Abstract: The present invention relates to an insulated pipe and use thereof in systems that require insulated pipes, such as heating systems. The present invention is based on the use, in an insulated pipe, of a foam layer between an inner pipe of said insulated pipe and a vacuum insulation panel surrounding said inner pipe for conferring extended lifetime of the vacuum insulation panel and therewith maintenance of stable insulation values of said insulated pipe in time.

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: The present invention relates to pipe insulation made from a polyolefin thermal insulation foam which is made by extruding, using a physical blowing agent, a foam composition comprising 77-99% by weight of a metallocene polyethylene, 5-18% by weight of a flame extinguisher, 3-8% by weight of a cell stabilizer and 0-5% by weight of other usual foam additives. The invention further relates to a method for preparing a physically foamed polyolefin thermal insulation foam and to the foam prepared therewith. The foam is very flexible and as a result the pipe insulation is particularly suitable for the thermal insulation of pipes for split air conditioning, district heating, solar energy exploitation and the process industry, even when it regards thin and/or twisting pipes. The pipe insulation can be recycled well.