A PROCESS FOR PRODUCING PLASTICIZED POLYVINYL CHLORIDE (PVC) HAVING IMPROVED RESISTANCE TO LEACH PLASTICIZER

摘要

Process for prodLlcing plasticized polyvinyl chloride (PVC5 having improved resistance to leach plasticizer t.lhich comprises preparing a hydroxyl terminated polyurethane prepolymer (component A) by reacting cycloaliphatic diisocyanate and a polyol component at a temperature of tei to 15ei C, in the presence of a tin catalyst to obtain component A, and drying said component A; subjecting said dried component A to the step of treatment with a diisocyanate (component B) at a temperature of 40 to 100 C to obtain resinoLls prepolymer adhesive; subjecting a cleaned and dried PVC material to a step of treatment with said prepolymer adhesive to obtain coated PVC products, curing said coated PVC products, cleaning and drying to obtain treated plasti- cized polyvinyl chloride.