Patent ID: 6350400
Filing Date: 2002-02-26
Classification: B29C,C08J,C08K

Abstract:
A process for producing products from plasticized thermoplastics by means of an extruder, comprising the following steps:providing a plasticizer and particulate thermoplastic; processing a portion of the plasticizer with the particulate thermoplastic to form a dry blend; feeding resultant dry blend directly to an extruder and heating said dry blend in a first section of said extruder to a temperature of from 50 to 140Â° C.; injecting remaining platicizer, directly into the extruder; mixing the dry blend and and the remaining plasticizer homogeneously in the extruder wherein the resultant mixture is further heated by friction and the mixing is conducted so that the average residence time of the material from the injection of said remaining platicizer to reaching an average temperature of 145Â° C. in the material is from 10 to 120 s, and so that all of the plasticizer is absorbed by the thermoplastic; and wherein the resultant homogeneous mixture made from thermoplastic and plasticizer is heated to a temperature above 145Â° C. and thus plasticized or completely melted; and shaping the resultant plasticized or completely melted mixture to give the desired product.