Abstract
During processing, PVC undergoes a major rheology change leading to a high sticking behaviour on hot metal surfaces well before degradation starts. This sticking behaviour is particularly critical to the final quality of calendered film but also to the surface finish of extruded pieces. Several additives have been designed to promote antisticking but most have drawbacks forcing users to make difficult choices and compromises. Unique acrylic process aids have the ability to promote antisticking without modifying critical PVC characteristics such as PVC gelation, melt rheology or optical properties. The latest developments in antisticking process aids have allowed improvement of the metal release ability and have opened new options to PVC processors like improved processing of high sticking formulations, i.e. high loading copolymer, high viscosity formulations, high temperature and/or high shear processes, formulation cost reduction (reduction of additives loading) and fast throughput production.
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