| 摘要 |
PROBLEM TO BE SOLVED: To provide a hollow molded product which has a constitution of using no reinforcing material and has both mechanical strength such as rigidity and impact resistance. SOLUTION: The hollow molded product is obtained by the extrusion of a polyester resin or a polyether resin, and the outer surface part has a lower calorific value of fusion than the other part. The hollow molded product secures the calorific value of fusion, i.e., secures impact resistance and a soft feeling at the outer surface part having a lower crystallinity and, simultaneously, secures the calorific value of fusion, i.e., mechanical properties such as rigidity and resistance to creep at the other part having a higher crystallinity. COPYRIGHT: (C)2004,JPO |
