Thermoplastic resin composition, method of preparing the same, and molded article manufactured using the same
A thermoplastic resin composition includes an alkyl acrylate-aromatic vinyl compound-vinyl cyanide compound graft copolymer (A) including a seed obtained by polymerizing 35 to 58% by weight of an alkyl acrylate and 42 to 65% by weight of an aromatic vinyl compound, a rubber core formed to surround the seed and obtained by polymerizing 78 to 91% by weight of an alkyl acrylate and 9 to 22% by weight of an aromatic vinyl compound, and a graft shell formed to surround the rubber core and obtained by polymerizing 65 to 82% by weight of an aromatic vinyl compound, 12 to 30% by weight of a vinyl cyanide compound, and 3 to 15% by weight of an alkyl acrylate; and a non-graft copolymer (B) including an alkyl (meth)acrylate, an alkyl-substituted styrene-based compound, and a vinyl cyanide compound.
1 . A thermoplastic resin composition, comprising:
an alkyl acrylate-aromatic vinyl compound-vinyl cyanide compound graft copolymer (A) comprising a seed, a rubber core surrounding the seed, and a graft shell surrounding the rubber core; and
a non-graft copolymer (B) comprising an alkyl (meth)acrylate, an alkyl-substituted styrene-based compound, and a vinyl cyanide compound,
wherein the graft copolymer (A) satisfies Equation 1 below;
when acetone is added to the thermoplastic resin composition and stirring and centrifugation are performed so that the thermoplastic resin composition is separated into a sol and a gel, a refractive index difference between the sol and the gel is 0.006 or less;
the thermoplastic resin composition has a haze of 10% or less as measured using a 3 mm thick injection specimen according to ASTM D1003; and
the thermoplastic resin composition has an Izod impact strength of 10 kgf cm/cm or more as measured at room temperature using a ¼″ thick specimen according to ASTM D256:
180
≤
2
*
r
2
≤
300
,
[
Equation
1
]
wherein r2 is a thickness (nm) from a center of the graft copolymer to the core.
2 . A thermoplastic resin composition, comprising:
an alkyl acrylate-aromatic vinyl compound-vinyl cyanide compound graft copolymer (A) comprising a seed obtained by polymerizing 35 to 58% by weight of an alkyl acrylate and 42 to 65% by weight of an aromatic vinyl compound, a rubber core formed to surround the seed and obtained by polymerizing 78 to 91% by weight of an alkyl acrylate and 9 to 22% by weight of an aromatic vinyl compound, and a graft shell formed to surround the rubber core and obtained by polymerizing 65 to 82% by weight of an aromatic vinyl compound, 12 to 30% by weight of a vinyl cyanide compound, and 3 to 15% by weight of an alkyl acrylate; and
a non-graft copolymer (B) comprising an alkyl (meth)acrylate, an alkyl-substituted styrene-based compound, and a vinyl cyanide compound,
wherein the graft copolymer (A) satisfies both Equations 1 and 2 below:
180
≤
2
*
r
2
≤
300
[
Equation
1
]
25
≤
r
2
-
r
1
≤
45
,
[
Equation
2
]
wherein, in Equations 1 and 2, r1 is a thickness (nm) from a center of the graft copolymer to the seed, and r2 is a thickness (nm) from a center of the graft copolymer to the core.
3 . The thermoplastic resin composition according to claim 1 , wherein, in the graft copolymer (A), a refractive index difference between the rubber core and the graft shell is 0.09 or less.
4 . The thermoplastic resin composition according to claim 1 , wherein a refractive index difference between the seed of the graft copolymer (A) and the non-graft copolymer (B) is 0.012 or less.
5 . The thermoplastic resin composition according to claim 1 , wherein, based on 100% by weight in total of the graft copolymer (A), the graft copolymer (A) comprises 5 to 35% by weight of the seed, 25 to 55% by weight of the rubber core, and 25 to 55% by weight of the graft shell.
6 . The thermoplastic resin composition according to claim 1 , wherein the non-graft copolymer (B) comprises 30 to 60% by weight of the alkyl (meth)acrylate, 25 to 55% by weight of the alkyl-substituted styrene-based compound, and 5 to 35% by weight of the vinyl cyanide compound.
7 . The thermoplastic resin composition according to claim 1 , wherein the thermoplastic resin composition further comprises 10 to 90% by weight of the graft copolymer (A) and 10 to 90% by weight of the non-graft copolymer (B).
8 . The thermoplastic resin composition according to claim 1 , wherein the thermoplastic resin composition further comprises an alkyl acrylate-aromatic vinyl compound-vinyl cyanide compound graft copolymer (C) containing a rubber core having an average particle diameter of 50 to 150 nm.
9 . The thermoplastic resin composition according to claim 2 , wherein, when acetone is added to the thermoplastic resin composition and stirring and centrifugation are performed so that the thermoplastic resin composition is separated into a sol and a gel, a refractive index difference between the sol and the gel is 0.006 or less.
10 . The thermoplastic resin composition according to claim 2 , wherein the thermoplastic resin composition has a haze of 10% or less as measured using a 3 mm thick injection specimen according to ASTM D1003.
11 . The thermoplastic resin composition according to claim 2 , wherein the thermoplastic resin composition has a gloss of 120 or more as measured at 45° using a 3 mm thick injection specimen according to ASTM D2457.
12 . The thermoplastic resin composition according to claim 2 , wherein the thermoplastic resin composition has an Izod impact strength of 10 kgf cm/cm or more as measured at room temperature using a ¼″ thick specimen according to ASTM D256.
13 . A method of preparing a thermoplastic resin composition, comprising kneading and extruding, at 180 to 300° C. and 80 to 400 rpm, an alkyl acrylate-aromatic vinyl compound-vinyl cyanide compound graft copolymer (A) comprising a seed obtained by polymerizing 35 to 58% by weight of an alkyl acrylate and 42 to 65% by weight of an aromatic vinyl compound, a rubber core formed to surround the seed and obtained by polymerizing 78 to 91% by weight of an alkyl acrylate and 9 to 22% by weight of an aromatic vinyl compound, and a graft shell formed to surround the rubber core and obtained by polymerizing 65 to 82% by weight of an aromatic vinyl compound, 12 to 30% by weight of a vinyl cyanide compound, and 3 to 15% by weight of an alkyl acrylate; and a non-graft copolymer (B) comprising an alkyl (meth)acrylate, an alkyl-substituted styrene-based compound, and a vinyl cyanide compound, wherein the graft copolymer (A) satisfies both Equations 1 and 2 below:
180
≤
2
*
r
2
≤
300
[
Equation
1
]
25
≤
r
2
-
r
1
≤
45
,
[
Equation
2
]
wherein, in Equations 1 and 2, r1 is a thickness (nm) from a center of the graft copolymer to the seed, and r2 is a thickness (nm) from a center of the graft copolymer to the core.
14 . The method according to claim 13 , wherein, in the kneading and extruding, an alkyl acrylate-aromatic vinyl compound-vinyl cyanide compound graft copolymer (C) containing a rubber core having an average particle diameter of 50 to 150 nm is comprised.
15 . A molded article, comprising the thermoplastic resin composition according to claim 2 .