| 摘要 |
PROBLEM TO BE SOLVED: To provide a manufacturing method capable of obtaining a cushioning material 1 having a pattern composed of two or more regions of different color tinges such as a natural stone. SOLUTION: The cushioning material 1 having a matrix 2 and granular bodies 3 which are dispersed in the matrix 2. The matrix 2 is gray and the granular bodies 3 are black. A pattern akin to that of granite is formed by the granular bodies 3. In order to manufacture the cushioning material 1, a foaming agent and a first base polymer are kneaded to obtain a first polymer composition. Then, the first polymer composition is pulverized to obtain the granular bodies 3. Thereafter, the granular bodies 3, the foaming agent 3 and a second base polymer having a lower softening point than that of the first base polymer are kneaded to obtain a second polymer composition composed of the granular bodies 3 and the matrix 2 which are mutually different in the color tinge. Then, the second polymer composition is heated to foam the foaming agent in the granular bodies 3 and the foaming agent in the matrix 2. COPYRIGHT: (C)2004,JPO |
