METHOD FOR PRODUCING A POLYOLEFIN FOAM AND POLYOLEFIN FOAM PRODUCED WITH SAID PROCESS

摘要

The invention relates to a process for producing a polyolefin foam having a higher temperature resistance and comprising a polypropylene and/or polyethylene, which process comprises first mixing and melting one or more polyolefin having a melting range, measured by means of differential scanning calorimetry at a heating rate of 10 DEGREE C/min. within the range of 95 to 170 DEGREE C and optionally other polyolefin and/or additives so as to form a homogeneous mixture having a melt temperature within the range of 120 to 160 DEGREE C, melting said homogeneous mixture in an extruder, mixing said molten mixture with a physical foaming agent and subsequently cooling said mixture so that the molten mixture transfers from the liquid phase into a semi-crystalline phase, and expanding the cooled mixture into a foam. The invention further relates to an insulation foam produced with said process.