Patent ID: 8198341
Filing Date: 2012-06-12
Classification: C07F,C08J,C08K,C08L

Abstract:
1. Hydroxymethylphosphonate produced by the 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 provide the hydroxymethylphosphonate accompanied by acid by-products the total acidity of which is less than about 15 mg KOH/g, 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.