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Active energy ray curable adhesive composition, polarizing film and method for producing same, optical film and image display device

A technology of active energy rays and manufacturing methods, which is applied to the field of active energy ray-curable adhesive compositions, and can solve problems such as poor durability such as crack resistance, reduced transparency of an adhesive layer, and uneven polarizing film.

Active Publication Date: 2015-03-04
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned polarizing film using a water-containing adhesive has a problem that the size of the polarizing film changes due to the heat of the backlight, the polarizing film becomes uneven, and black displays appear whitish on a part of the entire screen. The so-called light leakage (unevenness) becomes remarkable
However, in the combination of the monomers constituting the adhesive, the compatibility between the monomers is relatively low, and phase separation may occur along with this, which may lower the transparency of the adhesive layer, etc.
In addition, the above-mentioned adhesive improves the adhesiveness by softening the cured product (adhesive layer) (decreases Tg), and may deteriorate durability such as crack resistance.

Method used

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  • Active energy ray curable adhesive composition, polarizing film and method for producing same, optical film and image display device
  • Active energy ray curable adhesive composition, polarizing film and method for producing same, optical film and image display device
  • Active energy ray curable adhesive composition, polarizing film and method for producing same, optical film and image display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～9、 comparative example 1～2

[0247] According to the compounding table of Table 2, each component was mixed, and it stirred at 50 degreeC for 1 hour, and obtained the active energy ray-curable adhesive composition of Examples 1-9 and Comparative Examples 1-2. The numerical value in the table shows the weight% when the total amount of the composition is 100 weight %. It should be noted that in Example 4, if the total composition is converted to 100% by weight, the radically polymerizable compound (A) is 20.10% by weight, and the radically polymerizable compound (B) is 58.29% by weight. The radical polymerizable compound (C) is 20.10% by weight, and the photoradical polymerizable initiator (general formula (2)) is 1.51% by weight.

[0248] The compatibility of the adhesive composition was evaluated based on the following conditions. The ingredients used are as follows.

[0249] (1) Radical polymerizable compound (A)

[0250] HEAA (Hydroxyethyl acrylamide), SP value 29.6, Tg of homopolymer 123℃, manufactured by ...

Embodiment 10～24

[0303] According to the compounding table described in Table 3, the components were mixed and stirred at 50°C for 1 hour, and the active energy ray-curable adhesive compositions of Examples 10 to 24 were obtained by the same method as in Examples 1 to 9. The numerical value in the table shows the weight% when the total amount of the composition is 100 weight %. The adhesion, water resistance (warm water immersion test), and durability (thermal shock test) of the obtained polarizing films were evaluated under the same conditions as the above-mentioned measurement conditions. The adhesive strength (water resistance evaluation) after warm water immersion was measured under the following measurement conditions.

Embodiment 10A and 11A

[0305] Before the coating process, both sides of the polarizer (the side bonded with the transparent protective film) were corona treated, except that the same active energy ray curable adhesive composition as in Examples 10 and 11 was used to produce a polarizing film , The same evaluation as in Examples 10 and 11 was performed.

[0306]

[0307] Cut the polarizing film into a size of 200 mm in the direction parallel to the stretching direction of the polarizer and 15 mm in the orthogonal direction. Between the transparent protective film (acrylic resin film) and the polarizer, make a cut with a cutter, The polarizing film is attached to the glass plate. After immersing the polarizing film in warm water at 40°C for 2 hours, within 30 minutes after taking it out (in a non-dried state), use a Tensilon tensile tester to separate the protective film and the protective film in a 90-degree direction at a peeling speed of 300 mm / min. The polarizing plate was peeled, and the peel stren...

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Abstract

An active energy ray curable adhesive composition comprises radical polymerizable compounds (A), (B) and (C), as curable components, the composition being characterized by containing, when the total amount of the composition is 100 weight%, the radical polymerizable compound (A) having an SP value of 29.0 (kJ / m3)1 / 2 to 32.0 (kJ / m3)1 / 2 in an amount of 1.0 to 30.0 weight%, the radical polymerizable compound (B) having an SP value of 18.0 (kJ / m3)1 / 2 or more and less than 21.0 (kJ / m3)1 / 2 in an amount of 35.0 to 98.0 weight%, and the radical polymerizable compound (C) having an SP value of 21.0 (kJ / m3)1 / 2 to 23.0 (kJ / m3)1 / 2 in an amount of 1.0 to 30.0 weight%.

Description

Technical field [0001] The present invention relates to an active energy ray curable adhesive composition for forming an adhesive layer for bonding two or more members, and in particular to an active energy ray curable adhesive composition for forming an adhesive layer of a polarizer and a transparent protective film Object, polarizing film and manufacturing method thereof. The polarizing film can be used alone or in the form of an optical film laminated with the polarizing film to form image display devices such as liquid crystal display devices (LCD), organic EL display devices, CRTs, and PDPs. Background technique [0002] For clocks, mobile phones, PDAs, notebook computers, personal computer monitors, DVD players, TVs, etc., liquid crystal display devices are rapidly developing in the market. The liquid crystal display device is a device that makes the polarization state caused by the switching of the liquid crystal visible, and uses a polarizing plate according to its displ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J4/00C09J4/02C09J5/00C09J11/06G02B5/30C09J7/22C09J7/30
CPCC09J4/00C09J2203/318C09J7/0239G02B5/3025C09J2433/00C09J2205/31C09J7/22C09J7/30G02B1/14C09J2301/416C09J11/06G02B1/18G02B1/12G02B5/3033
Inventor 乾州弘齐藤武士冈本美纪品川雅姜太艳冈田康彰
Owner NITTO DENKO CORP
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