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In this paper, we aim at a synergism of improvements of impact strength of polypropylene by the addition of β-crystal nucleator and of its rigidity by the addition of α-crystal nucleator. Co-addition of both the nucleators has been studied. 30 ppm of γ-quinacridone which is a β-crystal nucleator and 0 to 10000 ppm of talc (FC), aluminum salt of benzoic acid (BA), or dibenzylidene sorbitol (GA) which are α-crystal nucleators were added to a homo isotactic polypropylene (PP). Flexural and lzod impact test specimens were injection-molded from the PPs under constant molding conditions and the structure and properties have been investigated. Although the α-crystal nucleators scarcely affect the β-crystal content (K value) at nucleator contents below 100 ppm, the K value decreases with increasing nucleator content at contents above 100 ppm. The decrease is in the order of BA &gt; GA &gt; TC Although the lzod impact strength scarcely changes at α-crystal nucleator contents below 100 ppm, it decreases with increasing nucleator content at contents above 100 ppm. The decrease is the larger as the decrease of K value is the larger. The flexural modulus shows a reverse tendency of the lzod impact strength. From above, it may be said that the properties of injection molding of β- and α-crystal nucleator-added PP are unitarily determined by the β-crystal content and thus the expected synergism could not be obtained.

Structure and Properties of Injection Moldings of β-Crystal Nucleator-added PP: Part 5, Co-addition of β- and α-Crystal Nucleators