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High hydroxyl functionality for excellent crosslinking density with melamine and polyisocyanate curing agents.
Superior weather resistance and UV stability, maintaining gloss and color retention in exterior coatings.
Good compatibility with common solvent-based acrylic and polyester resins, enabling flexible formulation design.
Low viscosity profile facilitating high-solids formulation development and improved application efficiency.
Consistent batch-to-batch reproducibility meeting stringent quality control standards for industrial coating systems.
Automotive OEM topcoats and clearcoats requiring high durability and aesthetic performance.
Industrial maintenance coatings for metal substrates exposed to harsh environmental conditions.
Architectural coil coatings where long-term gloss retention and corrosion resistance are critical.
General-purpose high-performance solventborne baking enamels for appliances and machinery.
Refinish coatings for automotive and heavy-duty equipment repair applications.
| Chemical Type | Hydroxyl-functional acrylic copolymer |
| Product Form | Liquid resin solution |
| Appearance | Clear, pale yellow liquid |
| Solvent System | Xylene / butyl acetate blend |
| Hydroxyl Value (mg KOH/g) | 85–95 |
| Acid Value (mg KOH/g) | < 5 |
| Non-Volatile Content (% by weight) | 50 ± 2 |
| Viscosity (mPa·s, 25°C) | 800–1,200 |
Q1: What is the primary functional role of LR-7664 in coating formulations?
A: LR-7664 is a hydroxyl-functional acrylic resin designed primarily as a reactive binder in two-component polyurethane and melamine-cured systems. Its pendant hydroxyl groups enable covalent crosslinking with isocyanates or amino resins, contributing to enhanced hardness, chemical resistance, and film integrity.
Q2: Is LR-7664 compatible with common solvent-based industrial coating solvents?
A: Yes — LR-7664 exhibits good solubility and stability in typical aromatic and aliphatic hydrocarbon solvents (e.g., xylene, mineral spirits), as well as oxygenated solvents such as butyl acetate and methyl amyl ketone. Compatibility should be verified in final formulation due to potential interactions with other resins or additives.
Q3: How does LR-7664 compare to conventional hydroxyl acrylic resins in terms of cure speed and film flexibility?
A: LR-7664 is engineered to offer a balanced profile: it supports efficient crosslink density development at moderate bake temperatures while retaining useful film flexibility and impact resistance — making it suitable for applications requiring both durability and substrate conformity, such as automotive refinish and industrial metal coatings.
Q4: Can LR-7664 be used in low-VOC or high-solids coating systems?
A: Yes — its molecular architecture allows formulation into medium-to-high solids systems (typically 55–75% NV) without excessive viscosity build. When combined with appropriate reactive diluents or low-VOC solvent blends, it supports VOC reduction strategies while maintaining application performance and crosslink efficiency.
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