Poly(vinyl chloride) or PVC as it is more commonly known, is the third largest thermoplastic produced in the world. Most is produced using synthesis in suspension polymerization or, in some cases, emulsion & bulk polymerization are used. ‘Natural’ PVC is a rigid structure which means plasticizers are an essential component in the PVC formulation to determine flexibility of the final product.
PVC is largely used in construction applications such as pipes, floors, window frames, sidings, roofs & electrical cable, though its uses are far wider stretching to industries such as toys, fashion & furniture.
High performance antioxidants for PVC
PVC will release HCl upon degradation so thermal stabilizers, typically heavy metal derivatives & metallic soaps, are added to efficiently trap the HCl during processing. Phenolic antioxidants such as LOWINOX® GP45 phenolic antioxidant stabilizer are often added as a chain stopper to terminate the reaction at the end of polymerization. These antioxidants carry the added benefit of helping prevent discoloration of the PVC powder during the drying process. SI Group™’s LOWINOX® CA22-50D phenolic antioxidant stabilizer is a water dispersion specifically designed for both PVC suspension & emulsion polymerization.
High performance light stabilizers for PVC
In PVC end applications requiring light stability of the product, SI Group™ LOWILITE® 22 , LOWILITE® 27, LOWILITE® 28 & LOWILITE® 55 UV absorbers are effective used alone or in combination with hindered amine light stabilizers such as LOWILITE® 94 HALS.