| 摘要 |
<p>PURPOSE:To prepare a granular substance with a high filler content having uniform particle size distribution, by mixing and stirring a filler, crystalline polyolefin powder and a binder having a m.p. lower than that of said polyolefine powder at a specific temp. CONSTITUTION:To 60-90pts.wt. filler (e.g., Al2O3, TiO2)(A) with an average particle size of 0.05-100mu, 5-35pts.wt. crystalline polyolefine powder (e.g., granular polypropylene) (B) having an average particle size (d<a>50) of 150-1,000mu and uniform particle size distribution wherein the powder having a paticle size of (1/2-2) d<a>50 accounts for 90wt% or more and 5-35pts.wt. binder (e.g., atactic polypropylene)(C) having a m.p. 10 deg.C or more lower than that of component B are used as nuclei of a granule and these three components are mixed and stirred at a temp. lower than the m.p. of component B and higher than that of component C to prepare a filler granule wherein filler concn. is 60wt% or more and a proportion of the granule having a particle size of (1/3-3)d<a>50 (where d<a>50 is an average particle size of the granule) is 30wt% or more.</p> |
