| 摘要 |
PURPOSE:To prepare the subject foamed molding homogeneously foamed and crosslinked even in the case of the thick molding by irradiating a molding comprising a crystalline polyolefin and a foaming agent with UV rays under the temperature condition above the melting point of the crystal of the polyolefin. CONSTITUTION:A composition comprising (A) a crystallizable polyolefin (preferably lower polyethylene, high density polyethylene), (B) a foaming agent (e.g. azodicarboxylic amide) and, if necessary, a foaming auxiliary, further a photosensitizer (e.g. benzophenone) or further a crosslinking auxiliary (e.g. triallyl isocyanurate), etc., is coated on a wire, cable, etc., or molded into a cylindrical product such as a tube or pipe or into a flat plate such as a film or sheet and subsequently irradiated with UV rays under the condition above the melting point of the crystal of the component A to provide a crosslinked polyolefin foamed molding having a high crosslinking degree up to the deep part of the molding product. |
