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PROCESS FOR CHEMICALLY MODIFYING A POLYMERIC PART IN ORDER TO IMPART FLAME-RETARDANT PROPERTIES THERETO OR TO IMPROVE SAID PROPERTIES INVOLVING A COVALENT REACTION WITH AT LEAST ONE COMPOUND BEARING AN ISOCYANATE GROUP
PROCESS FOR CHEMICALLY MODIFYING A POLYMERIC PART IN ORDER TO IMPART FLAME-RETARDANT PROPERTIES THERETO OR TO IMPROVE SAID PROPERTIES INVOLVING A COVALENT REACTION WITH AT LEAST ONE COMPOUND BEARING AN ISOCYANATE GROUP
The invention relates to a process for chemically modifying a polymeric part in order to impart flame-retardant properties thereto or to improve said properties, said method comprising the following steps: - a step of reacting a polymeric part with at least one polymer comprising, as reactive groups, amine groups and/or hydroxyl groups, with a functional compound, referred to as the first compound, comprising at least one isocyanate group and at least one vinyl-type polymerizable group, wherein the isocyanate groups react in a covalent manner with part or all of the amine groups and/or hydroxyl groups of the at least one polymer, whereby a polymeric part is covalently bonded to residues of the functional compound; - from the vinyl-type polymerizable groups of the residues of the functional compound, a step of polymerizing a second compound comprising at least one vinyl-type polymerizable group and at least one group comprising at least one phosphorus atom, said reaction step and said polymerization step being carried out in the presence of at least one supercritical fluid.
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