Amorphous Poly Alpha Olefin Based Hot Melts

摘要

1. Starting in the mid- to late-1950s, atactic polypropylene was a by-product of the synthesis of isotactic polypropylene (iPP). 2. First and early second generation Ziegler-Natta (Z-N) catalysts, typically produced 10-15 wt% of APP. 3. Most of the processes using those catalysts were carried out in slurry or in solution, simplifying the elimination of the APP. 4. In other processes, the APP had to be eliminated from the isotactic fraction by washing/extracting with hydrocarbon solvents.