| 摘要 |
PURPOSE:To make the manufacture by simultaneous injection molding possible by making the adhesive force at the interfaces of molded body portions larger by a method wherein homogeneous crosslinked layer is formed at the interface of each molded body portion. CONSTITUTION:Both the inner side and the outer side molded body portions 1 and 2 consist of plastic composition formed by blending high-impact styrene- based polymer, which can be peroxide with hard thermoplastic polymer, which does not be crosslinked with peroxide, such as polystyrene (PS). In addition, the intermediate molded body portion 3 consists of composition formed by adding a proper amount of functional monomer to styrene-butadiene-styrene copolymer (SPS)-based thermoplastic elastomer. In plastic molded body, crosslinked structure with functional monomer as the intermediary is formed between the high-impact PS and the SBS-based elastomer, which are respectively composed of the molded body portions, at the interfaces between the intermediate molded body portion 3 and the inner side molded body portion 1 and between the portion 3 and the outer side molded body portion 2.
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