| 主权项 |
1. A process for extruding polypropylene comprising, in order:
a. extruding a first composition forming a first extrudate, wherein the first composition comprises first polypropylene, a nucleating agent, and a first acid scavenger, wherein the nucleating agent is in an amount of at least about 50 ppm; b. extruding a second composition forming a second extrudate, wherein the second composition comprises second polypropylene and a second acid scavenger, wherein the second acid scavenger is a potassium salt of a fatty acid forming a second extrudate, wherein the second extrudate contains less than about 10 ppm of the nucleating agent. |
