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AQ™ 38S Polymer
AQ™ 38S is a water-dispersible sulfopolyester polymer used as a film former in primer, coating, and ink applications.
Eastman AQ™ 38S is a sulfopolyester polymer easily dispersed in water without emulsifying agents, surfactants, or cosolvents. The AQ™ 38S polymer has a Tg of 38°C and forms highly flexible films.
Compared to other water-soluble polymers, such as PVP and PVOH, Eastman AQ™ 38S forms extremely small, negatively charged aggregates when dispersed in water. These aggregates are much smaller than particles in typical polymer emulsions and latexes, allowing for a dispersion to be made without the need for surfactants or dispersants and permitting rapid film formation. In addition, this lends to a low minimum film formation temperature and faster drying times, making AQ™ 38S a highly efficient film former in various formulations.
Eastman AQ™ 38S features excellent adhesion to materials such as paper, plastic film, wood, and textiles, which are common substrates for coatings and inks. In these applications, AQ™ 38S also contributes to high gloss and dispersion capacity for pigments.
Specifications
Form: Pellets Color: Pale amber Glass transition temperature (Tg), (°C): 35–38 Inherent viscosity (dL/g): 0.32–0.40 Melt viscosity at 200°C (Poise): 9,700 Acid number (mg KOH/g): Less than 2 Hydroxyl number (mg KOH/g): Less than 10 Bulk density (lb/gal): 6.5
Primary Chemistry: Sulfopolyester
Features & Benefits
Easily dispersed in water Forms flexible films that are quick drying Aids emulsification and dispersion of liquid and solid formulation ingredients Adheres well to common packaging films Water and humidity resistant Neutralizing amine is not needed
Problems Solved
Adhesion failure to flexible surfaces Difficult dispersion of polymers in water Slow drying times of water-based coatings, inks, and primers
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