| abstract |
PURPOSE: To improve the odor of a molded PP by specifying the hexane and/or heptane content and the 2,4-dimethyl-heptene-1 content. n CONSTITUTION: A molded PP obtd. by compounding 100 pts.wt. PP power and/or pellet prepd. by using a Ziegler-Natta catalyst and a hydrocarbon compd. such as hexane and/or heptane as a solvent with 0.01-5 pts.wt. antioxidant (e.g., 2,6-di-t-butyl-p-cresol) and making it into a sheet or a film, and dried at a temp. of 50°C or higher and below the temp. where PP is melted for 2-30hr to obtain a molded PP with a hexane and/or heptane content of 5ppm or less and a 2,4-dimethyl-heptene-1 content of 5ppm or less. n COPYRIGHT: (C)1990,JPO&Japio |