Optical film exhibiting excellent blocking properties for ultraviolet light and polarizing plate including the same

Abstract

The invention provides an optical film including an ultraviolet light absorbent having a first peak with a maximum absorption coefficient of 0.07 to 0.10 phr-1 [mu]m-1 in a wavelength band of 290 to 320 nm and a second peak with a maximum absorption coefficient of 0.11 to 0.16 phr-1 [mu]m-1 in a wavelength band of 330 to 400 nm, an acrylic resin, and a hindered amine light stabilizer (HALS), and a polarizing plate including the same.

Description

technical field

[0001] The present disclosure relates to an optical film having excellent ultraviolet blocking properties and a polarizing plate including the optical film, and in particular, to an optical film capable of effectively blocking ultraviolet rays in a wide wavelength band even when a small amount of ultraviolet absorbent is contained therein. And an optical film having a stable spectrum even when exposed to ultraviolet rays for a long time, and a polarizing plate using the same Background technique

[0002] Polarizing plates currently used in image display units such as liquid crystal displays generally have a triacetyl cellulose film (hereinafter TAC film) contained therein as a protective film to protect the polyvinyl alcohol polarizer. However, the TAC film may not have a sufficient degree of heat resistance and moisture resistance, and thus there may be a problem that properties such as polarization degree or color of the polarizing plate may be deteriorated...

Examples

Embodiment 1

[0216] 0.7 parts by weight of UV absorber and 0.2 parts by weight of hindered amine light stabilizer (HALS) SABOSTABUV62 manufactured by Matsubara Co., Ltd. and 100 parts by weight of poly(N-phenylmaleimide-co-methacrylic acid Methyl ester-co-alpha-methyl-styrene-co-methacrylate) is uniformly mixed to obtain a resin composition with a glass transition temperature of 120°C, and the resin composition is provided to The resin composition was melted in an extruder in which nitrogen gas was replaced from a raw material hopper to the extruder at 250° C. to prepare raw material pellets. NMR analysis results show that poly(N-phenylmaleimide-co-methyl methacrylate-co-α-methyl-styrene-co-methacrylate) resin has 5.0% by weight of N-benzene maleimide and 2.0% by weight of α-methyl-styrene.

[0217] The above-prepared raw material pellets were dried under vacuum, melted at 250° C. using an extruder, and then passed through a coat hanger type T-die, chrome-plated casting rolls, drying rol...

Embodiment 2

[0220] 0.7 parts by weight of UV absorber and 0.2 parts by weight of hindered amine light stabilizer (HALS) SABOSTABUV94 manufactured by Matsubara Co., Ltd. and 100 parts by weight of poly(N-phenylmaleimide-co-methacrylic acid Methyl ester-co-alpha-methyl-styrene-co-methacrylate) is uniformly mixed to obtain a resin composition with a glass transition temperature of 120°C, and the resin composition is provided to The resin composition was melted in an extruder in which nitrogen gas was replaced from a raw material hopper to the extruder at 250° C. to prepare raw material pellets. NMR analysis results show that poly(N-phenylmaleimide-co-methyl methacrylate-co-α-methyl-styrene-co-methacrylate) resin has 5.0% by weight of N-benzene maleimide and 2.0% by weight of α-methyl-styrene.

[0221] The above-prepared raw material pellets were dried under vacuum, melted at 250° C. using an extruder, and then passed through a coat hanger type T-die, chrome-plated casting rolls, drying rol...

Embodiment 3

[0224] 0.7 parts by weight of UV absorber and 0.2 parts by weight of hindered amine light stabilizer (HALS) LA63 manufactured by ADEKA Corporation and 100 parts by weight of poly(N-phenylmaleimide-co-methyl methacrylate Esters-co-α-methyl-styrene-co-methacrylate) are uniformly mixed to obtain a resin composition with a glass transition temperature of 120°C, and the resin composition is provided to The resin composition was melted in an extruder in which nitrogen gas was replaced from a raw material hopper to the extruder at 250° C. to prepare raw material pellets. NMR analysis results show that poly(N-phenylmaleimide-co-methyl methacrylate-co-α-methyl-styrene-co-methacrylate) resin has 5.0% by weight of N-benzene maleimide and 2.0% by weight of α-methyl-styrene.

