REAXIS® C3208 (Bismuth Neodecanoate) is one the most commonly used specialty metal-based catalysts for polyurethanes. With a long history of usage in a wide range of formulations, Bismuth Neodecanoate is a good benchmark catalyst when either starting development work on new formulations or looking at using lower-toxicity alternatives to organotins. REAXIS® C3208 has a higher bismuth metal concentration and lower free acid content compared to REAXIS® C716. REAXIS® C3208 is supplied with excess free neodecanoic acid to control viscosity. It can be supplied with a wide range of non-acid diluents including mineral oils, polyols, and esters. Similar products include REAXIS® C716 and REAXIS® C716LV.
|Bismuth Content (%)||18.5 - 20.5|
|Color (Gardner Number)||5 Max|
|Density (g/ml)||1.1 - 1.2|
Like most bismuth carboxylates, REAXIS® C3208 is commonly used in polyurethane applications. It is used in a wide range of polyurethane applications including coatings, adhesives and sealants, elastomers, foams, and plastics. REAXIS® C3208 is used in applications where toxicity concerns are paramount. In addition to use as a polyurethane catalyst, bismuth neodecanoate can be used in lubricant formulations.
Use of REAXIS® C3208 as a polyurethane catalyst results in good overall reactivity. A well-balanced cure is achievable given the presence of both a low bismuth metal content and large ligand. Thus, a balanced front-end/pot-life and back-end/ final cure reactivity profile can be achieved. Bismuth Neodecanoate’s reactivity, especially in regard to back-end cure, is greatly improved with the addition of added and exothermically generated heat. Typical of the bismuth carboxylate family of catalysts, REAXIS® C3208 will catalyze most polyurethanes reactions and is somewhat similar in reactivity to tin-based catalysts; it is primarily selective toward the polyol-isocyanate and water-isocyanate reactions. REAXIS® C3208 is hydrolytically stable within typical formulation moisture levels, but this stability will break down with increasing moisture content. In general bismuth carboxylates exhibit a lower hydrolytic stability compared to organotins.
REAXIS® C3208 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 Bismuth Carboxylates, the primary cause of instability would be hydrolysis.