Patent ID: 9169278
Filing Date: 2015-10-27
Classification: C07F,C08J,C08K,C08L

Abstract:
1. A polyurethane foam-forming composition comprising a polyol, an isocyanate, a catalyst and a hydroxymethylphosphonate wherein the hydroxymethylphosphonate is produced by a method comprising heating paraformaldehyde in a solvent to a desired reaction temperature, wherein the solvent is present in at least an amount necessary to solvate or suspend the paraformaldehyde; adding at least one alkyl phosphite to the heated paraformaldehyde, to provide hydroxymethylphosphonate, the alkyl phosphite being added to the heated paraformaldehyde at a rate which will avoid or inhibit the production of acid by-product(s) in an amount of greater than about 1 percent by weight, there being present in the reaction medium at least one hindered amine catalyst; and, optionally, following the completion of the addition, heating the reaction mixture to an elevated temperature.