Antibacterial polymer composition

An antibacterial polymer composition comprising:

• a hydrophilic polymer;
• an antibacterial polymer that is a copolymer containing a repeating unit represented by Chemical Formula 1and a repeating unit represented by Chemical Formula 2;
• and
• a solvent containing water,
• wherein the antibacterial polymer composition has a viscosity under a constant temperature/humidity condition (23° C., 50% relative humidity) of 1,500 cP to 3,000 cP as measured using a Brookfield DV2T LV TJ0 viscometer with V-75 spindle at 200 rpm,
• wherein the antibacterial polymer composition has a bacterial growth inhibition rate against Proteus mirabilis of 60% or more as calculated by Equation 1:
• Bacterial
• ⁢
• growth
• ⁢
• inhibition
• ⁢
• rate
• ⁢
• (
• %
• )
• =
• (
• 1
• -
• A
• S
• A
• 0
• )
• ×
• 100
• [
• Equation
• ⁢
• 1
• ]
• wherein, As is an absorbance of an experimental group at 600 nm wavelength of Proteus mirabilis culture medium to which a sample is added, and A0 is an absorbance of a control group at 600 nm wavelength of the Proteus mirabilis culture medium to which the sample is not added,
• the experimental group is prepared by:
• applying the antibacterial polymer composition onto a release-treated PET film substrate so as to have a thickness of 200 μm using a bar coater, and then drying at 80° C. for 240 minutes to prepare an antibacterial film having a coating layer formed on one side of the substrate, and
• transferring 25 ml of broth type medium inoculated with Proteus Mirabilis at 3300 CFU/ml to a 50 mL conical tube, to which 0.1 g of the antibacterial film prepared is cut and added with alcohol-sterilized scissors, vortexing, and incubating in a shaking incubator at 37° C. for 16 hours, and
• the control group is prepared by culturing Proteus Mirabilis at 37° C. for 16 hours:
• in Chemical Formula 1,
• L is an alkylene having 1 to 10 carbon atoms,
• R1 to R3 are each independently hydrogen or methyl;
• one of R4 to R6 is an alkyl having 5 to 20 carbon atoms, and the rest of R4 to R6 are each independently an alkyl having 1 to 4 carbon atoms,
• X is halogen, and
• n is an integer of 10 to 10,000,
• in Chemical Formula 2,
• R′1 to R′3 are each independently hydrogen or methyl, and
• m is an integer of 1 or more.