Title:
OPTICAL FILM MANUFACTURING METHOD
Document Type and Number:
WIPO Patent Application WO/2013/035249
Kind Code:
A1
Abstract:
The invention relates to an optical film manufacturing method for manufacturing optical films using a cast film extruder, which has at least a flow-casting unit for forming the flow-cast film by discharging a dope of a mixed resin of acrylic resin and cellulose ester resin starting materials solubilized in a solvent from a die and flow-casting a dope film onto an endless belt support, a drawing unit for drawing the flow-cast film after being peeled from the endless belt support, a drying unit for drying, and a take-up unit for winding. The optical film manufacturing method is characterized in that the flow-casting unit has an edge-reinforcing solution-supplying means for supplying an edge-reinforcing solution containing the cellulose ester resin in a higher mass ratio than the mass ratio of the cellulose ester resin configuring the dope onto both edges of the dope film or the flow-cast film, and performs flow-casting while supplying the edge-reinforcing solution onto both edges from the edge-reinforcing solution-supplying means.
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Inventors:
KANEKO TADAHIRO (JP)
Application Number:
PCT/JP2012/005175
Publication Date:
March 14, 2013
Filing Date:
August 16, 2012
Export Citation:
Assignee:
KONICA MINOLTA ADVANCED LAYERS (JP)
KANEKO TADAHIRO (JP)
KANEKO TADAHIRO (JP)
International Classes:
B29C41/28; G02B5/30; B29K1/00; B29K33/00; B29L7/00; B29L11/00
Domestic Patent References:
| WO2009150926A1 | 2009-12-17 | |||
| WO2011055590A1 | 2011-05-12 |
Foreign References:
| JP2005279956A | 2005-10-13 | |||
| JP2009234169A | 2009-10-15 | |||
| JP2008183758A | 2008-08-14 | |||
| JP2005199725A | 2005-07-28 | |||
| JP2010179475A | 2010-08-19 | |||
| JPH02208650A | 1990-08-20 |
Attorney, Agent or Firm:
KOTANI, Etsuji et al. (JP)
Etsuji Kotani (JP)
Etsuji Kotani (JP)
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Claims: