Multi-region foldable adhesive film and method of making same

A multi-region, adhesive film technology, applied in the field of rights and interests on the date of application, can solve the problems of adhesive film processing characteristics deterioration, adhesive film stress relief ability reduction, adhesive film creases, etc., to improve the stress relief rate, Improving the effect of recovery properties

Pending Publication Date: 2022-03-18
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when an adhesive film is used as an adhesive film applied to a foldable display, there may be a problem that since the folded portion and the non-folded portion in the adhesive film have the same physical properties, there may be a problem in the adhesive film There will be creases, or bubbles in the adhesive film, etc.
[0006] Therefore, when the foldable adhesive film is configured to have an improved stress relief capability over its entire area, there arises a problem that residue generated during cutting of the adhesive film increases, resulting in deterioration of the processing characteristics of the adhesive film
On the other hand, when the foldable adhesive film is configured to have an improved recovery rate over its entire area, there arises such a problem that the stress relieving ability of the adhesive film is reduced, thus causing cracks by folding the adhesive film

Method used

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  • Multi-region foldable adhesive film and method of making same
  • Multi-region foldable adhesive film and method of making same
  • Multi-region foldable adhesive film and method of making same

Examples

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Embodiment approach

[0084] According to one embodiment of the invention, the method comprises the step of applying the adhesive composition to the substrate. The method of applying the adhesive composition is not particularly limited. Specifically, the method of applying the adhesive composition to the substrate may be an applicator method, a rod coater method, a comma coater method, or the like.

[0085] According to one embodiment of the present invention, the adhesive layer may have a thickness of 10 μm to 100 μm. Specifically, the adhesive layer may have a thickness of 10 μm to 80 μm, 10 μm to 60 μm, or 10 μm to 40 μm. By adjusting the thickness of the adhesive layer within the above range, it is possible to adjust the step coverage property and adhesive strength of the foldable adhesive film.

[0086] According to one embodiment of the present invention, the foldable adhesive film comprises a substrate disposed on one surface of the adhesive layer. In particular, by including the substrat...

Embodiment 1

[0105] (1) Preparation of copolymer

[0106] A monomer mixture was introduced into a 1L reactor, the monomer mixture comprising a mixture containing about 97.98% by weight of 2-ethylhexyl acrylate (2-EHA) and about 2.02% by weight of acrylic acid (AA) and based on 100 parts by weight The mixture was 1.01 parts by weight of benzophenone methacrylate (BPMA), and then ethyl acetate (EAc) was introduced as a solvent. Next, the reactor was purged with nitrogen for about 1 hour to remove oxygen and then maintained at a temperature of 62°C. After homogenizing the monomer mixture, 400 ppm of azobisisobutyronitrile (AIBN) as a reaction initiator and 400 ppm of n-dodecylmercaptan (n-DDM) as a chain transfer agent were added thereto, and the mono body mixture reaction. After the reaction was completed, the reaction product was diluted with ethyl acetate, thereby preparing a copolymer having a weight average molecular weight of 2,000,000.

[0107] (2) Preparation of adhesive compositio...

Embodiment 2

[0112] An adhesive film was produced in the same manner as in Example 1, except that a monomer mixture containing about 98.48% by weight of 2-ethylhexyl acrylate (2- EHA) and about 2.02% by weight of acrylic acid (AA) and about 0.51 parts by weight of benzophenone methacrylate (BPMA), based on 100 parts by weight of the mixture.

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Abstract

The present invention relates to a multi-region foldable adhesive film and a method for manufacturing the same, and in particular, to a multi-region foldable adhesive film having improved folding characteristics by imparting different physical characteristics to an adhesive layer included in the foldable adhesive film, and a method for manufacturing the same.

Description

technical field [0001] This invention claims Korean Patent Application No. 10-2019-0164158 filed with KIPO on December 10, 2019 and Korean Patent Application No. 10-2019-0167239 filed with KIPO on December 13, 2019 The disclosure of which is hereby incorporated by reference in its entirety for the benefit of its filing date. The present invention relates to a multi-region foldable adhesive film and a method of making the same, and in particular, to a multi-region foldable adhesive film having improved folding characteristics by making the adhesive layers included in the foldable adhesive film have different physical properties. Folding adhesive film and method for its manufacture. Background technique [0002] Adhesive films are manufactured to have uniform physical properties over the entire area of ​​the adhesive film, regardless of the chemical properties of the adherend, surface roughness, desired mechanical properties, viscosity and thermal properties. However, when a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/38C09J7/40C09J11/06H01L51/52H10K99/00
CPCC09J7/385C09J7/40C09J11/06C09J2301/312C08K5/07C09J2203/318C09J2301/416H10K50/8426Y02P70/50C09J2301/208C09J2433/00H10K77/111H10K2102/311C09J11/00C09J7/20C09J7/403C09J7/10C09J2301/408C09J2301/21C09J133/10C09J2467/006C09J7/255C09J2301/302C09J2301/414C09J133/08C09J2301/124
Inventor 朴炳洙金贤哲朴现圭
Owner LG CHEM LTD
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