POLYOLEFIN MASTERBATCH AND COMPOSITION SUITABLE FOR INJECTION MOLDING

摘要

A MASTERBATCH COMPOSITION COMPRISING (PERCENT BY WEIGHT): A) 50% -90% OF A CRYSTALLINE POLYPROPYLENE COMPONENT COMPRISING: A¹) FROM 25% TO 75% OF A FRACTION HAVING A MELT FLOW RATE MFR¹ OF FROM 0.1 TO 10 G/10 MIN.; AND A¹¹) FROM 75% TO 25% OF A FRACTION HAVING A MELT FLOW RATE VALUE MFR¹ EQUAL TO OR LOWER THAN 100 G/10 MIN.; WHEREIN THE RATIO MFR¹/MFR¹¹ IS FROM 5 TO 60; AND B) 10%-50% OF A COPOLYMER COMPONENT OF ETHYLENE AND AT LEAST ONE C₃-C10 ALPHA-OLEFIN, CONTAINING FROM 15% TO 50% OF ETHYLENE; SAID MASTERBATCH COMPOSITION HAVING A VALUE OF THE INTRINSIC VISCOSITY [N] OF THE FRACTION SOLUBLE IN XYLENE AT ROOM TEMPERATURE EQUAL TO OR HIGHER THAN 3.5 DL/G, IS ADDED TO POLYOLEFIN MATERIALS TO OBTAIN FINAL COMPOSITIONS SUITABLE FOR INJECTION MOLDING.