Effect of dry blending on properties of rigid PVC formulations

PVC resin, unlike most other thermoplastic resins, is an unusable material. Additives such as stabilisers, lubricants, processing aids, impact modifier etc. are added to the basic resin. These additives are to ease processing and to obtain a suitable final product. The ability to modify PVC made it possible to convert it in almost all processing machinery and produce products ranging from flexible rubbery material to a rigid, high impact product. It is the final compound including the additives, coupled with the processing conditions, which determine the properties of the material. The process of blending is therefore of great importance in the processing of PVC polymers. [Continues.]