Monobutyltin Oxide

Esterification Catalyst: Accelerates the synthesis of phthalate and adipate plasticizers at high temperatures.
Resin Production: Key catalyst for manufacturing coil coatings, insulating varnishes, and saturated polyester resins.
Polyurethane Synthesis: Employed in the production of high-performance PU elastomers and specialized foams.

MBTO, Butylstannonic Acid, Butyltin Hydroxide Oxide.

CAS: 2273-43-0
EC: 218-880-1
Sectors: Plastics & Polymers, Coatings, Adhesives, Sealants & Elastomers

Monobutyltin Oxide (CAS 2273-43-0) is a Technical Grade organotin catalyst supplied as a white to almost white powder to crystal, used to accelerate esterification and polycondensation reactions in unsaturated polyester resins, alkyd coatings, and plasticizer production. This Technical Grade white powder is valued for its ability to shorten reaction times and improve product yields.

It is indispensable in the production of unsaturated polyester resins and alkyd coatings, where it ensures optimal cross-linking and thermal stability. MBTO remains active throughout the process, providing consistent results in large-scale production.

Additionally, it functions as a critical component in the manufacture of polymeric plasticizers and powder coating resins. Its high purity ensures minimal interference with the color and transparency of the final polymer.

Typical Properties

Molecular formula	C₄H₁₀O₂Sn
Molecular weight	192.83 g/mol
Appearance	White infusible solid. Sol in Me 2 CO.
Form	powder to crystal
Color	White to Almost white
Melting point	210 °C
Boiling point	350 °C
Density	1,46 g/cm 3
Water solubility	317-3200μg/L at 20°C
Grades available	Technical Grade

Typical literature values for identification; lot-specific results are stated on the certificate of analysis (COA) and the safety data sheet (SDS) that accompany every delivery.

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