Catalyst for Esterification, Transesterification and Polycondensation Reactions
Monobutyltin hydroxychloride is an organotin compound. The amorphous white powder is soluble in alcohols and carboxylic acids when heated. It is used as a catalyst for esterification, transesterification and polycondensation reactions.
The use of monobutyltin hydroxychloride produces consistently good results in the production of trioctyl trimellitate, unsaturated and saturated polyesters and in the production of alkyds. Depending on the specific application, application concentrations are normally between 0.01% and 0.5%. The catalyst can be used in the 90 – 280 °C temperature range.
This organotin catalyst is used in the synthesis of saturated polyester resins for powder coatings. In the production of unsaturated polyester resins, it is used for end applications in gel coatings, sheet molding compounds and in casting processes.
Another field of application is the production of PBT engineering resins for the automotive and construction industries. In economic terms, PBT resins are the second most important polyester worldwide.
In addition to the synthesis of binders and alkyd resins, use also includes antioxidants for which the catalyst is used in transesterification reactions at temperatures between 140 and 180 °C.
Transport and Storage
Monobutyltin hydroxychloride can be shipped in plastic lidded drums. When stored in sealed, original packaging, a minimum shelf life of 6 months is possible without compromising quality.