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US 7,604,852 B2Granted
Cellulose acylate film and process for producing the same, and optical film and image display device using the cellulose acylate film
AssigneeFUJIFILM Corporation
InventorToyohisa Oya
Life of this patent
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Abstract
A process for producing a cellulose acylate film, the process comprising melt-cast filming a composition comprising a cellulose acylate that has a specific acyl substitution degree, and that has a residual sulfate in an amount equal to or less than a definite amount (in terms of an amount of a sulfur atom), and a a cellulose acylate film produced by the process, a high-quality retardation film, a polarizing plate, an optical compensatory film, an anti-reflective film and an image display device using same.
Claims18
A process for producing a cellulose acylate film, the process comprising:
- melt-cast filming a composition comprising a cellulose acylate that has an acyl substitution degree satisfying numerical formulae (1) to (3), and a residual sulfate in an amount of from 0 to 500 ppm, in terms of an amount of a sulfur atom,
- 2.0≦A+B≦3 numerical formula (1)
- 0.25≦A≦1.7 numerical formula (2)
- 1.0≦B≦2.75 numerical formula (3)
- wherein A represents a substitution degree of an acetyl group;
- and
- B represents a sum of a substitution degree of an acyl group having 3 to 7 carbon atoms.
4 more elements
Dependencies are inferred from the claim text.