Patent ID: 6340717
Filing Date: 2002-01-22
Classification: B29C,C08J

Abstract:
Process for producing foamed polyolefin-based plastics blocks bycrosslinking a matrix comprising a) from 51 to 97% by weight of one or more polyolefins, selected from the group consisting of polyethylene and ethylene copolymer, b) from 3 to 20% by weight of a foaming agent, using &bgr;-radiation of energy >6 MeV, where the thickness of the matrix is from 25 to 45 mm, the radiation dose is from 20 to 150 kJ/kg, and during the irradiation, atmospheric oxygen is at least substantially prevented from reaching the surface of the matrix, foaming the crosslinked matrix by heating to a temperature >160Â° C. and decomposing the blowing agent.