Thermoplastic resin composition including maleimide-based heat-resistant copolymer and molded product using same

Abstract

This disclosure relates to a thermoplastic resin composition comprising (A) 60 to 85 wt % of a (meth)acrylic resin, (B) 10 to 30 wt % of an acrylic graft copolymer, and (C) 5 to 10 wt % of a maleimide-based heat-resistant copolymer and a molded product using the same.

Claims

1. A thermoplastic resin composition, comprising: (A) 60 to 85 wt % of a (meth)acrylic resin; (B) 10 to 30 wt % of an acrylic graft copolymer; and (C) 5 to 9 wt % of a maleimide-based heat-resistant copolymer, wherein the maleimide-based heat-resistant copolymer (C) is a terpolymer comprising 15 to 25 wt % of a component derived from N-phenyl maleimide, 65 to 75 wt % of a component derived from styrene and 5 to 10 wt % of a component derived from maleic anhydride, each based on a total weight of the maleimide-based heat-resistant copolymer (C).

2. The thermoplastic resin composition of claim 1, wherein the (meth)acrylic resin (A) has a glass transition temperature (Tg) of greater than or equal to 110° C.

3. The thermoplastic resin composition of claim 1, wherein the (meth)acrylic resin (A) has a weight average molecular weight of 50,000 to 300,000 g/mol.

4. The thermoplastic resin composition of claim 1, wherein the (meth)acrylic resin (A) is a polymer of (meth)acrylate monomers comprising a C1 to C10 alkyl group.

5. The thermoplastic resin composition of claim 1, wherein the (meth)acrylic resin (A) is poly(methyl methacrylate) (PMMA).

6. The thermoplastic resin composition of claim 1, wherein the acrylic graft copolymer (B) comprises 40 to 65 wt % of an acrylic rubbery polymer based on a total weight of the acrylic graft copolymer (B).

7. The thermoplastic resin composition of claim 6, wherein the acrylic rubbery polymer is an alkyl acrylate-based rubber.

8. The thermoplastic resin composition of claim 1, wherein the acrylic graft copolymer (B) is an acrylonitrile-styrene-acrylate graft copolymer (g-ASA).

9. The thermoplastic resin composition of claim 1, wherein the maleimide-based heat-resistant copolymer (C) has a glass transition temperature of 150° C. to 220° C.

10. The thermoplastic resin composition of claim 1, wherein the maleimide-based heat-resistant copolymer (C) has a weight average molecular weight of 80,000 to 200,000 g/mol.

11. A molded product using the thermoplastic resin composition of claim 1.

12. The molded product of claim 11, wherein the molded product has a Vicat softening temperature of greater than or equal to 99° C.; a transmittance of greater than or equal to 40%; and an Izod impact strength of greater than or equal to 7 kgf.Math.cm/cm.

13. The thermoplastic resin composition of claim 1, wherein the thermoplastic resin composition comprises (C) 5 to 8 wt % of the maleimide-based heat-resistant copolymer.

Description

EXAMPLES 1 TO 5 AND COMPARATIVE EXAMPLES 1 TO 8

(1) The thermoplastic resin compositions of Examples 1 to 5 and Comparative Examples 1 to 8 were prepared according to the component content ratios shown in Table 1.

(2) In Table 1, the components (A), (B), and (C) of the thermoplastic resin composition are expressed as wt % based on a total weight of the components (A) to (C).

(3) Equally based on 100 parts by weight of the components (A) to (C) described in Table 1, 0.3 parts by weight of a hindered phenol-based heat stabilizer, 0.02 parts by weight of a silicon-based impact-reinforcing agent, and 0.8 parts by weight of an HALS-based ultraviolet (UV) stabilizer as other additives were respectively added thereto and then, melted/kneaded to prepare pellets. A twin-screw extruder having L/D=29 and a diameter of 45 mm was used for extrusion, and a barrel temperature was set at 230° C.

(4) The manufactured pellets were dried at 80° C. for 4 hours and molded into a size of 100 mm×100 mm×3.2 mm to obtain specimens for measuring properties. Herein, a 6 oz injection molding machine was used, and a cylinder temperature was set at 220° C., and a mold temperature was set at 60° C.

