| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a high performance composition for a sealing material that excels in the sealability of a coating part, and in which the bleed-out of polybutene from the coating part is controlled even at the long-term service as for a composition for a sealing material including polybutene. <P>SOLUTION: The composition for a sealing material includes: (a) 2-20 pts.mass of polyethylene having the density of 0.916-0.930 g/cm<SP POS="POST">3</SP>, and the MFR of at least 4; (b) 98-80 pts.mass of polybutene having the number average molecular weight of 700-10,000; and (c) 2-20 pts.mass of a hydrocarbon resin (the total of (a), (b), and (c) is assumed to be 100 pts.mass), wherein the oil separation degree at 60°C is at most 0.1% for one week. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
