Polyurethane curatives
A class of alkanol amine ligands reacted with bismuth carboxylates lends unique curability properties to isocyanate and polyols for production of polyurethane for CASE applications, including growing demand for polyurethane spray-foam. The amino-alcohol ligand, when associated with bismuth neodecanoate, offers improved moisture and solvent resistance during B-side (polyol) storage, cure rates analogous to tin-based curatives, and overall good final physical properties of the cured polyurethane.
1. A spray-foam polyurethane catalyst produced by the reaction between a bismuth carboxylate with an alkanolamine and a polyol, wherein polyol is selected from polyethylene glycols, polypropylene glycols and polybutylene ether glycols, wherein the bismuth carboxylate is bismuth neodecanoate, and wherein the alkanolamine is tetrakis(2-hydroxyethyl)ethylenediamine.
2. A polyurethane catalyst produced by the reaction between a bismuth carboxylate with an alkanolamine and a polyol, wherein polyol is selected from polyethylene glycols, polypropylene glycols and polybutylene ether glycols, wherein the bismuth carboxylate is bismuth neodecanoate, and wherein the alkanolamine is ethylenedinitrilo-tetra-2-propanol.