High performance mineral reinforcement concentrate for LLDPE and HMW-HDPE blown film extrusion

摘要

LLDPE-based pelletized calciumcarbonate (CaCO_3) concentrates utilizing two different viscosity base resins were used toadd up to 20 wt% fine-ground,surface-treated CaCO_3 as mineral reinforcement to LLDPE and HMW-HDPE films.Film was extruded and converted into institutional canliners on production equipment.Concentrates based on higher viscosity resins yielded superior impact and tensile performance compared to those based on lower viscosity resins.No problems with dispersionwere noted.Slightly higher melt pressure and motor current were observed,but they were still well within typical extrusion process conditions for thetype of base resins used.