RAPID CURING POLYURETHANE COMPOSITION USEFUL AS A COATING OR SEALANT

摘要

RAPID CURING POLYURETHANE COMPOSITION USEFUL AS A COATING OR SEALANT A storage-stable, rapid curing one-component polyurethane composition useful as a sealant or coating is made with an isocyanate prepolymer having an isocyanate group content of from about 4 to about 6% and a molecular weight of from about 1400 to about 2100, an oxazolidine and optionally a catalyst. The prepolymer used is the reaction product of toluene diisocyanate, a polytetramethylene ether glycol having a molecular weight of from about 500 to about 1500 and a diol having a molecular weight of from about 50 to about 200. This composition is useful as a coating or sealant for porous substrates, particularly wood-based products such as wood composites and flake board.