mLLDPE

mLLDPE stands for metallocene linear low-density polyethylene. It is a class of polyethylene produced with single-site metallocene catalysts, which enable uniform comonomer incorporation and a narrower molecular weight distribution compared with conventional LLDPE. This architecture yields resins that combine clarity, toughness, and processability at low to moderate densities.

Production typically involves copolymerization of ethylene with short-chain or long-chain comonomers such as butene-1, hexene-1 or octene-1 in gas-phase, slurry, or solution processes using metallocene or constrained-geometry catalysts. Densities generally range from about 0.915 to 0.935 g/cm3, and melt flow rates span wide grades to suit film extrusion, casting, or injection molding.

Key properties include a narrow molecular weight distribution and uniform comonomer distribution, which contribute to improved optical clarity, tensile strength and impact resistance, as well as enhanced heat-seal performance in films. The resins are commonly used in extrusion-coated and coextruded films, bags, and stretch or shrink films. They can offer higher stiffness and puncture resistance at comparable densities relative to conventional LLDPE.

Compared with traditional LLDPE, mLLDPE can enable thinner, clearer, and tougher films and better seal integrity, albeit often at higher raw material cost and with sensitivity to processing windows.