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Light Guide Plate and Method for Fabricating the Same

A light guide plate, aromatic technology, applied in the field of manufacturing the light guide plate, can solve problems such as side reactions, achieve the effects of reducing color deviation, thermal stability and reliability

Active Publication Date: 2015-07-01
LOTTE ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method also causes side reactions due to the long-term use of additives under high temperature and high humidity conditions

Method used

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  • Light Guide Plate and Method for Fabricating the Same
  • Light Guide Plate and Method for Fabricating the Same
  • Light Guide Plate and Method for Fabricating the Same

Examples

Experimental program
Comparison scheme
Effect test

preparation Embodiment 1

[0069] Preparation Example 1: Preparation of Aromatic Polycarbonate Resin

[0070] 2,2-bis(4-hydroxyphenyl)propane ("bisphenol A", BPA), diphenyl carbonate (DPC), and 150 ppb KOH as catalyst (refer to the number of moles of bisphenol A) as listed in Table 1 The obtained content ratio (molar ratio) was placed sequentially, followed by removal of oxygen with nitrogen. Then, the reactor was heated to 160°C, heated again to 190°C, and the reaction was performed for 6 hours. After 6 hours, the reactor was heated again to 210°C and maintained at 100 Torr for 1 hour. Then, the reactor was heated again to 260° C. and maintained at 20 Torr for 1 hour, then depressurized to 0.5 Torr and maintained for 1 hour, thereby preparing an aromatic polycarbonate resin (yield: 99.9%). The weight average molecular weight, terminal hydroxyl group content, melt index (MI) and spiral flow of the prepared aromatic polycarbonate resins were measured, and the results are shown in Table 1.

preparation Embodiment 2

[0071] Preparation Example 2: Preparation of Aromatic Polycarbonate Resin

[0072] An aromatic polycarbonate resin was prepared in the same manner as in Preparation Example 1 (yield: 99.9%), except that the amounts of 2,2-bis(4-hydroxyphenyl)propane and diphenyl carbonate were listed in Table 1 Adjustment. The weight average molecular weight, terminal hydroxyl group content, melt index (MI) and helical flow of the prepared aromatic polycarbonate resins were measured, and the results are shown in Table 1.

preparation Embodiment 3

[0073] Preparation Example 3: Preparation of Aromatic Polycarbonate Resin

[0074] An aromatic polycarbonate resin was prepared in the same manner as in Preparation Example 1 (yield: 99.9%), except that the amounts of 2,2-bis(4-hydroxyphenyl)propane and diphenyl carbonate were listed in Table 1 Adjustment. The weight average molecular weight, terminal hydroxyl group content, melt index (MI) and helical flow of the prepared aromatic polycarbonate resins were measured, and the results are shown in Table 1.

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Abstract

Disclosed herein is a light guide plate formed by injection molding of an aromatic polycarbonate resin that is a polymer of an aromatic dihydroxy compound and a diaryl carbonate. The aromatic dihydroxy compound and the diaryl carbonate are present in a mole ratio of about 1:1.02 to about 1:1.35, and the aromatic polycarbonate resin has a weight average molecular weight from about 10,000 g / mol to about 18,000 g / mol and includes about 5 mol % to about 30 mol % of terminal hydroxyl groups relative to total moles of terminal groups. The light guide plate formed of the aromatic polycarbonate resin can reduce a yellowing phenomenon upon injection molding, can exhibit low color deviation under high temperature and high humidity conditions, and can secure excellent properties in terms of discoloration resistance, and brightness quality (brightness uniformity), and the like.

Description

[0001] Cross-references to related applications [0002] This application claims priority and benefit from Korean Patent Application No. 10-2013-0164309 filed on December 26, 2013 under 35USC Chapter 119, the entire disclosure of which is hereby incorporated by reference. technical field [0003] The present invention relates to a light guide plate and a manufacturing method thereof. More specifically, the present invention relates to a light guide plate, which uses a specific aromatic polycarbonate resin to suppress yellowing after injection molding, and can reduce color deviation under high temperature and high humidity conditions while improving discoloration resistance, brightness Quality (brightness uniformity) and the like ensure excellent performance, as well as the method for manufacturing the light guide plate. Background technique [0004] Since the liquid crystal screen of a liquid crystal display (LCD) is not self-emitting, a mirror is placed behind the liquid c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L69/00C08G64/06C08G64/30B29C45/76G02B6/00G02B1/04
CPCG02B6/0035C08G64/06B29C45/0001G02B6/0065B29D11/00663G02B6/0046B29K2069/00C08G64/307
Inventor 池俊镐崔祐锡许宗赞李恩别崔圭汎
Owner LOTTE ADVANCED MATERIALS CO LTD
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