Nitto-denko Corporation

Senri Kondou

Youichirou Sugino

Seiichi Kusumoto

Eiji Hamamoto

Kazuki Tsuchimoto

Hisashi Mihara

Takashi Shouda

Yuuji Saiki

Masayuki Satake

Takuya Matsunaga

Yuji Saiki

Yasushi Takahashi

A polarizing plate excellent in polarization performance in all wavebands from a short wavelength region to a long wavelength region and a liquid crystal display using such a polarizing plate. The polarizing plate including a polarizer has a portion having a polarization degree of 99% or more at each wavelength of light for wavelengths of 420 to 550 nm and a portion having a polarization degree of 99% or more at each wavelength of light for wavelengths of 550 to 700 nm.

Polarizing plate and liquid crystal display using the same

A polarizing plate produced according to the present invention includes a polarizing film and a protective layer bonded to a surface of the polarizing film, where the protective layer has no irregularities like record grooves caused by stretching of the polarizing film, so that the polarizing plate with an improved appearance provides clear images even when reflected light is applied. Such a polarizing plate is produced by laminating a protective layer on at least one surface of a polarizer while limiting moisture content of the polarizer to a range from 5% to 30%. A value for the moisture content is obtained by a calculation based on an equation of moisture content (%)=[(A&#x2212;B)/B]&#xd7;100, when A denotes weight of the polarizer before bonding and B denotes weight of the polarizer after being kept in a dryer of 120&#xb0; C. for seven hours.

Method of producing polarizing plate, and liquid crystal display comprising the polarizing plate

A polarizing plate having excellent moisture durability and a liquid crystal display using the same are disclosed. The polarizing plate is produced by covering all surfaces and sides of a polarizer with low moisture-permeable layers having moisture permeability of 310 g/m&#xb7;24 h or less. The rate of change in dimension of the polarizer in the uniaxially stretched direction is &#xb1;0.1% or less after left at a temperature of 60&#xb0; C. and humidity of 95% for 100 hours.

Polarizing plate having polarizer sides covered with low moisture permeable layers with permeability different than protective films covering the polarizer surfaces

A polarizing plate having excellent moisture durability and a liquid crystal display using the same are disclosed. The polarizing plate is produced by covering all surfaces and sides of a polarizer with low moisture-permeable layers having moisture permeability of 310 g/m &middot;24 h or less. The rate of change in dimension of the polarizer in the uniaxially stretched direction is &plusmn;0.1% or less after left at a temperature of 60&deg; C. and humidity of 95% for 100 hours.

Polarizing plate having all surfaces and sides covered with low moisture-permeable layers and liquid crystal display using the same

A polarizer having good durability that is dyed by iodine, and is given boric acid processing, and moreover contains zinc without generating fault by deposit of boric acid or zinc, may be produced by a process of producing, comprising the steps of: conducting a dyeing processing by iodine to a non-stretched poly vinylalcohol film; conducting an uniaxial stretching processing and a boric acid processing; subsequently conducting a zinc impregnation processing; and furthermore, conducting an iodine ion impregnation processing.

Process of producing a polarizer, polarizer, polarizing plate, and visual display

A polarizing plate is provided with an optical compensation film and includes a polarizing plate, an adhesive layer A, an optical compensation film, and an adhesive layer B adhered to one another, wherein the polarizing plate comprises a polyvinyl alcohol polarizing film containing a dichroic substance, and wherein the elastic modulus of the adhesive layer A of the polarizing plate with an optical compensation film is not greater than 0.06 MPa. Furthermore, a liquid crystal display is provided in which the polarizing plate with an optical compensation film is furnished on at least one side of the liquid crystal cell. Thus, display irregularities can be improved.

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Ibaraki, Japan

Senri Kondou