| Name | Monobutyltin Oxide |
| CAS | 2273-43-0 |
| Formula | C4H10OSn |
| BNT Product Name | BNT-CAT 200 |
| Synonyms | MBTO Butyltin oxide Butylhydroxostannane Butylhydroxytin oxide Butyloxostannane Butylenestannonic acid |
MBTO as a Catalyst
MBTO is primarily used for the production of polyester resins and alkyd resins, in the catalysis of esterification reactions, transesterification reactions and of polycondensation reactions up to 240 °C. The catalyst is integrated into the final product with no impact on quality. As such, processes with Monobutyltin oxide do not require subsequent neutralization or filtering the catalyst out. This makes for a technically simple application process.
MBTO significantly shortens esterification times – 20% to 25% less reaction time when compared to tin-free catalysts – enabling reaction at lower temperatures, saving energy and increasing the efficiency of both process and plants. Another advantage of Monobutyltin oxide is in reducing undesirable side reactions, such as dehydration or oxidative decomposition of polyhydric alcohols
The catalyst can be modified in advance with other ligands and requires no special handling measures, only the avoidance of excessive moisture. The final product is of higher quality in comparison with lithium-based catalysts – offering improved color properties and less haze formation.
The effectiveness of MBTO catalysts is proven for a number of short, medium and long oil alkyds.
Economic Significance of MBTO
Its catalytic properties make monobutyltin oxide an important raw material for the production of unsaturated polyester resins in a variety of applications, such as powder coatings and coil coatings for coating steel and aluminum sheets; for coatings in plastic mold making; and for foils.
It is used as a binder for lacquers and paints and in oleochemistry for various esterification and transesterification products.