Optical film, method for producing the same and polarizing plate using the same

a technology of optical film and polarizing plate, applied in the field of optical film, can solve the problems of large equipment required for drying solvent, insufficient uniformity of film thickness and retardation value, and insufficient uniformity of observing field,

a technology of optical film and polarizing plate, applied in the field of optical film, can solve the problems of large equipment required for drying solvent, insufficient uniformity of film thickness and retardation value, and insufficient uniformity of observing field,

US20060214319A1Inactive Publication Date: 2006-09-28KONICA MINOLTA OPTO
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  • Optical film, method for producing the same and polarizing plate using the same
  • Optical film, method for producing the same and polarizing plate using the same
  • Optical film, method for producing the same and polarizing plate using the same

Examples

Experimental program
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Effect test

example 1

[0136]

Cellulose acetate propionate (Acetyl group100parts by weightsubstitution degree: 1.95, propionyl groupsubstitution degree: 0.7, Number average molecular weight: 75,000, Dried in vacuum for 24hours at 60° C.)Triphenyl phosphate10parts by weightEthylphthalylethyl glycol2parts by weightTinuvin 109 (Ciba Specialty Chemicals0.5parts by weightCO., Ltd.)Tinuvin 171 (Ciba Specialty Chemicals 0.5parts by weightCO., Ltd.)Tinuvin 326 (Ciba Specialty Chemicals 0.3parts by weightCO., Ltd.)Antioxidant: 2.6-di-t-butyl-p-cresol +0.01parts by weightpentaerythrytol-tetrakis[3-(3,5-di-t-butyl-4-hydroxyphenyl) propionate]

[0137] The above mixture was molten and mixed using the two-axis extruder 21 in FIG. 1 to form pellets. The pellets were molten at 250° C. and extruded through the T-die 24 into a form of film onto the cooling drum 26 held at 30° C. The width of the cooling drum 26 was 1950 mm.

[0138] The cooling drum 26 was divided into regions of: (i) each ⅕ of the width from each of the side e...

example 2

[0159] Poly vinyl alcohol having a thickness of 120 μm was immersed in 100 parts by weight of an aqueous solution containing l part by weight of iodine-and 4 parts by weight of boric acid and stretched for 4 times at 40° C. to prepare a polarization film.

[0160] Besides, Konica Minolta TAC having a thickness 80 μm, cellulose triacetate film manufactured by Konica Minolta Opto Inc., was immersed in an aqueous solution of sodium hydroxide having a concentration of 2 moles / liter for 2 minutes at 60° C. and dried for 10 minutes at 100° C. to prepare alkali saponified cellulose triacetate film for the protective film.

[0161] Thus obtained polarization film was pasted with the above triacetate film by an adhesive of 5% aqueous solution of completely saponified poly vinyl alcohol so as to prepare a polarizing plate having the protective film on one side thereof.

[0162] The optical films obtained in Example 1 were each subjected to corona treatment of 50 dyn / cm and pasted onto the side with...

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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.

Description

[0001] This application is based on Japanese Patent Application No. 2005-092168 filed on Mar. 28, 2005 in Japanese Patent Office, the entire content of which is hereby incorporated by reference. FIELD OF THE INVENTION [0002] The present invention relates to an optical film which can be applied for various kinds of functional film such as a polarizing plate protective film, a retardation film and a viewing angle extending film used for a liquid crystal displaying (LCD), an antireflection film for a plasma display, as well as a functional film for an organic EL display, and also relates to a method for producing such an optical film and to a polarizing plate using the optical film. BACKGROUND OF THE INVENTION [0003] Liquid crystal display has been widely applied as a monitor since it is space saving as well as energy saving compared to the conventional CRT display. Moreover, liquid crystal display is also becoming popular as a TV. Various kinds of optical films such as a polarization ...

Claims

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Application Information

Patent Timeline
28 Sep 2006
Publication
US20060214319A1
IPC
B29D7/01; B29C47/92; B29C47/88; B29C48/92
CPC
B29C41/26; B29C47/92; B29C47/0021; B29C47/0057; B29C47/14; B29C47/8845; B29C55/08; B29C2947/92019
Inventors
KAZAMA, KENICHI