OLEFIN-based ionomer resin composition
The present application relates to an olefin-based ionomer resin composition, to an encapsulant, and to an optoelectronic device. The resin composition according to the present application may be used as an encapsulant for a variety of optoelectronic devices, and may exhibit superior adhesion to the substrates of the optoelectronic devices. In addition, according to the present application, an olefin-based ionomer resin composition, which can provide good workability and economic advantages in the manufacture of devices without negatively affecting components such as encapsulated optoelectronic elements or the wired electrodes of optoelectronic devices, may be provided.
1. An olefin-based ionomer resin composition comprising:
a modified olefin copolymer having two or more functional groups which includes a carboxyl group,
wherein the modified olefin copolymer is a graft copolymer in which an ethylenically unsaturated silane compound as a first monomer and a monomer having an ethylenically unsaturated double bond as a second monomer are grafted to a polyolefin having a density of 0.85 g/cm 3 to 0.96 g/cm 3 , and a part or whole of the carboxyl group in the olefin-based ionomer resin composition is neutralized with metal ions.
2. The olefin-based ionomer resin composition of claim 1 , wherein the second monomer is an acid anhydride-based monomer, (meth)acrylic acid, an alkyl(meth)acrylate, glycidyl(meth)acrylate, 2-hydroxyethyl(meth)acrylate, polyethylene glycol(meth)acrylate, vinyl sulfonic acid, a vinyl sulfonic acid alkyl ester, vinyl phosphoric acid, a vinyl phosphoric acid alkyl ester, or N-(hydroxymethyl)acrylamide.
3. The olefin-based ionomer resin composition of claim 2 , wherein the second monomer is maleic acid anhydride, (meth)acrylic acid, methyl(meth)acrylate, glycidyl(meth)acrylate, 2-hydroxyethyl(meth)acrylate, polyethylene glycol(meth)acrylate, vinyl sulfonic acid, diethyl vinyl phosphate, or N-(hydroxymethyl)acrylamide.
4. The olefin-based ionomer resin composition of claim 1 , wherein a content of the second monomer is 0.5 to 10 parts by weight based on 100 parts by weight of a solid content in the olefin-based ionomer resin composition.
5. The olefin-based ionomer resin composition of claim 1 , wherein 10% or more of the carboxyl group in the olefin-based ionomer resin composition is neutralized with metal ions.
6. The olefin-based ionomer resin composition of claim 1 , wherein the metal ions are one or more selected from the group consisting of zinc ions, sodium ions, magnesium ions, calcium ions, lithium ions, potassium ions, tin ions, aluminum ions, barium ions, and tin ions.
7. The olefin-based ionomer resin composition of claim 1 , wherein the modified olefin copolymer is a graft copolymer in which the second monomer is grafted to a silane modified olefin copolymer having a silyl group represented by the following Formula 1:
—Si(X) m Y (3-m) [Formula 1]
in Formula 1, X represents a halogen atom, an alkoxy group, a phenoxy group, an acyloxy group, an alkylthio group, or an alkyleneoxythio group, Y represents hydrogen, an alkyl group, an aryl group, or an aralkyl group, and m represents an integer of 1 to 3.
8. The olefin-based ionomer resin composition of claim 7 , wherein X represents an alkoxy group having 1 to 12 carbon atoms.
9. The olefin-based ionomer resin composition of claim 1 , wherein the modified olefin copolymer is a graft copolymer in which an unsaturated silane compound of the following Formula 2 and the second monomer are grafted to a polyolefin:
DSi(X) m Y (3-m) [Formula 2]
in Formula 2, D represents an alkenyl group, and X represents a halogen atom, an alkoxy group, a phenoxy group, an acyloxy group, an alkylthio group, or an alkyleneoxythio group, Y represents hydrogen, an alkyl group, an aryl group, or an aralkyl group, and m represents an integer of 1 to 3.
10. The olefin-based ionomer resin composition of claim 9 , wherein the unsaturated silane compound of Formula 2 is vinyl trimethoxy silane, vinyl triethoxy silane, vinyl tripropoxy silane, vinyl triisopropoxy silane, vinyl tributoxy silane, vinyl tripentoxy silane, vinyl triphenoxy silane, or vinyl triacetoxy silane.
