Polyester film, process for producing the same and use thereof

Details Polyester film, process for producing the same and use thereof Polyester film, process for producing the same and use thereof

2006-01-31

2011-10-04

Boykin, Terressa M (Department: 1765)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

C264S176100, C264S219000, C427S145000, C427S152000, C428S156000, C428S170000, C428S172000, C428S195100, C430S286100, C430S480000, C528S272000

Reexamination Certificate

active

08030434

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.

REFERENCES:
patent: 2002/0010309 (2002-01-01), Oguro et al.
patent: 2003/0195303 (2003-10-01), Ikeda et al.
patent: 1847561 (2007-10-01), None
patent: 2002-173539 (2002-06-01), None
patent: 2003-183421 (2003-07-01), None
patent: 2003-183422 (2003-07-01), None
patent: 2003-183423 (2003-07-01), None
patent: 2003-246922 (2003-09-01), None
patent: 2005-343953 (2003-12-01), None
International Search Report of PCT/JP2006/301503, Mail Date Mar. 28, 2006.

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