Solution film-forming method, protective film of polarizing plate, optical functional film, polarizing plate, and liquid crystal display device
AssigneeFUJIFILM Corporation
InventorHidekazu Yamazaki
Life of this patent
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Abstract
A solution film-forming method for obtaining the polymer film includes discharging a pressurized polymer solution having a specific temperature from a casting die, casting the polymer solution on a support, solidifying the polymer solution to form a film, peeling and drying the film, wherein the polymer solution to be cast on the support is mixed with a specific solvent such that E1/n is larger than 0.1 (l/second) and smaller than 3.0 (l/second) when the dynamic modulus of rigidity and dynamic coefficient of viscosity of the polymer solution immediately after discharged on the support from the casting die are E1 (Pascal) and n (Pascal·second), respectively.
Claims15
A method for obtaining a polymer film, comprising:
- providing a film-forming device, comprising:
- a dope supply device containing a prepared dope;
- a poor solvent supply device containing a poor solvent;
- a mixer connected to both the dope supply device and the poor solvent supply device;
- and
- a casting die connected to the mixer;
- preparing a polymer solution by mixing a certain amount of poor solvent from the poor solvent supply device with the prepared dope from the dope supply device in the mixer;
- delivering the polymer solution from the mixer to the casting die;
- pressurizing and discharging the polymer solution from the casting die;
- casting the polymer solution on a support;
- solidifying the polymer solution to form a film on the support;
- peeling the film from the support;
- and
- drying the film,
- wherein the poor solvent is mixed with the prepared dope such that the polymer solution has a ratio of dynamic modulus of rigidity to dynamic coefficient of viscosity of 0.1 to 3.0 (1/second) prior to discharging the polymer solution from the casting die.
Dependencies are inferred from the claim text.