Abstract
Dimethylaminomethylphosphine oxide (DMAO) is prepared by the Gabriel method from dimethylchloromethylphosphine oxide. Adding to DMAO, ethylene or propylene oxides affords dimethyl-N,N-bis(2-hydroxyethyl)aminomethylphosphine oxide (DMEO) and dimethyl-N,N-bis(2-hydroxypropyl)aminomethylphosphine oxide (DMPO). It is found that DMEO and DMPO can be employed as reactive flame retardants for reducing the combustibility of rigid polyurethane foams without impairing their physical and mechanical properties.
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