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Protective film for polarizer and process for producing the same, polarizer and process for producing the same, and liquid-crystal display

一种制造方法、偏振片的技术，应用在液晶材料、偏振元件、化学仪器和方法等方向，能够解决技术不充分等问题

Inactive Publication Date: 2011-07-27
KONICA MINOLTA OPTO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, according to recent LCD TVs, a wider fiber-based ester film is required, not only these technologies are not sufficient, but of course, a better forming method is desired

Method used

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  • Protective film for polarizer and process for producing the same, polarizer and process for producing the same, and liquid-crystal display
  • Protective film for polarizer and process for producing the same, polarizer and process for producing the same, and liquid-crystal display
  • Protective film for polarizer and process for producing the same, polarizer and process for producing the same, and liquid-crystal display

Examples

Experimental program
Comparison scheme
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Embodiment

[0402] The following examples will be given to describe the present invention concretely, but the present invention is not limited thereto.

[0403] Cellulose esters C-1 to C-7, plasticizers and additives used in Examples 1 to 4 were synthesized according to Synthesis Examples 1 to 14 below.

Synthetic example 1

[0404] (Synthesis Example 1: Cellulose Ester C-1)

[0405] Synthesis was carried out referring to Example B of JP-A-6-501040.

[0406] Prepare the following solutions A-E.

[0407] A: propionic acid: concentrated sulfuric acid = 5:3 (mass ratio)

[0408] B: Acetic acid: pure water = 3:1 (mass ratio)

[0409] C: Acetic acid: pure water = 1:1 (mass ratio)

[0410] D: Acetic acid: pure water: magnesium carbonate = 12:11:1 (mass ratio)

[0411] E: An aqueous solution in which 0.5 moles of potassium carbonate and 1.0 moles of citric acid are dissolved in 14.6 kg of pure water

[0412] 100 parts by mass of cellulose purified from cotton, 317 parts by mass of acetic acid, and 67 parts by mass of propionic acid were added to a reactor equipped with a mechanical stirrer, and stirred at 55° C. for 30 minutes. After reducing the temperature of the reactor to 30° C., 2.3 parts by mass of the solution A was added and stirred for 30 minutes. After cooling the reactor temperature to -2...

Synthetic example 2

[0422] (Synthesis Example 2: Cellulose Ester C-2)

[0423] 70 g of acetic acid (corresponding to fatty acid I) and 20 g of propionic acid (corresponding to fatty acid II) were added to 30 g of cellulose (manufactured by Nippon Paper Co., Ltd., dissolving pulp), and stirred at 54° C. for 30 minutes. After the mixture was cooled, 8 g of acetic anhydride (corresponding to fatty acid anhydride I), 125 g of propionic anhydride (corresponding to fatty acid anhydride II), and 1.2 g of sulfuric acid were added and esterified in an ice bath. Stirring was performed for 150 minutes, adjusting temperature so that it might not exceed 40 degreeC during esterification. After the reaction was terminated, a mixed solution of 30 g of acetic acid and 10 g of water was added dropwise over 20 minutes to hydrolyze the excess anhydride. While maintaining the temperature of the reaction liquid at 40°C, 90 g of acetic acid and 30 g of water were added, and stirred for 1 hour. The mixture was added t...

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Abstract

The invention provides a protective film for polarizers which comprises a cellulose ester film and which, even when stored for long, suffers no film deformation failures such as ridging or protrusion failures; a process for producing the protective film; a polarizer; a process for producing the polarizer; and a liquid-crystal display employing the polarizer. The process for producing a protective film for polarizers is characterized by forming a melt comprising a cellulose ester and at least one member selected among compounds respectively represented by the following general formulae (1) to (3) into a continuous cellulose ester film by melt casting and winding the film into a roll. In the formula (1), R1 to R5 each represents a substituent. In the formula (2), R1 to R6 each represents a substituent. In the formula (3), Rf represents perfluoroalkyl, Rc represents alkylene, Z represents a nonionic polar group, n is 0 or 1, and m is an integer of 1-3.

Description

technical field [0001] The present invention relates to a polarizing plate protective film and a manufacturing method thereof, a polarizing plate and a manufacturing method thereof, and a liquid crystal display device using the polarizing plate. Background technique [0002] In recent years, we have been developing thin and lightweight portable computers, large screens, and high-definition. Along with this, the protective film for liquid crystal polarizing plates is also strongly required to be thinner, larger in size, and higher in quality. A general cellulose ester film is widely used as a polarizing plate protective film. The cellulose ester film is usually wound on a core to form a film roll for storage and transportation. [0003] These cellulose ester films have, heretofore, been manufactured using a specialized solution casting method. The solution casting method refers to a film forming method in which a solution of cellulose ester dissolved in a solvent is cast t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/1335G02B5/30B29C48/08
CPCB29K2001/00B29C2043/3433G02F1/133528B29C43/24B29K2001/12B29C47/0021C08B3/16B29C43/52C08L1/14B29C33/04B29C55/08C08B3/18B29C43/222B29C43/46B29C47/14G02B1/105B29C48/08B29C48/305Y10T156/10G02B1/14C09K2323/031G02B5/30C09K19/02G02F1/1335
Inventor 川边里美中村和明
Owner KONICA MINOLTA OPTO
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