Comparison of Primer Coating and Calcium Carbonate Additive Methods of Achieving LDPE Coating Adhesion to Clay-Coated Board, 1999 Polymers, Laminations & Coatings Conference Proceedings
F. A. Ruiz
Heritage Plastics, Inc.
1002 Hunt Street
Picayune, MS 39466 USA
An LDPE-based pelleted calcium carbonate (CaCO3) concentrate was used to add 30wt.% fine-ground, surface-treated mineral to a 5.0 MI, 0.923 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 reduced coating COF, increased coating surface energy, and in this test allowed the reduction of melt temperature by 5 C (10 F) while still yielding fiber tear adhesion.
Comparison of Primer Coating and Calcium Carbonate Additive Methods of Achieving LDPE Coating Adhesi
