Solventless Photopolymerizable Paper Coating Formulation for Packaging Applications

Author:

Silva Fábio M.1,Pinto Ricardo J. B.1ORCID,Barros-Timmons Ana1ORCID,Freire Carmen S. R.1ORCID

Affiliation:

1. CICECO—Aveiro Institute of Materials, Chemistry Department, University of Aveiro, 3810-193 Aveiro, Portugal

Abstract

Nowadays, packaging applications require the use of advanced materials as well as production methods that have a low environmental impact. In this study, a solvent-free photopolymerizable paper coating was developed using two acrylic monomers (2-ethylhexyl acrylate and isobornyl methacrylate). A copolymer, with a molar ratio of 2-ethylhexyl acrylate/isobornyl methacrylate of 0.64/0.36, was prepared and used as the main component of the coating formulations (50 and 60 wt%). A mixture of the monomers with the same proportion was used as a reactive solvent, yielding formulations with 100% solids. The coated papers showed an increase in the pick-up values from 6.7 to 32 g/m2 depending on the formulation used and the number of coating layers (up to two). The coated papers maintained their mechanical properties and presented improved air barrier properties (Gurley’s air resistivity of ≈25 s for the higher pick-up values). All the formulations promoted a significant increase in the paper’s water contact angle (all higher than 120 °) and a remarkable decrease in their water absorption (Cobb values decrease from 108 to 11 g/m2). The results confirm the potential of these solventless formulations for fabricating hydrophobic papers with potential application in packaging, following a quick, effective, and more sustainable approach.

Funder

Portugal 2020 through the European Regional Development Fund

CICECO-Aveiro Institute of Materials

national funds

Scientific Employment Stimulus to C.S.R.F.

Publisher

MDPI AG

Subject

Polymers and Plastics,General Chemistry

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