Patent ID: 6737526
Filing Date: 2004-05-18
Classification: C07D,C07F

Abstract:
A method for preparing a melamine salt of bis-(pentaerythritol phosphate) phosphoric acid by a mechanochemical synthesis, which comprises the following steps: (a) ball milling a mixture comprising P2O5, pentaerythritol, an alkyl benzene having one or two C1-C5 alkyl groups, and a metal halide catalyst in a ball mill reactor at a temperature of room temperature to 150Â° C. to form bis-(pentaerythritol phosphate) phosphoric acid; and (b) ball milling or mechanically mixing a mixture comprising melamine, bis-(pentaerythritol phosphate) phosphoric acid and a solvent at room temperature to 100Â° C., wherein said solvent is water, acetonitrile, or a mixture of the solvent in step (a) with acetonitrile.