Antibacterial San Resin, Preparation Method Therefor, and Antibacterial ABS Resin Composition Containing Same

A method of preparing an antibacterial styrene-acrylonitrile (SAN) resin, the method comprising polymerizing a monomer represented by Chemical Formula 1;

• a styrene-based monomer;
• and an acrylonitrile-based monomer in the presence of a polymerization initiator at a temperature of 60° C. to 90° C. for 3 hours to 8 hours:
• in Chemical Formula 1,
• R1 to R3 are each independently hydrogen, or an alkyl having 1 to 4 carbon atoms, and
• A is an aromatic ring having 6 to 60 carbon atoms which is unsubstituted or substituted with one or more substituents selected from an alkyl having 1 to 10 carbon atoms, an alkoxy having 1 to 10 carbon atoms, deuterium, halogen, a hydroxy group, or a carboxyl group.