Transparent polymer film, and optical compensating film, polarizing plate and liquid crystal display device using the polymer film
A technology of optical compensation film and liquid crystal display device, applied in optics, polarizing elements, nonlinear optics, etc., can solve the problems of small film, difficulty, Rth change, etc., and achieve the effect of excellent optical compensation film
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preparation example Construction
[0155] The above-mentioned polymer solution used in the preparation of the transparent polymer film of the present invention may contain various liquid or solid additives suitable for different purposes in each preparation step. Examples of the above-mentioned additives include plasticizers (preferably added in an amount of 0.01 to 10% by mass relative to the polymer, the same applies hereinafter), ultraviolet absorbers (0.001 to 1% by mass), and fine particles with an average particle diameter of 5 to 3000 nm Powder (0.001-1 mass%), fluorine-based surfactant (0.001-1 mass%), release agent (0.0001-1 mass%), anti-aging agent (0.0001-1 mass%), optical anisotropy control agent ( 0.01 to 10% by mass), an infrared absorber (0.001 to 1% by mass).
[0156] The above-mentioned plasticizer and the above-mentioned optical anisotropy control agent are organic compounds having a molecular weight of 3000 or less, preferably compounds having both a hydrophobic part and a hydrophilic part. ...
Embodiment
[0297] "Assay"
[0298] First, the measurement method and evaluation method of the characteristics used in this Example are shown below.
[0299] [Delay]
[0300] Take 5 points in the width direction every 100 meters in the longitudinal direction (length direction) (central part, end part (5% of the entire width from both ends), and 2 points in the middle part of the central part and the end part point), take out a 2cm□ sample, and calculate the average value of each point according to the following method.
[0301] The retardation value of the film is adjusted by adjusting the humidity of the film for 24 hours under the condition of 25° C. and a relative humidity of 60%, and then using a prism coupler (MODEL 2010 prism Coupler: manufactured by Metrion Corporation) at 25° C. and a relative humidity of Under the condition of 60%, the average refractive index (n) represented by the following formula (a) was obtained using a 632.8 nm He—Ne laser.
[0302] Formula (a): n=(n TE...
Synthetic example 1
[0315] "Synthesis Example 1" Synthesis of Cellulose Acetate Propionate
[0316] 150 g of cellulose (hardwood pulp) and 75 g of acetic acid were placed in a 5 L separation flask with a reflux device as a reaction vessel, and vigorously stirred for 2 hours while heating using an oil bath adjusted to 60°C. The cellulose subjected to such a pretreatment is swollen and pulverized so that it becomes fluffy. The reaction vessel was cooled in an ice-water bath at 2°C for 30 minutes.
[0317] Separately, a mixture of 1545 g of propionic anhydride and 10.5 g of sulfuric acid was prepared as an acylating agent, and after cooling to -30° C., it was added all at once to the reaction container containing the above-mentioned pretreated cellulose. After lapse of 30 minutes, the external temperature was gradually increased, and the internal temperature was increased to 25° C. after 2 hours from the addition of the acylating agent. The reaction vessel was cooled using a 5° C. ice-water bath, ...
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Abstract
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