Thermoplastic resin composition having high rigidity and low coefficient of linear thermal expansion and molded article comprising same

A thermoplastic resin composition comprising:

• a polypropylene composite resin comprising at least two selected from the group consisting of crystalline polypropylene resulting from polymerization of 0.1 wt % to 10 wt % of an alkylene monomer having 4 to 10 carbon atoms and 90 wt % to 99.9 wt % of a propylene monomer, an ethylene-propylene copolymer resulting from polymerization of 1 wt % to 50 wt % of an ethylene monomer and 50 wt % to 99 wt % of a propylene monomer, and a polypropylene elastomer resulting from polymerization of 20 wt % to 85 wt % of ethylene-propylene rubber and 15 wt % to 80 wt % of homo-polypropylene;
• an elastomer comprising ethylene-α-olefin;
• and
• an inorganic filler,
• wherein the thermoplastic resin composition has a flexural modulus (FM) of 2,500 MPa or more and a coefficient of linear thermal expansion (CLTE) of 60 μm/m·° C. or less,
• wherein the polypropylene elastomer has a melt index (230° C., 2.16 kgf) of 10 g/10 min to 20 g/10 min.