Water-Based Dispersions

The principle of resin dispersion is based on low molecular weight tackifier resin particles dispersed in an aqueous medium with the aid of a surfractant. Waterborne tackifier resin dispersions are commonly used for pressure-sensitive adhesive (PSA) label, decal, or tape applications based on acrylic emulsion polymers or various types of natural or synthetic rubber latex.   Waterborne tackifier resin dispersions present various benefits: Improve specific adhesion especially to polyolefinic and paper substrates Improve flow and wetting out properties of the adhesives Provide an optimum balance between tack, adhesion and cohesion Increase peel and tack Enhance specific adhesion to low energy and/or high energy surfaces Promote low or high temperature performance Broad compatibility with other formulation components In order to improve the adhesion, and to make the PSA bond on a variety of substrates, suitable waterborne tackifier resins are added. Resin dispersions are used in waterborne contact adhesives to modify green tack and open time. The major uses are general-purpose permanent, removable, deep freeze, wine bottle, and wash-off applications: In Filmic labels, resin dispersions help adhesive manufacturers reduce costs by providing improved specific adhesion to polyolefins coupled with excellent moisture resistance. Aliphatic hydrocarbon resin dispersions are ideal for tackification of natural rubber latex in Specialty label applications. Protective film adhesives based on resin dispersions resulted in a residu-free adhesive with low cohesion.