| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a polypropylene-based resin preliminary foamed particle and a polypropylene-based resin expansion molding body, wherein when friction is caused between preliminary foamed particles, between expansion molding bodies, or between an expansion molding body and other plastic product, a metal product or the like, a jarring friction sound with a high frequency (squeaking sound) is not generated without causing: rise of molding pressure at molding; deterioration of dimensional accuracy of an expansion molding body; and decrease in mechanical strength. <P>SOLUTION: A polypropylene-based resin preliminary foamed particle includes 2-12 pts.wt of a polyethylene wax whose molecular weight is from 1,000 to 4,000, based on 100 pts.wt of a polypropylene-based resin in which the flexural modulus measured in accordance with JIS K7171 is from 1,300 MPa to 1,700 MPa. <P>COPYRIGHT: (C)2013,JPO&INPIT |
