| 摘要 |
PURPOSE:To obtain an urethane foam, having different hardnesses and suitable as cushioning materials, by impregnating part of a flexible urethane foam with a specific impregnant consisting of an organic polyisocyanate, etc., and curing the above-mentioned part. CONSTITUTION:Part of an open-cell flexible urethane foam is impregnated with an impregnant obtained by blending an organic polyisocyanate, e.g. methylene diisocyanate, etc., and/or terminal isocyanate prepolymer consisting of an organic polyisocyanate and polyhydroxyl compound with 2-pyrrolidone and, as necessary, an organic solvent, e.g. methylene chloride, etc., and the impregnated part is then brought into contact with water or steam and cured.
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