Tackifying agent and image display device using this adhesive

An image display panel and adhesive technology, applied in the direction of adhesive types, ester copolymer adhesives, film/sheet adhesives, etc., can solve problems such as easy generation of air bubbles, and achieve height difference followability , Excellent operability

Active Publication Date: 2015-11-18
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When printing on the peripheral part, there will be a height difference of about 10 μm to about several tens of μm at the boundary of the printed part, and when using a sheet-like adhesive as an interlayer filler, air bubbles may easily occur in the printed height difference. question

Method used

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  • Tackifying agent and image display device using this adhesive
  • Tackifying agent and image display device using this adhesive

Examples

Experimental program
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Effect test

preparation example Construction

[0036] When preparing the above-mentioned acrylic polymer, a polymerization initiator such as a photopolymerization initiator (photoinitiator) or a thermal polymerization initiator can be used depending on the type of polymerization reaction. The polymerization initiators may be used alone or in combination of two or more. The usage-amount of a photoinitiator is not specifically limited, For example, 0.01-0.5 weight part is preferable with respect to 100 weight part of total monomer components which form an acrylic base polymer, More preferably, it is 0.05-0.3 weight part.

[0037] The molecular weight of the base polymer can be appropriately adjusted. For example, the weight average molecular weight in terms of polystyrene is about 50,000 to about 2 million, preferably about 70,000 to about 1.8 million.

[0038] In the pressure-sensitive adhesive of the present invention, the above-mentioned base polymer may have a cross-linked structure as necessary. Formation of a crosslin...

Embodiment

[0067] Examples and comparative examples are given below for further description, but the present invention is not limited to these examples.

Synthetic example 1

[0070] 2-ethylhexyl acrylate (2EHA) of 75 parts by weight, N-vinylpyrrolidone (NVP) of 25 parts by weight, 0.2 Parts by weight of azobisisobutyronitrile (AIBN) as a polymerization initiator and 233 parts by weight of ethyl acetate were passed through with nitrogen, and nitrogen replacement was performed for about 1 hour while stirring. Then, the flask was heated to 70° C. and reacted for 5 hours to obtain an acrylic polymer having a weight average molecular weight (Mw) of 800,000 (hereinafter, this base polymer is referred to as “polymer 1”).

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Abstract

The tackifying agent of the present invention contains an acrylic base polymer and a hydrolyzable terpene phenol resin with a softening point of 70°C to 150°C. The hydrolyzable terpene phenol resin preferably has a terpene molar ratio of 0.1 to 0.7. The amount of acrylic base polymer is preferably 45 to 95 weight parts in 100 weight parts of the total amount of the tackifying agent composition. Furthermore, the total amount of the acrylic base polymer and the hydrolyzable terpene phenol resin is preferably 14 weight parts or more. The tackifying agent of the present invention does not easily become cloudy even under high temperature high humidity conditions, and has step tracking properties, and therefore can be used by placing between a front surface transparent plate and a touch panel, between a front surface transparent plate and an image display panel, or between a touch panel and an image display panel.

Description

technical field [0001] The present invention relates to an adhesive used in forming an image display device having a transparent plate or a touch panel on the front of an image display panel. In addition, the present invention relates to a method of manufacturing an image display device using the adhesive. Background technique [0002] Liquid crystal display devices and organic electroluminescence (EL) display devices are widely used as various image display devices such as mobile phones, car navigation devices, monitors for computers, and televisions. In order to prevent damage to the image display panel due to impact from the outer surface of the image display panel (liquid crystal panel or organic EL panel), sometimes a front display plate such as a transparent resin plate or a glass plate is provided on the visible side of the image display panel. (also known as the "window layer"). In addition, in a display device having a touch panel, the touch panel is generally dis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J133/00C09J11/00G02F1/1333G02F1/1335G09F9/00
CPCC09J11/00C08F220/18C09J133/08G09F9/00C09J2203/318C09J7/385C08F220/1808G06F3/0414C08F226/08C08F220/14C08F220/20C09J133/14C09J165/00
Inventor 水谷昌纪长谷川由纪茂手木佑辅宝田翔山本真也疋田贵巳
Owner NITTO DENKO CORP
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