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Highly efficient tin-free catalyst for ambient- and heat-cure polyurethane systems.
Excellent shelf stability in two-component PU formulations with reduced risk of premature gelation.
Enables precise control over pot life and cure profile without compromising final film hardness or chemical resistance.
Low volatility and favorable toxicological profile compared to traditional dibutyltin dilaurate (DBTDL).
Compatible with a broad range of polyols, isocyanates, and additives including moisture-sensitive components.
Two-component polyurethane coatings for industrial maintenance and protective applications.
High-performance adhesives and sealants requiring controlled reactivity and long working time.
Automotive refinish and OEM clearcoats where consistent gloss, DOI, and low VOC are critical.
Wood finishing systems demanding fast through-cure and excellent substrate adhesion.
Electronics encapsulation resins requiring reliable crosslinking under mild thermal conditions.
| Chemical Type | Organometallic complex (non-tin, bismuth-based) |
| Product Form | Liquid |
| Appearance | Clear, pale yellow to amber liquid |
| Density (20 °C) | Approx. 1.25–1.30 g/cm³ |
| Viscosity (25 °C) | Approx. 150–300 mPa·s |
| Solubility | Miscible with common organic solvents (e.g., xylene, acetone, MEK) and polyols |
| Primary Applications | PU coatings, adhesives, sealants, elastomers |
| Storage Conditions | Store in original sealed container at 5–30 °C; protect from moisture and direct sunlight |
Q1: What is the primary function of Kat 244 in coating and adhesive formulations?
A: Kat 244 is a highly efficient crosslinker catalyst designed to accelerate the curing reaction between hydroxyl-functional resins (e.g., polyesters, acrylics) and melamine or urea-formaldehyde crosslinkers, enabling faster through-cure, improved hardness development, and enhanced chemical resistance at lower baking temperatures.
Q2: Is Kat 244 compatible with acid-sensitive resin systems?
A: Yes — Kat 244 is a neutral, non-acidic catalyst, making it particularly suitable for formulations containing acid-labile components such as certain alkyds, epoxy esters, or pigments that degrade under acidic conditions. It avoids premature gelation or viscosity instability often associated with strong Brønsted acid catalysts.
Q3: How does Kat 244 compare to traditional p-toluenesulfonic acid (pTSA) catalysts in terms of storage stability?
A: Kat 244 offers significantly improved shelf life and formulation stability compared to volatile or hygroscopic acid catalysts like pTSA. Its neutral, non-volatile nature minimizes post-addition reactivity drift, supporting longer pot life and consistent performance during storage and application.
Q4: What is the typical dosage range for Kat 244 in industrial coatings?
A: Kat 244 is typically used at low concentrations — generally ranging from 0.1% to 2.0% by weight relative to total resin solids — depending on the desired cure speed, film thickness, and thermal profile. Optimal dosage should be determined empirically for each specific formulation and process condition.
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E-mail: wangxingqiang@ericwchem.com
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