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High solids content for reduced VOC emissions and improved coating efficiency.
Excellent UV resistance and long-term gloss retention in exterior applications.
Good compatibility with common crosslinkers including melamine and polyisocyanates.
Superior flow and leveling characteristics for smooth, defect-free film formation.
Enhanced hydrolytic stability compared to conventional acrylic resins.
Automotive OEM clearcoats and basecoats.
Industrial maintenance coatings for metal substrates.
Architectural high-performance façade coatings.
Plastic coatings requiring adhesion and flexibility.
Can coatings for beverage and food containers.
| Chemical Type | Thermosetting acrylic copolymer |
| Product Form | Liquid resin solution |
| Appearance | Clear, pale yellow liquid |
| Solvent System | Typical blend of xylene, butyl acetate, and glycol ether |
| Solids Content (wt%) | 55–60% |
| Acid Number (mg KOH/g) | 8–12 |
| Weight Average Molecular Weight (Mw) | ~8,000–12,000 g/mol |
| Viscosity (mPa·s, 25°C) | 800–1,500 |
Q1: What is the primary function of Dow A-21 Acrylic Resin in coating and ink formulations?
A: Dow A-21 Acrylic Resin serves as a rheology modifier and stabilizer, helping to control viscosity, prevent pigment settling, and improve gloss and film integrity in solvent-based and high-solids coatings and printing inks.
Q2: Is Dow A-21 compatible with common organic solvents and resin systems?
A: Yes — it demonstrates good compatibility with aromatic and aliphatic hydrocarbons, ketones, esters, and common film-forming resins such as alkyds, epoxy esters, and other acrylics, enabling broad formulation flexibility.
Q3: How should Dow A-21 be incorporated into a formulation to achieve optimal performance?
A: It is typically added during the let-down or post-addition stage under moderate shear, often after pigment grinding. Pre-dispersion in a portion of the solvent or carrier resin is recommended to ensure uniform distribution and avoid agglomeration.
Q4: Does Dow A-21 contribute to final film properties such as hardness or chemical resistance?
A: While not a primary film former, it enhances crosslink density and pigment dispersion stability, which can indirectly support improved hardness development, reduced orange peel, and better resistance to solvents and abrasion in cured films.
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