Active energy beam-cured composition for optical film, optical film, polarizer protective film, and polarizing plate

An active energy ray, optical film technology, used in optics, polarizing elements, nonlinear optics, etc., can solve the problem of small photoelastic coefficient of optical films, and achieve excellent viewing angle characteristics, heat resistance and adhesion. Effect

Inactive Publication Date: 2014-09-03
TOAGOSEI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Patent Document 3 discloses that an optical film formed of urethane (meth)acrylate has a small photoelastic coefficient

Method used

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  • Active energy beam-cured composition for optical film, optical film, polarizer protective film, and polarizing plate
  • Active energy beam-cured composition for optical film, optical film, polarizer protective film, and polarizing plate
  • Active energy beam-cured composition for optical film, optical film, polarizer protective film, and polarizing plate

Examples

Experimental program
Comparison scheme
Effect test

manufacture example A1

[0367] ○Manufacturing example A1 (production of (A) component)

[0368] Into a 500mL reaction vessel equipped with a stirrer, a thermometer, and a condenser, 145.9g of IPDI as an isocyanate and 0.07g of dibutyltin dilaurate as a catalyst were added at room temperature (25°C, the same below), and contained 5% by volume of oxygen In a nitrogen atmosphere, these were heated while stirring until the liquid temperature reached 70°C.

[0369] 43.0 g of polycarbonate diol (Duranol T-5651 manufactured by Asahi Kasei Chemicals Co., Ltd., number average molecular weight: 1,000) and 33.5 g of 1,4-butanediol were added dropwise so that the internal temperature became 75° C. or lower. g and 65.0 g of methyl ethyl ketone (hereinafter also referred to as "MEK"), and reacted at an internal temperature of 80° C. for 2 hours.

[0370] Thereafter, 57.6 g of 2-hydroxyethyl acrylate (hereinafter also referred to as "HEA") and 2,6-di-tert-butyl-4-methanol as a polymerization inhibitor were added...

manufacture example A2

[0373] ○Manufacturing example A2 (production of (A) component)

[0374] IPDI as the isocyanate in Production Example A1 was set to 127.8 g, and as the alcohol solution, 37.6 g of Duranol T5651, tricyclic [5.2.1.0 2，6 ] a mixed solution of 64.1 g of decane dimethanol (TCDDM manufactured by Oxcea Co., Ltd.) and 65.0 g of MEK, and HEA was set to 50.5 g, except that, the same operation was carried out as in Production Example A1, and the carbamic acid containing MEK solution (solid content 80%) of ester acrylate (hereinafter referred to as "UA-2").

[0375] The Mw and photoelastic coefficient 1 of the obtained UA-2 were measured in the same manner as in Production Example A1. As a result, the Mw was 2,300 and the photoelastic coefficient 1 was 9.7×10 -12 Pa -1 .

manufacture example A3

[0376] ○Manufacturing example A3 (production of (A) component)

[0377] IPDI as the isocyanate in Production Example A1 was set to 151.4 g, and as the alcohol solution, polycaprolactone triol (manufactured by Daicel Chemical Industry Co., Ltd.) Plaxcel303, number average molecular weight 300) 18.3 g, 20.4 g Duranol A mixed solution of T5651, 28.2 g of 1,4-butanediol, and 65.0 g of MEK, except that HEA was set to 61.6 g, was performed in the same manner as Production Example A1 to obtain acrylic acid containing urethane MEK solution (solid content: 80%) of ester (hereinafter referred to as "UA-3").

[0378] The Mw and photoelastic coefficient 1 of the obtained UA-3 were measured in the same manner as in Production Example A1. As a result, the Mw was 2,400 and the photoelastic coefficient 1 was 13.5×10 -12 Pa -1 .

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Abstract

[Problem] To provide: an active energy beam-curable composition for optical films that combines a low photoelastic coefficient and low retardation, good resistance to moist heat, and outstanding flexibility; an optical film obtained using said composition; a polarizer protective film; and a polarizing plate. [Solution] An energy beam-curable composition for forming optical films, containing: (A) urethane (meth)acrylate (A) having a photoelastic coefficient at 23°C when cured (hereinafter merely referred to as the "photoelastic coefficient") not exceeding 30 x 10-12Pa-1, and (B) a polymer other than the component (A) and which has a photoelastic coefficient not exceeding 5 x 10-12Pa-1. The photoelastic coefficient when cured does not exceed 10 x 10-12Pa-1, in-plane retardation at the front and at a diagonal of 40° and total retardation in the thickness direction when cured as measured at a thickness of 40mum does not exceed 5nm.

Description

technical field [0001] The present invention relates to an active energy ray-curable composition for forming an optical film, an optical film obtained by curing the composition, and a polarizing plate using the optical film as a polarizer protective film, and belongs to these technical fields. [0002] It should be noted that the "optical film" in the present invention means "optical film or sheet", and its thickness is not particularly limited. In addition, acrylate or methacrylate is shown as (meth)acrylate. Background technique [0003] In recent years, along with the increase in size of liquid crystal displays, it is also necessary to increase the size of optical films such as polarizer protective films and retardation films for optically compensating liquid crystals. [0004] However, when the size of the optical film is increased, unevenness of the external force will occur. Therefore, when the optical film is formed of a material that easily changes the birefringence...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F290/06C08J5/18G02B5/30G02F1/1335
CPCC08G18/755C08G18/672C08G18/4277C08J5/18C08F290/06C08G18/3212C08G18/3206G02B5/30C08G18/4202C08G18/44
Inventor 谷内健太郎竹本贵之望月克信加藤久雄
Owner TOAGOSEI CO LTD
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