| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a door element, having favorable shielding performance to ionizing radiation equal to that of a door element having a lead sheet, and having very low density. <P>SOLUTION: This door element includes: (a) aromatic polyisocyanate; (b) polyol component having an isocyanate reactive group, and containing polyether polyol and polyester polyol; (c) radiation protective agent containing (c1) gadolinium, (c2) barium, indium, tin, molybdenum, niobium, tantalum, zirconium or tungsten, and (c3) bismuth, lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, terbium, dysprosium, holmium, erbium, thulium, ytterbium or lutetium; and (d) a decorative surface sandwiching hard polyurethane foam body which is a reactive product of the foaming agent. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
