| 摘要 |
PROBLEM TO BE SOLVED: To prepare a polyurethane foam which is not discolored even under the influence of nitrogen oxides, moisture, or the like contained in air. SOLUTION: This foam is prepared by mixing a polyurethane resin with a binchoutan (hard charcoal from oak produced in Wakayame prefecture, gapan) power 3 and foaming and molding the mixture. |
