| 摘要 |
An olefinic thermoplastic elastomer capable of producing a sheet applicable for preparing a covering skin sheet for interior furnishings in automobile superior in the formability, heat resistance, mechnical properties, tensile characteristics, strain restorability and repulsive elasticity together with superior grain retention performance upon a male vacuum forming of the sheet, the said olefinic thermoplastic elastomer comprising an olefinic resin and an olefinic copolymer rubber and having a characteristic feature that it satisfies, when a grained sheet made of the said elatomer is subjected to a male vacuum forming at least at a point of sheet temperature within the range of 130-150° C., the condition that the grain retention rate expressed by the proportion of the grain depth of the sheet retained after the male vacuum forming relative to the grain depth before the male vacuum forming represented by percent meets the relation defined by the following equation (1)in which T represents the sheet temperature upon the male vacuum forming.
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