Water‐soluble/dispersible cationic pressure‐sensitive adhesives. II. Adhesives from emulsion polymerization

Abstract

ABSTRACT:In our previous work, we reported that cationic water-soluble pressure-sensitive adhesives (PSAs) could be synthesized in ethanol or methanol. These cationic water-soluble adhesives would not cause a stickies problem during paper recycling and can be easily removed from the papermaking system by adsorbing on wood fibers. In this study we report the synthesis and application of waterbased cationic PSAs using miniemulsion polymerization. A redox initiator system of cumene hydroperoxide/tetraethylenepentamine was used to force interfacial polymerization. The end-use properties of the PSAs were evaluated, and the repulpability of the PSAs in paper recycling was studied. It was found that the cationic PSA from miniemulsion polymerization itself was insoluble and nondispersible in water during the paper recycling process. However, if this waterinsoluble cationic PSA from miniemulsion was formulated with a water-soluble cationic PSA made from ethanol, the solubility or dispensability of the former PSA in water was improved. The molecular weight and degree of crosslinking of the PSA polymer have significant effects on the properties and dispersability of PSA.

Water-Soluble Pressure-Sensitive Adhesives Containing Carboxymethyl Starch with Improved Adhesion to Paper

“…The most often used hydrophilic monomers for synthesis of water-soluble acrylic PSA are: acrylic acid, methacrylic acid, β-acryloyloxypropionic acid and 2-hydroxypropyl acrylate [3][4][5][6].…”

Effect of modified phenolic resin on crosslinked network and performances of polyvinyl acetate blending emulsion

“…The research of waterborne adhesives has increased in recent years, because it is a natural polymer or synthetic polymer as a binder and water as a solvent or dispersant, replacing the toxic organic solvents and meeting the environmental regulations that require the removal of volatile organic compounds . The polyvinyl acetate (PVAc) emulsion is one of the major waterborne emulsion adhesives with high bonding strength, excellent color retention, safe, pollution‐free, extensive source of raw materials, low production costs, and so on.…”

Preparation and Characterization of Water-soluble Acrylic Pressure Sensitive Adhesive

“…As the need for environmental protection increases, so has the interest in the protection of forests, and many studies have been conducted on the repulping and recycling of waste paper in the paper industry [1][2][3][4][5][6]. However the recycled fiber has many contaminants such as stickies, low Tg derived from ink, coating material, pressure-sensitive adhesive (PSA), etc., which create problems in paper-making such a sit becoming stuck to the felts, wires, and dryer cylinders of paper machines, thus causing web breaks, reducing production, and lowering the quality of the recycled paper [4].…”

“…Therefore, much research has been completed focusing on sticky control and development of new PSAs. Although stickies can be reduced by treating paper-making machines and adding dispersion agents, when the pH, temperature, concentration, charge, and shear force conditions change, stickies can accumulate on paper machine felt, wire, dryers, and other places [1][2][3][5][6]. So new PSAs for the repulping process must be developed [1][2][3].…”