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Laminated film

A technology for laminating films and base films, applied in coatings, instruments, radiation-absorbing coatings, etc., can solve problems that affect durability and optical properties, and polymerization cannot be properly performed

Active Publication Date: 2021-04-09
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since most polymerizable liquid crystal compounds are UV polymerizable, they are irradiated with UV light during the manufacturing process, where if UV absorbers or photostabilizers are present, polymerization may not proceed properly, adversely affecting durability and optics characteristic

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0156] Preparation Example 1. Preparation of Polymerizable Liquid Crystal Composition A

[0157] A polymerizable liquid crystal composition was prepared using LC1057 liquid crystal of BASF Company as a forward dispersion polymerizable liquid crystal compound and a liquid crystal compound of the following formula A as a reverse dispersion liquid crystal compound. The forward dispersion polymerizable liquid crystal compound has R(450) / R(550) at a level of about 1.09 to 1.11 and R(650) / R(550) at a level of about 0.93 to 0.95, formula A The liquid crystal compound has R(450) / R(550) at a level of about 0.84 to 0.86 and R(650) / R(550) at a level of about 1.01 to 1.03. R(450), R(550) and R(650) are, respectively, for wavelengths of 450 nm, 550 nm and In-plane retardation of light at 650nm. The in-plane retardation can be measured by a known method, for example, it can be measured by polarimetry using Axoscan (Axometrics) as a birefringence meter. A method of forming a retardation l...

preparation example 2

[0183] Preparation Example 2. Preparation of Polymerizable Liquid Crystal Composition B

[0184] A polymerizable liquid crystal composition B was prepared in the same manner as in Preparation Example 1, except that a liquid crystal compound of the following formula B was used as the reverse dispersion polymerizable liquid crystal compound. The liquid crystal compound of formula B has R(450) / R(550) at a level of about 0.81 to 0.83 and R(650) / R(550) at a level of about 1.01 to 1.03. R(450), R(550), and R(650) are in-plane retardations for light of wavelengths of 450 nm, 550 nm, and 650 nm as measured relative to a retardation layer formed by using the polymerizable liquid crystal compound of Formula B alone.

[0185] [Formula B]

[0186]

[0187] Here, the compound of formula B was obtained by obtaining a compound represented by the following formula A9 in the same manner as in Preparation Example 1, and then replacing the hydrogen atom bonded to the nitrogen atom of the com...

preparation example 3

[0191] Preparation Example 3. Preparation of Polymerizable Liquid Crystal Composition C

[0192] A polymerizable liquid crystal composition was prepared by applying: the reverse dispersion polymerizable liquid crystal compound of the formula A in the above Preparation Example 1, the same photoinitiator as that used in Preparation Example 1, and Ultraviolet absorber (Orient Chemical Industries, BONASORBUA-3912) having a maximum absorption wavelength range of about 380 nm to 390 nm. The reverse dispersion polymerizable liquid crystal compound of formula A, the photoinitiator and the ultraviolet absorber are combined in a solvent (ring Pentanone) to prepare polymerizable liquid crystal composition C.

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Abstract

The present application may provide a laminated film comprising a retardation layer exhibiting blocking characteristics against a specific ultraviolet ray even when no ultraviolet absorber or light stabilizer is mixed therein. In addition, the present application may provide a laminated film which: exhibits a constant UV blocking property even in the absence of a UV absorber or light stabilizer, and is thus used alone or in combination, as necessary, with an appropriate UV blocker or light stabilizer; selectively blocks ultraviolet rays in areas requiring blocking without affecting display performance such as color and image quality of a display device; does not need a separate ultraviolet blocking layer and thus may be thinly formed; and has excellent durability.

Description

technical field [0001] This application claims priority based on Korean Patent Application No. 10-2018-0133682 filed on November 2, 2018, the disclosure of which is incorporated herein by reference in its entirety. [0002] This application relates to laminated films. Background technique [0003] In many cases, an optical film included in a display device requires ultraviolet blocking properties and the like for durability and protection of a display element. For this reason, UV absorbers or light stabilizers are incorporated into many optical films. [0004] Commercially available ultraviolet absorbers or photostabilizers can effectively block ultraviolet rays having a wavelength of less than about 380 nm, but have reduced blocking efficiency for ultraviolet rays of 380 nm or greater. In addition, although ultraviolet absorbers or photostabilizers are known to partially block or absorb ultraviolet rays of 380 nm or more, such ultraviolet absorbers or photostabilizers als...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/04C08J5/18G02B5/20G02B1/04C09K19/38C09D7/65
CPCG02B1/04C09K2019/0448C09K19/3497C09K2219/03G02B5/3016C09D5/32C09D4/00C08J7/0427C08J2467/03C08J2400/12C08F222/102C08J7/042C08J5/18G02B5/20C09K19/3823C09D7/65C09D135/02C09K19/3861C09K2323/035
Inventor 尹赫金信英许恩树李知妍朴文洙
Owner LG CHEM LTD
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