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Polymers (Basel). 2016 Mar 4;8(3). pii: E75. doi: 10.3390/polym8030075.

Polylactide/Montmorillonite Hybrid Latex as a Barrier Coating for Paper Applications.

Author information

1
Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Applied Wood Materials, Überlandstrassse 129, CH-8600 Dübendorf, Switzerland. dav.bande@gmail.com.
2
Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Biointerfaces, Lerchenfeldstrasse 5, CH-9014 St. Gallen, Switzerland. dav.bande@gmail.com.
3
Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Protection and Physiology, Lerchenfeldstrasse 5, CH-9014 St. Gallen, Switzerland. veronika.meyer@empa.ch.
4
Cham Paper Group Schweiz AG, Fabrikstrasse, CH-6330 Cham, Switzerland. prevost.david@cham-group.com.
5
Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Applied Wood Materials, Überlandstrassse 129, CH-8600 Dübendorf, Switzerland. tanja.zimmermann@empa.ch.
6
Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Biointerfaces, Lerchenfeldstrasse 5, CH-9014 St. Gallen, Switzerland. luciano.boesel@empa.ch.
7
Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Protection and Physiology, Lerchenfeldstrasse 5, CH-9014 St. Gallen, Switzerland. luciano.boesel@empa.ch.

Abstract

We developed a paper coating for the potential application in food packaging based on polylactide and montmorillonite. It is applied to the paper in the form of a stable, water-based latex with a solid content of 25⁻28 wt %. The latex is prepared from a commercially available polylactide, surfactants, montmorillonite, a plasticizer, chloroform (to be removed later) and water by an emulsion/solvent evaporation procedure. This coating formulation is applied to the paper substrate by bar-coating, followed by hot-pressing at 150 °C. The coated papers achieved up to an 85% improvement in water vapor transmission rates when compared to the pristine papers. The coating latex is prepared from inexpensive materials and can be used for a solvent-free coating process. In addition, the ingredients of the latex are non-toxic; thus, the coated papers can be safely used for food packaging.

KEYWORDS:

food packaging; hybrid latex; paper coating; polylactide/montmorillonite hybrid coating; water vapor transmission rate; water-based coating latex

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