TIB KAT 721 P

TIB KAT 721 P is a proprietary, liquid catalyst based on bismuth.

TIB KAT 721 P is unique in that it is both non-carboxylate and water soluble, which differentiates it from the more common bismuth carboxylates, such as TIB KAT 716 (bismuth neodecanoate) and TIB KAT 728 (bismuth octoate). TIB KAT 721 P is provided as a 50% active bismuth catalyst in 50% PEG. It can be used for curing solvent borne polyurethane formulations Like most bismuth-based products, TIB KAT 721 P 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.

TIB KAT 721 P is used in applications where toxicity (when compared with organotins), water solubility, and shelf-life issues are primary priorities. Although TIB KAT 721 P has a different chemical makeup compared to the traditional bismuth carboxylates, it does exhibit a similar bismuth-like reactivity profile. One of the benefits this product brings is that the use of TIB KAT 721 P 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 ligand characteristics. Thus, a balanced front-end/pot-life and back-end/final cure reactivity profile can be achieved. Reactivity, especially in regard to back-end cure, is greatly improved with the addition of added and exothermically generated heat. Typical of the bismuth catalysts in general, TIB KAT 721 P will catalyze most polyurethane reactions, and is somewhat similar in reactivity to tin-based catalysts; it is primarily selective toward the polyol-isocyanate and water-isocyanate reactions. In addition to its enhanced water stability, TIB KAT 721 P will impart a longer polyol-side shelf-life compared to bismuth carboxylates.