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Urethane-based adhesives and adhesive sheets

A technology of urethane and adhesive, applied in the direction of polyurea/polyurethane adhesive, adhesive, adhesive type, etc., can solve problems such as poor re-peelability, reduced re-peelability, and bad conditions, and achieve good Good re-peelability and curability, and the effect of reducing adhesion

Active Publication Date: 2021-12-21
TOYO INK SC HOLD CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although acrylic adhesives have excellent adhesive force, they have poor re-peelability after being attached to the adherend due to strong adhesive force
In particular, after time passes in a (humid) heat environment, the re-peelability is further reduced due to an increase in the adhesive force, and the adherend contamination is likely to occur in which the adhesive remains on the surface of the adherend after re-peeling. tendency
Silicone-based adhesives tend to contaminate the adherend, and the silicone resin with low molecular weight volatilizes and adsorbs on the surface of electronic components and other equipment, which may cause problems

Method used

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  • Urethane-based adhesives and adhesive sheets
  • Urethane-based adhesives and adhesive sheets
  • Urethane-based adhesives and adhesive sheets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0238] Hereinafter, synthesis examples, examples of the present invention, and comparative examples will be described. In addition, in the following description, unless otherwise specified, "part" means a mass part, "%" means a mass %, and "RH" means a relative humidity.

[0239] [Measurement of Mn and Mw]

[0240] The number average molecular weight (Mn) and weight average molecular weight (Mw) are measured by the gel permeation chromatography (GPC) method. The measurement conditions are as follows. In addition, both Mn and Mw are values ​​in terms of polystyrene.

[0241]

[0242] Device: Shimadzu Prominence (SHIMADZU Prominence) (manufactured by Shimadzu Corporation),

[0243] Column: Two LF-804 manufactured by Shodex are connected in series,

[0244] Detector: Differential Refractive Index Detector (RID-10A),

[0245] Solvent: tetrahydrofuran (THF),

[0246] Flow rate: 1mL / min,

[0247] Solvent temperature: 40°C,

[0248] Sample concentration: 0.2%,

[0249] Sam...

Synthetic example 1

[0287] (Synthesis example 1) (1-stage polymerization method)

[0288] 5 parts by mass of active hydrogen group-containing compound (HX-11) and 95 parts by mass of active hydrogen group-containing compound (HX-18) were put into a four-necked flask equipped with a stirrer, a reflux cooling pipe, a nitrogen gas introduction pipe, a thermometer, and a dropping funnel. Parts by mass, 1.6 parts by mass of polyisocyanate (N-11), 67 parts by mass of toluene, 0.020 parts by mass of dioctyltin dilaurate as a catalyst, and 0.008 parts by mass of tin 2-ethylhexanoate were mixed. The temperature of the internal solution was gradually raised to 75° C., and the reaction was performed for 3 hours.

[0289] The ratio of the number of moles of isocyanate groups in the polyisocyanate (N) used in the reaction to the total number of moles of active hydrogen groups in all active hydrogen group-containing compounds (HX) used in the reaction (NCO / H ratio) was 0.49.

[0290] After the disappearance ...

Synthetic example 13

[0296] (Synthesis Example 13) (Multistage Polymerization Method)

[0297] 100 parts by mass of compound (HX-13) containing active hydrogen group, 17 parts by mass of polyisocyanate (N-13), toluene 29.3 parts by mass and 0.01 part by mass of dioctyltin dilaurate as a catalyst were mixed. The temperature of the internal solution was gradually raised to 100° C., and the reaction was performed for 2 hours. Then, after cooling to 25 degreeC and adding 90.7 mass parts of ethyl acetates and 0.5 mass parts of acetylacetones, 3.4 mass parts of active hydrogen group containing compounds (HX-21) were dripped over 1 hour. After maintaining the liquid temperature at 25°C and continuing the reaction for 1 hour, 1.2 parts by mass of an active hydrogen group-containing compound (HX-22) was added and reacted. After the disappearance of the remaining isocyanate groups was confirmed by infrared spectroscopic analysis (IR analysis), the reaction was terminated.

[0298] In this way, a colorles...

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PUM

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Abstract

The present invention provides a urethane-based adhesive and an adhesive sheet, which are excellent in that the adhesive force is reduced even at the initial stage (before aging) and after aging (especially after (wet) heat aging). Excellent re-peelability, can form an adhesive layer with less contamination of the adherend after re-peeling. The adhesive of the present invention is a urethane-based adhesive comprising: one or more active hydrogen group-containing compounds (H) having a plurality of active hydrogen groups in one molecule, and one or more polyfunctional isocyanates Compound (I), and one or more surfactants (S) having a cationic hydrophilic group, the surfactant (S) has an amine value of 0.1 mgKOH / g to 150 mgKOH / g in terms of non-volatile components, relative to Content of surfactant (S) with respect to 100 mass parts of active hydrogen group containing compounds (H) is 0.01 mass part - 20 mass parts.

Description

technical field [0001] The present invention relates to a urethane adhesive and an adhesive sheet. Background technique [0002] Conventionally, an adhesive sheet in which an adhesive layer is 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 have poor re-peelability after being attached to an adherend due to strong adhesive force. In particular, after time passes in a (humid) heat environment, the re-peelability is further reduced due to an increase in the adhesive force, and the adherend contamination is likely to occur in which the adhesive remains on the surface of the adherend after re-peeling. tendency. Silicone-based adhesives tend to contaminate the adherend, and the silicone resin with a low molecular weight volatilizes and adsorbs on the surface of electronic compon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J175/04C09J7/38C09J11/06
CPCC09J11/06C09J7/38C09J175/04C09J7/20C09J2301/312
Inventor 户根嘉孝斋藤秀平田邉慎吾
Owner TOYO INK SC HOLD CO LTD
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