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Adhesive composition and adhesive film

A technology of adhesives and compositions, applied in the direction of adhesives, non-polymer organic compound adhesives, adhesive types, etc., can solve the problem of white turbidity of optical adhesive layers, increase the proportion of hydrophilic monomers, increase Problems such as the proportion of alkoxy-containing monomers, etc., to achieve the effect of inhibiting oxidation and preventing white turbidity

Active Publication Date: 2022-03-01
FUJIMORI KOGYO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] Conventionally, in order to solve the problem that the thick-coated optical adhesive layer becomes cloudy after being left in a high-temperature and high-humidity atmosphere, increasing the hydroxyl-containing copolymerization monomer of the acrylic polymer contained in the adhesive composition has been carried out. Countermeasures for increasing the content ratio of hydrophilic monomers, such as increasing the content ratio of alkoxy-containing monomers, etc.

Method used

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  • Adhesive composition and adhesive film
  • Adhesive composition and adhesive film
  • Adhesive composition and adhesive film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] Nitrogen gas was introduced into a reaction device equipped with a stirrer, a thermometer, a reflux cooler, and a nitrogen gas introduction pipe to replace the air in the reaction device with nitrogen gas. Then, 90 parts by weight of butyl acrylate, 10 parts by weight of methyl methacrylate, 8.0 parts by weight of 8-hydroxyoctyl acrylate, and 100 parts by weight of solvent (ethyl acetate) were added to the reaction device. Then, 0.1 part by weight of azobisisobutyronitrile was added dropwise as a polymerization initiator over 2 hours, and reacted at 65° C. for 8 hours to obtain the acrylic polymer solution of Example 1 with a weight average molecular weight of 800,000.

Embodiment 2～5 and comparative example 1～4

[0086] Example 2 was obtained in the same manner as the acrylic polymer solution used in Example 1 above, except that the compositions of the monomers were as described in Table 1 (A), (B), and (F). ~5 and the acrylic polymer solutions of Comparative Examples 1~4. Here, (F) represents a carboxyl group-containing copolymerizable monomer. The weight-average molecular weight of the acrylic polymer is in the range of 200,000 to 2 million.

[0087]

[0088] [Example 1]

[0089] With respect to the acrylic polymer solution of Example 1, polypropylene glycol distearate (molecular weight 800) was added in a ratio of 5 parts by weight, Coronate (registered trademark) L was added in a ratio of 0.3 parts by weight, IRGANOX (registered trademark) 1010 was added in proportion and stirred and mixed to obtain the adhesive composition of Example 1.

[0090] This adhesive composition was coated on a release film formed of a silicone resin-coated polyethylene terephthalate (PET) film, and ...

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Abstract

The present invention provides an adhesive composition and an adhesive film which do not cause cloudiness even when the adhesive layer is applied thickly and left in a high-temperature and high-humidity atmosphere for a long time, and which have excellent cloudiness prevention performance. The adhesive composition contains (meth)acrylate monomers having a weight average molecular weight of 200,000 to 2 million, an acid value of 5.0 or less, and a carbon number of C1 to 18 relative to a total of 100 parts by weight of (A) alkyl groups. At least one or more, an acrylic polymer formed by copolymerizing (B) at least one or more hydroxyl-containing copolymerizable monomers in a ratio of 0.1 to 10 parts by weight; R 1 COO‑(R 3 -O) n ‑CO‑R 2 At least one of the (C) diester compounds represented, R 1 , R 2 Represents an alkyl group with 4 to 17 carbon atoms, R 3 Represents an alkylene group having 2 to 5 carbon atoms, n represents an integer of 3 to 25; (D) an isocyanate compound and (E) an antioxidant.

Description

technical field [0001] The present invention provides an adhesive composition and an adhesive film which do not become cloudy even when the adhesive layer is thickly applied and left for a long time in an atmosphere of high temperature and high humidity, Excellent anti-white turbidity performance. Background technique [0002] In recent years, in various displays such as liquid crystal panels and organic electroluminescence panels, various optical films or protective plates are attached to the front surface of the displays. On the front of the display, for example, a touch panel capable of performing functional operations of the display by touching the screen with a finger, an anti-reflection film for preventing external light from being reflected on the surface of the touch panel, and the like are attached. By using these films as an optical film for a display, the improvement of the handling function of a display and the improvement of the imaging condition of an image ar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J133/08C09J133/10C09J11/06C09J11/08C09J4/02C09J4/06C09J7/30
CPCC09J11/06C09J11/08C09J133/066C09J2467/006C09J2301/122C08L71/02G02B5/3033C09J7/22C09J133/08C09J133/10C09J2301/312
Inventor 长仓毅长谷川良吉田弘幸菱沼昌世铃木史惠大津贺健太郎
Owner FUJIMORI KOGYO CO LTD