Achieving LDPE Coating Adhesion to Clay-Coated Board at Reduced Melt Temperatures Using Calcium Carbonate Addition, 2000 Polymers, Laminations & Coatings Conference Proceedings
F. A. Ruiz--An LDPE-based pelleted calcium carbonate (CaCO3) concentrate was used to add 30wt.% fine-ground, surface-treated mineral to a 5.0 MI, 0.923r autoclave-process LDPE homopolymer. This dry blend was extrusion coated onto flame-treated clay-coated board. Conventional aqueous-based polyethylenimine (PEI) primer coating of the board was used as the control.
The combined flame pretreating of the board plus the addition of 30wt.% CaCO3 to the LDPE coating resin yielded fiber-tear adhesion equivalent to that achieved with primer coating. This adhesion was achieved without major changes in extrusion conditions or web neck in. Calcium carbonate addition allowed polymer melt temperature to be reduced to as low as 570° F before loss in fiber-tear adhesion.
Achieving LDPE Coating Adhesion to Clay-Coated Board at Reduced Melt Temperatures Using Calcium Carb
