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Adhesive and adhesive sheet

A technology of adhesives and compounds, applied in the direction of adhesives, adhesive types, polyurea/polyurethane adhesives, etc., can solve the problems of poor re-peelability, bad conditions, high adhesion, etc., and achieve good re-peelability, Suppresses the increase of adhesion and has good heat resistance

Pending Publication Date: 2022-03-18
TOYO INK SC HOLD CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Acrylic adhesives have excellent adhesive force, but due to high adhesive force, the re-peelability after being attached to the adherend is not good
Regarding silicone-based adhesives, there are also concerns that the adherend is prone to contamination, and the silicone resin with a relatively low molecular weight volatilizes and adsorbs on the surface of electronic components and other equipment, causing problems.

Method used

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  • Adhesive and adhesive sheet
  • Adhesive and adhesive sheet
  • Adhesive and adhesive sheet

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0074] In the adhesive agent according to the first embodiment of the present invention, one or more active hydrogen group-containing compounds (H) contain 50% by mass or more of active hydrogen group-containing groups whose branching degree α measured by the GPC-MALS method is 0.5 or less In the compound (HX), the branching degree α measured by the GPC-MALS method in the hydroxyl-terminated urethane prepolymer (UPH) is 0.2 to 0.6.

[0075] In the adhesive of the first embodiment, since the intramolecular crosslinking reaction proceeds early and predominantly while the intermolecular crosslinking reaction is maintained, the initial curability and exposure to a thermal environment, especially a hot and humid environment The re-peelability (the effect of suppressing the increase in adhesion) is good, and it can achieve both a dense structure formed by intramolecular crosslinking and a sparse structure formed by intermolecular crosslinking, so it can form substrate adhesion and sc...

no. 2 approach

[0083] In the adhesive agent according to the second embodiment of the present invention, one or more active hydrogen group-containing compounds (H) contain 50% by mass or more of active hydrogen group-containing compounds having a branching degree α of more than 0.5 as measured by the GPC-MALS method. In the compound (HY), the branching degree α measured by the GPC-MALS method in the hydroxy-terminated urethane prepolymer (UPH) exceeds 0.6 and is 0.8 or less.

[0084] In the adhesive of the second embodiment, since the crosslinked structure is formed at an early stage by the moderate branched structure contained in the hydroxy-terminated urethane prepolymer (UPH), it is possible to form initial curability and exposure to heat An adhesive layer with good re-peelability (effect of suppressing increase in adhesive force) in an environment, especially a hot and humid environment. In addition, since the adhesive agent of the second embodiment has a structure having a relatively sp...

Embodiment

[0244] Hereinafter, synthesis examples, examples of the present invention, and comparative examples will be described. In addition, in the following description, unless otherwise indicated, "part" means a mass part, "%" means a mass %, and "RH" means a relative humidity. Unless otherwise specified, the unit of the compounding quantity in a table|surface is "mass part." Unless otherwise indicated, the compounding quantity of the component other than a solvent is a non-volatile component conversion value.

[0245] [Evaluation items and evaluation methods for materials or hydroxyl-terminated urethane prepolymers]

[0246] The evaluation items and evaluation methods of the material or the hydroxyl-terminated urethane prepolymer are as follows.

[0247] (Mw, Mn)

[0248] Weight average molecular weight (Mw) and number average molecular weight (Mn) are measured by the gel permeation chromatography (GPC) method. Measurement conditions are as follows. In addition, both Mw and Mn ...

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Abstract

Provided are: an adhesive agent which has good initial hardenability, is capable of forming an adhesive layer that is suppressed in increase in adhesive force even when exposed to a hot environment, particularly a humid and hot environment, and has good removability; and an adhesive sheet which uses the adhesive agent. The adhesive according to the present invention comprises: a hydroxyl-terminated urethane prepolymer (UPH) which is a reaction product of one or more types of active hydrogen group-containing compounds (H) having a plurality of active hydrogen groups in one molecule and one or more types of polyisocyanates (N); and a polyfunctional isocyanate compound (I). The adhesive is a urethane-based adhesive having a branching degree of 0.2 to 0.8 as measured by a GPC-MALS method in a hydroxyl-terminated urethane prepolymer (UPH).

Description

technical field [0001] The invention relates to an adhesive and an adhesive sheet. Background technique [0002] Conventionally, an adhesive sheet having an adhesive layer formed on a base sheet has been widely used as a surface protection sheet for various members. As the adhesive, there are acrylic adhesives, silicone adhesives, urethane adhesives, and the like. Acrylic adhesives are excellent in adhesive force, but are not good in re-peelability after being attached to an adherend due to high adhesive force. With regard to silicone-based adhesives, there are also concerns that contamination is likely to occur on adherends, and silicone resins with relatively low molecular weights are volatilized and adsorbed on the surfaces of electronic components and other equipment, causing problems. On the other hand, the urethane-based adhesive has good adhesion to an adherend, is also relatively excellent in re-peelability, and is also less volatile. [0003] In this specificatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A99Z99/00
CPCC09J7/38C09J175/04C08G18/10C08G18/42C08G18/48C08G18/73C08K2201/017
Inventor 戸根嘉孝坪井优季柏村岳宫沢豪斋藤秀平
Owner TOYO INK SC HOLD CO LTD
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