CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to and the benefit of International Application No. PCT/KR2018/016864, filed Dec. 28, 2018, which published as WO 2019/132591 on Jul. 4, 2019, Korean Patent Application No. 10-2017-0184894, filed in the Korean Intellectual Property Office on Dec. 29, 2017, and Korean Patent Application No. 10-2018-0133258, filed in the Korean Intellectual Property Office on Nov. 2, 2018, the entire disclosure of each of which is incorporated herein by reference.

TECHNICAL FIELD

The present invention relates to a thermoplastic resin composition and a molded product produced therefrom. More particularly, the present invention relates to a thermoplastic resin composition, which has good properties in terms of impact resistance, stiffness, flame retardancy, flowability, and the like, and a molded product produced therefrom.

BACKGROUND ART

Thermoplastic resin compositions have lower specific gravity than glass or metal, good formability, and good impact resistance, and are useful for housings of electrical/electronic products, automotive interior/exterior materials, and exterior materials for buildings. Particularly, with the trend toward larger and lighter electrical/electronic products, plastic products produced from thermoplastic resins are rapidly replacing typical glass and metal-based products in the related art.

In recent years, with the development of portable electronic products formed of thermoplastic resin compositions and having compact and lightweight structures, the electronic products are required to have both high impact resistance and high stiffness to prevent damage due to external impact. However, there is a tradeoff between stiffness and impact resistance and it is difficult for a typical thermoplastic resin composition to realize high stiffness and high impact resistance at the same time.

Although various inorganic and organic flame retardants are used for a thermoplastic resin composition in order to improve flame retardancy, use of an excess of the flame retardants can cause deterioration in impact resistance of the thermoplastic resin composition.

Therefore, there is a need for development of a thermoplastic resin composition having good properties in terms of impact resistance, stiffness, flame retardancy, flowability, and balance therebetween.

The background technique of the present invention is disclosed in JP Unexamined Patent Publication No. 2015-059138 A and the like.

DISCLOSURE

Technical Problem

It is one aspect of the present invention to provide a thermoplastic resin composition having good properties in terms of impact resistance, stiffness, flame retardancy, flowability, and the like.

It is another aspect of the present invention to provide a molded product formed of the thermoplastic resin composition.

The above and other aspects of the present invention can be achieved by the present invention described below.

Technical Solution

1. One aspect of the present invention relates to a thermoplastic resin composition. The thermoplastic resin composition includes: about 100 parts by weight of a polycarbonate resin; about 20 parts by weight to about 60 parts by weight of mica surface-treated with a silane compound; about 0.1 parts by weight to about 20 parts by weight of a modified polyolefin including a repeat unit represented by Formula 1 and a repeat unit represented by Formula 2; and about 3 parts by weight to about 20 parts by weight of a phosphorus flame retardant:



where R1is a hydrogen atom or a methyl group, Y is —COOR2(R2being a C1to C12alkyl group), a glycidyl modified ester group, an arylate group, or a nitrile group (—CN).

2. In Embodiment 1, the mica may have an average particle diameter of about 60 μm to about 300 μm and an aspect ratio of about 50 to about 150 in a cross-section thereof.

3. In Embodiment 1 or 2, the modified polyolefin may include about 50 wt % to about 95 wt % of the repeat unit represented by Formula 1 and about 5 wt % to about 50 wt % of the repeat unit represented by Formula 2.

4. In Embodiments 1 to 3, the phosphorus flame retardant may include at least one selected from among a phosphate compound, a phosphonate compound, a phosphinate compound, a phosphine oxide compound, and a phosphazene compound.

5. In Embodiments 1 to 4, the mica and the modified polyolefin may be present in a weight ratio of about 3:1 to about 40:1.

6. In Embodiments 1 to 5, the thermoplastic resin composition may have a notched Izod impact strength of about 3 kgf·cm/cm to about 30 kgf·cm/cm, as measured on a ⅛″ thick specimen in accordance with ASTM D256-10e1.

7. In Embodiments 1 to 6, the thermoplastic resin composition may have a flexural modulus of about 60,000 kgf/cm2to about 90,000 kgf/cm2, as measured on a 6.4 mm thick specimen at a rate of 2.8 mm/min in accordance with ASTM D790.

8. In Embodiments 1 to 7, the thermoplastic resin composition may have a flame retardancy of V-0 or higher, as measured on a 1.5 mm thick specimen by a UL-94 vertical test method.

9. In Embodiments 1 to 8, the thermoplastic resin composition may have a spiral flow length of about 250 mm to about 300 mm, as measured after injection molding in a spiral-shaped 2 mm thick mold under conditions of a molding temperature of 260° C., a mold temperature of 60° C., an injection pressure of 1,500 kgf/cm2, and an injection rate of 120 mm/s.

10. Another aspect of the present invention relates to a molded product. The molded product is formed of the thermoplastic resin composition according to any one of Embodiments 1 to 9.

Advantageous Effects

The present invention provides a thermoplastic resin composition having good properties in terms of impact resistance, stiffness, flame retardancy, and flowability, and a molded product produced therefrom.

