Abstract
Diacylhydrazines have copper deactivating activity for polypropylene. The multiple regression analysis was made to estimate their activities. That is, sixty-two diacylhydrazines were synthesized and their activities with other physical properties were measured. Among the calculated equations, a second order equation of five physical properties provided the highest accuracy of estimation. Thus, it was shown that the multiple regression analysis can be used as a screening test for copper deactivator efficiency.