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High molecular weight acrylic copolymer delivering excellent film-forming properties and mechanical strength.
Good compatibility with nitrocellulose, CAB, and other common film formers used in protective and decorative coatings.
Provides outstanding gloss retention, clarity, and UV resistance in clear coat systems.
Enables low-viscosity formulations while maintaining robust resin backbone integrity and solvent release control.
Offers balanced hardness and flexibility for improved scratch and mar resistance in topcoat applications.
Automotive clearcoats and refinish topcoats requiring high-gloss, durability, and weatherability.
Industrial maintenance coatings for metal substrates exposed to outdoor environments.
Wood furniture and cabinetry finishes where clarity, flow, and sandability are critical.
Plastic coatings for automotive interior trim and consumer electronics housings.
General-purpose solvent-borne architectural and OEM coatings requiring rapid drying and film integrity.
| Chemical Type | Acrylic copolymer (methyl methacrylate / butyl acrylate / methacrylic acid) |
| Product Form | Solvent-borne resin solution |
| Appearance | Clear, colorless to pale yellow liquid |
| Solvent System | Butyl acetate / xylene blend |
| Non-Volatile Content | 45–47% w/w |
| Gardner Color | ≤ 2 |
| Acid Number | 10–14 mg KOH/g |
| Viscosity (25°C, #4 spindle, 20 rpm) | 3,000–5,000 cP |
Q1: What is the primary function of PARALOID A-21 in coating formulations?
A: PARALOID A-21 is a solution-grade acrylic resin designed primarily as a rheology modifier and matting agent in solvent-borne and high-solids industrial coatings. It helps control flow, enhance sag resistance, and contribute to uniform surface texture without significantly compromising gloss retention or clarity.
Q2: Is PARALOID A-21 compatible with common crosslinkers used in thermosetting systems?
A: Yes, PARALOID A-21 exhibits good compatibility with amino resins (e.g., melamine-formaldehyde), isocyanates, and other conventional crosslinkers used in baked and ambient-cure systems. Its acrylic backbone provides stability and minimal interference with cure kinetics under typical formulation conditions.
Q3: How should PARALOID A-21 be incorporated into a coating formulation?
A: It is typically added during the let-down stage, dissolved in compatible solvents such as xylene, toluene, or ketones before blending with other components. Pre-dilution ensures homogeneous dispersion and avoids agglomeration. Avoid high-shear mixing at elevated temperatures to preserve its structural integrity.
Q4: Does PARALOID A-21 offer any benefits for UV stability in outdoor applications?
A: As a non-yellowing acrylic resin with inherent UV resistance, PARALOID A-21 contributes to improved long-term color stability and gloss retention in exterior coatings—particularly when used in conjunction with UV absorbers and HALS stabilizers.
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