Ultraviolet ray-curable adhesive agent, cured product, and adhesive sheet

A curing type, adhesive technology, applied in the direction of adhesive types, polyurea/polyurethane adhesives, polymer adhesive additives, etc., can solve problems such as insufficient low-temperature flexibility and increased glass transition temperature , to achieve the effect of excellent durability, good adhesion and excellent softness

Active Publication Date: 2019-02-01
ARAKAWA CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as in Patent Document 1, since a large amount of solvent is contained, a solvent removal process is required, and the glass transition temperature of the monomer having an aliphatic cyclic substituent having 4 to 10 carbon atoms is high, making the glass of the polymer The transition temperature also increases, and as a result, the low-temperature flexibility is insufficient

Method used

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  • Ultraviolet ray-curable adhesive agent, cured product, and adhesive sheet
  • Ultraviolet ray-curable adhesive agent, cured product, and adhesive sheet
  • Ultraviolet ray-curable adhesive agent, cured product, and adhesive sheet

Examples

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Embodiment

[0097] Hereinafter, the present invention will be specifically described by way of examples and comparative examples. However, it goes without saying that the technical scope of the present invention is not limited by these examples. "Parts" and "%" in the examples are based on mass unless otherwise specified.

[0098] In each manufacture example, the weight average molecular weight of (A) component is the polystyrene conversion value by gel permeation chromatography, and measurement conditions are as follows.

[0099] Measuring device main body: product name "HLC-8220GPC", manufactured by Tosoh Corporation

[0100] Column: product name "TSKGel G1000H", "TSKGel G2000H", both manufactured by Tosoh Corporation

[0101] Developing solvent: tetrahydrofuran

manufacture example 1-1

[0103] 884 parts of polypropylene glycol (manufactured by ADEKA Corporation, trade name "Adeka Polyester P-2000") (hereinafter referred to as PPG2000) with a number average molecular weight of 2000 (hereinafter referred to as PPG2000) was added to a reaction device equipped with a condenser tube, a stirrer, and a nitrogen gas introduction tube. 106 parts of ketone diisocyanate (hereinafter referred to as IPDI), 333 parts of 2-ethylhexyl acrylate (hereinafter referred to as 2-EHA) and 0.4 part of tin octoate, after heating up to 80°C and keeping it warm for 3 hours, the intermediate 2-EHA solution of isocyanate-terminated urethane prepolymer. Next, 10 parts of 4-hydroxybutyl acrylate (hereinafter referred to as 4HBA) was added, and kept at 80°C for 2 hours, and the completion of the reaction was confirmed by NCO measurement, thereby obtaining a weight-average molecular weight of 55,000 and an average value of (meth)acryloyl groups. The 2-EHA solution of the urethane acrylate (h...

manufacture example 1-2

[0105] Add 910 parts of PPG2000, 82 parts of hexamethylene diisocyanate (hereinafter referred to as HDI), 333 parts of 2-EHA and 0.4 parts of tin octoate to the same reaction device as in Manufacturing Example 1-1, and heat up to 80°C and keep it warm for 3 After hours, a 2-EHA solution of the isocyanate-terminated urethane prepolymer was obtained as an intermediate. Next, 8 parts of 2-hydroxyethyl acrylate (hereinafter referred to as HEA) were added, and kept at 80°C for 2 hours, and the completion of the reaction was confirmed by NCO measurement, thereby obtaining a weight-average molecular weight of 57,000 and an average of (meth)acryloyl groups. 2-EHA solution of urethane acrylate (henceforth (A-2) component) whose number is 2.0.

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Abstract

The invention relates to an ultraviolet ray-curable adhesive agent, a cured product, and an adhesive sheet. An ultraviolet ray-curable adhesive agent having no solvent in nature is provided. Even if asingle adhesive layer has good flexibility under lower temperature and indoor temperature, and has good adhesiveness to base material like COP with low polarity. The adhesive comprises polyether polyol (a1), polyisocyanate (a2), monomethyl acrylate (a3) containing hydroxyl or polyurethane (methyl) acrylate (A) having reactant of monomethyl acrylate containing isocyanate group, polymer monomer (B)having no hydroxyl group whose vitrification conversion temperature is above -70 DC and lower than 0DC at the time of forming homopolymer, monomethyl acrylate (C) having hydroxyl group, photopolymerization initiator (D), and viscosity resin (E) which is selected from at least one of petroleum resin having hydroxy group, dismuted rosin resin and hydrogenated rosin resin with softening point being100-150 DC.

Description

technical field [0001] The present invention relates to an ultraviolet curable adhesive, a cured product, and an adhesive sheet. Background technique [0002] Digital information equipment such as mobile phones, portable game consoles, and car navigation systems are equipped with display devices such as touch panels, and optical components such as liquid crystal elements, light-emitting diode elements, and organic electroluminescent elements are often used in the display devices. [0003] In recent years, emphasis has been placed on designability of touch panels, and there has been an increasing demand for curved surfaces from conventional flat shapes. In addition, film-shaped touch panels have also been studied. For example, flexible organic EL displays can be folded or rolled up in roll form. [0004] The pressure-sensitive adhesive sheet used for the touch panel having these shapes requires high flexibility in the pressure-sensitive adhesive layer, and in particular, a c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/14C09J11/08C09J7/25C09J7/40
CPCC09J7/25C09J7/40C09J11/08C09J175/14C09J2467/005C09J2467/006C09J2203/326C09J2301/122C08L93/04C08L57/02C09J175/08C09J11/06C09J7/20C09J2301/312
Inventor 罗聪
Owner ARAKAWA CHEM IND LTD
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