PURPOSE: To obtain an antibacterial resin composition excellent in transparency by melting and mixing a thermoplastic organic polymer compound (A) and an antibacterial agent.
CONSTITUTION: This composition has persistently stable antibacterial properties because of the use of a component A which is hydrophobic and an antibacterial agent which is hardly soluble in water. Examples of component A used include a (co)polymer of a diene monomer, a thermoplastic styrene elastomer and an ethylene/vinyl acetate copolymer, among which one having a low melting point is preferable since it hardly decomposes the antibacterial agent during melting. The term, hydrophobic means that it has a water absorptivity of at most about 1.0wt.% in an atmosphere of 20°C and a relative humidity of 65%. A suitable antibacterial agent is one having a wide antibacterial spectrum, for example, chlorohexidine acetate. The term, hardly soluble in water means that it has a solubility of at most 3.0g in 100g of distilled water at 20°C. The amount of the antibacterial agent contained in the component A is usually 0.01-10.0wt.% though it varies depending on the combination thereof.
YOKOI HIROSHI
SAKAI SHINICHI
ITOTANI SHUZO
ITOI EIICHI
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