Method for producing optical film
AssigneeKonica Minolta, Inc.
InventorsKenji Hayashi, Yoshiro Toda, Takato Chiba
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Abstract
Provided is a method for producing an optical film using simultaneous multilayer coating application, the method being capable of reducing the incidence of coating failure in an optical film. The present invention relates to a method for producing an optical film having at least two or more optical functional layers formed on a base material, the method including: a loss modulus checking step of checking the loss moduli of coating liquids capable of forming the respective optical functional layers by measuring dynamic viscoelasticity; and a coating application step of performing simultaneous multilayer coating application of the coating liquids capable of forming the respective optical functional layers on the base material.
Claims9
A method for producing an optical film having at least two or more optical functional layers formed on a base material, the method comprising:
- a loss modulus checking step of checking the loss moduli of coating liquids capable of forming the respective optical functional layers by measuring dynamic viscoelasticity;
- and
- a coating application step of performing simultaneous multilayer coating application of the coating liquids capable of forming the respective optical functional layers on the base material,
- wherein in the coating application step, coating application is performed when the time variations of the loss modulus (ΔG″), as defined by the following Equation 1, of the coating liquids capable of forming the respective optical functional layers are 3.0 or less:
- ΔG″=G″(60)−G″(0) (Equation 1)
- wherein G″(60) represents the value of loss modulus at a measurement time of 60 minutes;
- and G″(0) represents the value of loss modulus at a measurement time of 0 minutes.
The method for producing an optical film according to claims wherein at least one of the coating liquids capable of forming the respective optical functional layers contains a crosslinking component.
Dependencies are inferred from the claim text.