Method for producing flexible PVC

When extrusion and/or calendering are used in industry to produce products from plasticized thermoplastics, in particular flexible PVC, the PVC powder is treated with the plasticizer and, if desired, with other additives in a combined heating/cooling mixer system to give what is known as a dry blend, or at a higher temperature to give an agglomerated material. This dry blend or agglomerated material may then be processed by conventional extrusion to give the desired products. Preparation of a dry blend usually takes place at a temperature of from about 50 to 100° C., and during this all of the plasticizer penetrates into the individual PVC grains, giving a dry, free-flowing mixture. The invention relates to a process for producing plasticized thermoplastic products, in particular flexible PVC, by means of an extruder wherein a thermoplastic processed with plasticizer to give a dry blend and a plasticizer are combined and heated to form the final product.