Borates with cations selected from the group of onium or organometallic complexes, as cationic polymerisation initiators

摘要

New onium borates of an element of Groups 15 to 17 of the Periodic Classification [Chem.& Eng. News, vol 63, No. 5, 26 of 4 February 1985] or new borates of an organometallic complex of an element of Groups 4 to 10 of the Periodic Classification (same reference), the anionic borate entity of which has the formula [BXaRb] in which formula: - a and b are integers ranging from 0 to 4 with a + b = 4 - the symbols X represent . a halogen (chlorine, fluorine) atom with a = 0 to 3 . an OH functional group with a = 0 to 2 - the symbols R are identical or different and represent . an aryl radical substituted by at least one electron-withdrawing group or by at least two halogen atoms, when the cationic entity is an onium . an aryl radical substituted by at least one halogen atom or one electron-withdrawing group, when the cationic entity is an organometallic complex. They can be used as cationic polymerization initiators.