Process for the production of multi-layer constructed coverings based on polyolefins with foamed intermediate layers

摘要

A process for the production of at least one foamed layer of polyolefins comprising: polymerizing a polyolefin elastomer (POE) or polyolefin plastomer (POP) and optionally one or more additional polyolefins with a metallocene catalyst to form a polymerized polyolefin; mixing said polymerized polyolefin, up to 100 parts by weight of a mineral filling material and from 1-10 parts by weight of a chemical propellant based on 100 parts by weight of said polymerized polyolefins to form a sheet layer mixture; rolling said sheet layer mixture on a multiroller calender to produce a sheet layer; heating at least one sheet layer at a temperature above the decomposition point of the chemical propellant so as to foam the sheet layer and form at least one foamed layer. The present invention is also concerned with new coverings which are produced according to this process.