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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.
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- Manufacturer: Eastman
- Product Line: Eastman AQ™ Polyesters
- Product: AQ™ Polymers
- Industries: Adhesives | Coatings | Food & Beverage | Inks
- Authorized Countries: Canada | United States
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Overview
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
Applications
Coatings Inks Primers Overprints
Related Applications
Related Chemistries
Related Functions
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Adhesives
Coatings
Inks
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