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Cellulose esters with a high hydroxyl content and their use in liquid crystal displays

A liquid crystal display, cellulose technology, applied in instruments, polarizing elements, optical elements, etc., can solve the problems of yield loss, complex processing steps, etc.

Inactive Publication Date: 2010-03-24
EASTMAN CHEM CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] To use cellulose esters in LCD applications, complex processing steps are generally required and each of those steps creates a chance for film cracks that introduce errors or lead to yield loss

Method used

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  • Cellulose esters with a high hydroxyl content and their use in liquid crystal displays
  • Cellulose esters with a high hydroxyl content and their use in liquid crystal displays
  • Cellulose esters with a high hydroxyl content and their use in liquid crystal displays

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-20 and comparative example 21-23

[0320] The cellulose ester dopant was prepared by adding cellulose esters (such as CAB-381-20, CAP-482-20, CAP-141-20, all commercially available from Eastman Chemical Company, Kingsport, Tennessee) to To a suitable reaction vessel (eg, a 1000 mL 3-necked round bottom flask equipped with overhead stirrer and thermocouple and temperature controller) containing a mixture of acetic acid, propionic acid, butyric acid and water. The mixture is stirred and heated to a suitable temperature, typically 40°C to 85°C, until the cellulose ester is dissolved and a clear, viscous mixture results. A catalyst mixture comprising sulfuric acid, butyric acid and / or propionic acid and acetic acid is added to the cellulose ester dope. The hydrolysis mixture comprising butyric acid and / or propionic acid, acetic acid, water and optionally sulfuric acid is added in a suitable manner (for example, dropwise, in portions, in the form of a steady stream, or in a single addition) to Cellulose ester dopan...

Embodiment 13-14

[0335] The CAP adulterant was prepared by dissolving 250 grams (about 319.67 g / mol, 0.78 mol, based on anhydroglucose units, Eastman Chemical Company, batch #BP-04951-B) of CAP-482-20, 1226.6 Grams (20.43 mol) of acetic acid were added to a 5000 ml 3-neck round bottom flask equipped with an overhead stirrer and a thermocouple connected to a J-Kem temperature controller and the mixture was stirred at 55 °C until the solids dissolved into a clear dopant or Slightly cloudy viscous mixture. The blend was allowed to cool to room temperature with stirring overnight. The dope was heated to 70°C and a catalyst solution comprising 253.6 grams (14.07 mol) of demineralized water and 3.775 grams (0.038 mol) of sulfuric acid was added to the CAP dope. A hydrolysis solution comprising 695 grams (11.57 mol) of acetic acid, 695 grams (38.61 mol) of demineralized water was added to the dropping funnel and then added dropwise to the CAP dopant / catalyst solution mixture. Care was taken to add ...

Embodiment 15-16

[0340] The CAP adulterant was prepared by dissolving 250 grams (about 319.67 g / mol, 0.78 mol, based on anhydroglucose units, Eastman Chemical Company, batch #BP-04951-B) of CAP-482-20, 1226.6 Grams (13.92 mol) of butyric acid were added to a 5000 ml 3-neck round bottom flask equipped with an overhead stirrer and a thermocouple connected to a J-Kem temperature controller and the mixture was stirred at 55°C until the solids dissolved into a clear adulterant Or slightly cloudy viscous mixture. The blend was allowed to cool to room temperature with stirring overnight. The dope was heated to 70°C and a catalyst solution comprising 96.4 grams of butyric acid (1.09 mol) and 3.775 grams (0.038 mol) of sulfuric acid was added to the CAP dope. A hydrolysis solution comprising 1200 grams (19.98 mol) of acetic acid, 1200 grams (66.59 mol) of demineralized water was added to the dropping funnel and then added dropwise to the CAP dopant / catalyst solution mixture. Care was taken to add the...

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Abstract

The invention relates to the preparations and uses of cellulose esters with a high degree of substitution of hydroxyl groups (also called high DSoh cellulose esters from 0.40 to 2.00 as substrates and / or negative C-plate optical compensation films in LCD applications.

Description

Background technique [0001] This invention relates to high hydroxyl content cellulose esters. More specifically, the present invention relates to cellulose esters with high hydroxyl content, methods for preparing cellulose esters with (high) hydroxyl content, and uses of cellulose esters with high hydroxyl content in liquid crystal displays. [0002] Citations to Joint Research Agreements [0003] A Joint Research Agreement between Eastman Chemical Company and APS Corporation was in effect prior to the date this invention was made and this invention is the result of activities undertaken within the scope of the Joint Research Agreement. Background technique [0004] The importance of cellulose esters in LCD applications is unquestionable. Cellulose esters are commonly used in LCDs. The most common application of cellulose esters in LCDs is as a substrate or protective layer (for polarizers). Cellulose ester-type substrates are used in several applications, most notably p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18G02F1/1335G02B5/30
CPCC08J2301/12C08B3/16C08L1/14G02B5/30C08B3/08C08L1/12C08J2301/14C08B3/06G02F1/13363C08K5/0016C08B3/18C08J5/18G02F2413/11C09K2323/00G02F1/133634G02B5/3083C08L2203/16
Inventor M·C·谢尔顿T·C·格姆罗思张东F·W·哈里斯
Owner EASTMAN CHEM CO
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