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High hydroxyl functionality for excellent crosslinking density with melamine and polyisocyanate curing agents.
Superior weatherability and UV resistance, ensuring long-term gloss retention and color stability.
Optimized molecular weight distribution for balanced viscosity, film formation, and solvent release.
Excellent compatibility with common acrylic and polyester resins used in high-performance coatings.
Low volatile organic compound (VOC) formulation support, facilitating compliance with stringent environmental regulations.
Automotive OEM topcoats and clearcoats.
Industrial maintenance coatings for metal substrates.
Architectural high-gloss exterior finishes.
Plastic coatings requiring adhesion, flexibility, and chemical resistance.
Powder coating hybrid systems (liquid-assisted or hybrid binder applications).
| Chemical Type | Hydroxyl-functional acrylic copolymer |
| Product Form | Liquid resin solution |
| Appearance | Clear, pale yellow to colorless liquid |
| Hydroxyl Value (mg KOH/g) | 65–75 |
| Acid Value (mg KOH/g) | < 5 |
| Solids Content (% by weight) | 50 ± 2 (in xylene/butyl acetate blend) |
| Viscosity (mPa·s at 25°C) | 3,000–5,000 (Brookfield RVT, spindle #3, 20 rpm) |
| Primary Applications | Thermosetting automotive and industrial coatings |
Q1: What is the primary function of OLESTER Q850 in coating formulations?
A: OLESTER Q850 serves as a hydroxyl-functional acrylic resin that acts as a reactive binder in two-component polyurethane and melamine-cured systems. It contributes to film formation, enhances crosslink density, and supports improvements in hardness, chemical resistance, and gloss retention.
Q2: Is OLESTER Q850 compatible with common solvent-based and high-solids coating systems?
A: Yes, OLESTER Q850 exhibits good solubility in typical organic solvents such as xylene, toluene, and esters, and is widely used in medium-to-high solids solventborne industrial coatings. Its molecular design supports compatibility with other acrylic resins, alkyds, and crosslinkers without significant risk of phase separation or gelling under standard formulation conditions.
Q3: How does OLESTER Q850 perform in terms of weathering and UV stability?
A: As a purely acrylic hydroxyl resin with no aromatic backbone, OLESTER Q850 offers inherently superior UV resistance and long-term color stability compared to aromatic polyester or epoxy-modified alternatives. It is commonly selected for exterior applications where gloss retention and minimal chalking are critical performance requirements.
Q4: Can OLESTER Q850 be used in low-VOC or water-reducible formulations?
A: While OLESTER Q850 is designed for solventborne systems, it can be incorporated into water-reducible formulations via solvent exchange or emulsification techniques—typically with co-solvents and surfactants. However, direct water dispersion is not recommended without formulation optimization and compatibility testing.
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