Anionic polymerization initiators based on alkali metal amides in combination with alkali metal salts and anionic polymerization process using these initiators

摘要

The invention relates to an anionic polymerization process using an initiator based on an alkali metal amide in combination with an alkali metal salt, as well as to the polymers obtained by this process. P PThe polymerization process according to the invention is characterized in that an initiator is used which results from the combination of an alkali metal amide selected from the group comprising sodium amide, potassium amide or lithium amide and an alkali metal salt of which the cation is selected from the group comprising potassium, lithium or sodium, the anion being selected from the group comprising the thiocyanate, nitrite, cyanide and cyanate anions.PPThese initiators make it possible to carry out the anionic polymerization or vinyl, heterocyclic and diene monomers in order to obtain special polymers or widely used polymers, with great adaptability and under advantageous economic conditions.