Title:
低光遅延値を有する熱可塑性ポリカーボネートフィルムを形成する方法
Document Type and Number:
Japanese Patent JP4434700
Kind Code:
B2
Abstract:
A method of preparing a thermoplastic polycarbonate film having an optical retardation value of less than or equal to 20 nm, is described. The method includes: (a) forming a molten extrudate (20) of a thermoplastic polycarbonate polymer in an extruder (11) having a terminal die (17) through which the molten extrudate is passed, the molten extrudate having a temperature of 150 DEG C to 400 DEG C upon emerging from terminal die (17); and (b) passing molten extrudate (20), from die (17), between two counter-rotating rolls (23 and 26) each having an elastomeric polymer surface (35 and 38), the counter-rotating rolls having a roll speed ratio and a nip (41), the distance between the terminal die (17) and the nip (41) being a die-nip distance (47). The extrudate temperature, the roll speed ratio and the die-nip distance (47) are each selected such that a thermoplastic polycarbonate film (32) having an optical retardation value of less than or equal to 20 nm is formed.
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Inventors:
Shu Liu
Louis A. Colon
Louis A. Colon
Application Number:
JP2003389486A
Publication Date:
March 17, 2010
Filing Date:
November 19, 2003
Export Citation:
Assignee:
Bayer MaterialScience LLC
International Classes:
B29C43/24; B29C48/08; B29C48/92; B29D7/01; B29C43/22; B29C43/46; B29K69/00; B29L7/00
Domestic Patent References:
| JP10217313A | ||||
| JP60214923A | ||||
| JP2001030337A | ||||
| JP2238922A | ||||
| JP10264238A | ||||
| JP7299828A | ||||
| JP2286221A | ||||
| JP62140817A | ||||
| JP4224924A | ||||
| JP1310930A | ||||
| JP10249909A | ||||
| JP5212772A | ||||
| JP2002301756A |
Attorney, Agent or Firm:
Aoyama Aoi
Muneo Yamamoto
Masaishi Nishishita
Muneo Yamamoto
Masaishi Nishishita