Composition for one-component polyurethane foams

摘要

The present invention concerns a one component foam (OCF) composition comprising a very low amount of free monomeric MDI. The present OCF composition may be obtained without any free MDI removal step, and without the addition of extra solvent to compensate for the substantially lower amount of free MDI, compared with traditional compositions. The present composition comprises a source of free NCO of functionality of at least 2.6, at least a specific mono-functional alcohol, a bi-functional alcohol, and a tri-or higher functional alcohol, all polyols being characterized by a rather low molecular weight. The OCF composition of the present invention is suitable for being dispensed from a pressurized can with a blowing agent.