Crosslinked polymer, method for manufacturing it and use thereof

A crosslinked polymer having a tertiary amine and/or a quaternary ammonium salt structure, said crosslinked polymer has a tertiary amine structure at either end of at least one crosslink structure and essentially has a crosslink structure represented by the following general formula (1):

• wherein R1, R2, R3 and R4 are the same or different and each represents a hydrogen atom, a halogen atom, an alkyl group containing 1 to 10 carbon atoms, or a hydroxyl group;
• R5, R6, R7 and R8 are the same or different and each represents a hydrogen atom, a halogen atom, a methyl group, or an ethyl group;
• a and b are the same or different and each represents an integer of 0 to 10;
• and p represents 0 or 1;
• with the proviso that the relation a+b+p≧1 is satisfied;
• Z represents an —NH—, —N (CH3)—, 1, 4-piperazinylene, —NH—(CH2) 3—NH—, —NH—(CH2) 4—NH—, —O—, —O—(CH2) 2—O—, —O—CH2—C (CH3) 2—CH2—O—, —O—(CH2) 2−—(O—CH2 —CH2)n1—O—, 3-methyl-2, 6-pyridyl, 4-methyl-2, 6-pyridyl, 2, 6-pyridyl, 2, 5-pyridyl, or —CH (OH) —:
• n1 represents an integer of not less than 0.