FREMGANGSMAATE TIL FREMSTILLING AV EN POLYPROPYLEN-FORMMASSE.

摘要

A propylene block copolymer having a high comonomer content is obtained by carrying out the second polymerisation step in a monomer mixture in the supercritical state. The product has low tack since the polymer particles do not bake together or adhere to the reactor wall, and excellent impact strength at very low temperatures.