With the growing concern regarding VOC and HAPs emissions, waterborne traffic paints are finding increased acceptance and have one of the highest growth rates in the coatings industry. Slower dry times associated with waterborne systems have generated performance concerns like tire pick-up and washout by rain. These concerns have fueled the search for efficient, faster film forming aids. To gain more insight on the effectiveness of acetate esters of oxo alcohols as coalescing aids in this application, studies were carried out on five alkyl acetates of varying molecular weights. Two traditional coalescers were included in the study for reference. The relationship of coalescent physical and chemical properties to proper film formation is examined. Results of traffic paint tests on finished paints formulated with the various coalescers are detailed. The effect of adding C_9-C_(11) aromatics to reduce the cost of the coalescer package is also reviewed.
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