| 摘要 |
<p>Plasticized polyvinyl chloride particles are prepared by dispersing a plasticol in an agitated liquid medium immiscible therewith maintained at about 100 DEG -140 DEG F. The liquid medium is agitated so that the plastisol is dispersed as small droplets of essentially spherical form having a particle size not exceeding about 0.03 inch. The liquid medium is then heated to a temperature above about 150 DEG F, e.g., up to about 350 DEG F but advantageously to a temperature up to the boiling point of the liquid medium, to achieve gelation of the plastisol droplets, which are then separated from the liquid medium. The resulting plasticized particles are of essentially spherical form and have an advantageously narrow particle size distribution range. The particles are essentially dust free and have highly desirable free flowing characteristics. Blends of two or more plastisol compositions, e.g., of different color, can readily be obtained.</p> |
