Patent ID: 8309066

Claim:
Cationic benzoxazine (co)polymer, wherein at least 5% of all the nitrogen atoms, relative to the total number of all the nitrogen atoms in the cationic benzoxazine (co)polymer, are present in the form of permanently quaternary nitrogen atoms, wherein the cationic benzoxazine (co)polymer is produced by providing at least one polymerizable benzoxazine compound; producing a non-cationic benzoxazine (co)polymer by polymerizing the at least one polymerizable benzoxazine compound under suitable polymerization conditions, wherein less than 1% of nitrogen atoms of the non-cationic benzoxazine (co)polymer, relative to the total number of nitrogen atoms in the non-cationic benzoxazine (co)polymer, are present in the form of permanently quaternary nitrogen atoms, and reacting the non-cationic benzoxazine (co)polymer with at least one alkylating agent in an amount wherein at least 5% of all nitrogen atoms, relative to the total number of nitrogen atoms in the non-cationic benzoxazine (co)polymer, are converted into permanently quaternary nitrogen atoms.