PELLETIZED ADDITIVE BLENDS WITH HIGH EXTRUSION THROUGHPUT RATE

摘要

A melt extrusion process for producing pelletized 100% additive blends using additives with lower Hausner ratio and larger particle size with granular form, compared to powder form of additives; also additive blends produced by such process. Extrusion throughput rate is increased using granular additive particle form with lower Hausner ratio than that of powder form. The productivity and efficiency of the process is enhanced by using a larger particle size of additives. Additive blends and polymer stabilization agent blends can be added in post-polymerization processes in resin manufacturing plants to enhance the processing and performance properties of polymers.

主权项

1. A method for preparing dust-free 100% additive blend pellets using melt extrusion, comprising:
blending two or more additives to produce an additive blend, wherein the additives are in free-flowing granular form having a large median particle size, wherein the solid additives have a Hausner ratio of between about 1.02 and about 1.25, and wherein the additive blend consists of 100% additives; feeding the additive blend to an extruder feed hopper, the said extruder having controlled temperature zones; controlling the temperature zones of the extruder so that at least one additive is melted; extruding a homogeneous mixture of additives from the extruder at a high throughput rate to produce partially or fully molten strands by passage through a die; and cooling followed by cutting the homogeneous strand of additive blend into solid pellets which are substantially dust-free.