Optical film, method for producing the same and polarizing plate using the same
US7964127B2 · kind B2 · utility
1Cited by
1References
10Claims
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Key dates
| Filing date | Aug 26, 2010 |
| Grant date | Jun 21, 2011 |
| Priority date | — |
| Expiry date | Aug 26, 2030 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2995/0034
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method for producing an optical film comprising the steps of: (i) melt casting a cellulose ester resin or a cycloolefin resin by extruding melt of the cellulose ester resin or the cycloolefin resin from a die onto a roll-shaped cooling drum; (ii) cooling and solidifying the extruded melt to form a film; (iii) stretching the film in a lateral direction of the film; and (iv) winding the film in a roll, wherein the cooling drum has plural regions divided predeterminedly in an axis direction of the cooling drum, a temperature of each region being independently controlled.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.