| 摘要 |
PURPOSE:To provide the titled expanded material having excellent sound absorbing qualities and resistance to flame and chemicals and suitable for use as a flooring material for automobile, by impregnating a foam with a dispersion contg. fine particles of lamellar clay mineral to form the film of said fine particle on the inner surfaces of the cells of the foam and on the surface thereof. CONSTITUTION:A foam (e.g. expanded asphalt foam) is immersed in an aq. dispersion contg. lamellar clay mineral (e.g., vermiculite) and a binder (e.g. water-soluble urea resin). Pressurizing and pressure release are repeated in the dispersion to replace air in the cells of the foam by the dispersion. The foam is then dried to form the film of said fine particle of the clay mineral on the inner surfaces of the cells and on the surface of the foam.
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