| 摘要 |
PURPOSE:To obtain polypropylene particles of an increased apparent density, by adding a specified amount of a lubricant to polypropylene particles obtained from a polymer. CONSTITUTION:100pts.wt. polypropylene particles of an apparent density of 0.5g/cc, obtained from a polymer, are mixed with 0.01-0.6pt.wt. lubricant. As the polypropylene particles as a starting material, those having a particle size distribution represented by a Rosin-Rammer equation, i.e., equation I, a content of 100mu or smaller particles <1wt% and a content of 1,200mu or larger particles <=1wt% are usually desirable. In the equation, Dp is the diameter (mu) of a particle, R(Dp) is a cumulative oversize residual weight, De is a particle diameter characteristic value and represents the particle diameter corresponding to R(Dp)=36.8wt%, n is a distribution constant, 100<=Dp<=1,200, R(Dp)=0-100, 100<=De<=800 and n>=2.5. |
