| abstract |
PROCEDURE FOR THE PREPARATION OF FINISHED MOLDING COMPOSITIONS THAT INCLUDE A POLYMER AND A REINFORCEMENT MINERAL CHARGE. IT INCLUDES THE FOLLOWING STAGES: FIRST, THERMOPLASTIC AND THERMOHARDENING POLYMERS, REINFORCEMENT MINERAL CHARGES AND EVENTUALLY A BONDING AGENT ARE MIXED; SECOND, THE VARIOUS CONSTITUENTS OF THE FORMED MIXTURE ARE AGITATED TOGETHER AT ROOM TEMPERATURE IN A CLASSIC POWDER MIXER; AND FINALLY, THE MIXTURE OBTAINED IS HOMOGENIZED BY HOT KNEADING IN AN EXTRUDER WITH ONE OR VARIOUS SCREWS. |