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US 7,804,566 B2Granted
Cellulose acylate film, polarizing plate and liquid crystal display device
AssigneeFUJIFILM Corporation
InventorSusumu Sugiyama
Life of this patent
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Abstract
A cellulose acylate film, which has a film thickness of from 20 to 70 μm and an elastic modulus of from 3.5 to 10 GPa in at least one direction of a film casting direction and a width direction.
Claims4
A method for producing a cellulose acylate film, the method comprising:
- subjecting a film to a stretching treatment,
- wherein the stretching treatment is carried out with a stretching ratio in a film casting direction within a range of from 1.2 to 4.0 and a stretching ratio in a width direction within a range of from 1.05 to 3.8, in which the film casting direction and the width direction are orthogonal to each other, and with a stretching treatment temperature of equal to or more than a glass transition temperature of the film +25° C. and equal to or less than a crystallization temperature of the film, and
- wherein a thickness of the film after being subjected to the stretching treatment is from 20 to 70 μm.
A method for producing a cellulose acylate film, the method comprising:
- subjecting a film to a stretching treatment,
- wherein the stretching treatment is carried out with a stretching ratio in a film casting direction within a range of from 1.2 to 4.0 and a stretching ratio in a width direction within a range of from 1.05 to 3.8, in which the film casting direction and the width direction are orthogonal to each other, and with a stretching velocity of 10%/ minute or less in at least one direction of the film casting direction and the width direction, and
- wherein a thickness of the film after being subjected to the stretching treatment is from 20 to 70 μm.
Dependencies are inferred from the claim text.