Bacteriostatically treating method
The present invention provides a method for imparting bacteriostatic effect to a textile product by immersing the textile product for 20 minutes or more in an aqueous solution containing a cationic polypeptide at a concentration of 250 ppm or more, which solution has a temperature of 25° C. or more. By bacteriostatically treating a textile product in accordance with such method, the bacteriostatic effect is not reduced and thus retained even after the textile product is washed for a plurality of times.
1. A method for bacteriostatically treating a textile product, comprising the steps of:
preparing an aqueous solution consisting essentially of water and ϵ-polylysine that comprises ≥60 mol % of a basic amino acid as the main component of the ϵ-polylysine, wherein the basic amino acid is lysine and the molecular weight range of the ϵ-polylysine is between 1,000 and 5,000,
wherein the concentration of the ϵ-polylysine in the solution is between 250 ppm and 5,000 ppm,
wherein pH of the solution is ≥7, and
wherein temperature of the solution is ≤120° C.; and
immersing a textile product into the solution for ≥1 hour
wherein the textile product maintains its bacterio static effect for at least 10 washings.
2. The bacteriostatically treating method according to claim 1 , wherein the temperature of the solution is ≤75° C.
3. The bacteriostatically treating method according to claim 1 , wherein the concentration of ϵ-polylysine is ≥2,500 ppm.
4. The bacteriostatically treating method according to claim 1 , wherein the duration of said immersion is ≥2 hours.
5. The bacteriostatically treating method according to claim 1 , wherein weight ratio of the textile product and the ϵ-polylysine aqueous solution is 1:5 to 1:20.
6. The method of claim 1 wherein the solution of ϵ-polylysine consists essentially of a basic amino acid as the main component of the ϵ-polylysine.