Invention Grant
- Patent Title: Polyester film, process for producing the same and use thereof
- Patent Title (中): 聚酯薄膜，其制造方法及其用途
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Application No.: US11815361Application Date: 2006-01-31
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Publication No.: US08030434B2Publication Date: 2011-10-04
- Inventor: Tsuyoshi Ikeda , Koshi Koide , Nobuyuki Koike , Tadashi Kawabata , Takeshi Hirokane , Shojiro Kuwahara
- Applicant: Tsuyoshi Ikeda , Koshi Koide , Nobuyuki Koike , Tadashi Kawabata , Takeshi Hirokane , Shojiro Kuwahara
- Applicant Address: JP Tokyo
- Assignee: Mitsubishi Gas Chemical Company, Inc.
- Current Assignee: Mitsubishi Gas Chemical Company, Inc.
- Current Assignee Address: JP Tokyo
- Agency: Antonelli, Terry, Stout & Kraus, LLP.
- Priority: JP2005-026943 20050202
- International Application: PCT/JP2006/301503 WO 20060131
- International Announcement: WO2006/082797 WO 20060810
- Main IPC: C08G63/02
- IPC: C08G63/02 ; C08G63/00
Abstract:
The present invention relates to a polyester film produced by melt-extruding a polyester composed of a dicarboxylic acid unit and a diol unit, wherein 1 to 80 mol % of the diol unit is a unit containing a cyclic acetal skeleton, and the polyester film has an in-plane retardation of 20 nm or less at a wavelength of 550 nm. The polyester film is an optically isotropic polyester film which is easily produced by an extrusion-molding method and has an economical advantage. The polyester film is useful for production of optical members or optical products such as phase difference films, protective films for polarizing plates, light diffusion films, lens sheets, anti-reflection films and optical information recording media.
Public/Granted literature
- US20090016209A1 POLYESTER FILM, PROCESS FOR PRODUCING THE SAME AND USE THEREOF Public/Granted day:2009-01-15
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