Method for producing optical film

摘要

The method for producing an optical film includes a step of preparing a first coating liquid containing a certain amount of light-transmitting particles, a resin, and a solvent, a second coating liquid containing an amount less than the certain amount of light-transmitting particles, a resin, and a solvent, or not containing the light-transmitting particles but containing a resin and a solvent; a step of coating the second coating liquid and the first coating liquid in this order from the support side on a traveling band-shaped support in the form of a multilayer to form a second coating film and a first coating film; a step of transferring the light-transmitting particles in the first coating film to the side of the second coating film while drying the first coating film and the second coating film.

主权项

1. A method for producing an optical film, comprising:
a step of preparing a first coating liquid containing a certain amount of light-transmitting particles, a first resin, and a first solvent, a second coating liquid containing an amount less than the certain amount of light-transmitting particles, a second resin, and a second solvent; a step of coating the second coating liquid and the first coating liquid in this order from the support side on a traveling band-shaped support in the form of a multilayer to form a second coating film and a first coating film; a step of allowing the light transmitting particles in the first coating film to drop downwardly due to a gravitational force and thereby transferring the light-transmitting particles in the first coating film to the side of the second coating film while drying the first coating film and the second coating film; and a step of curing, the first coating film and the second coating film to form an antiglare layer including the light-transmitting particles and a resin layer, wherein when the average particle diameter of the light-transmitting particles is A and the average layer thickness of the antiglare layer is L, the presence ratio of the central position of the light-transmitting particle and the distance thereof from the support side in the resin layer, when viewing the cross-section in the vertical direction of the antiglare layer, satisfy the following relationship:
2L/3−A/6 to L−A/2: 40% to 98%  (1)L/3+A/6 to 2L/3−A/6: 1% to 50%  (2)A/2 to L3+A/6: 1% to 10%  (3).