Abstract
Mineral particles intended for the coating of paper and board were surface-treated with a copolymer based on styrene and acrylic acid. The mineral pigment used was ground CaCO3. The polymer was grafted to the mineral by first adsorbing the acrylic acid to the surface and then allowing this monomer to take part in the polymerization with the styrene. The grafting was performed in the aqueous phase, which was considered to be a prerequisite. The surface treatment of the mineral particles markedly improved the surface strength of papers coated with these pigments. This was interpreted as being a result of improved compatibility between the surface-treated pigment and the synthetic binder used in the coating layer. The surface treatment caused some decrease in the gloss of the coated papers but appeared otherwise not to impair important properties of the coated product. To some extent the surface treatment was also applied to kaolin particles. An improvement in the surface strength of papers coated with the modified particles was also observed with this pigment.
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Skeppstedt, A., Mälhammar, G., Enghtöm, G. et al. Use of a polymer-treated mineral pigment in paper coatings. JOURNAL OF MATERIAL SCIENCE 28, 5819–5825 (1993). https://doi.org/10.1007/BF00365187
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DOI: https://doi.org/10.1007/BF00365187