Tetraethyl orthosilicate-containing dispersion coating — water vapor and liquid water barrier properties, TAPPI Journal September 2021

Application: This work presents a feasible solution applicable within the conventional paper/paperboard coating process. It provides a new and effective approach and methodology to barrier coating on paper/paperboard to enhance the water vapor transmission rate (WVTR) and Cobb performance properties for use in packaging and other applications.

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Author: Beko Mesic, Mathew J. Cairns, James H. Johnston, and Meeta Patel
Tetraethyl orthosilicate-containing dispersion coating
ABSTRACT: An aqueous styrene-butadiene latex dispersion coating containing in-situ processed tetraethyl orthosilicate (TEOS) applied on paperboard demonstrated improved water barrier performance. Coatings containing TEOS equivalent to 0.8% silicon dioxide (SiO2; dry basis) exhibited water vapor performance of < 25 g/m2/day (23°C, 50% relative humidity [RH]) and liquid water barrier performance Cobb 1800 s of < 6 g/m2, when applied as a single-layer 18 g/m2 coating. Cobb 1800 s barrier performance was still good (< 11 g/m2) at coat weights of 7•10 g/m2. The use of filler materials such as kaolin improved the vapor barrier properties of the coating, but this was not critical to the liquid water barrier properties.

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