| 摘要 |
<p>"PROCESS FOR THE PRODUCTION OF EXPANDED RETICULATED PO LYETHYLENE" Process for the production of expanded reticulated polyethylene, comprising the steps of: - to melt an ethylene polymer selected among ethylene homopolymers, ethylene copolymers with alpha-olefins, copolymers of ethylene with conjugated diolefins, and related mixtures; - to homogenize said ethylene polymer, in the molten state, with a reticulating agent and an expanding agent, until a homogeneous mixture is obtained; - to give to said homogeneous mixture a solid parallelepiped shape by means of extrusion and subsequent cooling, or by means of moulding; - to place the solid parallelepiped shaped body inside an air-tightly closed container; to pressurize the con tainer by an inert gas and to heat the parallelepiped shaped body to a temperature higher than the decomposition temperature of the reticulating agent and of the expanding agent contained therein; in the absence, or in the substantial absence of expansion; - to depressurize the container, allowing the shaped bo dy to expand to an end volume smaller than the volume of the container; to recover the expanded reticulated item from the con tainer.</p> |
