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Re-peelable adhesives and surface protection films

A re-peeling type, adhesive technology, applied in the direction of adhesive type, polyurea/polyurethane adhesive, film/sheet adhesive, etc., can solve pollution and other problems, achieve excellent wettability, Excellent punching processability

Active Publication Date: 2021-03-12
TOYO INK SC HOLD CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the above-mentioned punching process, the adhesive may adhere to the cutting blade in powder form, and electronic components and displays may be contaminated with adhesive residue.

Method used

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  • Re-peelable adhesives and surface protection films
  • Re-peelable adhesives and surface protection films
  • Re-peelable adhesives and surface protection films

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0127] Hereinafter, the present invention will be described more specifically by way of examples, but the present invention is not limited to the following examples. Hereinafter, "part" means "mass part" and "%" means "mass%" unless otherwise specified.

[0128] The methods for measuring the weight average molecular weight (Mw) of the resin, the viscosity of the resin, and the hydroxyl value of the resin are as follows.

[0129] (Resin weight average molecular weight (Mw))

[0130] The measurement of the weight average molecular weight was performed under the following conditions. The weight average molecular weight is a polystyrene-equivalent weight average molecular weight determined by gel permeation chromatography (GelPermeation Chromatography, GPC). The measurement conditions are as follows.

[0131] Device: SHIMADZU Prominence (product name, manufactured by Shimadzu Corporation);

[0132] Chromatographic column: three Tosoh TSK-GEL GMHXL (manufactured by Tosoh Corpor...

Synthetic example 1

[0150]Under a nitrogen atmosphere, 100 mass parts of polyester polyol P-1010 (difunctional polyester polyol, hydroxyl value 112, number average molecular weight 1000, manufactured by Japan Kuraray Co., Ltd.), 15.5 mass parts of six Methylene diisocyanate (manufactured by Sumitomo Bayer), 77 parts by mass of toluene, 0.25 parts by mass of dibutyltin dilaurate as a catalyst, and 0.01 parts by mass of tin 2-ethylhexanoate were added to the Stirrer, reflux condenser, nitrogen inlet tube, thermometer and dropping funnel in a four-neck flask. The temperature of the flask was gradually raised, and the reaction was carried out at about 90° C. for 2 hours. The reaction was continued while constantly checking whether or not the isocyanate group disappeared by infrared absorption (IR) spectroscopy. After confirming the disappearance of the isocyanate group, it was cooled immediately to complete the reaction. Then, toluene was added so that the non-volatile content (NV) became 60%, and ...

Synthetic example 2～13

[0152] In each of Synthesis Examples 2-13, except having changed the raw material / compounding quantity as shown in Table 1, it carried out similarly to Synthesis Example 1, and obtained the solution of polyurethane resin 2-13. Table 1 describes the solid content (NV) and viscosity (VIS) of the polyurethane resin solution, and the hydroxyl value (OH value) and weight average molecular weight (Mw) of the polyurethane resin.

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Abstract

The present invention provides a re-peelable adhesive that is excellent in re-peelability, heat and humidity resistance, and wettability, and is also excellent in punching processability. The re-peelable adhesive includes a polyurethane resin that is a reaction product of a polyol and a polyisocyanate, a curing agent, an ester compound, and a deterioration inhibitor, and the ester compound does not include a polyurethane resin, and the polyol 50 mass % or more of polyester polyols are contained in 100 mass % of all polyols.

Description

technical field [0001] The present invention relates to a re-peelable adhesive and a surface protection film using the re-peelable adhesive. Background technique [0002] The surface protective film exhibits a peelable function after sticking, and is preferably used for surface protection of electronic components, displays, and substrates used in their manufacturing processes. For example, in the manufacture of liquid crystal displays, it is used for surface protection to prevent damage to the glass surface. The surface protection film is used by punching according to the size of electronic components, displays, and the like. When performing the above-mentioned punching process, the adhesive may adhere to the cutting blade in powder form, and electronic components, displays, and the like may be contaminated with adhesive residue. [0003] In Patent Document 1, an adhesive composition including an acrylic resin, an isocyanate crosslinking agent, and a dimethyl silicon compo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J175/06C09J175/08C09J11/06C09J7/20C09J7/25C09J7/30C08G18/73C08G18/42C08G18/48C08G18/79
CPCC09J7/255C09J11/06C09J175/06C09J175/08C08G18/4018C08G18/4202C08G18/4808C08G18/4825C08G18/4829C08G18/73C08G18/792C08K5/00C08K5/11C08K5/1345C08K5/526C09J2475/00C09J2467/006C09J7/20C09J175/04
Inventor 青谷朋之入江刚史
Owner TOYO INK SC HOLD CO LTD
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