REAXIS® C317, also known as Dibutyltin bis-2-ethylhexyl maleate, Dibutyltin-bis-ethylhexylmaleate or Dibutyltin bis-(2-ethylhexylmaleate), is a member of the dialkyl family of organotins. As a dibutyltin carboxylate with a unique ligand, REAXIS® C317 is characterized by moderate reactivity compared to other more common dibutyltin-based products. REAXIS® C317 is primarily used as a Lewis Acid-based homogeneous catalyst in a wide range of silicone (condensation reactions) and polyurethane applications. Similar products would include, REAXIS® C218 (Dibutyltin Dilaurate), REAXIS® C221 (Dibutyltin Dineodecanoate) and REAXIS® C233 (Dibutyltin Diacetate). The dioctyltin analogue of REAXIS® C317 would be REAXIS® C314.
For more information, we invite you to read our technical bulletins on Iron Catalysts for Urethane Chemistries and Strategies for Improving Back-End Reactivity of Bismuth Carboxylate Catalysts.
|Tin Content (%)
|Color (Gardner Number)
|Viscosity (cP @ 20°C)
|1.10 - 1.18
REAXIS® C317 and its alternatives can be used as homogenous catalysts in a wide spectrum of silicone and polyurethane applications including adhesives, sealants, coatings, plastics, and foams. Silicone-based applications include: acetoxy-, ethoxy- and oxime-based Room Temperature Vulcanizing (RTV) adhesives and sealants, polyethylene crosslinked silanes (PEX), and select silane modified polymers (SMPs). As a polyurethane catalyst, REAXIS® C317 is a suitable catalyst for a wide range of aromatic isocyanate-based formulations, specifically those used in adhesives, sealants, and elastomers. REAXIS® C317 is present on most international regulatory lists including US TSCA and Canada DSL.
As a dibutyltin with large ligand, the reactivity of REAXIS® C317 is best characterized as balanced, with moderate front and back-end reactivity compared to more common dibutyltin catalysts such as REAXIS® C218 (DBTL) and REAXIS® C233 (DBTDA). This reactivity is evidenced in most polyurethane and silicone applications. REAXIS® C317 is a good catalyst for applications requiring moderate front -end reactivities/ or a gradual cure such coatings, adhesives, & sealants, and elastomers. In regard to silicone reactions, REAXIS® C317 will catalyze the silanol/silane condensation reaction, thus acting as both a polymerization and crosslinking catalyst. As a polyurethane catalyst, REAXIS® C317 will catalyze the isocyanate-polyol reaction more selectively compared to catalysis of the water reaction. Thus, in polyurethane REAXIS® C317 acts as a polymerization/gelation catalyst. To a limited extent, reactivity can be controlled by adjusting dosing concentration.
REAXIS® C317 should be stored in the original packaging at moderate temperatures and kept from freezing. The container should be closed tightly after each use to maximize shelf life. Characteristic of most Sn (IV) organotins, the primary cause of instability would be hydrolysis. Hydrolysis results the formation of tin oxide insolubles leading to deactivation of REAXIS® C317.