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Abstract

Provided are: a nucleating agent composition capable of imparting excellent mechanical properties to a molded article containing a polyolefin-based resin; a resin composition containing the nucleating agent composition; the molded article having excellent mechanical properties; and a method for manufacturing the resin composition. The nucleating agent composition is characterized by containing at least one type of a nucleating agent for a polyolefin-based resin, wherein a β crystal fraction ranges from 0.2% to 71% as calculated by the following method. Through the use of a sample sampled from the pellets of the resin composition containing the nucleating agent composition, differential scanning calorimetry is performed according to a predetermined program to find a DSC curve, Q=f(θ), with the horizontal axis being temperature θ(° C.) and the vertical axis being heat flow rate Q(mW), and a baseline, g(θ), thereby obtaining a baseline-corrected DSC curve, Q′=h(θ)=f(θ)−g(θ). Subsequently, according to a predetermined procedure, a line area S_t and a β crystal area S_β are found, thereby calculating the β crystal fraction (%).

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