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

The present invention provides a thermoplastic resin composition having high rigidity and a low coefficient of linear thermal expansion, and a molded article comprising the same. The thermoplastic resin composition includes a suitable first propylene-ethylene copolymer, a second propylene-ethylene copolymer, a thermoplastic elastomer, an inorganic filler, and a sodium phosphate-based nucleating agent, and thus a molded article produced thereby may exhibit improved mechanical rigidity, impact resistance, and dimensional stability. The present invention can impart excellent processability, high tensile strength, high flexural modulus, and high impact strength to a molded article even when the molded article is formed to have a low thickness in order to reduce weight. 本发明提供一种具有高刚性和低线性热膨胀系数的热塑性树脂组合物以及包含该组合物的模制品。该热塑性树脂组合物包含适当的第一丙烯-乙烯共聚物、第二丙烯-乙烯共聚物、热塑性弹性体、无机填料和磷酸钠基成核剂，因而由此生产的模制品可以表现出改善的机械刚性、抗冲击性以及尺寸稳定性。即使为了减轻重量而形成为低厚度时，也可以赋予模制品优异的加工性、高拉伸强度、高弯曲模量和高冲击强度。