The invention relates to a nucleating agent of formula (I), wherein residues R1 and R2 are independently selected from substituted phenyl groups, wherein the substituents of said substituted phenyl groups are independently from each other selected from the group consisting of (C1-C4)-alkyl-; and wherein R3 is a -C(O)OR4, -C(O)NR4R5, or -C(O)-NR7-NR5R6 residue, wherein R4, R5, R6, and R7 are independently from each other hydrogen or (C1-C4)-alkyl-.
                            该发明涉及一种具有
化学式(I)的成核剂,其中残基R1和R2分别选自取代苯基,其中所述取代苯基的取代基分别独立于彼此选自以下组成的基团:(C1-C4)-烷基-;并且其中R3是-C(O)OR4,-C(O)NR4R5或-C(O)-NR7-NR5R6残基,其中R4、R5、R6和R7独立于彼此选自氢或(C1-C4)-烷基。