Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
  • B32B7/02—Physical, chemical or physicochemical properties
  • B32B7/023—Optical properties
• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B5/00—Optical elements other than lenses
  • G02B5/30—Polarising elements
  • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
  • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
  • G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
  • G02B5/305—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks including organic materials, e.g. polymeric layers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2457/00—Electrical equipment
  • B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays
  • B32B2457/202—LCD, i.e. liquid crystal displays

Definitions

• a TAC film As the polarizer protective film, a TAC film has been conventionally used. However, as described in the background art, a polarizer protective film made of a polyester film has attracted attention as an alternative.
• the polarizing plate has a structure in which a polarizer is sandwiched between two polarizer protective films.
• two polarizing plates made of polyester film of at least one of the two polarizer protective films are prepared and arranged so that the two polarizing plates are in a crossed Nicols environment, there is a slight light leakage.
• This invention makes it one subject to provide the polarizer protective film which consists of a polyester film which can suppress the above-mentioned slight light leakage.
• the plane orientation degree is preferably 0.08 or more, and more preferably 0.1 or more. If the degree of plane orientation is less than 0.08, the film thickness varies, and the retardation value may be non-uniform in the film plane.
• the present invention in order to improve the adhesiveness with the polarizer, it has an easy-adhesion layer mainly composed of at least one of a polyester resin, a polyurethane resin or a polyacrylic resin on at least one side of the oriented polyester film.
• the “main component” refers to a component that is 50% by mass or more of the solid components constituting the easy-adhesion layer.
• the coating solution used for forming the easy-adhesion layer is preferably an aqueous coating solution containing at least one of a water-soluble or water-dispersible copolymerized polyester resin, an acrylic resin, and a polyurethane resin.
• the easy-adhesion layer can be obtained by applying the coating solution on one or both sides of an unstretched film or a uniaxially stretched film in the longitudinal direction, drying at 100 to 150 ° C., and stretching in the lateral direction.
• the final coating amount of the easy adhesion layer is preferably controlled to 0.05 to 0.2 g / m 2 . If the coating amount is less than 0.05 g / m 2 , the adhesion with the resulting polarizer may be insufficient. On the other hand, when the coating amount exceeds 0.2 g / m 2 , blocking resistance may be lowered.
• the application quantity of an easily bonding layer on both surfaces may be the same or different, and can be independently set within the above range.
• the polyester film After the polyester film has been stretched in the longitudinal and transverse directions, it is possible to obtain a slit roll by cutting both edges into a mill roll through a heat treatment step and slitting as necessary.
• the range of 33% at both ends of the mill roll (33% from the right end of the film and 33% from the left end of the film) tends to have a particularly high difference in thermal shrinkage in the oblique direction. Therefore, for example, in the case of off-line annealing, it is preferable to adjust the temperature and time of the annealing process to be sufficiently secured.
• the two polarizing plates thus obtained were placed in a crossed Nicol state so that the polyester film was outside the two polarizers, and the maximum at a wavelength of 550 to 600 nm was measured using a spectrophotometer V7100 manufactured by JASCO Corporation. The light transmittance was measured. ⁇ : Maximum light transmittance is 0.02% or less ⁇ : Maximum light transmittance exceeds 0.02%
• the biaxial refractive index anisotropy ( ⁇ Nxy) was determined by the following method.
• the unstretched film on which this coating layer was formed was guided to a tenter stretching machine, guided to a hot air zone at a temperature of 125 ° C. while being gripped by a clip, and stretched 4.0 times in the width direction.
• a mill roll made of a uniaxially oriented PET film having a film thickness of about 50 ⁇ m was obtained by processing at a temperature of 225 ° C. for 30 seconds while keeping the width stretched in the width direction, and cutting and removing both edges. .
• This mill roll was divided into three equal parts to obtain three slit rolls (L, C, R). For each slit roll, two types were prepared: one that had been subjected to an offline annealing treatment at 90 ° C. for 5 minutes, and one that wanted to be subjected to the offline annealing treatment.
• Table 3 shows the results of rainbow-eye observation and tear strength measurement of the liquid crystal display device manufactured as described above using the polarizer protective films 1 to 15 (samples processed by off-line annealing).

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• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Optics & Photonics (AREA)
• Polarising Elements (AREA)
• Chemical & Material Sciences (AREA)
• Liquid Crystal (AREA)
• Engineering & Computer Science (AREA)
• Nonlinear Science (AREA)
• Manufacturing & Machinery (AREA)
• Laminated Bodies (AREA)
• Mathematical Physics (AREA)
• Manufacture Of Macromolecular Shaped Articles (AREA)
• Crystallography & Structural Chemistry (AREA)
• Materials Engineering (AREA)
• Health & Medical Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Medicinal Chemistry (AREA)
• Polymers & Plastics (AREA)
• Organic Chemistry (AREA)

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