BASELL'S POLISH ACTIVITIES. Poland has evolved into a highly attractive country for foreign investors. One prominent example is Besell, which, in the form of the joint venture Basell Orlen Polyoiefin Sp. Z.o.o (BOP), remains the only producer of polyolefins in Poland Through its latest investments and new technologies, the company is facing up to the expected marked rise in polyolefin consumption in Poland in the next few years.