| abstract |
PURPOSE:To obtain a composite body wherein the spaces between particles are uniformly filled with a foamed body, by providing in a mold a composition layer having a uniform thickness and containing a foaming agent, a liquid resol type phenol resin, etc., and filling the mold with light-weight particles followed by heating, foaming and setting. CONSTITUTION:A composition containing a liquid resol type phenolic resin (preferably, one having a viscosity of 10-500ps), a foaming agent (e.g. trichloromonofluoromethane, etc.) and a hardening agent (e.g. phenol sulfonic acid, etc.) is applied at least all the surface of a mold to have a uniform thickness. Then after the mold is filled completely with particles (e.g. PS foamable particles, etc.) having preferably a particle diameter of 2.5mm. or more, the mold is heated to allow the particles to foam and harden thereby providing a composite body. |