Monobutyltin Hydroxychloride

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.

NameMonobutyltin Hydroxychloride
BNT Product NameBNT-CAT 210
SynonymsMonobutyltin hydroxychloride
Butyltin hydroxychloride

Economic Use of Butyltin Hydroxychloride

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.