Nucleating agent, polyolefin-based resin composition containing same, and molded article thereof

Abstract

Provided are: a nucleating agent capable of simultaneously improving the thermal stability and the transparency of a polyolefin resin; a polyolefin-based resin composition containing the same; and a molded article of the composition. The nucleating agent contains a compound represented by Formula (1) below where R1 to R4 each independently represent a hydrogen atom or a linear or branched alkyl group having 1 to 9 carbon atoms; R5 represents an alkanediyl group having 1 to 4 carbon atoms; and M represents a hydrogen atom or a sodium atom. In this nucleating agent, the mass ratio of phosphorus atoms and sodium atoms, P/Na, is in a range of 1.200 to 1.500.

1 . A nucleating agent, comprising: a compound represented by the following Formula (1): 
       
         
           
           
               
               
           
         
         wherein in Formula (1), R 1  to R 4  each independently represents a hydrogen atom or a linear or branched alkyl group having 1 to 9 carbon atoms; R 5  represents an alkanediyl group having 1 to 4 carbon atoms; and M represents a sodium atom, 
         and a compound represented by the following Formula (1′): 
       
       
         
           
           
               
               
           
         
         wherein in Formula (1′), R 1  to R 4  each independently represents a hydrogen atom or a linear or branched alkyl group having 1 to 9 carbon atoms; R 5  represents an alkanediyl group having 1 to 4 carbon atoms; and M represents a hydrogen atom, 
         wherein a mass ratio of phosphorus atoms and sodium atoms in the nucleating agent, P/Na, is in a range of 1.350 to 1.500. 
       
     
     
         2 . The nucleating agent according to  claim 1 , wherein the mass ratio of phosphorus atoms and sodium atoms in the nucleating agent, P/Na, is in a range of 1.350 to 1.450.