Masterbatch composition

A masterbatch composition comprising a colorant, a thermoplastic carrier, a metallocene polymer processing aid and greater than 5% to about 60% by weight of an additive, wherein said additive is selected from the group consisting of antioxidants, ultraviolet light absorbers, and light stabilizers.

A process for making a masterbatch composition comprising the steps of:

• a) mixing a colorant, a thermoplastic carrier, and a metallocene polymer processing aid, wherein said metallocene polymer processing aid is a substantially amorphous metallocene polypropylene polymer or copolymer;
• and
• b) applying heat and shear to said mixture whereby said pigment disperses in said mixture to form said masterbatch composition.

A process for making a colorized polymer comprising the steps of:

• a) introducing a masterbatch composition to a melt-processible polymer to form a processable polymer composition, wherein said masterbatch composition comprises a pigment, a thermoplastic carrier, a metallocene polymer processing aid and, greater than 5% to about 60% by weight of an additive, wherein said additive is selected from the group consisting of antioxidants, ultraviolet light absorbers, and light stabilizers;
• and
• b) processing said polymer composition to form said colorized polymer.