(5) TABLE-US-00001 TABLE 1 Examples Comparative Examples 1 2 3 4 5 1 2 3 4 5 6 7 8 (A) PMMA 65 64 63 62 61 70 68 66 64 62 68 60 58 (Meth)acrylic resin (B) g-ASA 30 30 30 30 30 30 30 30 30 30 30 30 30 Acrylic graft copolymer (C) PMI- 5 6 7 8 9 — — — — — 2 10 12 Maleimide- MAH- based heat- SM (C) resistant PMI- — — — — — — 2 4 6 8 — — — copolymer MAH-SM (C′)

(6) Each composition shown in Table 1 is illustrated as follows.

(7) (A) Poly(Methyl Methacrylate) Resin (Manufacturer: Arkema, Tradename: V40)

(8) A poly(methyl methacrylate) (PMMA) resin having a glass transition temperature of about 120° C. and a weight average molecular weight of about 100,000 g/mol was used.

(9) (B) Acrylonitrile-Styrene-Acrylate Draft Copolymer (Manufacturer: Lotte Advanced Materials Co., Ltd.)

(10) An acrylonitrile-styrene-acrylate graft copolymer (g-ASA) comprising about 60 wt % of a butyl acrylate rubber having an average particle diameter of about 300 nm, wherein a copolymer of styrene and acrylonitrile in a weight ratio of about 7:3 was copolymerized with the butyl acrylate rubber, was used.

(11) (C) N-Phenyl Maleim Ide-Maleic Anhydride-Styrene Copolymer (Manufacturer: Polyscope, Tradename: IZ0721M)

(12) An N-phenyl maleimide-maleic anhydride-styrene (PMI-MAH-SM) copolymer having a weight average molecular weight of about 150,000 g/mol and a glass transition temperature of about 177° C. was used. The copolymer included about 21 wt % of a component derived from N-phenyl maleimide, about 7 wt % of a component derived from maleic anhydride, and about 72 wt % of a component derived from styrene.

(13) (C′) N-Phenyl Maleimide-Maleic Anhydride-Styrene Copolymer (Manufacturer: Denka, Tradename: MS-NB)

(14) An N-phenylmaleim ide-maleic anhydride-styrene (PMI-MAH-SM) copolymer having a weight average molecular weight of about 125,000 g/mol and a glass transition temperature of about 206° C. was used. The copolymer included about 49 wt % of a component derived from N-phenyl maleimide, about 2 wt % of a component derived from maleic anhydride, and about 49% of a component derived from styrene.

(15) Experimental Examples

(16) The results of the following experiments are shown in Table 2.

(17) (1) Coloring Properties (%): transmittance of specimens having a thickness of 3.2 mm and a size of 100 mm×100 mm was measured by using an NDH-7000 equipment made by GNB Tech. Higher transmittance means more transparency, which verifies excellent coloring properties.

(18) (2) Impact Resistance (kgf.Math.cm/cm): Notched Izod Impact strength of ¼″-thick specimens was measured according to ASTM D256.

(19) (3) Heat Resistance (° C.): A Vicat Softening temperature (VST) was measured according to ASTM D1525.

(20) TABLE-US-00002 TABLE 2 Examples Comparative Examples 1 2 3 4 5 1 2 3 4 5 6 7 8 Transmittance 45.03 43.42 41.86 40.29 39.36 58.17 46.12 35.18 27.83 21.85 52.62 38.02 33.21 Izod Impact 7.1 7.1 7.2 7.5 7.3 7.3 7.4 6.9 6.7 6.3 7.5 7.0 6.8 strength VST 99.0 99.1 99.7 100.2 100.5 96.8 98.0 100.4 101.6 103.7 97.7 101.0 101.8

(21) Referring to Tables 1 and 2, the thermoplastic resin compositions according to the example embodiments of the present invention exhibited Izod Impact strength of greater than or equal to 7 kgf.Math.cm/cm and simultaneously, satisfied VST of greater than or equal to 99° C. and transmittance of greater than or equal to 40%. Accordingly, (A) the (meth)acrylic resin, (B) the acrylic graft copolymer, and (C) the maleimide-based heat-resistant copolymer may be used in optimal amounts to secure excellent transmittance and thus realize thermoplastic resin compositions having improved coloring properties, impact resistance, and heat resistance.

(22) Hereinbefore, the certain exemplary embodiments of the present invention have been described and illustrated, however, it is apparent to a person with ordinary skill in the art that the present invention is not limited to the exemplary embodiment as described, and may be variously modified and transformed without departing from the spirit and scope of the present invention. Accordingly, the modified or transformed exemplary embodiments as such may not be understood separately from the technical ideas and aspects of the present invention, and the modified exemplary embodiments are within the scope of the claims of the present invention.