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Adhesive composition for surface protection film and surface protection film

A surface protection film and adhesive technology, applied in the direction of film/sheet adhesive, adhesive type, ester copolymer adhesive, etc., can solve the problem of insufficient flexibility of the adhesive layer, sticky Solve the problems of increased resultant force and poor wettability of the adherend, and achieve the effect of inhibiting the increase of adhesive force, reducing pollution and metal corrosion

Active Publication Date: 2019-03-01
SOKEN CHEM & ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are problems of corrosion of adherends including metal oxides, etc. caused by the high acid value of acrylic resins of 16 to 120 mg KOH / g and increased adhesion after heat resistance, and due to the use of Insufficient flexibility of the adhesive layer and poor wettability to the adherend caused by epoxy crosslinking agent

Method used

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  • Adhesive composition for surface protection film and surface protection film
  • Adhesive composition for surface protection film and surface protection film
  • Adhesive composition for surface protection film and surface protection film

Examples

Experimental program
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Embodiment

[0132] Hereinafter, the present invention will be described more specifically based on examples, but the present invention is not limited to these examples. In descriptions of the following Examples and the like, "parts" means "parts by mass" unless otherwise specified.

[0133] [GPC]

[0134] The weight average molecular weight (Mw) and the number average molecular weight (Mn) of the (meth)acrylic resin (A) were calculated|required by the gel permeation chromatography (GPC) method under the following conditions.

[0135] ・Measuring device: HLC-8320GPC (manufactured by Tosoh Corporation)

[0136] ・The composition of the GPC column: the following 4 columns (all manufactured by Tosoh Co., Ltd.)

[0137] (1) TSKgel HxL-H (guard column)

[0138] (2) TSKgel GMHxL

[0139] (3) TSKgel GMHxL

[0140] (4)TSKgel G2500HxL

[0141] ·Flow rate: 1.0ml / min

[0142] ·Column temperature: 40℃

[0143] ·Sample concentration: 1.5% (w / v) (diluted with tetrahydrofuran)

[0144] ·Mobile p...

Synthetic example A1

[0149] Add 95.0 parts of n-butyl acrylate, 5.0 parts of 4-hydroxybutyl acrylate, and 100 parts of ethyl acetate solvent to a reaction device equipped with a stirrer, a reflux cooler, a thermometer, and a nitrogen gas introduction tube, and raise the temperature to 80°C while introducing nitrogen gas . Then, 0.1 part of 2,2'-azobisisobutyronitrile was added, and the polymerization reaction was performed at 80 degreeC for 6 hours in nitrogen atmosphere. After completion of the reaction, it was diluted with ethyl acetate to prepare a polymer solution having a solid content concentration of 20% by mass. Mw of the obtained (meth)acrylic resin A1 was 1.6 million, and Mw / Mn was 6.0. The calculated acid value is 0.

Synthetic example A2

[0151] Except for blending polymerizable monomers and changing the blending amount of ethyl acetate solvent to 115 parts by mass as described in Table 1-1, the polymerization reaction and the preparation of the polymer solution were carried out in the same manner as in Synthesis Example A1 to obtain A polymer solution containing (meth)acrylic resin A2 with a solid content concentration of 20% by mass. The results are shown in Table 1-1.

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PUM

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Abstract

The present invention provides an adhesive for a surface protection film that can form an adhesive layer that reduces contamination and metal corrosion to an adherend, has an appropriate adhesive force, and suppresses an increase in the adhesive force after a high-temperature manufacturing process. Agent composition and surface protection film with said adhesive layer. The composition is an adhesive composition for a surface protection film containing a (meth)acrylic resin (A) and a hexamethylene diisocyanate crosslinking agent (B), wherein the (meth)acrylic acid The resin-like (A) is obtained by solution-polymerizing a polymerizable monomer containing an alkyl (meth)acrylate having an alkyl carbon number of 4 or less in an amount ranging from 30.0 to 99% by mass, and has the following ( The properties of a1), (a2) and (a3), wherein the gel fraction of the pressure-sensitive adhesive layer formed from the pressure-sensitive adhesive composition for surface protection film is contained in an amount in the range of 90.0 to 99.9% by mass. Hexamethylene diisocyanate crosslinking agent (B). (a1) The polystyrene-equivalent weight average molecular weight (Mw) measured by gel permeation chromatography (GPC method) is in the range of 1.2 million to 2 million, and (a2) The molecular weight distribution (Mw / Mn) is 4 to 9 In the range of (a3) ​​the acid value is below 2mg KOH / g.

Description

technical field [0001] The present invention relates to an adhesive composition for a surface protection film and a surface protection film. Background technique [0002] In recent years, liquid crystal display devices such as smartphones and tablet PCs, and display devices such as plasma displays have been widely used. When looking at the cross-section of such a display device, it has a thin multilayer laminated structure including various functions, and functional films for optics forming these multilayered laminated structures are becoming more and more functional. In order to stably produce and store a display device composed of such a high-performance optical functional film, it is necessary to attach a surface protective film for preventing damage to the surface of the display device. [0003] A surface protection film usually has a film-like support and an adhesive layer formed on at least one surface thereof, and the surface protection film is adhered to an adherend...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J133/08C09J7/25C09J11/06C09J7/20
CPCC09J11/06C09J133/00C09J7/20
Inventor 池上坚真清水政一
Owner SOKEN CHEM & ENG CO LTD
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