New cationic polymer and inkjet recording sheet

A cationic polymer represented by the following general formula (A):

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• wherein X1, X2 and X3 each independently represent a hydrogen atom, or an alkyl group having 1 to 18 carbon atoms or an alkoxy group having 1 to 8 carbon atoms or an aryloxy group, each of which may contain a saturated or unsaturated cyclic structure;
• further, at least one of X1, X2 and X− represents the alkoxy group or the aryloxy group;
• Y represents a bivalent linking group having 1 to 18 carbon atoms, which may have a substituent and may have therein a linking heteroatom;
• B represents at least one recurring unit which can be copolymerized with A;
• m and n represent the mole ratios of the A component and the B component, respectively, where 0.2≦m≦1.0, and 0≦n≦0.8 (m+n=1.0);
• R1 represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms;
• R2, R3 and R4 each independently represent a hydrogen atom, or an alkyl group having 1 to 18 carbon atoms, an aryl group or an aralkyl group, each of which may have a substituent and may be linked to form a saturated or unsaturated cyclic structure;
• Z represents —O— or —NH—;
• Y2 represents a bivalent linking group having 1 to 8 carbon atoms, which may have therein a linking heteroatom;
• and X− represents an anion.