Abstract: 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 polyolefins having a melting range, measured by means of differential scanning calorimetry at a heating rate of 10° C./min, within the range of 95 to 170° C. and optionally other polyolefins and/or additives so as to form a homogeneous mixture having a melt temperature within the range of 120 to 160° 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.

Abstract: Process for the preparation of a compound of general formula (II) wherein R1 and R2 independently are hydrogen or a hydroxy- or hydrocarbyl group; or wherein R1 and R2 together are a double bonded oxygen; R3 is hydrogen; R?4 is a nitrobenzophenone none group; and R5 and R6 independently are hydrogen or a hydroxy- or hydrocarbyl group; from a compound of general formula (I) wherein, R1, R2 R3, R5 and R6 are as defined above and R4 is hydrogen; wherein the compound of formula (I) is reacted under alkaline conditions with 2-chloro-5-nitrobenzophenone in the presence of an alkanolic solvent and the compound of formula (II) is directly crystallized from this alkanolic solvent. Complex of an alkanol and a compound of general formula (II) obtainable from the above process and processes wherein the above process or complex are used.