Adhesive bonding composition for optical use, method for multistage curing thereof, and image display device
Provided are an adhesive bonding composition for optical use and a multistage curing method thereof, the composition including a methacrylate-based monomer and an acrylate-based monomer, in which a weight ratio of the methacrylate-based monomer to the acrylate-based monomer ranges from about 1:1 to about 1:10.
1. An adhesive bonding composition for optical use, the composition comprising:
a methacrylate-based monomer;
an acrylate-based monomer,
a plasticizer,
wherein
a content of the methacrylate-based monomer ranges from 15 wt % to 20 wt %,
a content of the acrylate-based monomer ranges from 25 wt % to 30 wt %, and
a content of the plasticizer ranges from 3 wt % to 10 wt %, and
a weight ratio of the methacrylate-based monomer to the acrylate-based monomer ranges from 1:1.25 to 1:2.
2. The adhesive bonding composition of claim 1 , further comprising:
a (meth)acrylate-based oligomer, a photoinitiator, or a combination thereof.
3. The adhesive bonding composition of claim 1 , wherein a bonding strength of a bonding layer which is formed by multi-stage curing of the adhesive bonding composition ranges from 30 N/cm 2 to 100 N/cm 2 under a temperature condition of about 25° C.
4. A method for multistage curing the adhesive bonding composition of claim 1 comprising:
applying the adhesive bonding composition of claim 1 onto a top of an image display part;
forming an adhesive agent by primarily photo-curing the adhesive bonding composition;
adhering a protective part onto a top of the adhesive agent; and
forming a bonding agent by secondarily photo-curing the adhesive agent interposed between the image display part and the protective part.
5. The method of claim 4 , wherein the adhesive bonding composition is primarily photo-cured under a light amount condition ranging from 100 mJ/cm 2 to 1,000 mJ/cm 2 .
6. The method of claim 4 , wherein the adhesive agent is secondarily photo-cured under a light amount condition ranging from 2,000 mJ/cm 2 to 6,000 mJ/cm 2 .
7. An image display device comprising:
an image display part;
a bonding layer formed by multistage photo-curing the adhesive bonding composition for optical use according to claim 1 ; and
a protective part.
8. The image display device of claim 7 , wherein an adhesive layer is formed by applying the adhesive bonding composition on the image display part, and then primarily photo-curing the adhesive bonding composition, and subsequently, a bonding layer is formed by adhering the protective part onto a top of the adhesive layer, and then secondarily photo-curing the adhesive layer, so that the image display part and the protective part are bonded to each other via the adhesive layer.
9. The image display device of claim 7 , wherein a bonding strength of the bonding layer with respect to the protective part ranges from 30 N/cm 2 to 100 N/cm 2 under a temperature condition of about 25° C.
10. The image display device of claim 7 , wherein the bonding layer has a thickness ranging from 50 μm to 300 μm.
11. The image display device of claim 7 , wherein the image display part is a liquid crystal display (LCD).
12. The image display device of claim 7 , wherein the protective part is a glass substrate or a transparent plastic substrate.