30) and Δnd(−30) are each a corresponding retardation in a direction inclined at ±30° toward a slow axis, respectively.

2. The method for producing a twist-obliquely oriented film according to claim 1 , which further comprises:

sticking the twist-obliquely oriented liquid crystal layer of the twist-obliquely oriented film to an optical film through at least one adhesive layer; and

removing the alignment layer and the substrate.

3. A twist-obliquely oriented film according to claim 1 , wherein the angle of orientation is 20° to 90°.

4. The twist-obliquely oriented film according to claim 3 , wherein the angle of orientation is 35° to 75°.

5. A twist-obliquely oriented film according to claim 1 , wherein the degree of obliquity is 30 to 500.

6. The twist-obliquely oriented film according to claim 5 , wherein the degree of obliquity is 50 to 300.

7. A twist-obliquely oriented film according to claim 1 , wherein an oblique angle of a nematic liquid crystal molecule of the twist-obliquely oriented liquid crystal layer is 1° to 85° with respect to the direction normal to a surface of the substrate.

8. An optical film obtained by laminating at least one optical layer on a twist-obliquely oriented film according to claim 1 .

9. An image display device having an optical film according to claim 8 .

10. An image display device having a twist-obliquely oriented film according to claim 1 .

11. The method for producing a twist-obliquely oriented film according to claim 1 , wherein the glassy macromolecule comprises metal silicon alkoxide.