[0225] The above-prepared raw material pellets were dried under vacuum, melted at 250° C. using an extruder, and then passed through a coat hanger type T-die, chrome-plated casting rolls, drying rolls, etc. to fina...

technical field

[0001] The present disclosure relates to an optical film having excellent ultraviolet blocking properties and a polarizing plate including the optical film, and in particular, to an optical film capable of effectively blocking ultraviolet rays in a wide wavelength band even when a small amount of ultraviolet absorbent is contained therein. And an optical film having a stable spectrum even when exposed to ultraviolet rays for a long time, and a polarizing plate using the same Background technique

[0002] Polarizing plates currently used in image display units such as liquid crystal displays generally have a triacetyl cellulose film (hereinafter TAC film) contained therein as a protective film to protect the polyvinyl alcohol polarizer. However, the TAC film may not have a sufficient degree of heat resistance and moisture resistance, and thus there may be a problem that properties such as polarization degree or color of the polarizing plate may be deteriorated...

Examples

Embodiment 1

[0216] 0.7 parts by weight of UV absorber and 0.2 parts by weight of hindered amine light stabilizer (HALS) SABOSTABUV62 manufactured by Matsubara Co., Ltd. and 100 parts by weight of poly(N-phenylmaleimide-co-methacrylic acid Methyl ester-co-alpha-methyl-styrene-co-methacrylate) is uniformly mixed to obtain a resin composition with a glass transition temperature of 120°C, and the resin composition is provided to The resin composition was melted in an extruder in which nitrogen gas was replaced from a raw material hopper to the extruder at 250° C. to prepare raw material pellets. NMR analysis results show that poly(N-phenylmaleimide-co-methyl methacrylate-co-α-methyl-styrene-co-methacrylate) resin has 5.0% by weight of N-benzene maleimide and 2.0% by weight of α-methyl-styrene.

[0217] The above-prepared raw material pellets were dried under vacuum, melted at 250° C. using an extruder, and then passed through a coat hanger type T-die, chrome-plated casting rolls, drying rol...

Embodiment 2

[0220] 0.7 parts by weight of UV absorber and 0.2 parts by weight of hindered amine light stabilizer (HALS) SABOSTABUV94 manufactured by Matsubara Co., Ltd. and 100 parts by weight of poly(N-phenylmaleimide-co-methacrylic acid Methyl ester-co-alpha-methyl-styrene-co-methacrylate) is uniformly mixed to obtain a resin composition with a glass transition temperature of 120°C, and the resin composition is provided to The resin composition was melted in an extruder in which nitrogen gas was replaced from a raw material hopper to the extruder at 250° C. to prepare raw material pellets. NMR analysis results show that poly(N-phenylmaleimide-co-methyl methacrylate-co-α-methyl-styrene-co-methacrylate) resin has 5.0% by weight of N-benzene maleimide and 2.0% by weight of α-methyl-styrene.

[0221] The above-prepared raw material pellets were dried under vacuum, melted at 250° C. using an extruder, and then passed through a coat hanger type T-die, chrome-plated casting rolls, drying rol...

Embodiment 3

[0224] 0.7 parts by weight of UV absorber and 0.2 parts by weight of hindered amine light stabilizer (HALS) LA63 manufactured by ADEKA Corporation and 100 parts by weight of poly(N-phenylmaleimide-co-methyl methacrylate Esters-co-α-methyl-styrene-co-methacrylate) are uniformly mixed to obtain a resin composition with a glass transition temperature of 120°C, and the resin composition is provided to The resin composition was melted in an extruder in which nitrogen gas was replaced from a raw material hopper to the extruder at 250° C. to prepare raw material pellets. NMR analysis results show that poly(N-phenylmaleimide-co-methyl methacrylate-co-α-methyl-styrene-co-methacrylate) resin has 5.0% by weight of N-benzene maleimide and 2.0% by weight of α-methyl-styrene.

[0225] The above-prepared raw material pellets were dried under vacuum, melted at 250° C. using an extruder, and then passed through a coat hanger type T-die, chrome-plated casting rolls, drying rolls, etc. to fina...

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