Olefin polymerization using chromium on fluorided aluminophosphate

摘要

Ethylene polymer is particularly suitable for the production of tough film is produced under slurry conditions using a fluorided aluminophosphate support and a reaction temperature within the range of 93 DEG to 107 DEG C. in the presence of hydrogen and a small amount of trialkyl boron cocatalyst wherein said aluminophosphate has a phosphorous to aluminum ratio within the very narrow range of 0.15 to 0.4 and wherein said aluminophosphate carrying chromium catalyst is being activated at a temperature within the range of 482 DEG to 704 DEG C. The resulting film is not only substantially superior to film made from the best of the readily available commercial resins but is also better than film made from polymers using a similar catalyst system without the specific combination of parameters of this invention.