Mixtures of phenolic and inorganic materials with antimicrobial activity
Plastic films, fibers and articles are provided long-term antimicrobial activity with a combination of certain phenolic and inorganic antimicrobial agents. The plastic films, fibers and articles with antimicrobial activity exhibit superior resistance to discoloration, may be processed at high temperature, and maintain physical properties upon weathering, especially upon exposure to ultraviolet radiation.
1. A plastic composition which comprises
a plastic resin selected from polyamide and acrylonitrile-butadiene-styrene terpolymer and incorporated therein,
a mixture of antimicrobial agents which comprises
a) 2,4,4′-trichloro-2′-hydroxydiphenyl ether and
b) an antibacterial silver-supporting zeolite,
wherein the weight ratio of components a):b) is from 2:1 to 1:1 and
wherein the mixture of a) and b) is present from about 0.05 to about 3% by weight, based on the weight of the polyamide or acrylonitrile-butadiene-styrene terpolymer.
2. A composition according to claim 1 which additionally comprises at least one co-additive selected from the group consisting of antioxidants, ultraviolet light absorbers, hindered amines, phosphites or phosphonites, hydroxylamines, nitrones, benzofuran-2-ones, thiosynergists, polyamide stabilizers, metal stearates, nucleating agents, fillers, reinforcing agents, lubricants, emulsifiers, dyes, pigments, optical brighteners, flame retardants, antistatic agents and blowing agents.
3. A composition according to claim 1 which additionally comprises at least one co-additive selected from the group consisting of the hindered amines.
4. A composition according to claim 1 wherein component b) is a surface-modified antibacterial silver-supporting zeolite.
5. A composition according to claim 1 wherein the weight ratio of components a):b) is 1:1.
6. A composition according to claim 1 wherein the weight ratio of components a):b) is 2:1.
7. A composition according to claim 4 wherein the weight ratio of components a):b) is 1:1.
8. A composition according to claim 4 wherein the weight ratio of components a):b) is 2:1.