Patent ID: 8530556

Claim:
Antibacterial cosmetic brush hairs produced by surface-treating synthetic fibers with an antibacterial agent consisting of quaternary ammonium salt and phenolic compound, and acid, said antibacterial cosmetic brush hairs having long-lasting antibacterial activity such that the antibacterial cosmetic brush hairs can maintain antibacterial activity after being washed five times, each washing consisting of rubbing with hands 100 times, said phenolic compound being one or more compounds selected from the group consisting of hydroxybenzoic acid, p-hydroxybenzoate methyl, p-hydroxybenzoate ethyl, p-hydroxybenzoate propyl, p-hydroxybenzoate isobutyl, p-hydroxybenzoate butyl, phenoxy ethanol, p-aminosalicylic acid, thymol, o-chlorothymol, 4-chloro-m-cresol, p-chlorometaxylenol, dichloro-m-xylenol, chlorophenesin, p-chlorophenol, o-phenyl phenol, 4-chloro-m-cresol, 2,2-thiobis (4-chlorophenol), fenticlor, hexachlorophene, and cross amide.