Adhesive composition and display device
An adhesive composition includes: a binder component; a photo-initiator component; and an anaerobic-initiator component. The binder component includes a monomer, an oligomer, and a plasticizer; the photo-initiator component includes a photo-radical initiator and a photo-base generator (PBG); and the anaerobic-initiator component includes a metal reactive initiator, an accelerator, and an inhibitor.
1. An adhesive composition comprising:
a binder component;
a photo-initiator component; and
an anaerobic-initiator component,
the binder component comprising:
a monomer in an amount of about 10 wt % to about 60 wt %;
an oligomer in an amount of about 20 wt % to about 80 wt %; and
a plasticizer in an amount of about 5 wt % to about 20 wt %, with respect to a total weight of the adhesive composition,
the photo-initiator component comprising:
a photo-radical initiator in an amount of about 0.3 wt % to about 5 wt %; and
a photo-base generator (PBG) in an amount of about 0.2 wt % to about 2 wt %, with respect to the total weight of the adhesive composition, and
the anaerobic-initiator component comprising:
a metal reactive initiator in an amount of about 0.1 wt % to about 2 wt %;
an accelerator in an amount of about 0.2 wt % to about 2 wt %; and
an inhibitor in an amount of about 0.1 wt % to about 1 wt %, with respect to the total weight of the adhesive composition.
2. The adhesive composition of claim 1 , wherein the monomer comprises at least one selected from the group consisting of: nonylphenyl carbitol acrylate, 2-hydroxy-3-phenoxypropyl acrylate, 2-ethylhexyl carbitol acrylate, 2-hydroxyethyl acrylate, N-vinyl pyrrolidone, 1,6-hexanedioldi(meth)acrylate, ethylene glycol di(meth)acrylate, neopentyl glycol di(meth)acrylate, triethylene glycol di(meth)acrylate, bis(acryloyl oxyethyl) ether, 3-methylpentanediol di(meth)acrylate, ethyl hexyl oxetane, trimethylolpropane tri(meth)acrylate, ethoxylated trimethylolpropane tri(meth)acrylate, propoxylated trimethylolpropane tri(meth)acrylate, pentaerythritol tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, dipentaerythritol penta(meth)acrylate, ethoxylated dipentaerythritol hexa(meth)acrylate, propoxylated dipentaerythritol hexa(meth)acrylate, dipentaerythritol hexa(meth)acrylate, isobornyl acrylate, n-octyl acrylate, tetrahydrofurfuryl acrylate, and 4-hydroxybutyl acrylate.
3. The adhesive composition of claim 1 , wherein the monomer comprises a compound having a cyclic ether group.
4. The adhesive composition of claim 1 , wherein the oligomer comprises at least one selected from the group consisting of: urethane (meth) acrylate and ester (meth) acrylate, each having a weight-average molecular weight (Mw) of from about 5,000 to about 50,000.
5. The adhesive composition of claim 1 , wherein the plasticizer comprises at least one selected from the group consisting of: di-butyl-phthalate (DBP), di-2-ethylhexyl phthalate (DOP), di-isononyl phthalate (DINP), di-isodecyl phthalate (DIDP), and butyl benzyl phthalate (BBP).
6. The adhesive composition of claim 1 , wherein the photo-base generator reacts to light having a wavelength of from about 240 nm to about 385 nm to thereby generate a basic group.
7. The adhesive composition of claim 1 , wherein the photo-base generator comprises at least one selected from the group consisting of: a carbamate compound, an α-amino ketone compound, a quaternary ammonium compound, an aminocyclopropenone compound, an o-acyloxime compound, and 2-(9-oxoxanthen-2-yl) propionic acid 1,5,7-triazabicyclo [4,4,0] dec-5-ene salt.
8. The adhesive composition of claim 1 , wherein the accelerator comprises: saccharin and N,N-dimethyl-p-toluidine (DMPT).
9. The adhesive composition of claim 1 , wherein the metal reactive initiator comprises at least one selected from the group consisting of: cumene hydroperoxide, t-butyl hydroperoxide, di-t-butyl hydroperoxide, methylethylketone peroxide, dicumyl peroxide, 2,5-dimethyl-hexyl-2,5-dihydro peroxide, diisopropylbenzene hydroperoxide, t-butyl benzoate, and t-butyl peroxyacetate.
10. The adhesive composition of claim 1 , wherein the inhibitor comprises at least one selected from the group consisting of: 1,2,3,4-tetrahydroquinoline, hydroquinone, methyl hydroquinone, hydroquinone monomethyl ether, naphthoquinone, penanthraquinone, anthraquinone, benzoquinone, catechol, t-butylcatechol, 2,6-di-t-butyl-p-cresol, 2,6-di-t-butyl-4-methylphenol, phenothiazine, picrin acid phenothiazine, and hydroxy diphenylamine.
11. The adhesive composition of claim 1 , wherein the anaerobic-initiator component further comprises a chelate in an amount of about 0.05 wt % to about 0.5 wt % with respect to the total weight of the adhesive composition.
12. A display device comprising:
a display panel;
an adhesive layer on the display panel; and
a window on the adhesive layer,
wherein the adhesive layer comprises an adhesive polymer resin, a photo-initiator component, and an anaerobic-initiator component,
the photo-initiator component comprises a photo-radical initiator and a photo-base generator,
the anaerobic-initiator component comprises a metal reactive initiator, an accelerator, and an inhibitor, and
the window comprises:
a transparent substrate having a display area and a non-display area;
a light blocking layer in the non-display area of the transparent substrate; and
a metal layer in the non-display area of the transparent substrate, the metal layer contacting the adhesive layer,
wherein the adhesive layer comprises a photo-curing portion corresponding to the display area of the transparent substrate and an anaerobic-curing portion corresponding to the non-display area of the transparent substrate.
13. The display device of claim 12 , wherein the metal layer is on the light blocking layer.
14. The display device of claim 12 , wherein the metal layer comprises at least one of iron (Fe) and copper (Cu).
15. The display device of claim 12 , wherein the metal layer comprises a coating resin and a metal element dispersed in the coating resin.
16. The display device of claim 12 , wherein the photo-curing portion comprises the adhesive polymer resin and the anaerobic-initiator component dispersed in the adhesive polymer resin.
17. The display device of claim 16 , wherein the adhesive polymer resin of the photo-curing portion comprises a polymer moiety and a radical group of the photo-radical initiator bonded to the polymer moiety.
18. The display device of claim 12 , wherein the anaerobic-curing portion comprises the adhesive polymer resin and the photo-initiator component dispersed in the adhesive polymer resin.
19. The display device of claim 18 , wherein the adhesive polymer resin of the anaerobic-curing portion comprises a polymer moiety and a radical group of the metal reactive initiator bonded to the polymer moiety.