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High transparency and excellent UV resistance for long-term optical stability.
Outstanding weatherability and color retention in outdoor exposure conditions.
Good solubility in common organic solvents including esters, ketones, and aromatic hydrocarbons.
Low yellowing tendency and high clarity retention after thermal aging.
Consistent molecular weight distribution enabling predictable film formation and rheology.
High-performance automotive clearcoats and topcoats.
Architectural and industrial maintenance coatings requiring durability.
Plastic coatings for exterior automotive trim and signage.
UV-curable hybrid coating systems as a reactive binder component.
Clear protective overprint varnishes for metal and plastic substrates.
| Chemical Type | Acrylic copolymer resin |
| Product Form | Solution in toluene/xylene blend |
| Appearance | Clear, pale yellow liquid |
| Non-Volatile Content (wt%) | 50 ± 2% |
| Viscosity (25°C, mPa·s) | 800–1,200 (Brookfield RVT, spindle #3, 20 rpm) |
| Gardner Color | ≤ 3 |
| Acid Value (mg KOH/g) | ≤ 5 |
| Primary Applications | High-durability clearcoats, protective topcoats, UV-resistant finishes |
Q1: What is the primary function of LR-7697 in coating formulations?
A: LR-7697 is a specialty acrylic resin designed primarily as a rheology modifier and film-forming aid in solvent-based and high-solids industrial coatings. It enhances sag resistance, improves leveling, and contributes to robust dry-film integrity without significantly compromising pot life.
Q2: Is LR-7697 compatible with common crosslinkers used in thermosetting systems?
A: Yes, LR-7697 demonstrates good compatibility with standard amino resins (e.g., melamine-formaldehyde) and polyisocyanate curing agents in baked and ambient-cure systems. Its molecular design minimizes gelation risk during storage and processing when formulated within recommended pH and solvent polarity ranges.
Q3: How should LR-7697 be incorporated into a formulation to ensure optimal performance?
A: LR-7697 is typically added during the let-down or post-addition stage under moderate agitation. Pre-dilution in a compatible solvent (e.g., xylene, Solvesso™ 100, or ester blends) is recommended to ensure uniform dispersion. Avoid high-shear mixing at elevated temperatures prior to full dilution, as this may affect viscosity development.
Q4: Does LR-7697 offer any specific advantages for high-gloss or metallic effect coatings?
A: Yes — its low intrinsic haze and excellent clarity support high-gloss appearance and enhance flake orientation in metallic and pearlescent systems. It also helps suppress orange peel and maintains pigment suspension stability during storage without interfering with orienting additives.
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E-mail: wangxingqiang@ericwchem.com
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