| 摘要 |
<p>The utilization of an air classifier process is effective in separating out fine-sized particles (that is, particles having a size generally less than 75 microns) from a composition of mass produced polyvinyl chloride (PVC) or PVC copolymer resin thereby producing so called normal-sized mass PVC resin particles. Such resultant normal mass PVC resin (fine free) contains very little, if any residual glassy particles and can be utilized for making thermoplastic bottles and other articles requiring low residual vinyl chloride monomer. The removal of the fines also improves the bulk handling characteristics of the normal mass PVC resin. The separated fines constitute a novel blending or extender resin and hence can be utilized in association with a PVC dispersion resin to form a plastisol. The extender resin can also be utilized as a sintering resin, as a drying resin for plasticized dry blends or as an antiblocking resin for PVC compounds.</p> |
