Cellulose ester film, polarizing plate and liquid crystal display
A technology of cellulose ester film and cellulose ester, which is applied in the direction of polarizing elements, transportation and packaging, coating, etc., can solve the problems of reduced retardation, failure to reach the durability level of polarizers, and aggravated deterioration of polarizers, etc.
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[0158] The preparation method of the cellulose ester dope liquid in this invention is demonstrated. In a dissolution tank, flake (flaky) cellulose ester is dissolved in an organic solvent mainly being a good solvent for cellulose ester while being stirred, to form a doping solution. In dissolving, there are methods carried out under normal pressure, methods carried out below the boiling point of the main solvent, and methods carried out under pressure above the boiling point of the main solvent, such as JP 9-95544, JP 9-95557 or Various dissolution methods such as the cooling dissolution method described in JP-A-9-95538 and the method under high pressure described in JP-A-11-21379 are used. Filter the dissolved dopant with a filter material and pump it to the next step for defoaming. The concentration of cellulose ester in the dope liquid is about 10 to 35% by mass. More preferably, it is 15-25 mass %. In order to include the polymer useful in the present invention in the c...
Embodiment 1
[0428] (Synthesis of Polymer X)
[0429] In the glass flask that has stirrer, two dropping funnels, gas inlet tube and thermometer, add monomer Xa, Xb mixed solution, 2g of mercaptopropionic acid and 30g toluene as chain transfer agent of the type and ratio of 40g table 1 record, The temperature was raised to 90°C. Then, 60 g of monomer Xa and Xb mixtures of the types and ratios listed in Table 1 were added dropwise over 3 hours from one dropping funnel, and 0.4 g of azo dissolved in 14 g of toluene was added dropwise from the other funnel over 3 hours. Diisobutyronitrile. Then, 0.6 g of azobisisobutyronitrile dissolved in 56 g of toluene was added dropwise over 2 hours, and the reaction was continued for 2 hours to obtain a polymer X. The obtained polymer X was solid at normal temperature. Then, the addition amount of mercaptopropionic acid as a chain transfer agent and the addition rate of azobisisobutyronitrile were changed to prepare polymers X having different molecula...
Embodiment 2
[0499] (manufacture of polarizing plate)
[0500] Polarizing plates were produced using the cellulose ester films 1 to 30 produced in Example 1, and the deterioration of the polarizer, the dimensional stability of the polarizing plate, and the curling of the polarizing plate were evaluated.
[0501] A polyvinyl alcohol film having a thickness of 120 μm was dipped in 100 kg of an aqueous solution containing 1 kg of iodine and 4 kg of boric acid, and stretched 6 times at 50° C. to manufacture a polarizer. The above-mentioned cellulose ester films 1 to 30 subjected to the alkali saponification treatment were bonded to one side of the polarizer using a 5% aqueous solution of completely saponified polyvinyl alcohol as an adhesive.
[0502] On the other surface, an antireflection film having a hard coat layer described below was produced and bonded to produce a polarizing plate.
[0503] (alkaline saponification treatment)
[0504] Saponification step 2N-NaOH 50℃ for 90 seconds
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Abstract
Description
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