Adhesive composition, adhesive layer and adhesive sheet

A technology of adhesive layer and composition, which is applied in the direction of non-polymer adhesive additives, adhesive types, adhesive additives, etc., and can solve problems such as poor processability, stringing, and adhesive adhesion to cutting knives

Active Publication Date: 2017-03-29
SOKEN CHEM & ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such an adhesive layer has problems such as the adhesive sticking to the cutter or stringing during cutting, and the workability is poor.
Therefore, it is difficult to balance the step followability and processability of the adhesive layer

Method used

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  • Adhesive composition, adhesive layer and adhesive sheet
  • Adhesive composition, adhesive layer and adhesive sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0170] 39 parts of 2-ethylhexyl methacrylate (2-EHMA), 35 parts of lauryl methacrylate (LMA), 2 parts of acrylic acid-2 - 20 parts of ethylhexyl ester (2-EHA), 5 parts of 2-hydroxyethyl acrylate (2-HEA), 1 part of acrylamide (AM) and 70 parts of ethyl acetate solvent, while introducing nitrogen, the temperature was raised to 80 ℃. Next, 0.3 parts of azobisisobutyronitrile (AIBN) was added, and polymerization reaction was performed at 80° C. for 8 hours under a nitrogen atmosphere. After completion of the reaction, it was diluted with ethyl acetate to prepare a polymer solution having a solid content concentration of 50% by mass. The obtained (meth)acrylic copolymer had a weight average molecular weight (Mw) of 380,000 and a molecular weight distribution (Mw / Mn) of 7.5.

[0171] The obtained (meth)acrylic copolymer solution (solid content concentration: 50% by mass) was mixed with 0.4 parts of HDI-based isocyanate relative to 100 parts (solid content) of the (meth)acrylic cop...

Embodiment 2～7、 comparative example 1～4

[0174] Except having used the monomer component described in Table 1, it carried out similarly to Example 1, and obtained the (meth)acrylic-type copolymer solution. Next, except having replaced the (meth)acryl-type copolymer solution as described in Table 1, it carried out similarly to Example 1, and obtained the adhesive sheet which has the adhesive composition and the adhesive layer of thickness 50 micrometers.

[0175] [Table 1]

[0176]

[0177] As shown in Table 1, if the storage modulus (25°C) of the adhesive layer is 0.8×10 5 Above Pa, and the storage modulus (80°C) is 5.0×10 4 Pa or less, the step followability and the cutting property are excellent. On the other hand, as shown in Comparative Examples 1 and 2, if the storage modulus (80°C) of the adhesive layer exceeds 5.0×10 4 Pa, the step followability is poor. As shown in Comparative Examples 3 and 4, if the storage modulus (25° C.) of the adhesive layer is less than 0.8×10 5 Pa, the cutting property is poor....

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Abstract

The present invention provides an adhesive composition capable of forming an adhesive layer excellent in step followability and workability. It can follow it without generating air bubbles, etc., and the processability means that the adhesive will not adhere to the scissors or be drawn when cutting. The adhesive composition of the present invention contains (A) a (meth)acrylic copolymer and (B) an isocyanate compound, and is characterized in that the adhesive layer formed from the adhesive composition has an The storage modulus is not less than 0.8×105Pa, and the storage modulus at 80°C is not more than 5.0×104Pa.

Description

technical field [0001] The present invention relates to an adhesive composition excellent in step followability and processability, an adhesive layer formed using the adhesive composition, and an adhesive sheet having the adhesive layer. Background technique [0002] In recent years, image display devices such as liquid crystal display devices and input devices such as touch panels used in combination with the image display devices have become increasingly widely used. In the manufacturing process of these image display devices and input devices, a pressure-sensitive adhesive sheet having a pressure-sensitive adhesive layer is used when bonding the constituent members. [0003] For example, in a liquid crystal display device, a front transparent plate such as a glass plate is provided on the side closer to the viewer than the display panel via an adhesive layer. On the other hand, in order to display a specific frame or figure around an image to improve appearance, a printe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J133/08C09J133/10C09J11/06C09J7/02
CPCC09J4/00C09J7/385C09J9/00C09J133/08C09J133/10C09J2203/318C09J2301/312G06F3/041
Inventor 清水政一木口贵美子
Owner SOKEN CHEM & ENG CO LTD
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