| abstract |
An anti-blocking agent for synthetic resin films comprising secondary particles of hydrotalcites having an average secondary particle diameter falling in the range of 1 to 8 µm, said hydrotalcites being represented by the following formula (1)n in which M 2+ stands for Mg 2+ or Mg 2+ and Zn 2+ , A n- stands for an anion of n valence, and x and m stand each for a positive number satisfying the following formula: 0.2≦x<0.5, 0≦m<1. |