Abstract: A method of preparing polymer lattices of homogeneous interpenetrated structure, starting from a mixture of at least two basic prepolymer constituents is characterized by the fact that a microwave radiation is applied having a frequency spectrum chosen in order that it interacts preferentially with the first prepolymer and a power density chosen in order that it directly activates the exothermic reaction of cross-linking of the first prepolymer. The cross-linking of the second prepolymer is only triggered under the combined action of the heat due to the interaction of the microwave energy with the second prepolymer and the heat introduced by the cross-linking reaction of the first prepolymer, which makes it possible to combine propagation of the two cross-linking reactions at similar speeds.