| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a gradient material of polyolefin with a gradient of the degree of crosslinking, having no interface, easily producible without any limitation on shape and the like. SOLUTION: At least two kinds of uncrosslinked polyolefin having different melt-indexes, is laminated, melted to bond integrally, and then is crosslinked. Further, this crosslinked material is brought into contact with a supercritical water or a subcritical water to react and form the gradient of the degree of crosslinking inside.</p> |
