Method to provide flame retardancy to materials

摘要

The present invention relates to a method of treating a material comprising the following steps: a) contacting a material with at least one phosphorus source, and b) subjecting the material obtained in step a) to a rinsing procedure, wherein the rinsing procedure comprises at least one rinsing step in which said material obtained in step a) is contacted with a nitrogen source, preferably a polymeric nitrogen source, more preferably a cationic polymeric nitrogen source.