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High molecular weight aliphatic polyester resin offering excellent flexibility and impact resistance.
Low viscosity enables easy processing and improved formulation compatibility with isocyanates and other crosslinkers.
Hydrolysis-resistant structure ensures enhanced durability in humid or outdoor exposure conditions.
Designed for 2K polyurethane coatings requiring balanced hardness, elasticity, and weathering performance.
Free of aromatic monomers — supports low-yellowing and superior UV stability in clear and pigmented systems.
Automotive refinish clearcoats and basecoats requiring high gloss and chip resistance.
Industrial maintenance coatings for metal substrates exposed to harsh environmental conditions.
High-performance wood coatings where flexibility and adhesion to complex contours are critical.
Plastic coatings for automotive interior trim and consumer electronics housings.
UV-curable hybrid polyurethane-polyester topcoats for decorative and protective finishes.
| Chemical Type | Aliphatic polyester polyol |
| Product Form | Liquid |
| Appearance | Clear, pale yellow liquid |
| Hydroxyl Value (mg KOH/g) | 50–56 |
| Acid Value (mg KOH/g) | < 2.0 |
| Viscosity at 25°C (mPa·s) | 3,500–4,500 |
| Water Content (wt. %) | < 0.10 |
| Primary Applications | 2K polyurethane topcoats for automotive, industrial, and wood applications |
Q1: What is the primary function of Desmophen RD181X in polyester-based coating and adhesive formulations?
A: Desmophen RD181X is a reactive polyester resin designed to serve as a crosslinker or reactive diluent, enhancing flexibility, impact resistance, and adhesion while maintaining good compatibility with unsaturated polyester and acrylic systems.
Q2: Is Desmophen RD181X suitable for UV-curable systems?
A: Yes, RD181X contains hydroxyl functionality and is compatible with UV-curable polyester-acrylate hybrid systems, where it contributes to improved film formation and mechanical performance without significantly inhibiting cure kinetics.
Q3: How does RD181X compare to conventional alkyd resins in terms of drying behavior and solvent demand?
A: RD181X typically offers faster through-dry and reduced solvent retention compared to traditional alkyds due to its lower molecular weight and tailored polyester architecture, supporting formulations with lower VOC content.
Q4: Can RD181X be used in high-solids polyester coatings?
A: Yes — its low viscosity and excellent solubility in common organic solvents make RD181X well-suited for high-solids polyester coating systems, helping maintain application properties while increasing solids content.
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E-mail: wangxingqiang@ericwchem.com
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