StructureMono-butyl tin oxide (MBTO)
CAS No. 2273-43-0
EC No. 218-880-1
Synonyms Butylhydroxyoxo-stannane; n-Butyltin hydroxide oxide; 1-Butanestannonic acid; Butylhydroxyoxostannane; butyl-hydroxy-oxotin; Butylhydroxytin oxide; Butylstannonic acid; Butyltin hydroxide oxide; Mono-N-butyltin oxide

Mono-butyl tin oxide (MBTO)

​Mono Butyl Tin Oxide (MBTO) is an amorphous white solid phase transfer catalysts. MBTO is hydrolytically stable and can be used in the synthesis of saturated polyester resins for powder coatings and coil coatings, as well in the production of unsaturated polyester resins for gel-coat, sheet molding, and cast molding applications. It might be used also to produce polymeric plasticizers.

MBTO is used primarily to catalyze esterification and polycondensation reactions at temperature between 210°C and 240°C (stable up to 250°C). MBTO begins to solubilize in carboxylic acid at 80°C during the reaction and becomes incorporated into the final product without affecting the quality of the product. For this reason MBTO does not require neutralization or filtration at the end of production.

MBTO can significantly shorten esterification times, offers energy savings due to lower reaction temperatures, with a consequent more efficient use of equipment. MBTO minimizes side reactions such as dehydration and oxidative degradation of polyhydric alcohols, especially secondary alcohols. MBTO can be charged up front with other reactants, and requires no special handling other than avoiding excessive exposure to moisture.

Shelf Life

Under proper storage conditions, the shelf life is 12 months

Health & Safety

Detailed information on the product described can be found in our relevant Health and Safety Information (Material Safety Data Sheet)