Abstract
AbstractEthylene copolymer resin (ECR) modifiers are solid, high molecular weight, permanent plasticizers for PVC. During the melt compounding step, the low melting ECR (m.p. ∼50°C) melts first forming a relatively low viscosity phase in which the higher melting (Tg ∼80°C) and more viscous PVC powder grains (∼150 μm in diameter) are suspended. Under these conditions, it is sometimes difficult to get enough shear energy into the system to break down, or flux, all of the PVC grains into unagglomerated primary particles (∼1 μm diameter). The remaining grains appear as gel‐like heterogeneities, in the final blend, that can produce rough, pimpled extrudates with reduced physical properties. This paper describes the use of a new experimental process aid that significantly improves homogenization, during the melt compounding process, leading to improved product quality and/or production rates.
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