HEAT-INSULATING BOX

摘要

PURPOSE:To prevent THE shrinkage of a foam and keep an appearance.quality for a long term by a method wherein a rigid urethane foam loaded with a cyclopentane as a component of a foaming agent and water as an adjuvant foaming agent is foamed to be loaded between an inner box made of a high- nitrile resin composition and a metallic outer box. CONSTITUTION:A graft copolymer and a coplymer are obtained by polymerizing a monomer mixture of 30-50wt.% vinyl cyanide compound and 50-70wt.% aromatic vinyl compound in the presence of a conjugated diene synthetic rubber. A high-nitrile resin composition mixed with an acrylate rubber having 2-4C alkyl is molded into an inner box 6. The inner box 6 is coated with the coplymer obtained by polymerizing a monomer mixture of 30-50wt.% vinyl cyanide compound and 50-70wt.% aromatic vinyl compound. A rigid urethane foam 5 loaded with a cyclopentane as a foaming agent and 1 part or more water as an adjuvant foaming agent is foamed to be loaded between the inner box 6 and a metallic outer box 3.