| 摘要 |
PURPOSE:To obtain electrically conductive flame-retardant urethane foam by immersing a polyurethane foam containing polyvinyl chloride in an aqueous solution containing a bivalent copper compound and a reducing agent, and treating in a solution containing a substance capable of releasing sulfur atom. CONSTITUTION:A polyol containing polyvinyl chloride dispersed therein is compounded with a polyisocyanate and additives such as foaming agent, catalyst, foam stabilizer, etc., and the mixture is foamed to obtain a polyurethane foam. The foam is immersed in an aqueous solution containing a bivalent copper compound (e.g. cupric sulfate) and a reducing agent (e.g. metallic copper) or an aqueous solution containing a univalent copper compound (e.g. cuprous chloride), and subsequently or simultaneously to the above process, immersed in a solution containing a compound capable of releasing sulfur and/or sulfur ion (e.g. sodium thiosulfate). The treated foam is washed with water and dried to obtain the objective urethane foam.
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