Meaning
Thermoplastic resin used as the delivery medium for pigments and functional additives in a masterbatch formulation. A polyolefin carrier must possess a melt flow index that allows for rapid and uniform distribution within the base polymer during processing. Typical materials include low density polyethylene or polypropylene grades.
Melt Consistency
The thermal behavior of the carrier resin determines how easily the concentrate melts and mixes with the main production resin. If the carrier has a significantly higher melting point than the base polymer, the additives may remain trapped in solid pellets. Choosing a resin with a slightly lower viscosity than the target material improves the overall blending efficiency.
Dispersion Efficiency
Encapsulating pigments within a compatible plastic matrix allows for a more controlled introduction of colour than using raw powders. The polyolefin carrier protects sensitive additives from environmental degradation and prevents them from clumping during storage. This method ensures that the final product reaches its intended performance level without the need for aggressive mechanical mixing.
Resin Affinity
Compatibility between the carrier and the host resin is essential to maintain the structural integrity of the moulded part. Using a polyethylene carrier in a polypropylene part is generally acceptable, but large mismatches can lead to delamination or reduced impact strength. Engineers select the carrier grade to match the chemical family of the production resin to ensure a stable and homogeneous final blend.
