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High transparency and excellent UV resistance for long-term optical stability.
Low viscosity in solvent-based systems, enabling easy processing and uniform film formation.
Superior weatherability and gloss retention under outdoor exposure conditions.
Good compatibility with common acrylic monomers and crosslinkers for tailored formulation flexibility.
Consistent batch-to-batch performance supported by stringent quality control standards.
Automotive clearcoats requiring high durability and surface aesthetics.
Industrial maintenance coatings for metal and plastic substrates.
Architectural exterior coatings demanding color retention and chalking resistance.
UV-curable hybrid coating systems where acrylic backbone enhances reactivity and film integrity.
Specialty OEM finishes for electronics housings and consumer appliances.
| Chemical Type | Acrylic copolymer resin |
| Product Form | Liquid, solution in aromatic hydrocarbon solvent |
| Appearance | Clear, colorless to pale yellow liquid |
| Solids Content (wt%) | 50 ± 2% |
| Viscosity (mPa·s, 25°C) | 800–1,200 |
| Acid Value (mg KOH/g) | 8–12 |
| Glass Transition Temperature (Tg) | ~75°C (calculated) |
| Primary Applications | High-performance topcoats and protective clear finishes |
Q1: What is the primary function of LR-7671 in coating formulations?
A: LR-7671 is a specialty acrylic resin designed primarily as a rheology modifier and film-forming aid in water-based industrial coatings. It enhances viscosity stability, improves pigment suspension, and contributes to uniform film formation without significantly affecting gloss or clarity.
Q2: Is LR-7671 compatible with other common acrylic emulsions and crosslinkers?
A: Yes, LR-7671 demonstrates broad compatibility with conventional acrylic, styrene-acrylic, and vinyl acetate-based emulsions. It is also stable in the presence of common ambient-cure crosslinkers such as aziridines and carbodiimides, though compatibility testing under specific formulation conditions is recommended.
Q3: How should LR-7671 be incorporated into a water-based system?
A: LR-7671 is typically added during the let-down stage, after primary emulsion polymerization and pigment grinding. It should be diluted with deionized water prior to slow addition under moderate agitation to ensure homogeneous dispersion and avoid localized thickening.
Q4: Does LR-7671 contribute to final film hardness or chemical resistance?
A: While not a primary film-hardener, LR-7671 supports cohesive strength development through improved particle packing and interfacial adhesion. Its influence on hardness and chemical resistance is formulation-dependent and generally synergistic rather than dominant—optimal performance is achieved when balanced with appropriate binder resins and crosslinkers.
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