11. The olefin-based ionomer resin composition of claim 1 , wherein the polyolefin is prepared in the presence of a catalyst, and comprises an ethylene-octene copolymer having a density of 0.857 g/cm 3 to 0.910 g/cm 3 , and the ethylene-octene copolymer satisfies the following Formula:
1) molecular weight distribution: Mw/Mn<3.5,
2) r e ×r o is 0.5 to 0.8, and
3) a relationship equation between the content a (mol %) of octene in the ethylene-octene copolymer and the density of the ethylene-octene copolymer: 0.9190−0.0043α<density<0.9205−0.0040α,
wherein r e is a reactivity ratio of ethylene to the catalyst and r o is a reactivity ratio of ethylene to the catalyst, both are calculated by the following Kakugo's method,
r
e
=
2
EEE
+
EEC
(
2
ECE
+
CCE
)
X
,
r
o
=
(
2
CCC
+
CCE
)
X
2
ECE
+
CCE
,
where, E is ethylene,
C is octene which is a co-monomer,
X is a mole fraction of ethylene and octene which are monomers injected into a reactor,
EEE is a mole % of the sequence arrangement of ethylene-ethylene-ethylene in the ethylene-octene copolymer,
EEC is a mole % of the sequence arrangement of ethylene-ethylene-octene in the ethylene-octene copolymer,
ECE is a mole % of the sequence arrangement of ethylene-octene-ethylene in the ethylene-octene copolymer,
CCE is a mole % of the sequence arrangement of octene-octene-ethylene in the ethylene-octene copolymer, and
CCC is a mole % of the sequence arrangement of octene-octene-octene in the ethylene-octene copolymer.
12. The olefin-based ionomer resin composition of claim 1 , wherein in the modified olefin copolymer is a graft copolymer in which the first monomer and the second monomer are grafted to the polyolefin by a radical initiator.
13. The olefin-based ionomer resin composition of claim 12 , wherein the radical initiator is an organic peroxide, a hydroperoxide, or an azo compound.
14. The olefin-based ionomer resin composition of claim 12 , wherein the radical initiator is one or more selected from the group consisting of t-butylcumyl peroxide, di-t-butyl peroxide, di-cumyl peroxide, 2,5-dimethyl-2,5-di(t-butylperoxy)hexane, 2,5-dimethyl-2,5-di(t-peroxy)hexane, cumene hydroperoxide, diisopropyl benzene hydroperoxide, 2,5-dimethyl-2,5-di(hydroperoxy)hexane, t-butyl hydroperoxide, bis-3,5,5-trimethylhexanoyl peroxide, octanoyl peroxide, benzoyl peroxide, o-methylbenzoyl peroxide, 2,4-dichlorobenzoyl peroxide, t-butylperoxy isobutylate, t-butylperoxy acetate, t-butylperoxy-2-ethylhexanoate, t-butylperoxy pivalate, t-butylperoxy octoate, t-butylperoxyisopropyl carbonate, t-butylperoxy benzoate, di-t-butylperoxy phthalate, 2,5-dimethyl-2,5-di(benzoylperoxy)hexane, 2,5-dimethyl-2,5-di(benzoylperoxy)hexyne, methyl ethyl ketone peroxide, cyclohexanone peroxide, lauroyl peroxide, azobisisobutyronitrile, and azobis(2,4-dimethylvaleronitrile).
15. The olefin-based ionomer resin composition of claim 12 , wherein the radical initiator is used in an amount of 0.5 to 20 parts by weight based on 100 parts by weight of the first monomer and the second monomer.
16. The olefin-based ionomer resin composition of claim 1 , further comprising one or more selected from the group consisting of a light stabilizer, a UV absorber, and a heat stabilizer.
17. An encapsulant for an optoelectronic device, comprising the olefin-based ionomer resin composition of claim 1 .
18. The encapsulant for an optoelectronic device of claim 17 , wherein a content of the second monomer is 0.5 to 10 parts by weight based on 100 parts by weight of a solid content in the olefin-based ionomer resin composition.